Fastener Identifi cation Markings: ASTM, SAE, ISO

1 Fastener Identification Markings: astm , SAE, ISO. Mechanical Properties Identification Fastener Nominal Size Tensile Specification Material Proof Load Yield Strength Grade Mark Description Range (in.) Strength (psi) Min (psi). Min (psi). Low or SAE 1/4 thru Medium 33,000. J429 Grade 1 1-1/2. Carbon Steel 60,000. astm . Bolts, Screws, Low Carbon A307 Grades 1/4 thru 4 . Studs Steel No Grade A&B. Mark Low or 1/4 thru SAE 55,000 57,000 74,000. Medium 3/4 Over 3/4 to J429 Grade 2 33,000 36,000 60,000. Carbon Steel 1-1/2. Medium SAE 1/4 thru Studs Carbon Cold 100,000 115,000. J429 Grade 4 1-1/2. No Grade Drawn Steel Mark astm . AISI 501 80,000 100,000. A193 Grade B5.

2 B5. 1/4 thru 4. astm . AISI 410 85,000 110,000. A193 Grade B6. B6. AISI 4140, 105,000 125,000. astm . 4142, OR 95,000 115,000. A193 Grade B7 1/4 thru 2-1/2. 4105 75,000 100,000. B7 Over 2-1/2. thru 4. astm 105,000 125,000. CrMoVa Over 4 thru 7. A193 Grade 95,000 115,000. Alloy Steel B16 85,000 100,000. B16. astm . AISI 304 . A193 Grade B8. B8. astm . A193 Grade AISI 347 1/4 and larger 30,000 75,000. B8C. B8C. astm . A193 Grade AISI 316 . B8M. B8M. Bolts, Screws, astm . Studs for High- A193 Grade AISI 321 1/4 and larger 30,000 75,000. Temperature B8T. B8T Service Jeff Dutkovic Sales 1 (800) 466-9780 Page 1. Fastener Identification Markings: astm , SAE, ISO.

3 Mechanical Properties Identification Fastener Nominal Size Tensile Specification Material Proof Load Yield Strength Grade Mark Description Range (in.) Strength (psi) Min (psi). Min (psi). astm AISI 304 Strain . A193 Grade B8 Hardened 100,000 125,000. B8 80,000 115,000. 65,000 105,000. 1/4 thru 3/4. astm 50,000 100,000. AISI 347 Strain Over 3/4 thru 1. A193 Grade . Hardened B8C Bolts, Screws, B8C Over 1. Studs for High- thru 1-1/4. Temperature 95,000 110,000. astm Service AISI 316 Strain Over 1-1/4 thru 80,000 100,000. A193 Grade . Hardened 1-1/2 65,000 95,000. B8M. B8M 50,000 90,000. 100,000 125,000. astm . AISI 321 Strain 80,000 115,000. A193 Grade.

4 Hardened 65,000 105,000. B8T. B8T 50,000 100,000. AISI. astm . 4140,4142 or . A320 Grade L7. 4145. L7. astm . A320 Grade AISI 4037 . L7A. L7A. 1/4 thru 2-1/2. astm . A320 Grade AISI 4137 105,000 125,000. L7B. L7B. astm . A320 Grade AISI 8740 . LC7 Bolts,Screws, L7C Studs for Low- Temperature astm Service A320 Grade AISI 4340 1/4 thru 4 . L43. L43. astm . AISI 304 . A320 Grade B8. B8. astm . A320 Grade AISI 347 1/4 and larger 30,000 75,000. B8C. B8C. astm . A320 Grade AISI 321 . B8T. B8T. Jeff Dutkovic Sales 1 (800) 466-9780 Page 2. Fastener Identification Markings: astm , SAE, ISO. Mechanical Properties Identification Fastener Nominal Size Tensile Specification Material Proof Load Yield Strength Grade Mark Description Range (in.)

5 Strength (psi) Min (psi). Min (psi). astm A320.. Grade B8T. B8T. 1/4 thru 3/4. Over 3/4 thru 1. astm A320 Over 1 thru 1/4 and larger 30,000 75,000. Grade B8F 1-1/4. B8F Over 1-1/4 thru 1-1/2. astm A320.. Grade B8M. B8M. astm A320. AISI 304 . Grade B8 Bolts,Screws, B8 Studs for Low- Temperature Service astm A320. AISI 347 . Grade B8C. B8C. 1/4 thru 3/4. Over 3/4 thru 1 100,000 100,000. astm A320 AISI 303or Over 1 thru 80,000 80,000.. Grade B8F 303Se 1-1/4 65,00 65,00. B8F Over 1-1/4 thru 50,00 50,00. 1-1/2. astm A320. AISI 316 . Grade B8M. B8M. astm A320. AISI 321 . Grade B8T. B8T. SAE J429 1/4 thru 1 Over 85,000 92,000 120,000. Grade 5 Medium 1 to 1-1/2 74,000 81,000 105,000.

6 Bolts, Screws, Carbon Steel, 1/4 thru 1 Over Studs Quenched and 85,000 92,000 120,000. 1 to 1-1/2. astm A449 Tempered 74,000 81,000 105,000. Over 1-1/2. 55,000 58,000 90,000. thru 3. Low or Medium SAE J429. Sems Carbon Steel, No. 6 thru 3/8 85,000 120,000. Grade Quenched and Tempered Low Carbon Martensitic SAE J429 Bolts, Screws, Steel, 1/4 thru 1 85,000 92,000 120,000. Grade Studs Quenched and Tempered Jeff Dutkovic Sales 1 (800) 466-9780 Page 3. Fastener Identification Markings: astm , SAE, ISO. Mechanical Properties Identification Fastener Nominal Size Tensile Specification Material Proof Load Yield Strength Grade Mark Description Range (in.) Strength (psi) Min (psi).

7 Min (psi). Medium astm A325 Carbon Steel, 1/2 thru 11-1/8 85,000 92,000 120,000. Type 1 Quenched and thru 1-1/2 74,000 81,000 105,000. A325 Tempered Low Carbon Martensitic astm A325 High Strength Steel, 1/2 thru 1 85,000 92,000 120,000. Type 2 Structural Quenched and A325 Bolts Tempered Atmospheric Corrosion astm A325 Resisting 1/2 thru 11-1/8 85,000 92,000 120,000. Type 3 Steel, thru 1-1/2 74,000 81,000 105,000. A325 Quenched and Tempered astm A354 80,000 83,000 105,000. Grade BB 75,000 78,000 100,000. Alloy Steel, 1/4 thru Bolts, Studs Quenched and 2-1/22-3/4. Tempered thru 4. astm A354 105,000 109,000 125,000. Grade BC 95,000 99,000 115,000. Medium Carbon SAE J429 1/4 thru Bolts, Screws Alloy Steel, 105,000 115,000 133,000.

8 Grade 7 1-1/2. Quenched and Tempered4. Medium SAE J429 Carbon Grade 8 Alloy Steel, Quenched and Bolts, Screws, Tempered 1/4 thru 1-1/2 120,000 130,000 150,000. Studs Alloy astm A354 Steel, Grade BD Quenched and Tempered4. Medium Carbon Alloy or SAE 1041. SAE J429 1/4 thru Studs Modified 120,000 130,000 150,000. Grade 1-1/2. No Grade Elevated Mark Temperature Drawn Steel High Alloy Strength Steel, 1/2 thru 150,000 min astm A490 120,000 130,000. Structural Quenched and 1-1/2 170,000 max A490 Bolts Tempered Medium ISO R898 Bolts, Screws, Carbon Steel, All Sizes thru 33,000 36,000 60,000. Class Studs Quenched and 1-1/2. No Grade Tempered Mark Jeff Dutkovic Sales 1 (800) 466-9780 Page 4.

9 Fastener Identification Markings: astm , SAE, ISO. Mechanical Properties Identification Fastener Nominal Size Tensile Specification Material Proof Load Yield Strength Grade Mark Description Range (in.) Strength (psi) Min (psi). Min (psi). Medium ISO R898 Carbon Steel, 55,000 57,000 74,000. Class Quenched and No Grade Tempered Mark ISO R898. or 85,000 92,000 120,000. Class Bolts, Screws, All Sizes thru Studs 1-1/2. 88 Alloy Steel, Quenched and Tempered ISO R898. or 120,000 130,000 150,000. Class 109. NOTES: 1. astm Specifications: A193 Alloy-Steel Bolding Materials for High-Temperature Service A307 Low-Carbon Steel Externally and Internally Threaded Standard Fasteners A320 Alloy-Steel Bolding Materials for Low-Temperature Service A325 High-Strength Bolds for Structural Steel Joints, Including Suitable Nuts and Plain Hardened Washers A354 Quenched and Tempered Alloy Steel Bolts and Studs with Suitable Nuts A449 Quenched and Tempered Steel Bolts and Studs A490 Quenched and Tempered Alloy Bolts for Structural Steel Joints 2.

10 SAE Specification: J429 Mechanical and Quality Requirements for Externally Threaded Fasteners 3. ISO Recommendations: No. R898 Mechanical Properties of Fasteners Part 1 Bolts, Screws and Studs 4. Grade 7 bolds and screws are roll threaded after heat treatment. Jeff Dutkovic Sales 1 (800) 466-9780 Page 5. Fastener Identification Markings: astm , SAE, ISO. Hardness Rockwell Grade Nominal Size Proof Load Identification Specification Material See Note Range (in.) Stress (ksi) Min Max marking astm A563. 69 B55. Grade 0 1/4 thru astm A563 1-1/2. 90 B68. Grade A. Carbon Steel C32 3, 4. 1/4 thru 1 120. No Mark astm A563 - B69. Grade B Over 1. 105. thru 1-1/2.