M8 Cap Head Bolt Torque

The below chart refers to usage in steel.

M8 cap head bolt torque.

In general the proper torque spec is usually around 65 70 of the failure torque rate. Lubricated bolts and reduced torque lubrication effect on bolt tension and torque. Fasteners bolts nuts and threaded rods torque tension and loads. Of the bolt proof loads specified for sae j 429 grade 5 and astm a 449 bolts.

2 280nm 123 or 117. Bolt torque calculator calculate required bolt torque. 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.

Supply part number. M8 x 1 25 pitch 8 8 25 0 23 0 18 75 17 25. Improvised torque wrench improvised torque wrench with luggage scale. Torque tension reference guide printed in u s a.

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. 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. Lubricate all contact areas of the bolts and washers. 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.

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. 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. A m30 12 9 fastener has a maximum tightening torque of 2 280 nm based on a friction coefficient of 0 125 zinc plated maximum torque. American national standard socket head cap screws metric series per.

Resulting maximum pre load for standard hex head bolts and socket head cap screws based on.