ASTM A307 (Bolt)
ASTM A307 2012
| Standard Specification for Carbon Steel Bolts, Studs, and Threaded Rod 60 000 PSI Tensile Strength | |
| Grade | Description |
| Grade A | Bolts, studs, and threaded rod having a minimum tensile strength of 60 ksi and intended for general applications, |
| Grade B | Bolts, studs, and threaded rodA having a tensile strength of 60 to 100 ksi and intended for flanged joints in piping systems with cast iron flanges, |
| Grade C | Replaced by Specification F1554 Gr.36 |
| Suitable Nuts | |
| Fastener Grade and Size | Nut Grade and Style |
| A - 1/4" to 1-1/2" | A - Hex |
| A - Over 1-1/2" to 4" | A - Heavy Hex |
| B - 1/4" to 4" | A - Heavy Hex |
| Chemical Requirements for Grades A and B Bolts, Studs, and Threaded Rod | ||
| Heat Analysis | Product Analysis | |
| Carbon (Max) | 0.29 | 0.33 |
| Manganese (Max) | 1.20 | 1.25 |
| Phosphorus (Max) | 0.04 | 0.041 |
| Sulfur (Max) | ||
| Grade A | 0.15 | A |
| Grade B | 0.05 | 0.051 |
| Hardness Requirements for Bolts, Studs, and Threaded Rod | |||||
| Grade | Length (Inches) | HardnessA | |||
| Brinell | Rockwell B | ||||
| Min | Max | Min | Max | ||
| A | Less than 3 x Dia 3x Dia and longer | 121 | 241 | 69 | 100 |
| --- | 241 | --- | 100 | ||
| B | Less than 3 x Dia 3x Dia and longer | 121 | 212 | 69 | 95 |
| --- | 212 | --- | 95 | ||
| Tensile Requirements for Full-Size Bolts, Studs, and Threaded Rod | ||||||||
| Bolt Size | Threads | Stress Area | Tensile Strength | |||||
| Grade A | Grade B | |||||||
| (min) | (max) | (min) | (max) | |||||
| Inches | Inches | Inches | Ibf | Kn | Ibf | Kn | Ibf | Kn |
| 1/4" | 20 | 0.0318 | 1,900 | 8.45 | 1,900 | 8.45 | 3,180 | 14.15 |
| 5/16" | 18 | 0.0524 | 3,100 | 13.79 | 3,100 | 13.79 | 5,240 | 23.31 |
| 3/8" | 16 | 0.0775 | 4,650 | 20.69 | 4,650 | 20.69 | 7,750 | 34.48 |
| 7/16" | 14 | 0.1063 | 6,350 | 28.25 | 6,350 | 28.25 | 10,630 | 47.29 |
| 1/2" | 13 | 0.1419 | 8,500 | 37.81 | 8,500 | 37.81 | 14,190 | 63.12 |
| 9/16" | 12 | 0.182 | 11,000 | 48.93 | 11,000 | 48.93 | 18,200 | 80.96 |
| 5/8" | 11 | 0.226 | 13,550 | 60.28 | 13,550 | 60.28 | 22,600 | 100.53 |
| 3/4: | 10 | 0.334 | 20,050 | 89.19 | 20,050 | 89.19 | 33,400 | 148.58 |
| 7/8: | 9 | 0.462 | 27,700 | 123.22 | 27,700 | 123.22 | 46,200 | 205.52 |
| 1" | 8 | 0.606 | 36,350 | 161.70 | 36,350 | 161.70 | 60,600 | 269.57 |
| 1-1/8" | 7 | 0.763 | 45,800 | 203.74 | 45,800 | 203.74 | 76,300 | 339.41 |
| 1-1/4" | 7 | 0.969 | 58,150 | 258.67 | 58,150 | 258.67 | 96,900 | 431.05 |
| 1-3/8" | 6 | 1.155 | 69,300 | 308.27 | 69,300 | 308.27 | 115,500 | 513.79 |
| 1-1/2" | 6 | 1.405 | 84,300 | 375 | 84,300 | 375 | 140,500 | 625 |
| 1-3/4" | 5 | 1.90 | 114,000 | 507.12 | 114,000 | 507.12 | 190,000 | 845.20 |
| 2" | 4-1/2 | 2.50 | 150,000 | 667.26 | 150,000 | 667.26 | 250,000 | 1,112.10 |
| 2-1/4" | 4-1/2 | 3.25 | 195,000 | 867.44 | 195,000 | 867.44 | 325,000 | 1,445.73 |
| 2-1/2" | 4 | 4.00 | 240,000 | 1,067.62 | 240,000 | 1,067.62 | 400,000 | 1,779.36 |
| 2-3/4" | 4 | 4.93 | 295,000 | 1,312.28 | 295,000 | 1,312.28 | 493,000 | 2,193.06 |
| 3" | 4 | 5.97 | 358,200 | 1,593.42 | 358,200 | 1,593.42 | 597,000 | 2,655.69 |
| 3-1/4" | 4 | 7.10 | 426,000 | 1,895.02 | 426,000 | 1,895.02 | 710,000 | 3,158.36 |
| 3-1/2" | 4 | 8.33 | 499,800 | 2,223.31 | 499,800 | 2,223.31 | 833000 | 3,705.52 |
| 3-3/4" | 4 | 9.66 | 579,600 | 2,578.29 | 579,600 | 2,578.29 | 966000 | 4,297.15 |
| 3-3/4" | 4 | 11.08 | 664,800 | 2,957.30 | 664,800 | 2,957.30 | 1108000 | 4,928.83 |