BS 1580-3:2007
Unified screw threads - Part 3:Screw threads with diameters below 1/4 in - Requirements

Standard No.

BS 1580-3:2007

Release Date

2007

Published By

British Standards Institution (BSI)

Latest

BS 1580-3:2007

Replace

07/30158492 DC-2007 BS 1580-3:1965

Scope

This part of BS 1580 specifies limits of sizes, and tolerances, for single-start, clearance-fit unified screw threads, in inch units with diameters 1/4 below in. This part of BS 1580 specifies unified screw threads from Number 0 (0.060 in diameter) to Number 12 (0.216 in diameter), known as the “numbered sizes” in the following standard series: • a coarse thread (UNC) series; • a fine thread (UNF) series; • for Number 12 threads, an extra fine (UNEF) 32 threads per inch diameter/pitch combination. NOTE Unified screw threads below 1/4 in diameter for attachment purposes and for general use in the aircraft industry are specified in Annex A.

BS 1580-3:2007 Referenced Document

• BS 1981 Specification for unified machine screws and machine screw nuts

BS 1580-3:2007 history

• 2007 BS 1580-3:2007 Unified screw threads - Part 3:Screw threads with diameters below 1/4 in - Requirements
• 1965 BS 1580-3:1965 Specification for Unified screw threads - Diameters below 1/4 in