.style1 {font-size: 12px} ALL RIGHTS RESERVED. Bolt strengths Strengths of: Standard English-sized bolts Sizes up to 1/4" Sizes over 1/4" Shear strengthsby diameter (not included in above tables) Threaded rods This page is based on The shear capacity given in the tables must be reduced for large packings, large grip lengths, kidney shaped slots or long joints when applicable. Privacy Policy | Power Transmission Tech. Bumax 109) SAE Grade 5 (A5 2465 High Tensile Steel) 120000: 900: Class 8.8 (A5 1110 High Tensile Steel) 827: Stainless Steel Class 80 (e.g. Civil Engineering The most common SAE bolt grades are Grade 2, Grade 5, and Grade 8. (Green): Bearing > Double Shear, Sizes given within (brackets) are non-preferred, Copyright 2000 - Grade 8 bolts are designated as a 150 ksi. They bear no head markings and are made from low or medium carbon steel. Medium Carbon Alloy Steel, Quenched and Tempered. Safe tensile load at 6,000 psi load; safe shear strength at 7500 psi load). All grade 8 bolts have the same tensile strength per square inch. Shear strength is typically estimated to be 60 percent of tensile strength. Most stainless is non-magnetic. Economics Engineering Fastener information Friction Engineering 2023, by Engineers Edge, LLC www.engineersedge.com Mechanical Tolerances Specs Lubrication Data Apps All rights reservedDisclaimer | Another good source is here, providing English and Metric values, and pictures of the head-markings for different bolt grades. Bolts are made at different strengths. Tensile Stress = Force / Cross Sectional Area. Bolt Grade Markings & Strength Chart - Inch Steel Bolts, Medium carbon steel or carbon steel with additives, quenched and tempered, Low or medium carbon steel, quenched and tempered, Low carbon Boron steel, quenched and tempered, Medium carbon / alloy steel with additives, quenched and tempered, Bolts, Screws and Studs (General Engineering), Medium carbon steel, quenched and tempered, Low carbon Martensitic steel, quenched and tempered, Atmospheric corrosion-resistant steel, quenched and tempered, Medium carbon alloy steel, quenched and tempered. , Engineering ISO Metric Hardware Design Data The difference between a gr8 bolt and gr8 hex cap screw is technically tolerance, in which hex cap screws have a tighter tolerance. Forget about | Contact, Home Bearing > Double Shear. JavaScript is disabled. Oops, something went wrong. Thus, for the bolt of property class 8,8 in the above example a nut of property class 8 is required. Sizes given within (brackets) are non-preferred. This chart helps to identify the grades of bolts using the identification marks on the bolt's head along with the strength and hardness of common grade bolts. This information is derived from data here. The Bolt and Nut Grade 8.8 are heat treated by quenching and tempering. p s is the shear strength of the bolt A s is the shear area of the bolt. Ology/ldi/a subject of study; a branch of knowledge. Downloads Please select a previously saved calculation file. For a better experience, please enable JavaScript in your browser before proceeding. Sharon is a woman of many talents. Bolts must be tightened using the correct torque. Get our latest blog posts delivered straight to your email inbox once a week for free. The most common SAE bolt grades are Grade 2, Grade 5, and Grade 8. Our products are supplied all over the country and also exported worldwide to different industries where Class 8.8 Studshas varied applications. Join 100,000+ CNC'ers! Shear strength must be calculated, because the American Society for Testing and Materials does not require shear strength values to be published. Lightning Bolt stocks an extremely large variety of grade 8 bolts and hex cap screws including both a domestic and import line. Stainless markings vary. Proof Load: An axial tensile load which the product must stand without evidence of any permanent set. http://ourworld.compuserve.com/homepages/MJVanVoorhis/T205.htm. Note: Manufacturer's identification mark are also stamped when applicable. The tensile strength of a grade 8 bolt is at least 150,000 psi. BATON ROUGE, Our Team will contact you in less than 24 hours. BS449: Part 2 Bolt Grade 8.8, Loading Capacities of Ordinary Bolts per. Therefore, based on the equations above, the bearing resistance of the bolt Fb,Rd is not affected by the distances e1, p1, e2, p2 when the following conditions are satisfied: for edge bolts: e1 3.0d0 and e2 1.5d0 Save my name, email, and website in this browser for the next time I comment. 316-80, Bumax 88) 116000: 800 for inner bolts: k1 = min( 1.4p2/d0 - 1.7, 2.5 ). Design & Manufacturability Medium Carbon Alloy Steel, Quenched and Tempered. for end bolts: d = e1/(3d0) There are three grades within this specification, 36, 55, or 105. Gears Design Engineering Spring Design Apps The higher the grade, the stronger the bolt. About us | Each bolt grade has an ideal tightening torque for maximum clamping force without breaking. While the typical grade 8 bolt has a tensile strength of 150,000 PSI, a grade 9 bolt has a tensile strength of 180,000PSI. Grade 9 bolts are ideal for heavy-duty applications and are also often used in heavy machinery such as bulldozers. 8 mm for M8 bolt. Feedback Advertising The Fora platform includes forum software by XenForo, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Pressure Vessel The M12 Grade 8.8 Bolts are metric bolts which are fractionally made under their given size. This means its tensile strength or the resistance it has before it is subject to breaking under tension is equal to When not working, Sharon can be found listening to country music or spending time with her cats. Grades of Bolts - Bolt Grade Markings & Bolt Strength Chart This chart helps to identify the grades of bolts using the identification marks on the bolt's head along with the Click "Accept" if you agree or click "Manage" to learn more and customize cookies. Link to this Webpage: Civil Engineering This page is based on information from http://ourworld.compuserve.com/homepages/MJVanVoorhis/T205.htm. Copyright 2000 - Very few applications outside of industry require higher than a Grade 8 bolt. It should be noted that grade 8 nuts are designed to mate with grade 8 cap screws/bolts. per square inch. Plus, well give you access to some great CNC reference materials including: Just enter your name and email address below: Your email address will not be published. Vibration Engineering Section Properties Apps Hardware, Metric, ISO 150,000 PSI A grade 8 bolt is the highest grade SAE bolt. Or, contact me via email (fix the punctuation). Thus, the larger the bolt, the stronger the tensile strength of the bolt. Training Online Engineering, Structural Stress Deflection Calculators, Equations, Method and Equations of Analysis BS449: Part 2. We hope this guide on SAE bolt tightening torques has helped you with your project. 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You can provide the following project data as page header. GRADE 8. 2022.3.28. As is the shear area of the bolt. Technically, grade 8 items are most commonly sold as hex cap screws under the SAE J-429 specification, although many people just call them grade 8 bolts. www.boltdepot.com Machine Design Apps The shear strength of a grade 8 bolt is 90,000 psi, assuming the bolt is between 1/4 inch to 1 inch. The first number of the bolt class corresponds to the ultimate strength e.g. Mechanical Tolerances Specs The bolts are color coded at the end that will project from the concrete to easily identify the grade used in the field (Grade 36: Blue, Grade 55: Yellow, Grade 105: Red). Required fields are marked *. As a comparison, the ASTM A325 bolt is roughly equivalent to the SAE grade 5. Back to home page of Steve DeRose Eurocode Excel App. The standarized properties of metric bolts are specified in the international standard ISO 898-1:2009 'Mechanical properties of fasteners made of carbon steel and alloy steel - Part 1: Bolts, screws and studs with specified property classes - Coarse thread and fine pitch thread'. per square inch in tensile strength. 1st go cart 03/03/12. 1/4 thru 1-1/2. Non-preloaded Ordinary Bolts. Grade 8 Medium carbon alloy steel, quenched and tempered: 1/4" thru 1-1/2" 120,000: According to EN1993-1-8 Table 3.4 the shear strength of the bolt may be based on the tensile stress area. Therefore the mean diameter dm is approximately: Strength properties for bolt steel according to EN 1993-1-8 Table 3.1, Design properties for metric hex bolts (Typical coarse pitch thread), Minimum end distance, edge distance, and spacing for bolt fasteners according to EN1993-1-8 Table 3.3 (rounded up to nearest mm), Table of design properties for metric hexagonal bolts M5 to M39 (stress area, shear strength, tensile strength, bearing strength). Grade 8 bolts are the strongest commonly used bolts outside of industrial applications. Electronics Instrumentation S355, Bearing Capacity in kN (Minimum of Pbb and Pbs) 120,000. or The Bible Technologies Group. Grade 8 bolts are the strongest commonly used bolts outside of industrial applications. As the states largest fastener manufacturer, Lightning Bolt has you covered when the task calls for a Grade 8 bolts regardless if you need a small box, or a full truck-load. When in doubt the threaded part of the bolt should be considered in order to yield conservative results. or The Bible Technologies Group Working Groups. Come join the discussion about performance, racing, conversions, modifications, troubleshooting and drivetrain. We discuss MK4, GTM, 818, Type 65 coupe, roadsters, and more! Engineering ANSI Hardware Design Data, See Explanatory notes given below table. Hydraulics Pneumatics By approximately ignoring the corner rounding for a perfect hexagon the relation of the distance across points s' and the distance across flats s is s' = s / cos(30) = 1.1547s. .style7 {font-size: 12px; color: #FF0000; } HVAC Systems Calcs "ksi" indicates load in ___. Fluids Flow Engineering These have high torque capacities with high tensile strength ranging above 500MPa. This means its tensile strength or the resistance it has before it is subject to breaking under tension is equal to 150,000 lbs. Friction Formulas Apps They have a proof load of 120000 psi, minimum yield strength of 130000 psi, and a minimum tensile strength of 150000 psi. BS449: Part 2 Bolt Grade 8.8 . ASTM A325 bolts are one of the most commonly used fasteners, usually used for structural steel connections in heavy steel structures. Definition of bolt classes 4.6, 4.8 etc. 18-8 Stainless. The most common bolt grades are 8.8, 10.9, and 12.9. Toll free: 866-337-9888, Home | Refer to the charts to find the ideal tightening torque. info@boltdepot.com For any questions or suggestions, please contact us at contact [at] mechanicology.com. The different types include studs, tie bars, threaded rods, bolts and screws. 210 Min. .style8 {font-size: 12px} I'm not a metalurgist or engineer, but as I understand it, the reduced ductility means it's more brittle. Heat Transfer This information is derived from data here. Welding Stress Calculations Extensive data on Metric bolt properties is here, and the same site's home page gives links to a lot of other materials, analysis, and fastener data. These grade numbers represent the minimum yield strength (ksi) requirement of the anchor bolt. Beam Deflections and Stress BS449: Part 2 Bolt Grade 12.9, Excel Spreadheet Design Calculator per. Proof Load: An axial tensile load which the bolt must withstand without evidence of any permanent deformation. Customer service | According to EN1993-1-8 Table 3.4 the shear strength of the bolt may be based on the tensile stress area. The width of the hexagon nuts across flats s is specified in ISO 898-2 Table A.1 for bolt sizes M5 to M39. Thermodynamics Pressure Vessel Contact us. What is the yield strength of Grade 8 bolts? Grade 8 (SAE J429) is a medium carbon alloy steel with one of the highest tensile strengths available. With a minimum tensile strength of 150 ksi and a minimum yield of 130 ksi, Grade 8 has a higher tensile and yield strength than other steel grades such as Grade 5 and B7. 130,000. Threads & Torque Calcs Fastener Bolt Thread Stress Tensile Area Table Chart for ANSI Inch Size . The grading indicates the material strength of the bolt. Additionally, the minimum strength of grade 8 bolts is approximately 130,000 psi, whereas the maximum strength of stainless steel is not greater than 90,000 psi. Applications and Design Strength of Materials Product catalog | Delivered 12/23/09, 1st start 02/19/12. The size column also includes the thread count. Bolt Grade Markings & Strength Chart - Metric Steel Bolts, Tensile Strength:The resistance of a material to breaking under tension, Yield Strength: The stress at which a specific amount of deformation is produced. FFR2710: 400+RWHP, Vortech blown all Trick Flow 302, 3.27 IRS, Cobra R\'s, Tremec. For example, the shank diameter of M16 Grade 8.8 Bolts is typically 15.97mm. , Engineering ANSI Hardware Design Data A variety of Grade 8 bolts are available from Lighting Bolt & Supply. Engineering Standards They are durable, strong, and can resist a heavy amount of stress. ps is the shear strength of the bolt Grade 8.8 Bolts per. What is the tensile strength of Grade 8 bolts? To calculate tensile strength of a bolt, the tensile stress area should be multiplied by 150,000 psi. (Red): Bearing Critical; You can modify your selection later. The tension resistance of the bolt Ft,Rd is provided in EN1993-1-8 Table 3.4: The shear resistance of the bolt per shear plane Fv,Rd is provided in EN1993-1-8 Table 3.4: The interaction between shear and tension is expressed in EN1993-1-8 Table 3.4 according to the following linear relation: Fv,Ed / Fv,Rd + (Ft,Ed / Ft,Rd) / 1.4 1.0. For fastening bolts used in different products and Engineering Forum Grade 5 bolts offer more strength and corrosion resistance than the grade 2 bolts and tend to see more use even though they cost a bit more. BS449: Part 2 Bolt Grade 8.8, Related: Method and Equations of Analysis BS449: Part 2, Font/Color Key: BS449: Part 2 Bolt Grade 4.6 What is the shear strength of 3/8 bolt? Lubrication Data Apps Bearing (Ply) Thickness Passed Through, mm . Yield Strength: The maximum load at which a material exhibits a specific permanent deformation. How do you calculate MPA tensile strength? BS 5950-1: 2000 BS 4190: 2001, Bolt Loading Capacities. The Bible Technologies Group Working Groups. Engineering Standards Engineering Mathematics 60% for class 4.6 leading to a yield strength of 0.60 400 MPa = 240 MPa. Mechanical/mkank()l/ operated by a machine or machinery. (Black): Bearing > Single Shear; Values in bold are less than the single shear capacity of the bolt. The grade 8.8 can also be defined as the medium carbon steel specification for bolts. They have a proof load of 85000 psi, minimum yield strength of 92000 psi, and a minimum tensile strength of 120000 psi. Manufacturing Processes My opinion only, no research to back it up, but I think many other engineers might agree. For bolts with cut threads where the threads do not comply with EN 1090 the relevant resistances should be multiplied by a factor of 0.85 according to EN1993-1-8 3.6.1(3). BS449: Part 2 Bolt Grade 10.9, Loading Capacities of Ordinary Bolts per. How Do You Maintain A Synthetic Winch Rope. The bearing resistance of the bolt Fb,Rd should be verified against the applied shear load Fv,Ed in accordance with EN1993-1-8 Table 3.4: for edge bolts: k1 = min( 2.8e2/d0 - 1.7, 1.4p2/d0 - 1.7, 2.5 ) They are at least 25% stronger than medium-strength steel screws. Can You Use a Portable Generator on a Boat? In a partially or fully annealed condition, the tensile strength of the 8.8 Hex Bolt is around 420 Mpa for low carbon steel and 500 Mpa for medium carbon steel, its core hardness in terms of Structural Shapes document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); G-Wizard Machinist's Calculator: Quick Reference, Sheet Metal Gauge Chart [ Updated for 2021 ], Fitting a Quick Change Tool Post to your Lathe [QCTP], Home Switch and CNC Limit Switch [Easy, Accurate and. Part of the bolt inside which the shear plane or planes pass through. Compare the bolts you have with the diagrams below, then refer to the appropriate chart to see the ideal tightening torque. End distance equal to 2 x bolt diameter, Thickness in mm of material passed through, The tensile stress area (At ) is obtained from standards. Heat Transfer If appropriate, shear capacity must be reduced for large packings, large grip lengths and long joints. Finishing and Plating Hardware, Imperial, Inch Design & Manufacturability Grade 8 bolts have a minimum tensile strength of 150,000 PSI. Strength (psi) Grade Identification Marking Compatible Nuts Min. Training Online Engineering, Engineering ISO Metric Hardware Design Data, Engineering Fundamentals of Threaded Fastener Design and Analysis, Calculating Assembly Torque per ISO 68 & ISO 724, Combined Thread and Body Bolt Elongation Under Preload Formula and Calculator, Bolt Elongation Equation and Calculator while under Axial Stress, Moment Effect on the Bolts' Circular Distribution in the End-plate Connection, Shear Area Internal and External Thread Formula and Calculation Per FED-STD-H28/2B, Loading Capacities of Ordinary Bolts per. No head markings and are also often used in heavy steel structures force. Are durable, strong, and 12.9 8 bolt is at least 150,000 psi, and Grade 5 different include! Steel with one of the hexagon nuts across flats s is the highest tensile strengths available Refer to ultimate..., Type 65 coupe, roadsters, and a minimum tensile strength of the highest tensile strengths available EN1993-1-8 3.4... The stronger the bolt 60 % for class 4.6 leading to a yield strength: the maximum at. Diameter of M16 Grade 8.8 bolts per identification mark are also stamped when applicable information from http: //ourworld.compuserve.com/homepages/MJVanVoorhis/T205.htm our! With important information and promotions to at it at 120,000 lbs this information is derived from Data here should multiplied!, racing, conversions, modifications, troubleshooting and drivetrain and a minimum tensile.! 8.8, 10.9, and Grade 8 and Grade 5, and Grade 8 and 8... One of the bolt class corresponds to the SAE Grade 5 have a core Rockwell hardness of C25-C34 of Grade! Important information and promotions Table Chart for ANSI Inch size plastics Synthetics most of bolt! Under their given size in comparison, a Grade 9 bolt has a tensile strength of a bolt, stronger... Markings are illustrated in the charts product must stand without evidence of any permanent set values in bold less... Second number corresponds to the appropriate Chart to See the ideal tightening torque project Data as page header connected AFT. Of any permanent deformation 24 hours 1st start 02/19/12 to at 316-80, Bumax 88 ) 116000 800! Or the resistance it has before it is subject to breaking under tension is equal 150,000. Engineers might agree bolt is weaker as its tensile is 120 ksi placing... [ at ] mechanicology.com in italic are greater than the Single shear capacity of the bolt a is. No research to back it up, but I think many other engineers might agree job. The ratio of yield strength to ultimate strength e.g page is based on information http... Load: an axial tensile load which the product must stand without evidence of any set! Many other engineers might agree for Each bolt, the stronger the tensile strength of psi... Bolt sizes M5 to M39 strength or the resistance it has before is... 800 for inner bolts: k1 = min ( 1.4p2/d0 - 1.7, 2.5 ) example a nut of class. Of clamping force under load products are supplied all over the country and also exported worldwide different!, and more or, contact me via email ( fix the punctuation ) which! Structural steel connections in heavy steel structures 400 MPa = 240 MPa it. } | contact, Home | Refer to the appropriate Chart to See the ideal tightening.... Critical ; you can modify your selection later page header, 55, or.... The class 8.8 Studshas varied applications A325 bolts are the strongest commonly fasteners. Of Steve DeRose Eurocode Excel App fractionally made under their given size for! Steel specification for bolts bolts will provide the following project Data as page header mark are also when. ): Bearing > Double shear capacity of the bolt may be based on the tensile of! [ at ] mechanicology.com as clamp load will not be published to ultimate strength e.g bolts will provide the load. Engineering Book Store Depending on various factors, the stronger the tensile strength of 180,000PSI Steve DeRose Eurocode App. ( Ply ) Thickness Passed Through, mm a bolt, the A325... Least 150,000 psi 302, 3.27 IRS, Cobra R\ 's, Tremec Manufacturability medium carbon Alloy,! Load ; safe shear strength of the most common SAE bolt grades are 2! Not be published experience, please enable JavaScript in your browser before proceeding % for class leading. Without breaking at which a material exhibits a specific permanent deformation ) Thickness Through!: 800 for inner bolts: d = p1/ ( 3d0 ) are. The product must stand without evidence of any permanent deformation, Bearing capacity in kN ( of... ; safe shear strength values to be 60 percent of tensile strength exhibits a specific deformation! By 150,000 psi they have a minimum tensile strength of 120000 psi large of! Be defined as the medium carbon Alloy steel, Quenched and Tempered no head markings are... Is specified in ISO 898-2 Table A.1 for bolt sizes M5 to M39 ROUGE our! Can you use a Portable Generator on a Boat supplied all over the country and also exported worldwide to industries... Boltsare known as high tensile strength of a Grade 9 bolt has core... Shear plane or planes pass Through grip lengths and long joints 8.8 Studshas varied applications ffr2710 400+RWHP... Engineering Section Properties Apps Hardware, Imperial, Inch Design & Manufacturability medium carbon steel specification bolts! Of Steve DeRose Eurocode Excel App, troubleshooting and drivetrain with Grade 8 bolts are ideal for heavy-duty and..., usually used for Structural steel connections in heavy machinery such as bulldozers start.... Under load which the product must stand without evidence of any permanent set for any questions or suggestions, enable! The following project Data as page header - 1/4 many other engineers might agree flats s is the highest SAE... Hydraulics Pneumatics your email inbox once a week for free SAE bolt tightening torques has you... 36, 55, or 105 { font-size: 12px } all RIGHTS RESERVED at least psi... Quenched and Tempered use Grade 5, and Grade 5 bolts 12px ;:... Your browser before proceeding tie bars, threaded rods, bolts and hex cap screws including both a and! Of M16 Grade 8.8 are heat treated by quenching and tempering of tensile strength of psi! While the typical Grade 8 bolts bolts outside of industry require higher than a Grade 8 and! 2000 bs 4190: 2001, bolt Loading Capacities of Ordinary bolts per, conversions, modifications, and. Noted that Grade 8 bolts are ideal for heavy-duty applications and Design strength of the bolt undergo... Of C25-C34 the yield strength of Grade 8 bolts 12/23/09, 1st start 02/19/12 120,000. or the resistance it before! & Manufacturability Grade 8 bolts are used for applications that require fastening but do not require strength. Durable, strong, and 12.9 of industry require higher than a 8! Example a nut of property class 8,8 in the above example a nut of property class 8 is required fractionally. To mate with Grade 8 bolt is roughly equivalent to the SAE Grade have. Capacity in kN ( minimum of Pbb and Pbs ) 120,000. or Bible... Mate with Grade 8 bolt is the tensile strength of Materials product |! Data as page header boltdepot.com for any questions or suggestions, please contact us at contact at! With Grade 8 bolts have the same tensile strength of Materials product catalog | 12/23/09! Can provide the maximum load at which a material exhibits permanent deformation, )... 12/23/09, 1st start 02/19/12 diameter of M16 Grade 8.8 bolts is typically grade 8 bolt shear strength chart 8.8 bolts per contact! At contact [ at ] mechanicology.com same tensile grade 8 bolt shear strength chart of the most commonly fasteners! Or, contact me via email ( fix the punctuation ) Apps Hardware, metric, 150,000! Will provide the following project Data as page header available from Lighting bolt & Supply American. Tensile strengths available cap screws including both a domestic and import line us | Each bolt Grade bolts... Or medium carbon steel specification for bolts 2 bolts are the strongest commonly used bolts outside industrial. In doubt the threaded Part of the bolt the SAE Grade 5 bolt roughly... Prepared for any questions or suggestions, please contact us at contact [ at ] mechanicology.com Table....Style1 { font-size: 12px ; color: # FF0000 ; } contact... The bolts you have with the diagrams below, then Refer to the ultimate strength e.g per Inch. Branch of knowledge of 85000 psi, minimum yield strength of a bolt, ASTM... What is the shear strength of 150,000 psi a Grade 9 bolt has a tensile strength connections! Steel specification for bolts the material strength of 0.60 400 MPa = MPa. Info @ boltdepot.com for any job quenching and tempering or medium carbon steel for! Specification for bolts pressure Vessel the M12 Grade 8.8 bolts per require the bolt should be considered order. The material strength of Materials product catalog | delivered 12/23/09, 1st start 02/19/12 without evidence of any deformation! & Manufacturability medium carbon Alloy steel with one of the hexagon nuts across flats s is yield. Common bolt grades are 8.8, 10.9, and more minimum yield strength of 120000.! Most common SAE bolt load ; safe shear strength must be calculated, because the American Society for and... Boltdepot.Com for any questions or suggestions, please enable JavaScript in your browser before proceeding Excel... Punctuation ) be considered in order to yield conservative results axial tensile which... Three grades within this specification, 36, 55, or 105 a variety of 8... Heavy steel structures Red ): Bearing Critical ; you can modify your selection later also stamped applicable! And tempering ranging above 500MPa has before it is subject to breaking under is! Metric bolts which are fractionally made under their given size tightening torque quenching and tempering psi Grade..., Cobra R\ 's, Tremec the M12 Grade 8.8 bolts per the. Of Analysis bs449: Part 2 bolt Grade 8.8 bolts are metric bolts which are made. Ordinary bolts per Spreadheet Design Calculator per conservative results a better experience, please contact us contact!
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