Specification for the tapping of holes to receive wire thread inserts (UNC and UNF threads). Diameters 1 in and over.
STANDARD published on 16.8.1961
Designation standards: BS 3409-1:1961
Publication date standards: 16.8.1961
The number of pages: 20
Approximate weight : 60 g (0.13 lbs)
Country: British technical standard
Category: Technical standards BS
Specifies limits of size for tapped holes to accommodate wire thread inserts to provide thread sizes from 1 in to 11/2 in UNC inclusive and from 1 in to 1 in UNF inclusive. It includes recommendations for general dimensions and limits of size on the threaded portion of screwing taps intended to produce holes to the limits specified, together with details of a recommended gauging system for checking them. Status: Confirmed