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美标螺栓不同标准与等级的标识、标记、力学性能与材料
美标螺栓的标识主要分为性能等级标识、制造商 、材料标识和特殊标准标识三类，用于快速识别螺栓的强度、材质与合规性。美标螺栓主要遵循 ASTM 和 SAE 两大体系，标识形式不同但核心都是区分强度等级。以下将以表格形式列出常用标识标记。
| 等级标记 | 等级标准 | 材料 | 公称尺寸 (英寸) | 机械性能 | 洛氏硬度 | |||||
| 最小保证载荷 (ksi) | 最小屈服强度 (ksi) | 最小抗拉强度 (ksi) | 最小延伸率% | 最小断面收缩率% | 最小值 | 最大值 | ||||
 | SAE J429 Grade 1 | 低碳钢或中碳钢 | 1/4“-1-1/2” | 33 | 36 | 60 | 18 | 35 | B70 | B100 |
 | A307 Grade A | 低碳钢或中碳钢 | 1/4" - 4" | - | - | 60 | 18 | - | B69 | B100 |
 | A307 Grade B | 低碳钢或中碳钢 | 1/4" - 4" | - | - | 60 最小值 100 最大值 | 18 | - | B69 | B95 |
 一端涂绿色 | A307 Grade C | 低碳钢或中碳钢 | 1/4" - 4" | - | 36 | 58 最小值 80 最大值 | 23 | - | - | - |
 一端涂蓝色 | F1554 Grade 36 | 低碳钢或中碳钢 | 1/2" - 4" | - | 36 | 58 最小值 80 最大值 | 23 | 40 | - | - |
 一端涂黄色 | F1554 Grade 55 | 低碳钢或中碳钢 | 1/2" - 2" | - | 55 | 75 最小值 95 最大值 | 21 | 30 | - | - |
| 2-1/4"- 2-1/2" | 21 | 30 | ||||||||
| 2-3/4" - 3" | 21 | 30 | ||||||||
| 3-1⁄4" - 4" | 21 | 30 | ||||||||
 | SAE J429 Grade 2 | 低碳钢或中碳钢 | 1/4" - 3/4" | 55 | 57 | 74 | 18 | 35 | B80 | B100 |
| 7/8" - 1-1/2" | 33 | 36 | 60 | 18 | B70 | B100 | ||||
 | A193/A320 Grade B8 Class 1 | SUS304不锈钢 | No Restrictions | - | 30 | 75 | 30 | 50 | - | B96 |
 | A193/A320 Grade B8 Class 2 | SUS304不锈钢 | Up to 3/4“ | - | 100 | 125 | 12 | 35 | - | C35 |
| 7/8”-1“ | 80 | 115 | 15 | 35 | ||||||
| 1-1/8” - 1-1/4“ | 65 | 105 | 20 | 35 | ||||||
| 1-3/8” - 1-1/2” | 50 | 100 | 28 | 45 | ||||||
 | A193/A320 Grade B8M | SUS316不锈钢 | No Restrictions | - | 30 | 75 | 30 | 50 | - | B96 |
 | A193/A320 Grade B8M Class 2 | SUS316不锈钢 | Up to 3/4” | - | 95 | 110 | 15 | 45 | - | C35 |
| 7/8”-1“ | 80 | 100 | 20 | 45 | ||||||
| 1-1/8“ - 1-1/4“ | 65 | 95 | 25 | 45 | ||||||
| 1-3/8“ - 1-1/2“ | 50 | 90 | 30 | 45 | ||||||
 | F3125 Grade A325 Type 1 | 调质处理中碳钢 | 1/2" - 1-1/2" | 85 | 92 | 120 | 14 | 35 | C24 | C35 |
 | F3125 Grade A325 Type 3 | 调质处理耐候钢 | 1/2" - 1-1/2" | 85 | 92 | 120 | 14 | 35 | C24 | C35 |
 | SAE J429 Grade 5 | 调质处理中碳钢 | 1/4" - 1" | 85 | 92 | 120 | 14 | 35 | C25 | C34 |
| 1-1/8“" - 1-1/2" | 74 | 81 | 105 | C19 | C30 | |||||
 | A449 Type 1 | 调质处理中碳钢 | 1/4" - 1" | 85 | 92 | 120 | 14 | 35 | C25 | C34 |
| 1-1/8“" - 1-1/2" | 74 | 81 | 105 | C19 | C30 | |||||
| 1-5/8" - 3" | 55 | 58 | 90 | B91 | B100 | |||||
 | A449 Type 3 | 调质处理耐候钢 | 1/4" - 1" | 85 | 92 | 120 | 14 | 35 | C25 | C34 |
| 1-1/8“" - 1-1/2" | 74 | 81 | 105 | C19 | C30 | |||||
| 1-5/8" - 3" | 55 | 58 | 90 | B91 | B100 | |||||
 | A193 Grade B7 | 调质处理中碳合金钢 | 1/4" - 2-1/2" | - | 105 | 125 | 16 | 50 | - | C35 |
| 2-5/8" - 4" | 95 | 115 | 16 | 50 | C35 | |||||
| 4-1/8" - 7" | 75 | 100 | 18 | 50 | C35 | |||||
 | A354 Grade BC | 调质处理中碳合金钢 | 1/4" - 2-1/2" | 105 | 109 | 125 | 16 | 50 | C26 | C36 |
| Over 2-1/2" | 95 | 99 | 115 | 16 | 45 | C22 | C33 | |||
 一端涂红色 | F1554 Grade 105 | 调质处理中碳合金钢 | 1/2" - 3" | - | 105 | 125 最小值 150 最大值 | 15 | 45 | - | - |
 | A320 Grade L7 | 4140, 4142, 或4145 | 1/4" - 2-1/2" | - | 105 | 125 | 16 | 50 | - | - |
 | A320 Grade L43 | 4340 | 1/4" - 4" | - | 105 | 125 | 16 | 50 | - | - |
 | F3125 Grade A490 Type 1 | 调质处理中碳合金钢 | 1/2" - 1-1/2" | 120 | 130 | 150 最小值 173 最大值 | 14 | 40 | C33 | C38 |
 | F3125 Grade A490 Type 3 | 调质处理耐大气腐蚀钢 | 1/2" - 1-1/2" | 120 | 130 | 150 最小值 173 最大值 | 14 | 40 | C33 | C38 |
 | SAE J429 Grade 8 | 调质处理中碳合金钢 | 1/4" - 1-1/2" | 120 | 130 | 150 | 12 | 35 | C33 | C39 |
