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  1. STANDARD BOLT IDENTIFICATION MARKINGS. 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 ...

  2. Bolt Grade Markings & Strength Chart - Metric Steel Bolts. Head Marking. Grade/Specification. Material. Proof Load (MPa) Tensile Strength min (MPa) Yield Strength Min (MPa) Hardness Min/Max. Class 4.6. Low or medium carbon steel: 220: 400 (58,000 psi) 240: HRB-67 / HRB-95: Class 5.8. Low or medium carbon steel, quenched and tempered: 380. 520 ...

  3. Within this standard, bolt grades include Grades 1, 2, 5, 5.2, 8, and 8.2, with nominal sizes ranging from ¼ to 1 ½ inches, depending on the specific bolt grade. The mechanical properties of the SAE bolt grades are shown on the chart below.

  4. Specifications — ASTM A563 — Carbon and Alloy Steel Nuts. ASTM A194/A194M — Carbon and Alloy Steel Nuts for Bolts for High Pressure and High Temperature Service. Comprehensive Understanding Of ATSM, SAE, & ISO Grade Markings.

  5. Metric Bolts: Head Marking Class and Material Nominal Size Range (mm) Mechanical Properties ; Proof Load (MPa) Min. Yield Strength (MPa) Min. Tensile Strength (MPa) Class 8.8 Medium carbon steel, quenched and tempered All sizes below 16mm: 580: 640. 800. 16mm - 72mm : 600: 660: 830: Class 10.9 Alloy steel, quenched and tempered

  6. Marking Min. Max. 4.6 Low or medium carbon steel M1.6 - M39 225 240 400 (58,000 PSI) B67 B95 8.8 Medium carbon steel: quenched & tempered M1.6 - M16 580 640 800 (116,000 PSI) C22 C32 M18 - M39 600 660 830 (120,000 PSI) C23 C34 10.9 Alloy steel: quenched & tempered M1.6 - M39 830 940 1040 (150,800 PSI) C32 C39 12.9 Alloy steel: quenched & tempered

  7. Hex Bolt Identification, Markings and Strength Chart. Additonal information on bolts is located at the bottom of the webpage. Note: Some bolts share identical head identification and have significantly different strengths.