Tensile Strength of a Grade 5 Bolt
| Value | 827,000,000 Pa |
| Status | Conventional / typical value |
| Source | SAE J429 / Machinery's Handbook, 31st ed. |
| Categories | Material PropertiesEngineering & Trade |
| microbar | 8,270,000,000 μbar |
| barye | 8,270,000,000 Ba |
| millitorr | 6,203,010,100 mTorr |
| pascal | 827,000,000 Pa |
| millimeter of water column | 84,330,531 mmH₂O |
| pound per square foot | 17,272,254 lb/ft² |
| centimeter of water column | 8,433,053.1 cmH₂O |
| hectopascal | 8,270,000 hPa |
| millibar | 8,270,000 mbar |
| torr | 6,203,010.1 Torr |
| millimeter of mercury | 6,203,009.2 mmHg |
| inch of water column | 3,320,099.7 in w.g. |
| kilopascal | 827,000 kPa |
| foot of water column | 276,674.97 ft H₂O |
| inch of mercury | 244,212.96 inHg |
| pound per square inch | 119,946.21 psi |
| meter of water column | 84,330.531 m H₂O |
| decibar | 82,700 dbar |
| kilogram-force per square centimeter | 8,433.0531 kgf/cm² |
| bar | 8,270 bar |
| atmosphere | 8,161.8554 atm |
| megapascal | 827 MPa |
| kip per square inch | 119.94621 ksi |
| gigapascal | 0.827 GPa |
| million pounds per square inch | 0.11994621 Mpsi |
Learning zone
SAE Grade 5 — the three-radial-line head marking, medium carbon steel quenched and tempered — is the common automotive and machinery fastener: 120 ksi minimum tensile, 92 ksi yield, 85 ksi proof. Proof strength is the number that matters for preload, because it is the stress the bolt can carry with no measurable permanent set; standard practice targets 75 % of proof for reusable joints and up to 90 % for single-use.
Note that all of these are stresses, and the area they act on is the tensile stress area, not the shank area — a 1/2-13 bolt has 0.1419 in² of stress area against 0.196 in² of shank, so using the nominal diameter overstates capacity by nearly 40 %. Above 1 in diameter Grade 5 drops to 105 ksi tensile, and metric property class 8.8 is the near equivalent (800 MPa tensile, 640 MPa yield). Structural steelwork uses a different family entirely — ASTM F3125 Grade A325 and A490 — and the grades are not interchangeable with SAE fasteners.