For bolting specifications that do not have a published proofload, it is usually calculated at 92% of minimum yield strength. 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. 0000008763 00000 n area 4.9 sq.in. This is done to allow a safety buffer so that the bolt does not get too close to the proofload value. Sign up for our bi-monthly email newsletter for all the latest! PROOF LOAD The point to which a material may be stressed without evidence of permanent deformation. 1 Proofload is the published number that full size headed bolts are tested to. Portland Bolt provides anchor bolts and nonstandard construction K values: waxed (e.g. is 0.5 and max is 0.7 ... BOLT SIZE PITCH STRESS AREA MM2 BOLT/STUD/SCREW ISO 898-1 Gr. 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. STANDARD BOLT IDENTIFICATION MARKINGS. 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 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. 0000006473 00000 n Product Specifications ASPEN FASTENERS Stainless Steel Tel. 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� 0000031176 00000 n 0000005933 00000 n 0000015210 00000 n No Grade Mark. 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 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 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 … By definition, the proof load is an applied tensile load that the fastener must support without permanent deformation. and n equals thread per inch. A proof load is required for a slip-critical connection - the pretensioning assures the presence of a normal force to develop the friction force. Details of common bolting specifications. 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 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. Grade 8 - Medium Carbon Alloy Steel, Quenched and Tempered - up to 1 1/2" proof load 120000 psi, minimum tensile strength 150000 psi. Here is the bolt torque chart for the ASTM A193 B7 grade bolts. 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. In other words, the bolt returns to its original COUNTERBORED PROTRUDING 160,000 96,000 550°F 800°F 0000011870 00000 n 23 0 obj <> endobj xref 23 38 0000000016 00000 n 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. Tensile Strength is the maximum tension applied as loading that a fastener can support prior to (or coincidental with) its fracture. non-critical load-ing requiring heat treated screws NOTE 1: Performance data listed are for standard production items only. These prop-erties are used to calculate the proof load and breaking load for each diameter of each grade or class of product. The knee in the curve in the bolt load diagram above shows the point where the joint separates. Stainless steel fasteners can be made to different grades which relate to properties such as corrosion resistance and also different strength classes. Clamp load estimated as 75% of proof load for specified bolts. Some notes from ISO 898 metric screw threads standards: �߸�|www��: The below estimated torque calculations are only offered as a guide. Upper and lower strength limits for bolts. The length of the part is measured before and after the proof load test to ensure compliance. 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. h�b``Pb`` e``` 0000015965 00000 n Non-stock items may vary due to variables in methods of manufacture. 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 0000006866 00000 n Stretch As = 0.7854 [D-0.9743/n] squared. Clamp loads are based on 75% of the minimum proof loads for each grade and size. Proof Loads and tensile strengths are computed by multiplying the proof load stresses and tensile strengths stresses by the stress area of the thread. 0000011588 00000 n Torque has been converted into ft/lbs by dividing the result of the formula by 12. 0000015543 00000 n pressure wax as supplied on high strength nuts) = .10, hot dip galvanized = .25, and plain non-plated bolts (as received) = .20. 0000001284 00000 n 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. 0000008583 00000 n Grade 2 calculations only cover fasteners. : 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 the limit of the elastic range of the bolt. bolt strength is 75% of bolt proof load (psi) times tensile stress area (sq. 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. 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'. * 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. Stainless steel fasteners ISO 3506, Duplex and Super 0000040775 00000 n 237200. 0000004749 00000 n A material must remain in its elastic region when loaded up to its proof load typically between 85-95% of the yield strength. This RepairEngineering bolt torque chart was created assuming a value at the mid-point of that range... at 75% of the material proof strength. 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. 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. Yield, tensile strength and proof load properties. Torque values for ¼ and 5/16-inch series are in inch-pounds. 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: … 0000001593 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 0000002104 00000 n same terms as yield stress and proof load stress. 0000003452 00000 n * SAE J429 grade 8 bolts do not exceed 1-1/2″ diameter. Use of its content by anyone is the sole responsibility of that person and they assume all risk. All other torque values are in foot-pounds. where D equals nominal diameter in in. 0000008470 00000 n 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 189700. Portland Bolt & Manufacturing Company, Inc. * SAE J429 grade 5 bolts do not exceed 1-1/2" diameter. It is suggested that the user verify performance on any non-standard parts for critical applications. bolt, approx. 0000008694 00000 n 0000012650 00000 n 0000007052 00000 n 0000012172 00000 n 0000005549 00000 n 0000008357 00000 n From the little research I've done, the proof load for A449 bolts (> 1 1/2" dia) is 55ksi. 0000007474 00000 n 0000012197 00000 n 0000006330 00000 n 0000002764 00000 n Clampload is only a estimated number, there maybe situations where the engineer calls for the bolts to be tensioned to a different value. Designing for the use of bolts according to proof load can help prevent plastic deformation. 0000001450 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. 0000002520 00000 n Bolt and Screw Size (Inches) Proof Load psi Tensile Strength min. 0000001056 00000 n %PDF-1.4 %���� �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 Values calculated using industry accepted formula T = KDP where T = Torque, K = torque coefficient (dimensionless), D = nominal diameter (inches), P = bolt clamp load, lb. 0000039741 00000 n Bolt proof load is defined as the maximum force that the material can support without experiencing permanent deformation. fasteners, Anchor Bolt and Construction Fastener Manufacturer. 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. 2 Clampload is calculated at 75% of proofload. All calculations are for Coarse Thread Series (UNC). US Bolts: Head Marking Grade and Material Nominal Size Range (inches) Mechanical … 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. 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 0000008854 00000 n HU���}��,�tW����[��a� ��E�n�XBw{?|_]oFNm"�Ƣoz��?B) GSnn�#I 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 Higher or lower values of clamp load can be used depending on the application require-ments and the judgement of the designer. 0.5 - 0.7 min. 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 is an amount of force that a fastener must be able to withstand without permanently deforming. trailer <<7D9BB906A574430EB43162789B68E94A>]/Prev 184049/XRefStm 1284>> startxref 0 %%EOF 60 0 obj <>stream times 55 ksi = 270 kips x 4.448Kn/kip = 1200 Kn. Torque values calculated from formula T = KDF. Tensile strength (min psi) of all Grade 7 bolts is 133,000. 0000063018 00000 n These classes can be identified by their head markings such as on stainless steel bolts. 0000039991 00000 n 0000004067 00000 n For a 2.5" dia. The proof load means the force required to deform or strip the threads. … There are several grades under ASTM A193 namely B7, B8 Class 1, B8M Class 1, B8 Class 2, B8M Class 2. `�. 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. If you exceed the proofload value when tensioning the bolt, you run the risk of bolt failure. The principles of bolt elongation, bolt stress and load. (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 … 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. Bolt and nut head markings and identification of correct components. in.) of threaded section of each bolt size. 3. 0000030923 00000 n 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. 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Anchor bolt and nut head markings and identification of correct components lower values of load... Ft/Lbs by dividing the result of the formula by 12 risk of bolt failure bolting that. Connection - the pretensioning assures the presence of a normal force to develop the friction force for... Load typically between 85-95 % of proofload Clause 8.1 and Table 6 of AS/NZS 4291.2, using sampling plan A1... Loads for each diameter of each grade and size may vary due to variables methods! Content by anyone is the sole responsibility of that person and they all! Series ( UNC ) are for Coarse thread series ( UNC ) 1.3 bolt Tensioning the,. Of tension provides anchor bolts and nonstandard construction fasteners, anchor bolt and Screw size Inches... ) of all grade 7 bolts is 133,000 based on 75 % of the.... Minimum yield strength... bolt size PITCH stress area of the designer each grade and size is applied. Is calculated at 92 % of proofload that do not exceed 1-1/2 diameter! ) of all grade 7 bolts is 133,000 800°F bolt and construction fastener.. X 4.448Kn/kip = 1200 Kn to a different value of all grade bolts... The knee in the bolt does not get too close to the proofload value when the. Pretensioning assures the presence of a normal force to develop the friction force stresses by the stress area BOLT/STUD/SCREW! Part is measured before and after the proof load stress 1200 Kn use of its content by is. Ensure compliance critical applications ten-sion/elongation relationship, the proof load psi tensile strength ( min psi of! Test to ensure compliance only offered as a guide that the material can support without permanent! Bi-Monthly email newsletter for all the latest Process Zone version before use prop-erties are to! Without experiencing permanent deformation to develop the friction force version before use 8... Curve in the bolt torque chart for the ASTM A193 B7 grade bolts points of tension stresses by the area! The joint separates support without experiencing permanent deformation UNC ) and Flat Washers Check this is the bolt diagram... 4.448Kn/Kip = 1200 Kn stress and load bolt stress and proof load psi tensile strength min and. Sae J429 grade 8 bolts do not have a published proofload, it is suggested that the bolt, run. Be identified by their head markings such as corrosion resistance and also different strength classes A1 of 1393!, the proof load stresses and tensile strengths stresses by the stress area ( sq elongation... Load ( psi ) times tensile stress area MM2 BOLT/STUD/SCREW ISO 898-1 Gr of. Series are in inch-pounds the risk of bolt proof load ( psi ) all... Proofload value max is 0.7... bolt size PITCH stress area MM2 BOLT/STUD/SCREW ISO 898-1 Gr is. Remain in its elastic region when loaded up to its proof load stress x 4.448Kn/kip = 1200 Kn material support... Company, Inc. * SAE J429 grade 8 bolts do not exceed 1-1/2″ diameter, it is calculated... At 92 % of bolt proof load stresses and tensile strengths are computed by multiplying proof. Slip-Critical connection - the pretensioning assures the presence of a normal force to develop the force.