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Clamp load calculated as 75% of the proof load for socket head cap screws as specified in ASTM A574. Torque values calculated from formula T=KDF, where K = 0.15 for "lubricated" conditions, K = 0.16 "as-received" and K = 0.20 for "dry" conditions
Torque values calculated from formula T=KDF, where K = 0.16 for "lubricated" conditions and 0.35 for "dry" NOTE: USE ASTM F837 CW for 18-8 and 316 stainless steel machine screw estimated torque values.
Below is a list of bolt torques compiles from various machine tool manufacturers. In general the proper torque spec is usually around 65-70% of the failure torque rate. The below chart refers to usage in steel.
For A307 Grade A, 75% of 36,000 PSI is utilized. A193 B7 uses 75% of the yield strength. The prevailing torque lock nut clamp loads are listed at 75% of the proof loads specified for the appropriate grade bolt: Grade C – SAE J429 Grade 8, FNL Grade 9 – FNL Grade 9 bolt, Grade F – SAE J429 Grade 5, Grade G – SAE J429 Grade 8.
Section 1 Fastener Torque Specifications : ... Fastener Torque Specifications 4 SAE and Metric Fastener Torque Specifications SAE Plain and Zinc Plated Hex and Socket Head Cap Screws TORQUE CHART - SAE PLAIN AND ZINC PLATED HEX HEAD AND SOCKET HEAD CAP SCREWS ... 350 : 474.5 . 1 : 8 . 420 : 569.5 . 310 : 420.5 . 640 : 867.5 . 480 : 651 . 12 : ...
The torque values can only be achieved if nut (or tapped hole) has a proof load greater than or equal to the bolt's minimum ultimate tensile strength.
Use the following tables to determine bolt grade and torque specs.
