Fastener Identification Markings
| Grade Marking | Specification | Material and Treatment | Nominal Size (In.) | Mechanical Properties | Hardness Rockwell | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Proof Load Min (ksi) | Yield Strength Min (ksi) | Tensile Strength Min (ksi) | Elong % Min [9] | RA % Min [10] | Min | Max | ||||
 |
SAE J429 Grade 1 |
Low or Medium Carbon Steel | 1⁄4" - 11⁄2" | 33 | 36 | 60 | 18 | 35 | B70 | B100 |
 |
A307 Grade A | Low or Medium Carbon Steel | 1⁄4" - 4" | - | - | 60 | 18 | - | B69 | B100 |
 |
A307 Grade B | Low or Medium Carbon Steel | 1⁄4" - 4" | - | - | 60 min 100 max |
18 | - | B69 | B95 |
 One End Green |
A307 Grade C [7] | Low or Medium Carbon Steel | 1⁄4" - 4" | - | 36 | 58 min 80 max |
23 | - | - | - |
 One End Blue |
F1554 Grade 36 | Low or Medium Carbon Steel | 1⁄2" - 4" | - | 36 | 58 min 80 max |
23 | 40 | - | - |
 One End Yellow |
F1554 Grade 55 | Low or Medium Carbon Steel | 1⁄2" - 2" | - | 55 | 75 min 95 max |
21 | 30 | - | - |
| 21⁄4"- 21⁄2" | 21 | 30 | ||||||||
| 23⁄4" - 3" | 21 | 30 | ||||||||
| 31⁄4" - 4" | 21 | 30 | ||||||||
|
SAE J429 Grade 2 [8] |
Low or Medium Carbon Steel | 1⁄4" - 3⁄4" | 55 | 57 | 74 | 18 | 35 | B80 | B100 |
| 7⁄8" - 11⁄2" | 33 | 36 | 60 | 18 | B70 | B100 | ||||
 |
A193/A320 Grade B8 Class 1 |
AISI SS304 Stainless | No Restrictions | - | 30 | 75 | 30 | 50 | - | B96 |
 |
A193/A320 Grade B8M | AISI SS316 Stainless Steel | No Restrictions | - | 30 | 75 | 30 | 50 | - | B96 |
 |
F3125 Grade A325 Type 1 | Medium Carbon Steel, Q & T | 1⁄2" - 11⁄2" | 85 | 92 | 120 | 14 | 35 | C24 | C35 |
 |
F3125 Grade A325 Type 3 | Atmospheric Corrosion Resistant Steel, Q & T | 1⁄2" - 11⁄2" | 85 | 92 | 120 | 14 | 35 | C24 | C35 |
 |
SAE J429 Grade 5 |
Medium Carbon Steel, Q & T | 1⁄4" - 1" | 85 | 92 | 120 | 14 | 35 | C25 | C34 |
| 11⁄8" - 11⁄2" | 74 | 81 | 105 | C19 | C30 | |||||
 |
A449 Type 1 | Medium Carbon Steel, Q & T | 1⁄4" - 1" | 85 | 92 | 120 | 14 | 35 | C25 | C34 |
| 11⁄8" - 11⁄2" | 74 | 81 | 105 | C19 | C30 | |||||
| 15⁄8" - 3" | 55 | 58 | 90 | B91 | B100 | |||||
 |
A449 Type 3 | Weathering Steel, Q & T | 1⁄4" - 1" | 85 | 92 | 120 | 14 | 35 | C25 | C34 |
| 11⁄8" - 11⁄2" | 74 | 81 | 105 | C19 | C30 | |||||
| 15⁄8" - 3" | 55 | 58 | 90 | B91 | B100 | |||||
 |
A193 Grade B7 | Medium Carbon Alloy Steel, Q & T | 1⁄4" - 21⁄2" | - | 105 | 125 | 16 | 50 | - | C35 |
| 25⁄8" - 4" | 95 | 115 | 16 | 50 | C35 | |||||
| 41⁄8" - 7" | 75 | 100 | 18 | 50 | C35 | |||||
 |
A354 Grade BC | Medium Carbon Alloy Steel, Q & T | 1⁄4" - 21⁄2" | 105 | 109 | 125 | 16 | 50 | C26 | C36 |
| 25⁄8" - 4" | 95 | 94 | 115 | 16 | 45 | C22 | C33 | |||
 One End Red |
F1554 Grade 105 | Medium Carbon Alloy Steel, Q & T | 1⁄2" - 3" | - | 105 | 125 min 150 max |
15 | 45 | - | - |
 |
A320 Grade L7 | AISI 4140, 4142, or 4145 | 1⁄4" - 21⁄2" | - | 105 | 125 | 16 | 50 | - | - |
 |
A320 Grade L43 | AISI 4340 | 1⁄4" - 4" | - | 105 | 125 | 16 | 50 | - | - |
 |
F3125 Grade A490 Type 1 | Medium Carbon Alloy Steel, Q & T | 1⁄2" - 11⁄2" | 120 | 130 | 150 min 173 max |
14 | 40 | C33 | C38 |
 |
F3125 Grade A490 Type 3 | Atmospheric Corrosion Resistant Steel, Q & T | 1⁄2" - 11⁄2" | 120 | 130 | 150 min 173 max |
14 | 40 | C33 | C38 |
 |
SAE J429 Grade 8 | Medium Carbon Alloy Steel, Q & T | 1⁄4" - 11⁄2" | 120 | 130 | 150 | 12 | 35 | C33 | C39 |
 |
A354 Grade BD [6] | Medium Carbon Alloy Steel, Q & T | 1⁄4" - 21⁄2" | 120 | 130 | 150 | 14 | 40 | C33 | C39 |
| 25⁄8" - 4" | 105 | 115 | 140 | C31 | C39 | |||||
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