Theory Torque

MHH ENGINEERING CO LTD

Theoretical Torque Calculation Metric Threads This calculation is made using the formula contained in the MHH Engineering - Torqueleader catalogue How to use this calculation: 1 Fill in all RED boxes, taking care that the values have the correct unit of measurement. This data can be obtained from the MHH Engineering Catalogue, website or from the relevant British or International standards. 2 Insert the percentage of yield/proof strength to be used in the GREEN box. The default is 90%. This makes allowance for any additional loading that the fastener may receive in service. 3 Read calculated Tightening Torque and Preload in the BLUE box

Thread Type (reference only) Fastener Yield / Proof Stress Pitch Diameter of the thread (D 2) Minor (or root) diameter of the thread. (d3) Pitch of the thread (P) Thread friction coefficient (µH) Underhead coefficient of friction (µH) Outside diameter of the nut bearing surface - A/F size. (DO) Inside diameter of the nut bearing surface - Clearance Dia (Di) % of Yield / Proof Stress Used

Tightening Torque to be applied to the fastener Preload (or clamp force) in the fastener

21 May 2002

M16 8.8 Grade Hex Hd 640 N/mm2 14.7 mm 13.55 mm 2 mm 0.11 0.16 24 mm 17.27 mm 90 %

223.13 N.m 76892 N

MHH ENGINEERING CO LTD

Theoretical Torque Calculation Imperial Threads This calculation is made using the formula contained in the MHH Engineering - Torqueleader catalogue How to use this calculation: 1 Fill in all RED boxes, taking care that the values have the correct unit of measurement. This data can be obtained from the MHH Engineering Catalogue or from the relevant British or International standards. NO TE: This calculation is only suitable for threads with a 60 o thread flank angle. (not Whitworth) 2 Insert the percentage of yield/proof strength to be used in the GREE N box. The default is 90%. This makes allowance for any additional loading that the fastener may receive in service. 3 Read calculated Tightening Torque and Preload in the BLUE box

Thread Type (reference only) Fastener Yield / Proof Stress Pitch Diameter of the thread (D2) Minor (or root) diameter of the thread. (d3) Pitch of the thread (P) Stress Area of the thread Thread friction coefficient (µH)

44800 lbf/in2 0.500 in 0.500 in 1.000 in 0.6418 in2 0.12

Underhead coefficient of friction (µH) Outside diameter of the nut bearing surface - A/F size. (DO) Inside diameter of the nut bearing surface - Clearance Dia (Di)

0.12 1.000 in 1.000 in

% of Yield / Proof Stress Used

90 %

Tightening Torque to be applied to the fastener or Preload (or clamp force) in the fastener

21 May 2002

180.5 lbf.ft 2165.8 lbf.in 21863 lbf

Tightening Torque Sl. No. 1 2 3 4 5 6 7 8 9

Screw Size M3 x 0.5 M4 x 0.7 M5 x 0.8 M6 x 1 M8 x 1.25 M10 x 1.5 M12 x 1.75 M14 x 2 M16 x 2

Kilogram force centimeter Kgf.cm 17 40 81 138 334 663 1160 1840 2870

Receipt for confirmation number 6783119 is attached.

Type of service : Branch Province : Samut Prakan Branch Name Branch Type Sai Luat Road, Samut Full Branch Prakan

Branch Name : Sai Luat Road, Samut Prakan Branch Address 435 Sai Luat Rd. Pak Nam Muang District Samut Prakan 10270 Tel : 0-2387-0133-5, 0-2387-1699, 0-2701-6793-4 Fax : 0-2387-2701

Pound force foot lbf-ft 2 3 6 10 24 48 84 133 200

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