M8 Cap Head Bolt Torque

In general the proper torque spec is usually around 65 70 of the failure torque rate.

M8 cap head bolt torque.

American national standard socket head cap screws metric series per. Tightening torque tensile yield shear strength socket head cap screw socket head cap screw recommended tightening torque class 12 9 size pitch stress area core area tensile strength. When so specified by the purchaser the edges of holes on the outside surface of the head will be chamfered 45 degrees to a depth of 0 30 to 0 50 mm. 2 280nm 123 or 117.

Lubricated bolts and reduced torque lubrication effect on bolt tension and torque. In threads per inch 307a astm a307 grade a sae j429 grade 5 sae j429 grade 8 f n l g 9 fnl grade 9 clamp load lbs tightening. Fasteners bolts nuts and threaded rods torque tension and loads. Steel grade sae 5 sae 8 socket head cap screws property class 8 8 10 9 12 9 socket head cap screw torque in pound foot or pound inch torque in newton meter nm lubed means cleaned dry bolts lubricated with standard medium viscosity machine oil.

Improvised torque wrench improvised torque wrench with luggage scale. Bolt torque calculator calculate required bolt torque. M8 x 1 25 pitch 8 8 25 0 23 0 18 75 17 25. Lubricating the bolts is the suggested method.

Tightening torque for class 4 6 bolts metric coarse bolt diameter x pitch thread stress area mm2 tightening torque nm pre load kn tightening torque nm pre load kn m5 x 0 8 14 2 1 9 2 74 2 59 2 4 m6 x 1 20 1 3 3 3 87 3 65 4 1 m8 x 1 25 36 6 8 7 1 6 7. Proper torque spec varies depending on the material bolt grade or wether lubrication is used such as oil wax or anti seize always go to the manufacturer for proper torque specs if needed. Metric torque chart for hex head cap screws torque chart for stainless steel cap screws size 316 i n c h 18 8 i n c h 10 1 9 6 6 40 12 7 12 1. Lubricate all contact areas of the bolts and washers.

The below chart refers to usage in steel. Torque tension reference guide printed in u s a. Iso 724 metric threads dimensions of metric threads according iso 724. Of the bolt proof loads specified for sae j 429 grade 5 and astm a 449 bolts.

M8 1 25 36 60 32 80 44 65 35 50 24 01 39 8 27 8 m10 1 50 58 00 52 30 70 76 56 26 38 28 78 8 55 1.