BOLT SET SPECIFICATIONS
Grade "A" Standard Flange Bolt Sets from Fort Worth Gasket & Supply consist of bolts that meet specification ASTM A-307 Grade A and nuts tht meet specification ASTM A-563 Grade A.
Grade "B" Flange Bolt Sets meet specification ASTM A-307 Grade B and nuts meet specification ASTM A-563 Grade B.
Gaskets supplied are cut to USA Standard on non-metallic gaskets for pipe flanges (ANSI B16.21) dimensions unless specified otherwise. Import bolts and nuts will be supplied with bolt sets unless otherwide specified by customer when the order is placed.
We also handle Grade 5, Grade 8, Grade A325, 304 & 316 Stainless Steel and brass bolts and nuts.
| Grade Identification Marking | Specification ASTM A307 |
Material |
Nominal Size inch | Tensile Strength ksi | Hardness Rockwell Min | Hardness Rockwell Max |
No Mark |
Grade A | Low or Medium Carbon Steel |
¼ - 4 | 60 Min |
B79 | B100 |
| No Mark | Grade B | Low or Medium Carbon Steel |
¼ - 4 | 60 Min 100 Max |
B69 | B95 |
Nut Specification Information
| Grade Indentification Marking | Specification ASTM 563 |
Material |
Nominal Size inch | Proof Load Stress ksi | Hardness Rockwell Min | Hardness Rockwell Max |
No Mark |
Grade A | Carbon Steel | ¼ - 1-1/2 | 90 | B68 | C32 |
| No Mark | Grade B | Carbon Steel | ¼ - 1 | 120 | B69 | C32 |
No Mark |
Grade B |
Carbon Steel |
>1 - 1-1/2 | 105 | B69 |
C32 |