From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Experimental figures for end load produced by torque on a 5/8' nut with 20 threads per inch.
| Identifier | ExFiles\Box 94\1\ scan0110 | |
| Date | 8th April 1935 | |
| X328 To Hdy{William Hardy}: Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}13/KW. 8.4.35. Herewith as promised figures for end load produced by a given torque on a flat seated 5/8" nut having 20 threads per inch. Spanner Torque. Tensile Load in Stud lbs.ft. Tons 60 2.5 70 2.73 80 3.18 90 3.59 100 3.92 110 4.18 120 4.57 125 4.61 You will notice that the efficiency of the mechanism is very low. Experiments carried out on E.38709 stud E.38707 clamp E.38708 nut. Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} | ||