0000001056 00000 n Some notes from ISO 898 metric screw threads standards: bolt strength is 75% of bolt proof load (psi) times tensile stress area (sq. 0000008854 00000 n 0000006866 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. is 0.5 and max is 0.7 ... BOLT SIZE PITCH STRESS AREA MM2 BOLT/STUD/SCREW ISO 898-1 Gr. Stainless steel fasteners can be made to different grades which relate to properties such as corrosion resistance and also different strength classes. Proof load is an amount of force that a fastener must be able to withstand without permanently deforming. 0000012172 00000 n Torque has been converted into ft/lbs by dividing the result of the formula by 12. 0000002764 00000 n times 55 ksi = 270 kips x 4.448Kn/kip = 1200 Kn. Product Specifications ASPEN FASTENERS Stainless Steel Tel. Tensile Strength is the maximum tension applied as loading that a fastener can support prior to (or coincidental with) its fracture. 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 All other torque values are in foot-pounds. 0000063018 00000 n 0000002104 00000 n 0000007474 00000 n … 0000012197 00000 n 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``` 0000006330 00000 n 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. 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. Designing for the use of bolts according to proof load can help prevent plastic deformation. Details of common bolting specifications. Stainless steel fasteners ISO 3506, Duplex and Super 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 0000008583 00000 n in.) K values: waxed (e.g. 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. These prop-erties are used to calculate the proof load and breaking load for each diameter of each grade or class of product. This is done to allow a safety buffer so that the bolt does not get too close to the proofload value. 1 Proofload is the published number that full size headed bolts are tested to. `�. For bolting specifications that do not have a published proofload, it is usually calculated at 92% of minimum yield strength. Torque values calculated from formula T = KDF. Bolt proof load is defined as the maximum force that the material can support without experiencing permanent deformation. 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 PROOF LOAD The point to which a material may be stressed without evidence of permanent deformation. 0000039991 00000 n 0000015210 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. 3. 0000008357 00000 n 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. … The length of the part is measured before and after the proof load test to ensure compliance. Upper and lower strength limits for bolts. (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 … A material must remain in its elastic region when loaded up to its proof load typically between 85-95% of the yield strength. 0000011588 00000 n Yield, tensile strength and proof load properties. 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. 0000030923 00000 n 0000031176 00000 n It is suggested that the user verify performance on any non-standard parts for critical applications. 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 237200. 0000011870 00000 n Technical Specification for Hexagonal Bolts, Nuts, Coach Screws and Flat Washers Check this is the latest Process Zone version before use. 0000002520 00000 n 2 Clampload is calculated at 75% of proofload. If you exceed the proofload value when tensioning the bolt, you run the risk of bolt failure. From the little research I've done, the proof load for A449 bolts (> 1 1/2" dia) is 55ksi. 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. Coarse thread series ( UNC ) of proofload is 75 % of proof... Is measured before and after the proof load stresses and tensile strengths are computed by multiplying the proof load be... 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