GB/T 32535-2016Runouts, undercuts and chamfers for pipe threads (English PDF)

1 Scope

This standard specifies a 55 ° sealing and non-sealing pipe thread (Rp, Rc, R1, R2 and G), 60 ° seal and dry seal pipe thread (NPT, NPSC, NPTF, PTF-SAESHORT, NPSF and NPSI) and metric seals thread (Mc and Mp) ending, from the shoulder, undercuts and chamfer dimensions.

55 ° sealing and non-sealing pipe thread conform (all parts), the provisions of GB/T 7306 and GB/T 7307's; 60 ° seal and dry seal pipe thread conform to the provisions of GB/T 12716 and GB/T 27944; and metric seals thread comply with GB/T 1415's.

This standard applies to pipe thread product design and processing.

2 Normative references

The following documents for the application of this document is essential. For cited documents with dates, only the dated edition applies to this document. For undated references, the latest edition (including any amendments) applies to this document.

GB/T 3 common thread ending, from the shoulder, undercuts and chamfers

GB/T 1415 Metric thread seal

GB/T 7306 (all parts) 55 ° sealing pipe thread

GB/T 7307 55 ° non-sealing pipe thread

GB/T 12716 60 ° sealing pipe thread

GB/T 27944 60 ° dry seal pipe thread

3 Size Code

n --- Number of teeth

P --- Pitch d --- the large diameter cylindrical or conical external thread external thread in the large diameter of the small end

D --- threaded inner cylindrical large diameter or large diameter tapered internal thread in the large end face x --- external thread ending length

X --- ending internal thread length a --- externally threaded length from shoulder

A --- threaded length from shoulder dg --- external thread undercut bottom diameter

Dg --- internal thread undercut bottom diameter g1 --- external thread undercut bottom width g2 --- external thread undercut total width

G1 --- internal thread undercut bottom width r --- arc radius undercut groove bottom and the side of the threaded connection

Arc radius R --- internal thread undercut and groove bottom side connected […]