What is BS 949-4 - Dimensions for ground thread taps about?
BS 949-4 is the fourth part of the BS 949 multi-series that discusses screwing taps.
BS 949-4 specifies the manufacturing tolerances on the threaded portion of taps for producing the ISO metric threads of tolerance classes 4H to 8H and 4G to 6G as defined in ISO/R 965-I to III (excluding, consequently, classes 7G and 8G considered as usually produced with ground thread taps).
BS 949-4 is valid for the short taps specified in ISO/R 529 as well as for any other kind of ground thread taps with the same diameters and pitches.
Who is BS 949-4 - Dimensions for ground thread taps for?
BS 949-4 on screwing taps is useful for:
- Manufacturers of hardware tools
- Designers of screw taps
- Quality control personnel
Why should you use BS 949-4 - Dimensions for ground thread taps?
Tapping screws eliminate the need for drilled holes, as they are designed to cut their own hole as they are screwed into the materials. Design dimensions play an important role in this function as any major deformation in them could hinder the screwing action of these taps.
BS 949-4 helps you to minimize the risk of these deviations and deformations in the design of ground thread taps by providing you with dimensions and tolerance limits for them. BS 949-4 also provides you with designation and marking guidelines for these taps which help in the identification and traceability of these products.
Overall, the guidelines of BS 949-4 help you design and produce high-quality ground thread taps.