## What are the torque specs for bolts?

Recommended bolt torques.

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

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

5/16 | 8 | 11.8 |

3/8 | 15 | 22 |

7/16 | 24 | 33 |

### What is the torque for a 12mm bolt?

Metric Recommended Bolt Torque

Bolt Diameter (mm) | Recommended Torque (Nm) | |
---|---|---|

Class 8.8 | Class 10.9 | |

10 | 55 | 75 |

12 | 100 | 135 |

14 | 160 | 215 |

#### What is the torque spec for 1/4 20 bolt?

Tightening Torque Guide for Grade 5 & 8 Hex Cap Screws

GRADE 5 | ||
---|---|---|

Coarse Thread | ||

1/4-20 (.250) | 2025 | 76 in lbs. |

5/16-18 (.3125) | 3338 | 13 ft lbs. |

3/8-16 (.375) | 4950 | 23 ft lbs. |

**How do you calculate torque of a screw?**

The basic formula T = K x D x P stated earlier takes these factors into account and provides users with a starting point for establishing an initial target tightening torque.

**What is the torque on a 10 mm bolt?**

For bolts with a 10mm Thread Diameter: 25Nm.

## 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 |

### What is the torque for 1/4 bolt?

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 |

#### How much torque can a 1/2 inch bolt take?

ASTM A449 / SAE Grade 5*

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

Galv+Waxed | ||

1⁄2 | 13 | 38 |

9⁄16 | 12 | 54 |

5⁄8 | 11 | 75 |

**What are the recommended torques for metric bolts?**

Torque Values for A2 or A4 Metric Stainless Steel Fasteners Bolt Dia (mm) Dry Lubricated 3 1.0 0.9 8.9 in-lbs. 8.0 in-lbs. 4 2.6 2.3 23.0 20.7 5 5.1 4.6 45.1 40.6 6 8.7 7.8 77.0 69.3 8 21.2 19.1 188 169 10 42 38 372 335 12 73 66 54 ft-lbs. 48 ft-lbs. 14 118 106 87 78 16 180 162 133 119 18 258 232 190 171 20 370 333 273 246 22 485 437 358 322 24

**What are the torque specifications for a metric bolt?**

– Capturing bearing races in housings – Setting preload on certain types of bearings – Smaller size bolts which can be easily over torqued. – Bolts in soft materials such as aluminum Example-hydraulic manifolds – Any housing or thin wall material that has a chance to be distorted if over tightened or an uneven torque is applied.

## What is the maximum bolt torque?

Bolt Size TPI Tension (lbs) Tightening Torque Range (ft lbs) (Min – Max) Min Max Plain Lubricated; 1 ⁄ 2: 13: 15,000: 18,000: 125 – 150: 63 – 75: 5 ⁄ 8: 11: 24,000: 29,000: 250 – 302: 125 – 151: 3 ⁄ 4: 10: 35,000: 42,000: 438 – 525: 219 – 263: 7 ⁄ 8: 9: 49,000: 59,000: 715 – 860: 357 – 430: 1: 8: 64,000: 77,000: 1,067 – 1,283: 533 – 642: 1 1 ⁄ 8: 7: 80,000: 96,000: 1,500 – 1,800: 750 – 900: 1 1 ⁄ 4: 7: 102,000: 122,000: 2,125 – 2,542

### How to calculate torque to tighten bolts?

– T Target tighten torque (the result of this formula is in inch pounds, dividing by 12 yields foot pounds – K Coefficient of friction (nut factor), always an estimation in this formula – D Bolts nominal diameter in inches – P