BS 4183:1967

With ISO metric screw threads to BS 3643, 1 mm to 20 mm diameter. Dimensions, tolerances, mechanical requirements for countersunk, raised countersunk, pan and cheese head screws with slotted heads, and countersunk, raised countersunk and pan head screws with recessed heads. Dimensions, tolerances, general requirements for square and hexagon machine screw nuts (pressed type). Checking recess penetration, dimensioning of 90° countersunk heads, standard sizes. See BS 1981, BS 3692.Cross References:BS 21BS 57BS 350BS 450BS 1580BS 1981BS 2827BS 3155BS 3382 BS 3643:Part 1BS 3643:Part 2BS 3692PD 5686ISO/R 7ISO/DR 949Replaced by BS EN ISO 7045:1994.Incorporates the following:AMD 1742 published 15 May 1975AMD 572 published 15 August 1970AMD 8550 published 15 May 1995