bolt tightening torque

Tightening torque to preload a bolt Metric thread : M1 M1.2 M1.6 M2 M3 M4 M5 M6 M8 M10 M12 M14 M16 M20 M24 M30 M36 M42 – 3.6 4.6 4.8 5.6 5.8 6.8 8.8 9.8 10.9 12.9

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These estimated torque values are derived from the standard torque formula Torque = KDF utilizing a standard "free-spinning" nut (non-locknut) with a proof strength equal to or greater than the tensile strength of the bolt. For other applications or questions, email [email protected]

August 2007 Quality Fasteners Since 1935 v.1.5. HEX BOLTS – RECOMMENDED TIGHTENING TORQUE. CLASS 8.8. Size. Pitch Stress Area Core Area.

Metric Steel Bolts – Grades and Property Classes – Metric steel bolts, screws and studs – proof and tensile strength; Threaded Bolt Stress Area – Threaded bolts tensile stress area; Threaded Rods – Loads in Imperial Units – Weight rating of threaded hanger rods ; US Bolts – Tightening Torques – Recommended bolt torques; Whitworth Bolt Torques.

Modal analysis has been performed for increasing bolt tightening torque levels, from 0 to 25 Nm (the nominal value) in steps of 5 Nm. The anchoring bolts have not been changed from the nominal value. Measured FRFs show that there is no effect of bolt preload above 10 Nm tightening torque (figure 6).

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This is done to allow a safety buffer so that the bolt does not get too close to the proofload value. If you exceed the proofload value when tensioning the bolt, you run the risk of bolt failure. Clampload is only a estimated number, there maybe situations where the engineer calls for the bolts to be tensioned to a different value.

Recommended bolt torques.. The tightening torques below are for imperial US bolts with tension. Bolt Torque Calculator · Metric Bolts – Tightening Torques.

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Importantly, SMART WASHER is expected to significantly increase the efficiency of assembly and maintenance operations by reducing the need to manually check the torque level of every single.

The tightening shall be carried out in three or four stages in steps of 30, 50 & 70 percent of the final torque value. At fourth stage again use 70 percentage of the final torque value. For heat exchangers flanges torque values to be 30,70,100 and 100 percent of the final torque value. Where recommended to use hydraulic tensioner for bolt.

RECOMMENDED ASSEMBLY TORQUES SAE Grade 5 Bolts & Screws – UNF Thread Bolt Tension Recommended Corresponding to Assembly 65% of Proof Load Torque lbf lbft 2010 8 3180 17 4840 30 6560 48 8840 74 11240 105 14170 148 20600 258 28100 410 36600 610 41100 771 51600 1075 63200 1448 To convert lbf to kN: Multiply kN by 224.809 To convert lbft to Nm.