3 8 Bolt Torque Rating

Astm a307 utilized 75 of 36 000 psi.

3 8 bolt torque rating.

The proof load for a m30 metric bolt grad 8 8 is 337000 n. Recommended bolt torque table size recommended torque. Pressure wax as supplied on high strength nuts 10 hot dip galvanized 25 and plain non plated bolts as received 20. Clamp load calculated as 75 of the proof load when specified by the standard.

Coarse fine coarse fine coarse fine coarse fine coarse fine coarse fine 4 5 2 4 8 4 3. Grade 2 5 and 8 values are for plated bolts. Torque values for 1 4 and 5 16 in series are in inch pounds. Values calculated using industry accepted formula t kdp where t torque k torque coefficient dimensionless d nominal diameter inches p bolt clamp load lb.

3 8 15 17 23 26 33 37 20 22 18 20 16 18 7 16 24 27 37 41 52 58 31 33 29 31 26 27 1 2 37 41 57 64 80 90 43 45 40 42 35 37 9 16 53 59 82 91 115 129 57 63 53 58 47 51. Grade 2 grade 5 grade 8 18 8 s s bronze brass. Tightening torque guide for grade 5 8 hex cap screws this table is based on ifi 5th edition technical data n 12 n 16 using equation 1 and a torque coefficient k 0 20 for non plated steel fasteners and k 0 15 for plated fasteners. The torque required to achieve this force with a dry bolt is calculated to 2022 nm.

1 can be rearranged to express bolt force as.