BS 4377:1991

This standard BS 4377:1991 Specification for tapping of holes to receive wire thread inserts (ISO metric threads) is classified in these ICS categories:

• 21.060.99 Other fasteners
• 21.040.10 Metric screw threads

This British Standard specifies requirements for:

1. limits of size for tapped holes to accommodate wire thread inserts which provide ISO metric thread sizes from M1.6 (1.6 mm diameter) to M39 (39 mm diameter) inclusive;
2. screwing taps intended to produce holes to the limits of size specified;
3. a gauging system for checking the tapped holes.

NOTE The titles of the publications referred to in this standard are listed on the inside back cover.

Specifies limits of size for tapped holes to accomodate wire thread inserts to provide ISO metric thread sizes from M1.6 (1.6 mm diameter) to M39 (39 mm diameter) inclusive.