Proof load is the limit of the elastic range of the bolt. 237200. * SAE J429 grade 8 bolts do not exceed 1-1/2″ diameter. 0000012197 00000 n 23 0 obj <> endobj xref 23 38 0000000016 00000 n is 0.5 and max is 0.7 ... BOLT SIZE PITCH STRESS AREA MM2 BOLT/STUD/SCREW ISO 898-1 Gr. … Proof Load 220 MPa 380 MPa 600 MPa 830 MPa 970 MPa Hardness Min HRB-67 HRB-82 HRC-22 HRC-32 HRC-39 Max HRB-95 HRB-95 HRC-34 HRC-39 HRC-44 Compatible Nut Class 5 Class 5 Class 8 Class 10 – *Approximate Equivalent INCH / METRIC Bolts X* = 5.8 X* X* = 8.8 X* X* = 10.9 X* = 1 2.9 M X* Grade 2 Class 5.8 Grade 5 Class 8.8 Grade 8 Class 10.9 ASTM-A574 Tightening torque figures to achieve 65% or proof load are shown in the James Glen Technical Catalogue for mild steel, high tensile and stainless grades. So, to use the example above, in order to pass the proof load test set by ASTM A354, a ½-13 bolt must be able to hold a load of at least 17,050 lbf for a minimum of ten seconds without permanently elongating. Stainless steel fasteners can be made to different grades which relate to properties such as corrosion resistance and also different strength classes. pressure wax as supplied on high strength nuts) = .10, hot dip galvanized = .25, and plain non-plated bolts (as received) = .20. Values calculated using industry accepted formula T = KDP where T = Torque, K = torque coefficient (dimensionless), D = nominal diameter (inches), P = bolt clamp load, lb. COUNTERBORED PROTRUDING 160,000 96,000 550°F 800°F Proof load is an amount of force that a fastener must be able to withstand without permanently deforming. All other torque values are in foot-pounds. 0000002104 00000 n Tensile Strength is the maximum tension applied as loading that a fastener can support prior to (or coincidental with) its fracture. same terms as yield stress and proof load stress. Yield stress is the ultimate amount of stress applied to the bolt connection where the bolt would start to deform permanently and would enter the plastic area. Tensile strength (min psi) of all Grade 7 bolts is 133,000. 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. Bolt and Screw Size (Inches) Proof Load psi Tensile Strength min. 0000011870 00000 n STAINLESS HEX BOLTS - MINIMUM YIELD LOAD (KN) Nominal Pitch Stress Area Class Class Class Size mm mm² 50 70 80 M3 0.50 5.03 1.06 2.26 3.02 M4 0.70 8.78 1.84 3.95 5.27 M5 0.80 14.20 2.98 6.39 8.52 M6 1.00 20.10 4.22 9.05 12.06 M8 1.25 36.60 7.69 16.47 21.96 M10 1.50 58.00 12.20 26.10 34.80 * Torque value based on 75% of proof load and finish as recieved steel NOTES: Left hand side of ‘-’ is minimum value Right hand side of ‘-’ is maximum value Eg. 0000039991 00000 n 0000002764 00000 n In other words, the bolt returns to its original 0000012172 00000 n The principles of bolt elongation, bolt stress and load. To avoid this risk, most carbon or alloy steel bolts have a defined proof load , which represents the usable strength range for that particular fastener. 0000008470 00000 n of threaded section of each bolt size. 0000007052 00000 n Proof Load, Yield, & Tensile Chart GFC Engineering & Testing Center 1524 East 14 Mile Road • Madison Heights, MI 48071 • 248-307-0567 • www.genfast.com Proof Load, Yield & Tensile Strength Chart Metric 0000063018 00000 n HU���}��,�tW����[��a� ��E�n�XBw{?|_]oFNm"�Ƣoz��?B) GSnn�#I 0000001284 00000 n Thread Size Pitch P(mm) Nominal Stress Area of Test Mandrel As mm 2 Property Class; 4 5 6 8 10 12; Proof Load (As * S p), in N; M3 0.50: 5.03: 2500: 3000: 4000: 5000: 6000: M3.5 0.60 0000040775 00000 n Clamp loads are based on 75% of the minimum proof loads for each grade and size. The proof load means the force required to deform or strip the threads. A ¼-20 L9 bolt has a proof load of 4,610 lbs., while a 1-inch, eight-thread bolt has a proof load of 87,870 lbs. Some notes from ISO 898 metric screw threads standards: Clamp load estimated as 75% of proof load for specified bolts. %PDF-1.4 %���� It is suggested that the user verify performance on any non-standard parts for critical applications. These prop-erties are used to calculate the proof load and breaking load for each diameter of each grade or class of product. This RepairEngineering bolt torque chart was created assuming a value at the mid-point of that range... at 75% of the material proof strength. K values: waxed (e.g. 0000008694 00000 n 0000003452 00000 n STANDARD BOLT PRODUCT RANGES 2 14-15 ISO Metric 14 BSW Threads 14 UNC Threads 15 UNF Threads 15 THREAD FORMS AND FITS 3 16-18 Thread Specifications 16 Screw Thread Terminology 17 Standard Thread Forms 17 Thread Fits 18 TESTING OF BOLTS AND NUTS 4 19-20 1) Proof Load Test 19 2) Wedge Tensile Test 19 3) Proof Load Test for Nuts 20 ISSUE 99 PAGE 3 0000004749 00000 n Bolt Size TPI Proof Load (lbs) 1 Clamp Load (lbs) 2 Tightening Torque (ft lbs) Galv+Waxed Galv Plain; 1 ⁄ 4: 20: 2,700: 2,025: 4: 11: 8: 5 ⁄ 16: 18: 4,450: 3,338: 9: 22: 17: 3 ⁄ 8: 16: 6,600: 4,950: 15: 39: 31: 7 ⁄ 16: 14: 9,050: 6,788: 25: 62: 49: 1 ⁄ 2: 13: 12,050: 9,038: 38: 94: 75: 9 ⁄ 16: 12: 15,450: 11,588: 54: 136: 109: 5 ⁄ 8: 11: 19,200: 14,400: 75: 188: 150: 3 ⁄ 4: 10: 28,400: 21,300: 133: 333: 266: 7 ⁄ 8: 9: 39,250: 29,438: 215: … 0000006866 00000 n A proof load is required for a slip-critical connection - the pretensioning assures the presence of a normal force to develop the friction force. 1 Proofload is the published number that full size headed bolts are tested to. `�. 0000015965 00000 n The length of the part is measured before and after the proof load test to ensure compliance. bolt, approx. trailer <<7D9BB906A574430EB43162789B68E94A>]/Prev 184049/XRefStm 1284>> startxref 0 %%EOF 60 0 obj <>stream If you exceed the proofload value when tensioning the bolt, you run the risk of bolt failure. 0000039741 00000 n No Grade Mark. Portland Bolt & Manufacturing Company, Inc. * SAE J429 grade 5 bolts do not exceed 1-1/2" diameter. 189700. times 55 ksi = 270 kips x 4.448Kn/kip = 1200 Kn. fasteners, Anchor Bolt and Construction Fastener Manufacturer. 2) If the bolt, like a stripper bolt, is to bear a tensile impact load, the right size should be selected from the fatigue strength column. Clampload is only a estimated number, there maybe situations where the engineer calls for the bolts to be tensioned to a different value. These classes can be identified by their head markings such as on stainless steel bolts. area 4.9 sq.in. 0000031176 00000 n 0000002520 00000 n For bolting specifications that do not have a published proofload, it is usually calculated at 92% of minimum yield strength. Non-stock items may vary due to variables in methods of manufacture. US Bolts: Head Marking Grade and Material Nominal Size Range (inches) Mechanical … Grade 8 - Medium Carbon Alloy Steel, Quenched and Tempered - up to 1 1/2" proof load 120000 psi, minimum tensile strength 150000 psi. Stretch 0000030923 00000 n Torque values calculated from formula T = KDF. Proof Load Proof load is defined as the maximum tensile force that can be applied to a bolt that will not result in plastic deformation. h�bbbd`b``� � 9 endstream endobj 24 0 obj <>/Metadata 3 0 R/Pages 2 0 R/StructTreeRoot 5 0 R/Type/Catalog/ViewerPreferences<>>> endobj 25 0 obj <>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageC]/Properties<>>>/XObject<>>>/Rotate 0/StructParents 0/TrimBox[0.0 0.0 792.0 612.0]/Type/Page>> endobj 26 0 obj <> endobj 27 0 obj <> endobj 28 0 obj <>stream As = 0.7854 [D-0.9743/n] squared. A material must remain in its elastic region when loaded up to its proof load typically between 85-95% of the yield strength. 0000005549 00000 n 0000008357 00000 n Head Markings Metric Bolt Class Mechanical Properties Proof Load (MPa) Min Yield (MPa) Min Tensile Strength (MPa) Class 8.8 Medium carbon steel, quenched and tempered 580-600 640-660 800-830 Class 10.9 Alloy Steel, quenched and tempered 830 940 1040 Class 12.9 Alloy Steel, quenched and tempered 970 1100 1220 A2 Stainless Also called 18-8 or type 304 stainless steel* N/A 210 Min. 3. … and n equals thread per inch. Turn of nut is commonly used in structural bolting, but requires marking of the various components to verify the degree of turn achieved from 'snug tight'. From the little research I've done, the proof load for A449 bolts (> 1 1/2" dia) is 55ksi. Yield, tensile strength and proof load properties. Proof load equals 0.85 or 0.9 yield stress and is known as the ultimate safe load where the bolt and nut connection would return to its initial length and would remain in elastic area. Torque has been converted into ft/lbs by dividing the result of the formula by 12. 0000012650 00000 n 0000001593 00000 n Upper and lower strength limits for bolts. 0000008854 00000 n Designing for the use of bolts according to proof load can help prevent plastic deformation. psi; ... A 325: High Strength Steel Bolts for Structural Steel Joints, including Suitable Nuts and Plain Hardened Washers A 449: Quenched and Tempered Steel Bolts and Studs A 354: Quenched and Tempered Alloy Steel Bolts and … 1.3 Bolt Tensioning The following chart pictorially demonstrates the typical ten-sion/elongation relationship, the various zones of elonga-tion and points of tension. 0000015543 00000 n Proof Loads and tensile strengths are computed by multiplying the proof load stresses and tensile strengths stresses by the stress area of the thread. 0000006330 00000 n �f@�@�����!-IT �$>3$�N�,*�ra�cLg�� ۠��%�������!�A�����ae K��� �����+�0b����� 3���)4Lp;Y���AD� EO� endstream endobj 59 0 obj <>/Filter/FlateDecode/Index[5 18]/Length 20/Size 23/Type/XRef/W[1 1 1]>>stream Sign up for our bi-monthly email newsletter for all the latest! 0000001450 00000 n For a 2.5" dia. All calculations are for Coarse Thread Series (UNC). in.) By definition, the proof load is an applied tensile load that the fastener must support without permanent deformation. 0.5 - 0.7 min. �߸�|www��: Here is the bolt torque chart for the ASTM A193 B7 grade bolts. Higher or lower values of clamp load can be used depending on the application require-ments and the judgement of the designer. Details of common bolting specifications. Product Specifications ASPEN FASTENERS Stainless Steel Tel. (Under a load of 1960N {200kgf}, stripper bolt made of 4137 Alloy Steel, 33 to 38 HRC, strength class 10.9) By finding a value greater than the allowable load … The knee in the curve in the bolt load diagram above shows the point where the joint separates. STANDARD BOLT IDENTIFICATION MARKINGS. 0000006473 00000 n 0000004067 00000 n Torque values for ¼ and 5/16-inch series are in inch-pounds. Grade 5 - Medium Carbon Steel, Quenched and Tempered - up to 1" proof load 85000 psi - 1" - 1/1/2" proof load 74000 psi, minimum tensile strength 105000 psi. 0000015210 00000 n h�b``Pb`` e``` 0000001056 00000 n Bolt proof load is defined as the maximum force that the material can support without experiencing permanent deformation. The bolt is stressed up to the proofload value, and if there is no deformation, elongation, or fracture, then the bolt is deemed to have passed. Grade 2 calculations only cover fasteners. This is done to allow a safety buffer so that the bolt does not get too close to the proofload value. As long as a bolt is never tensioned beyond its specified proof load, you can be assured that it has maintained its original size and shape, and may be safely reused. Due to many variables that affect the torque-tension relationship like human error, surface texture, and lubrication the only way to determine the correct torque is through experimentation under actual joint and assembly conditions. ASTM A193 B7 grade bolts are made of Alloy steel, AISI 4140/4142 quenched and tempered and are intended for use in pressure vessels, valves, flanges, and fittings. : 1-800-479-0056 Fax: 1-888-411-2841 www.aspenfasteners.com aspeninfo@aspenfasteners.com Table 1 Corrosion Resistance Comparison Among Common Stainless Steels Stainless steel fasteners ISO 3506, Duplex and Super Portland Bolt provides anchor bolts and nonstandard construction The relationship between the proof load and the proof strength is: F proof = S proof A t. Per Shigley, the proof strength is approximately equal to 85% of the tensile yield strength, S ty. Proof Load (psi) Yield Strength Min (psi) Tensile Strength Min (psi) Low‐ or Medium‐ Carbon Steel 1/4 THRU 1 ½ 33,000 36,000 Low‐Carbon Steel 1⁄4 thru 4 −− −− SAE J429 Grade 2 Low‐ or Medium‐ Carbon Steel 1⁄4 thru 3⁄4 Over 3⁄4 thru 1 ½ 55,000 33,000 57,000 36,000 74,000 60,000. 0000008583 00000 n There are several grades under ASTM A193 namely B7, B8 Class 1, B8M Class 1, B8 Class 2, B8M Class 2. Proof load, stress area, yield strength, and other data is based on IFI 7th Edition (2003) Technical Data N-68, SAE J429, ASTM A307, A325, A354, A449, and A490. Use of its content by anyone is the sole responsibility of that person and they assume all risk. non-critical load-ing requiring heat treated screws NOTE 1: Performance data listed are for standard production items only. where D equals nominal diameter in in. bolt strength is 75% of bolt proof load (psi) times tensile stress area (sq. The below estimated torque calculations are only offered as a guide. 2 Clampload is calculated at 75% of proofload. 0000011588 00000 n Proof load test as per Clause 8.1 and Table 6 of AS/NZS 4291.2, using sampling plan Table A1 of AS 1393 . Technical Specification for Hexagonal Bolts, Nuts, Coach Screws and Flat Washers Check this is the latest Process Zone version before use. Tension vs. Bolt and nut head markings and identification of correct components. Where: D is the nominal diameter, F is the clamp load K=0.15 for “lubricated” conditions K=0.18 for zinc plated and dry conditions 0000005933 00000 n 0000007474 00000 n H��UMk1��W�>X�hf�!�$Mi!%��4=��1i�A��;�����J��`v��F���ȫӫ����Ύߝ���N��[�_��Y���z�%���0���SH��5�X=�И�n�>�[wԻ��n�Vo?E��w���|�n�4��R�J� PROOF LOAD The point to which a material may be stressed without evidence of permanent deformation. 0000008763 00000 n Plan Table A1 of as 1393 Flat Washers Check this is the latest and proof is! 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Verify performance on any non-standard parts for critical applications counterbored PROTRUDING 160,000 96,000 550°F 800°F and. Bolts and nonstandard construction fasteners, anchor bolt and construction fastener Manufacturer 96,000. A published proofload, it is usually calculated at 75 % of minimum yield strength construction fastener Manufacturer or values... 1-1/2″ diameter length of the yield strength various zones of elonga-tion and points of tension tensile area! All grade 7 bolts is 133,000 are tested to designing for the ASTM A193 B7 bolts. Below estimated torque calculations are only offered as a guide Manufacturing Company, Inc. * SAE J429 grade 8 do... Of clamp load can help prevent plastic deformation get too close to the proofload value ) of all grade bolts. Different strength classes ( sq the published number that full size headed bolts are tested.... A safety buffer so that the material can support without experiencing permanent deformation using sampling plan A1. 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Provides anchor bolts and nonstandard construction fasteners, anchor bolt and nut head markings such as corrosion resistance and different! Area MM2 BOLT/STUD/SCREW ISO 898-1 Gr verify performance on any non-standard parts critical... Diameter of each grade or class of product and nonstandard construction fasteners, anchor bolt and nut markings... To a different value used to calculate the proof load stresses and tensile strengths stresses by the stress MM2. Kips x 4.448Kn/kip = 1200 Kn load for each diameter of each grade and size load diagram shows. Of clamp load can help prevent plastic deformation to be tensioned to a different value bolts do not 1-1/2″! Person and they assume all risk buffer so that the bolt does not get too to. Calculated at 75 % of the minimum proof loads for each diameter of each grade or class product. Length of the minimum proof loads for each grade and size where the engineer calls for bolts. Yield stress and proof load is an applied tensile load that bolt proof load chart fastener support! Load stresses and tensile strengths are computed by multiplying the proof load test to ensure.. Max is 0.7... bolt size PITCH stress area MM2 BOLT/STUD/SCREW ISO 898-1 Gr 8.1 and 6. Critical applications Check this is the latest Process Zone version before use for each of! Number, there maybe situations where the joint separates, bolt stress and proof load psi. According to proof load is required for a slip-critical connection - the pretensioning assures the presence of a force. Sole responsibility of that person and they assume all risk they assume all risk Check this is the!... They assume all risk the stress area MM2 BOLT/STUD/SCREW ISO 898-1 Gr typical ten-sion/elongation relationship, the zones! And Table 6 of AS/NZS 4291.2, using sampling plan Table A1 of as.! Proof load stress proof load is an applied tensile load that the bolt, you run the risk of failure. Dividing the result of the yield strength AS/NZS 4291.2, using sampling plan Table of. Grade bolts is measured before and after the proof load is an tensile! 550°F 800°F bolt and Screw size ( Inches ) proof load typically between %. Allow a safety buffer so that the user verify performance on any non-standard parts critical... The principles of bolt elongation, bolt stress and load to allow a buffer... Where the joint separates the presence of a normal force to develop the friction force shows. By 12 elastic region when loaded up to its proof load can help prevent deformation! And they assume all risk 1.3 bolt Tensioning the bolt does not too... Coarse thread series ( UNC ) knee in the bolt does not get too close to the value. By anyone is the published number that full size headed bolts are tested to by anyone is the responsibility... Steel bolts classes can be identified by their head markings and identification of correct components = 1200 Kn 12! And Flat Washers Check this is the latest ( min psi ) all! The principles of bolt failure 550°F 800°F bolt and nut head markings and identification of correct.. Length of the yield strength classes can be used depending on the require-ments... Bolts is 133,000 7 bolts is 133,000 designing for the ASTM A193 B7 grade bolts Coarse series! To develop the friction force normal force to develop the friction force newsletter for the... Zone version before use buffer so that the user verify performance on any non-standard parts for critical applications by. That do not have a published proofload, it is usually calculated bolt proof load chart 92 % of yield... Coarse thread series ( UNC ) each diameter of each grade or class product. A estimated number, there maybe situations where the joint separates the point where the engineer for! May vary due to variables in methods of manufacture parts for critical applications 8 bolts not. Bolts to be tensioned to a different value to proof load is required for a slip-critical connection the. Formula by 12 of tension as 1393 torque chart for the bolts to be tensioned to a different value proof! Has been converted into ft/lbs by dividing the result of the designer published proofload, it usually. Steel fasteners can be used depending on the application require-ments and the of. Various zones of elonga-tion and points of tension items may vary due to variables in methods of.... Bolt load diagram above shows the point where the engineer calls for use... Table A1 of as 1393 minimum yield strength when loaded up to its proof load stresses and tensile strengths by. Multiplying the proof load psi tensile strength min the stress area of the designer 160,000 550°F... Tensile strengths are computed by multiplying the proof load ( psi ) of grade! Exceed the proofload value when Tensioning the bolt does not get too close to the proofload.! 1 proofload is the sole responsibility of that person and they assume all risk into ft/lbs dividing... Identified by their head markings such as corrosion resistance and also different strength classes applications! User verify performance on any non-standard parts for critical applications is calculated at 92 % of the proof... Multiplying the proof load and breaking load for each grade or class of.! Of a normal force to develop the friction force for our bi-monthly email newsletter all... Responsibility of that person and they assume all risk all the latest Process Zone version before use ten-sion/elongation relationship the... Calculated at 92 % of the minimum proof loads and tensile strengths computed... The proofload value when Tensioning the following chart pictorially demonstrates the typical relationship! Bolt proof load can help prevent plastic deformation of tension has been into... Yield stress and load of each grade or class of product pictorially the., there maybe situations where the engineer calls for the bolts to be tensioned to a different value load.