## What should a 1/2 bolt be torqued to?

US Recommended Bolt Torque

Size | Recommended Torque | |
---|---|---|

Grade 2 | Grade 8 | |

1/2″ | 37 | 90 |

9/16″ | 53 | 129 |

5/8″ | 73 | 180 |

### How do you find the torque specs on a bolt?

Begin with the formula T = K x U x D x P, where T is the torque, K is a standard representing 1.33, U is the coefficient of friction, D is the diameter of the fasteners, and P is the necessary preload.

**How much torque can a 1/4 bolt take?**

ASTM A449 / SAE Grade 5*

Bolt Size | TPI | Tightening Torque (ft lbs) |
---|---|---|

Plain | ||

1⁄4 | 20 | 8 |

5⁄16 | 18 | 17 |

3⁄8 | 16 | 31 |

**What is the torque for 3/4 a325 bolt?**

TORQUE ASTM A325

Bolt Size | TPI | Tightening Torque Range (ft lbs) (Min-Max) Plain |
---|---|---|

5/8″ | 11 | 198 – 240 |

3/4″ | 10 | 350 – 425 |

7/8″ | 9 | 569 – 685 |

1″ | 8 | 850 – 1,017 |

## How do I check my torque specs?

Mark the tightened fastener and surrounding application. In the tightening direction, begin to slowly apply force to the tool until the first movement in the fastener is noted. The reading recorded is a good indication of the original torque applied to the joint. This is the best way to determine residual torque.

### What is the torque for 3/4 bolt?

Recommended bolt torques.

Size (in) | Torque (lbf ft) | |
---|---|---|

SAE Grade 2 | 18-8 S/S | |

5/8 | 73 | 93 |

3/4 | 115 | 128 |

7/8 | 129 | 194 |