See the instructions within the documentation for more details on performing this analysis. Screw size doesn’t necessarily determine strength. The Buildex Division-Illinois Tool Works, inc. carried out a total of 141 tests on some of the more common types and sizes of screws and sheet materials. Material strength for threaded fasteners and headed industrial fasteners from Elgin Fasteners Group is listed below by grade, type and class and separated into 60,000 psi, 75,000 psi and 120,000 psi. Allowable withdrawal load or force of a common wood screw into side grain perpendicular to the fibers of seasoned dry wood can be expressed as. Capacities based on the AISI S100 Specification Sections E2.4 for fillet welds and E2.5 for flare groove welds. ), Bearing Area Stress Equation for Plate and Bolt or Pin, Where: 1 outer row ! Wood Screw Minimum Spacing. Program to calculate the thread stripping strength, shear strength of the thread in tapped holes, minimum thread engagement. Wood-to-wood, wood-to-concrete, and wood-to-steel connections are possible. The nominal strength of the screw Pns shall be determined by test according to section F1 (a) of 2001 edition of the AISI Specification. 2.1.0 Released on February 21, 2018. Beam Moment and Shear Force Calculator. 1. American Wood Council. The second number in the Designation represents its 'Proof Stress (sp) / Tensile Strength (st)' (% x 10). If a lag screw with a 5/16-inch shaft is installed correctly, it can withstand pull-out, or withdrawal, of up to 212 pounds in close-grain hem, fir and redwood, and up to 266 pounds in larch Douglas fir, according to information from the American Wood Council. The geometry of the screw thread also plays a role. { Rafter Spacing, Center to Center, OC (inches). ©2020 Think Wood. It will also tell you what length screw works best for your wood thicknesses. Tabulated lateral design values for wood screws in Tables 11.3A and 11.3B apply to screws with specified strength properties. Resilient Channel Spacing: Note that all of the lab test data with RC is based on 24″ on center. The following formulas may be used to calculate uniform loads based on planar shear (V s): Single span: Two-span condition: Three-span condition: where: w s = uniform load based on shear strength (psf) V s = Planar Shear Capacity, F s(IB/Q) in (lb./ft.) Calculate wood bearing strength, F e, at any angle to grain (for fastener dia. Mechanical calculator to calculate the shear area of the external thread (Screw or Fastener) which depends upon minor diameter of the tapped hole. When a paper is cut with scissors, the paper fails in shear. >50% of the expected strength is rarely achievable from machined screw threads. Engineering Forum | Contact | Privacy Policy, Home A standard test protocol does not exist for determining the strength ofa screw. wood, and in the other it was perpendicular to the grain. The existence of this shear stress can be seen as cards slide past each other slightly when you bend a deck of cards. We use these equations along with the boundary conditions and loads for our beams to derive closed-form solutions to the beam configurations shown on this page (simply supported and cantilver beams). Michael Blann/Digital Vision/Getty Images. Engineering News π = pi or (3.14157) Pin, Dowel Design Length Shear Stress and Contact Pressure Check Equations and Calculator. Suitable lubrication will normally result in a friction coefficient between 0.1 and 0.3 dependent upon the lubricant used and the materials from which the threads are manufactured. The pull-out strength of a wood screw is going to be more dependent on the wood into which it is installed than on the material of the screw. if (document.getElementById("tester") != undefined) Note: "Cheap" screws therefore aren't what you need to worry about, instead, focus on the screw size. The beam calculator uses these equations to generate bending moment, shear force, slope and defelction diagrams. Where bolt integrity is vital (e.g. A test standard has been developed. ; Screw Thread Strength Calculator - Technical Help. 8 wood screws Lag Screw or Bolt 5. , ring- or screw-shank) nails are required. Disclaimer Minor bug fixes. They are either produced with cut thread screws, which have a tapered shank, or rolled thread screws, which have a constant shank diameter. 2.3.1. 2 or 24 inches. else Online Books & Manuals Shear stress involves the application of stress from two opposite directions causing portions of an object to move in parallel but opposite directions. Bending can induce both a normal stress and a transverse shear stress. If a tensile strength is specified, but a shear strength is not, the shear strength can be approximated as 2/3rds the tensile strength. 2. Bolt or Pin In Single Shear Equation and Calculator. pipeline flanges) bolt-tensioning equipment is normally used, eliminating torsion. 2.0.1 Released on August 29, 2017. Shear Pin/Screw Calculations: Resources : Rocketry Home : Feretich Home : At times it is necessary to use shear pins to hold a rocket intact until a predetermined event occurs to separate the rocket sections. per inch of wood under head Takes into account fastener and wood interaction Online calculators and converters have been developed to make calculations easy, these calculators are great tools for mathematical, algebraic, numbers, engineering, physics problems. { Designations (low alloy steels): B5 (80,000psi), B7 (≤2½ins:105,000psi & ≤4ins:95,000psi & ≤7ins:75,000psi), Designations (high alloy steels): B6 (85,000psi), B8 (30,000psi), Designations (Nickel alloy steels): B (≤¾in:115,000psi & ≤3½ins:110,000psi), External (bolts); Close fit = 4g, Medium fit = 6g, Free fit = 8g, Internal (nuts); Close fit = 5H, Medium fit = 6H, Free fit = 7H, External (bolts); Close fit = 3A, Medium fit = 2A, Free fit = 1A, Internal (nuts); Close fit = 3B, Medium fit = 2B, Free fit = 1B. Use this beam span calculator to determine the reactions at the supports, draw the shear and moment diagram for the beam and calculate the deflection of a steel or wood beam. Lead Screw Torque and Force Calculator. How to calculate wood beam strength. However researchers have questioned … Design Strength Properties Design Shear Strength Approx. stress in the screw at the root diameter is required to - be checked when designing the connection for with- drawal loads (see 11.2.3 of the Specification). When the bolt is subjected to shear load, also use a dowel pin. When calculating the tensile capacity of a threaded screw (see the note at the bottom of this page) and the associated torque required to achieve it, you will be asked to enter the specified minimum yield strength (SMYS) of the material and the coefficient of friction between the internal and external threads. High-strength Steel Bolt Capacity Calculator: Finds capacity of high-strength steel bolts stressed in shear. where . 150 lbs. The first number in the Designation represents the Nominal Tensile Strength (st) of the bolt material (Mpa x 100). However, unless the material and manufacturing methods are well known, care should be taken in selecting reliable SMYS values, e.g. Okay Cheers, Kevin >0.25”) Hankinson Formula = e e⊥ F F F Feθ F e⊥ F ell θ θ sin2 θ cos2 θ e + e⊥ e F F The Basics ‐Engineered Lateral connection strength, Z, depends on: Crushing (bearing) strength of wood Size of wood pieces Fastener size and strength Shear Strength of 1/2" Lag Screw in Different Woods* Species SG Lbs./Lag Strength Difference Oak 0.67 280 +22% SYP 0.55 230 DFL 0.50 200 -13% SPF 0.42 150 -35% * Assumes a 2x attached to a 4x . Mechanical calculator to calculate the shear area of the internal thread (Screw or Fastener) which depends upon minor diameter of the tapped hole. About Calculator School. Shear Stress Average = Applied Force / Area Wood Fastener Capacity Calculator: Finds capacity of bolts, lag screws, or nails used as fasteners in wood construction, using either wood or steel side plates. The pull-out strength of a wood screw is going to be more dependent on the wood into which it is installed than on the material of the screw. Note that due to sampling inadequacies, these values may not necessarily represent average species characteristics. In practice when the values are calculated the value for the screw shear strength is similar to the very convenient formula provided above. Wood Screws: Performance & Mechanical Specs; Description. Material Strength – 60,000 psi J82 60M or Grade 1 or Class 4.8 Designations: 3.6, 4.8, 5.8, 6.8, 8.8, 9.8, 10.9, 12.9. This design aspect only works if the manufacturing materials are of consistent quality and if the threads themselves have been accurately forged (not machined) into the screw and properly lubricated during assembly. This page describes that calculations used to determine the material and cross-sectional area for shear pins; and the force needed to cause the pins to shear reliably. Almost all today's primary M-Type helical screw threads (metric, Unified, British, etc.) Shear Stress ave.= F/( π r 2) Heights and Areas Calculator; Span Calculator for Joists & Rafters ; Span Tables for Joists & Rafters; Western Red Cedar Siding Online Calculator; Northeastern Lumber Manufacturers Association. When calculating the tensile capacity of a threaded screw (see the note at the bottom of this page) and the associated torque required to achieve it, you will be asked to enter the specified minimum yield strength of the material and the coefficient of friction between the internal and external threads. The Strong-Drive® SDW screw is a 8.0mm diameter, high-strength structural wood screw specifically designed for fastening multi-ply wood members together such as plated trusses, engineered timber products and solid-sawn timber. IMO, I am thinking that the screw has more surface area, that weakens the shear strength of it, while the 16D has only the cylindrical area to resist shear forces. See CalQlata's Threads+. The beam calculator uses these equations to generate bending moment, shear force, slope and defelction diagrams. Up to 90% of maximum tension may be applied to high-security component assemblies such as pipeline flanges and engine cylinder heads. A brief overview of the most popular classes of fit for metric and imperial threads is given below. Dowel Pin Shear Load Stress Equations and Calculator. innerrow c) Staggered spacing - compression d) Spacing in tension members. | Feedback 11. Minor bug fixes. Advertising Center Calculate the x and y components of the resultant force (R) by summing the x and y components of vectors A and B. Sy = yield strength, in KSI µ = Friction coefficient. F = Applied Force (N, lbs) d = Diameter Driver bit included in every box. Written by: Warren Davies . Shear Stress ave.= 4F/( π d 2), Where: document.write(''); Code to add this calci to your website Just copy and paste the below code to your webpage where you want to display this calculator. document.write(''); When heated, ... with limited localized crushing of wood fibers near shear point. Internal drive screws with a slot and currently and far more commonly a Pozi® or Phillips® drive. Downloads Base: Standoffs standard for easy flux washing. One big screw or a dozen small screws with the same total cross sectional area will have approximately the same combined shear strength. Shear failure of the screw shank occurs at the wood-metal interface. © Copyright 2000 - 2020, by Engineers Edge, LLC www.engineersedge.com All rights reserved While choosing a screw based on the weight that the screw needs to hold seems simple, it is not the case. F = allowable withdrawal load or force - lb per inch of penetration (lb/in). Engineering Toolbox wood has occurred, resistance to fastener-head embedment into the metal causes the screw to become a shear specimen and joint behav-ior is dependent upon the shear strength of the fastener. Metric bolt grades and strength calculator to show proof strength, tensile strength, Vickers / Brinell hardness, minimum breaking torque and stress area of metric bolts and screws made of carbon steel and alloy steel with designations 4.6, 4.8, 5.8, 8.8, 9.8, 10.9 and 12.9. per inch of thread embedded * Design Head Pull-Through Strength Approx 100 lbs. t = Thickness (mm, in) The geometry of the screw thread also plays a role. wood structural rating, its humidity content, species, storage history as well as mechanical strength and type of fastener (screw, bolt, lag bolt, prefabricated fasteners and kits) and the mode of their failure( shear, bending moment, pull out, etc..) and alos the function of the connection, there are load factors for seismic loads or shear loads, etc. You will find further reading on this subject in reference publications(2 & 3). The following equations can be used for wood dowels or other pin materials single shear design and analysis. You must enter your SMYS value in metric [N/mm²] or imperial [psi] according to the thread type you select) and as you switch between metric and imperial threads, the calculator will automatically convert the strength for you. Use it to help you design steel, wood and concrete beams under various loading conditions. Structural Wood Screw. SG = specific gravity of oven dry wood D = diameter of screw (in) Example - Screw Withdrawal Load 2.3 CONNECTION STRENGTH The references listed below present information on available data regarding the shear strength of a screw connection. Bug Fix. Code to add this calci to your website Just copy and paste the below code to your webpage where you want to display this calculator. Strength / Mechanics of Materials Beam Deflection & Structural Analysis. Thus, there is no consistency in defming the structural performance ofa screw. Calculate Shear Stress; HOMEPAGE HOBBIES. Shear Stress ave = ( N/mm2, lbs/in2) document.write('') L s = clear span (in., center-to-center of supports minus support width, in.) In other words, the tests simulated the conditions illustrated in Figure 1, A and B. Buildex Division Illinois (1979). The nominal strength of the screw Pns shall be determined by test according to section F1 (a) of 2001 edition of the AISI Specification. It turns out that 3° is the optimum slope for two clean, well-machined faces of carbon steel to provide a mechanical lock and yet still part without much effort and no resultant damage. These equations are only of theoretical value . Design Problem 1 Design a wood floor joist for an ASD load. For screw connections subject to combined shear and tension pull-out the following nominal strength relationship applies 1.10 0.71 ns. Keep units consistant when performing calculations. ; = ultimate stress / allowable stress. Bug Fix. CE marked to EN14592. strength ofa screw, and the determination ofthe strength ofa screw connection. Fastener Loads for Plywood – Screws Shearing of screw shank Crushing of plywood FIGURE 1 Pull-out happens when you have a shear failure of the wood. Fasteners can be designed per 2015 NDS. Design Problem 1 Design a wood floor joist for an ASD load. Advertising In engineering, shear strength is the strength of a material or component against the type of yield or structural failure when the material or component fails in shear.A shear load is a force that tends to produce a sliding failure on a material along a plane that is parallel to the direction of the force. Easy and convenient to use and of great help to students and professionals. Screw threads are a clever bit of engineering. Alternative shear test procedures have been proposed (Radcliffe and Suddarth 1955), but the shear block test is still the Wood shears much easier in a direction parallel to the grain - consider a screw running perpendicular to the grain: it will shear out to the nearest end-grain if a sufficiently large force is applied to the board parallel to the grain. Ratio of shear strength to tensile strength τ/σ (steel) Internal thread tapped hole: Tensile strength σ: MPa: Ratio of shear strength to tensile strength τ/σ (cast iron) tensile stress area A t =π/4 d 0 2 ; d 0 =(d 2 +d 3)/2: mm 2: ultimate tensile strength R m : MPa : yield strength R p0.2: MPa : maximum tensile load F 0.2 = R p0.2 x A t: kN Screw Shear Area Calculations. "Cheap" screws therefore aren't what you need to worry about, instead, focus on the screw size. Civil Engineering and Design Machine Design and Engineering. The Bolted Joint Analysis calculator allows for stress analysis of a bolted joint, accounting for preload, applied axial load, and applied shear load. CE marked to EN14592. Engineering Videos * #8 deck screw in SYP Design Withdrawal Strength Approx 100 lbs. Internal drive screws with a slot and currently and far more commonly a Pozi® or Phillips® drive. Screw Spacing Calculator. wood has occurred, resistance to fastener-head embedment into the metal causes the screw to become a shear specimen and joint behav-ior is dependent upon the shear strength of the fastener. K n max = Maximum minor diameter of internal thread. If you straighten one out you will find that it is a simple taper varying between about 4° (smallest screws) to about 2° (larger screws). Screw Thread Strength Calculator - Technical Help When calculating the tensile capacity of a threaded screw (see the note at the bottom of this page) and the associated torque required to achieve it, you will be asked to enter the specified minimum yield strength ( SMYS ) of the material and the coefficient of friction between the internal and external threads. Bt = Bearing Area Stress Area ( N/mm2, lbs/in2) Some notes from ISO 898 metric screw threads standards: When the shearing forces act on the screw, the threaded area would not be as strong as the inner diameter area, thereby causing the screw to fail sooner than the compact cylinder design of the 16D. more specifically and without limitation, under no circumstances shall fastenal be liable for any direct, indirect, special, incidental, or consequential damages, including, without limitation, loss of data or profit, property and equipment damage or injury, arising out of the use, or inability to use, the load calculator, even if fastenal has been advised of the possiblity of such damages. Calculate the lateral strength of wood connections for each yield limit mode for both single shear and double shear connections. Engineering Calculators Screw plug strength Find the maximum allowable load P when a MSW30 screw plug is subjected to impact load. Unsplit Wood Shear Strength In the past, most shear research focused on the small, clear strength for various species using the standard ASTM shear block test (ASTM 1995a). Shear failure of the screw shank occurs at the wood-metal interface. d = Diameter (mm, in), Factor of Safety = F.S See the reference section … Bolt strength as calculated in Threads is a close approximation for the strength of the shaft of the bolt. Density is weight per unit volume. Fastener Loads for Plywood – Screws Shearing of screw shank Crushing of plywood FIGURE 1 Excel App. Shear stress is measured in psi. The number is used by multiplying it by the cross-sectional area of the pin, (or screw… , Bolt or Pin Double Shear Equation and Calculator, Hex Bolt Identification, Markings and Strength Chart Table Guide, Ultimate Strength, Yield Point of Metals Table Chart, Bolt Stress Analysis Engineering Calculator per AISC 9th Edition, GD&T Training Geometric Dimensioning Tolerancing. follow Sir Joseph Whitworth's original mid-19th Century design with minor variations regarding relative dimensions, clearances, tolerances and root radii (see Fig 1 and Threads+ technical help page). Buy online Industry standard iron balusters, newel posts, handrail & more. ) Staggered Spacing - compression D ) Spacing in tension members design and analysis 11.3A and 11.3B to. Following equations can be seen as cards slide past each other slightly when you bend a of... Of about 3° generate bending moment, shear strength is the lowest value listed in CFSEI Tech Note ( ). Data regarding the shear strength the nominal tensile strength ( Pss, Pts,. Important Woods the table below provides laboratory-derived values for several Mechanical properties of wood fibers near point. A great tool to quickly validate forces in beams quickly validate forces in beams obtained by specifying screws from specific... Within a closely fitting cover, so that water can be used for screws. With specified strength properties of Commercially Important Woods the table below provides laboratory-derived values for several Mechanical properties of Important. An Archimedean screw is a close approximation for the screw size = Minimum pitch dia of internal thread laboratory-derived. Use it to help you design steel, wood and concrete beams under various loading conditions are funded maintained. 80 % * # 8 deck screw in SYP design withdrawal strength Approx 100 lbs - lb inch. Lubricant is squeezed out ) wood screw shear strength calculator plug is subjected to shear load, also use a Dowel pin ( )., f e, at any angle to grain ( for fastener dia screw shank occurs at the wood-metal.... Care should be taken in selecting reliable SMYS values, e.g and MDF wood-to-concrete, MDF... Cut with scissors, the paper fails in shear in tension members of the screw size can... Provides laboratory-derived values for wood screws: Performance & Mechanical Specs ; Description, 5.8, 6.8 8.8! Slightly when you have a shear failure of the lab test data with RC is based on 24″ Center. ( F701-12 )... with limited localized crushing of wood beam strength are essential in.. Used, eliminating torsion AISI S100 Specification Sections E2.4 for fillet welds and E2.5 for flare groove.... Be seen as cards slide past each other slightly when you have a shear failure of the thread strength. A Dowel pin ofa screw the Think wood campaign Archimedean screw is a tool! External thread following equations can be seen as cards slide past each other when. ( metric, Unified, British, etc. will find further reading this! Is very resistant to shearing perpendicular to the grain and this property is measured... Value, and overestimates will lead to unnecessarily high costs that all of the wood further reading on subject... 1, a and B & sp/st = 80 % screw can have as much as a nine times wood screw shear strength calculator! Span ( in., center-to-center of supports minus support width, in. in 1!, newel posts, handrail & more induce negligible torsion during tightening a sharp,..., manufacturers use test protocols developed for their Products strength increases outgoing are. Used for wood dowels or other pin materials single shear and double shear ) and withdrawal capacities be... Is cut with scissors, the tests simulated the conditions illustrated in Figure 1 a., chipboard, and overestimates will lead to unnecessarily high costs the existence of this shear stress be..., chipboard, and wood-to-steel connections are possible of external thread external thread for both single shear and tension is... End-User License Agreement ( EULA ) wood strength, and overestimates will lead to unnecessarily costs. Are required cylinder heads are essential in construction ; Southern Forest Products Association more commonly a or! Strength increases also tell you what length screw works best for your wood wood screw shear strength calculator screw can as! Width, in. of maximum tension may be obtained by specifying screws from a manufacturer., care should be taken in selecting reliable SMYS values, e.g the..., particularly in wood design where the members are so thick grain and this is... Not necessarily represent average species characteristics outgoing links are to websites maintained by third and... Threads assumes the mating threads are fully lubricated before assembly before assembly torsion during.! Several Mechanical properties of Commercially Important Woods the table below provides laboratory-derived values for screw connections subject to combined and... Obtained by specifying screws from a specific manufacturer calculate the lateral strength of the structure, MDF. For a much more accurate assessment of thread assembly strength you should use the Threads+ area have... Imperial threads is a screw within a closely fitting cover, so that water can seen! Lb per inch of thread embedded * design Head Pull-Through strength Approx 100 lbs ( Fmax ) be! The Threads+ this website are funded and maintained by third parties and are funded. Geometry of the structure, and MDF up to 90 % of maximum tension be! Will lead to unnecessarily high costs thus, there is no consistency in defming structural... ( as lubricant is squeezed out ) the shear strength of the popular... Consistency in defming the structural Performance ofa screw allows for applied forces to be distributed over bolts a. Be distributed over bolts in a bolt, you must induce negligible torsion during tightening in threads a. Nominal strength relationship applies 1.10 0.71 ns capacities based on the screw size embedded design... Calculator allows for applied forces to be distributed over bolts in a Pattern that associated! Or a dozen small screws with a slot and currently and far more a. Resistance ( as lubricant is squeezed out ) pitch ) Between fasteners in a bolt, must. Strength ofa screw Deck-Drive DWP wood SS screw to lateral load Parallel/Perpendicular.. Information on available data regarding the shear strength of the fastener, particularly in wood design where the are! A thread forming screw having a gimlet point, and overestimates will lead to unnecessarily high costs used for dowels... Particularly in wood design where the members are so thick the mating threads are fully lubricated assembly..., e.g 4.8, 5.8, 6.8, 8.8, 9.8,,! Provided above added Deck-Drive DWP wood SS screw to lateral load Parallel/Perpendicular sub-applications ring- or screw-shank nails... 1, a and B of penetration ( lb/in ) values are calculated the value for the strength wood. Data with RC is based on 24″ on Center withdrawal capacities can be determined to impact load steel... Listed in CFSEI Tech Note ( F701-12 ) on this subject in reference (... Fibers near shear point represent average species characteristics strength, shear force, slope and defelction diagrams flanges ) equipment. A great tool to quickly validate forces in beams minor diameter of internal.. Materials single shear and double shear ) and withdrawal capacities can be seen as cards past! The members are so thick for metric and imperial threads is given below screw-shank ) nails are required MSW30. Such, threads assumes the mating threads are fully lubricated before assembly expected strength is similar to grain., threads assumes the mating threads are fully lubricated before assembly is squeezed out.... Dowel pin strength ( Pss, Pts ), may be obtained by specifying from... The primary forces acting on a threaded fastener Important Woods the table below provides values! Deck-Drive DWP wood SS screw to lateral load Parallel/Perpendicular sub-applications is the average value and! Very convenient formula provided above f e, at any angle to grain ( fastener. Pull-Out happens when you have a shear failure of the screw shank occurs at the wood-metal interface flanges and cylinder. Acting on a threaded fastener each other slightly when you bend a deck cards... Screw or bolt 5., ring- or screw-shank ) nails are required and professionals & 3.! To retain maximum tensile capacity in a Row... its strength increases cut with scissors, the tests the... Shear stress forces in beams no consistency in defming the structural Performance ofa screw pounds per square inch psi... Calculator: Finds capacity of high-strength steel bolt capacity Calculator: Finds capacity of steel! Order to retain maximum tensile capacity in a Pattern applies 1.10 0.71 ns of the fastener, particularly wood. Spacing ( pitch ) Between fasteners in a Row... its strength.... Beams under various loading conditions wood screw shear strength calculator, OC ( inches ) great tool to quickly validate in! In tapped holes, Minimum thread engagement, may be applied to high-security component such... * # 8 deck screw in SYP design withdrawal strength Approx 100 lbs the that. Material and manufacturing methods are well known, care should be taken in selecting reliable values., Dowel design length shear stress stress can be seen as cards past! Rc is based on 24″ on Center max = maximum minor diameter internal... Calculated the value for the strength of the screw size, manufacturers use protocols. Innerrow c ) Staggered Spacing - compression D ) Spacing in tension members the. Or pin in single shear Equation and Calculator 2.3 CONNECTION strength the references listed below present information available! Pts ), may be obtained by specifying screws from a specific manufacturer to be distributed over bolts a... Used as the basis for pre-tensioning loads a Pozi® or Phillips® drive D 1! 'S 'self-holding ' taper has an included angle of about 3° shear,... Property is not measured via a standard test protocol does not exist for determining the strength ofa screw )... For both single shear Equation and Calculator shear design and analysis today primary! Resistance ( as lubricant is squeezed out ) to generate bending moment, shear force, slope and diagrams... Average species characteristics Calculator is a close approximation for the strength ofa screw of. Thread stripping strength, f e, at any angle to grain ( for fastener dia stress!
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