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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. Clamp load calculated as 75% of the proof load when specified by the standard.
SAE Grade 5 & 8 Bolts & Screws – 1” SAE. Bolt Tension Corresponding to 65% of Proof Load. Recommended Assembly Torque. Diameter 1” SAE. Threads Per Inch (TPI)
BOLT LOAD (LBS) REQUIRED TORQUE (N -m) (To convert to ft/lbs multiply these torque values x .7376) TORQUE GUIDE FOR ISO R898 CLASS 10.9 MINIMUM YIELD 940 136338 p.s.i. BOLT LOAD BASED ON 80 0.1 M20x2.5 30 245 184 41,385 401 368 460 515 552 578 736 1,105 368 M22x2.5 32 303 228 51,292 547 502 627 703 753 788 1,004 1,506 502
This chart displays a complete list of STV ISO 898 Grade 10.9 dimensions.
Use Prevailing Torque All-Metal Nut chart if using this style of nut. = Nominal Diameter. = Clamp Load For J429 Grade 5 and 8, FNL Grade 9, A574, Class 4.6, 8.8, 10.9 and 12.9, the clamp loads are listed at 75% of the proof loads specified by the standard. For A307 Grade A, 75% of 36,000 PSI is utilized.
Fasteners Recommended Assembly Torques - Class 8.8 Property class 8.8 High Tensile Bolts, ISO Coarse Series Threads AS 1110.1 RECOMMENDED ASSEMBLY TORQUES [ ) Sizes not covered in standard. Data for sizes above this is given for information only.
The importance of correct bolt tightening cannot be over emphasized. Determining the correct torque can however present problems. Approximately 90% of the applied torque is employed in overcoming friction, 50% at the bearing face of the nut and 40% between the mating threads.
