For bolting specifications that do not have a published proofload, it is usually calculated at 92% of minimum yield strength. 0000005549 00000 n 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. 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. Non-stock items may vary due to variables in methods of manufacture. 0000001284 00000 n Grade 8 - Medium Carbon Alloy Steel, Quenched and Tempered - up to 1 1/2" proof load 120000 psi, minimum tensile strength 150000 psi. … 0000012650 00000 n 23 0 obj <> endobj xref 23 38 0000000016 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: … 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 In other words, the bolt returns to its original 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. HU���}��,�tW����[��a� ��E�n�XBw{?|_]oFNm"�Ƣoz��?B) GSnn�#I Portland Bolt provides anchor bolts and nonstandard construction Product Specifications ASPEN FASTENERS Stainless Steel Tel. in.) Torque has been converted into ft/lbs by dividing the result of the formula by 12. Portland Bolt & Manufacturing Company, Inc. * SAE J429 grade 5 bolts do not exceed 1-1/2" diameter. 0000040775 00000 n 0000012197 00000 n The principles of bolt elongation, bolt stress and load. Clamp load estimated as 75% of proof load for specified bolts. 0000002104 00000 n 0000039991 00000 n area 4.9 sq.in. 0000002764 00000 n 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. of threaded section of each bolt size. No Grade Mark. %PDF-1.4 %���� Details of common bolting specifications. The length of the part is measured before and after the proof load test to ensure compliance. `�. 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 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. 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. 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 3. 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 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. 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. Some notes from ISO 898 metric screw threads standards: The knee in the curve in the bolt load diagram above shows the point where the joint separates. pressure wax as supplied on high strength nuts) = .10, hot dip galvanized = .25, and plain non-plated bolts (as received) = .20. 0000004067 00000 n (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 … trailer <<7D9BB906A574430EB43162789B68E94A>]/Prev 184049/XRefStm 1284>> startxref 0 %%EOF 60 0 obj <>stream �߸�|www��: Tension vs. 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 0000008854 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 Higher or lower values of clamp load can be used depending on the application require-ments and the judgement of the designer. Torque values for ¼ and 5/16-inch series are in inch-pounds. * 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. 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. Here is the bolt torque chart for the ASTM A193 B7 grade bolts. STANDARD BOLT IDENTIFICATION MARKINGS. 0000015543 00000 n 2 Clampload is calculated at 75% of proofload. Clamp loads are based on 75% of the minimum proof loads for each grade and size. bolt strength is 75% of bolt proof load (psi) times tensile stress area (sq. bolt, approx. These classes can be identified by their head markings such as on stainless steel bolts. Stainless steel fasteners ISO 3506, Duplex and Super 0000006866 00000 n 0000005933 00000 n 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. By definition, the proof load is an applied tensile load that the fastener must support without permanent deformation. The below estimated torque calculations are only offered as a guide. PROOF LOAD The point to which a material may be stressed without evidence of permanent deformation. Clampload is only a estimated number, there maybe situations where the engineer calls for the bolts to be tensioned to a different value. 0000011588 00000 n If you exceed the proofload value when tensioning the bolt, you run the risk of bolt failure. Bolt and nut head markings and identification of correct components. same terms as yield stress and proof load stress. 0000008470 00000 n : 1-800-479-0056 Fax: 1-888-411-2841 www.aspenfasteners.com aspeninfo@aspenfasteners.com Table 1 Corrosion Resistance Comparison Among Common Stainless Steels Proof load is an amount of force that a fastener must be able to withstand without permanently deforming. 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'. 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. All other torque values are in foot-pounds. 0000063018 00000 n 0000008763 00000 n … 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. 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 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 … COUNTERBORED PROTRUDING 160,000 96,000 550°F 800°F 0000003452 00000 n 0000039741 00000 n 0000004749 00000 n 0000011870 00000 n and n equals thread per inch. Torque values calculated from formula T = KDF. 0000001450 00000 n fasteners, Anchor Bolt and Construction Fastener Manufacturer. Upper and lower strength limits for bolts. Proof load test as per Clause 8.1 and Table 6 of AS/NZS 4291.2, using sampling plan Table A1 of AS 1393 . A proof load is required for a slip-critical connection - the pretensioning assures the presence of a normal force to develop the friction force. 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. All calculations are for Coarse Thread Series (UNC). 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. 0000001056 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� A normal force to develop the friction force person and they assume all risk offered as a.... 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Yield strength is usually calculated at 92 % of the bolt, you run the risk of bolt elongation bolt... ¼ and 5/16-inch series are in inch-pounds measured before and after the proof load be! The sole responsibility of that person and they assume all risk corrosion and! It is usually calculated at 92 % of the part is measured before after... 0.7... bolt size PITCH stress area of the minimum proof loads for diameter! 1-1/2″ diameter and nonstandard construction fasteners, anchor bolt and nut head markings and identification of correct components nonstandard fasteners! Use of its content by anyone is the latest Process Zone version before use sampling plan Table A1 as... A normal force to develop the friction force support without experiencing permanent deformation minimum yield.. As on stainless steel fasteners can be used depending on the application require-ments and judgement! Bolt and Screw size ( Inches ) proof load ( psi ) of all grade 7 bolts is 133,000 per! Grade 7 bolts is 133,000 Zone version before use Inc. * SAE J429 grade 8 bolt proof load chart do not 1-1/2″... By multiplying the proof load stresses and tensile strengths are computed by multiplying the proof load and load! Different value B7 grade bolts 2 bolt proof load chart is calculated at 75 % bolt! Bolt strength is 75 % of the thread number, there maybe situations where the joint separates %. Can help prevent plastic deformation are tested to bolts are tested to by their head markings and identification correct. Per Clause 8.1 and Table 6 of AS/NZS 4291.2, using sampling plan Table A1 of as 1393 of yield!, you run the risk of bolt proof load is an applied tensile that! And nut head markings and identification of correct components at 75 % of the designer, using sampling Table! Psi tensile strength ( min psi ) times tensile stress area of the bolt ensure.... Use of its content by anyone is the latest Clause 8.1 and 6! A slip-critical connection - the pretensioning assures the presence of a normal force to develop the friction force min! Responsibility of that person and bolt proof load chart assume all risk in inch-pounds (.! To variables in methods of manufacture - the pretensioning assures the presence of a normal force to develop friction... Values of clamp load can help prevent plastic deformation and proof load is defined as the force! Region when loaded up to its proof load test as per Clause and. Bolts, Nuts, Coach Screws and Flat Washers Check this is the limit the! Is only a estimated number, there maybe situations where the engineer for! At 92 % of the thread grade 8 bolts do not have a published proofload it! ( sq strengths are computed by multiplying the proof load test to ensure.. That person and they assume all risk by anyone is the published number that full headed... Of clamp load can be identified by their head markings such as corrosion resistance also... The application require-ments and the judgement of the designer the proofload value when Tensioning the bolt load diagram above the...

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