M8 Cap Head Bolt Torque

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.

M8 cap head bolt torque. 2 280nm 123 or 117. Lubricated bolts and reduced torque lubrication effect on bolt tension and torque. The below chart refers to usage in steel. Of the bolt proof loads specified for sae j 429 grade 5 and astm a 449 bolts.

Torque tension reference guide printed in u s a. Fasteners bolts nuts and threaded rods torque tension and loads. American national standard socket head cap screws metric series per. 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.

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. 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. M8 x 1 25 pitch 8 8 25 0 23 0 18 75 17 25. Lubricating the bolts is the suggested method.

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. Improvised torque wrench improvised torque wrench with luggage scale. Supply part number. In general the proper torque spec is usually around 65 70 of the failure torque rate.

Bolt torque calculator calculate required bolt torque. Resulting maximum pre load for standard hex head bolts and socket head cap screws based on. 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. Lubricate all contact areas of the bolts and washers.

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.