GB/T 32537-2016Runouts, undercuts and chamfers for trapezoidal and buttress threads (English PDF)

1 Scope

This standard specifies the trapezoidal thread (Tr) and serrated thread (B) ending, from the shoulder, undercuts and chamfer dimensions. (All parts) of the trapezoidal thread screw and serrated conform to GB/T 5796 (all parts) and GB/T 13576 regulations.

This standard applies to trapezoidal thread screw and serrated 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 5796 (all parts) trapezoidal thread

GB/T 13576 (all parts) zigzag (3 °, 30 °) Thread

3 Size Code

P --- Pitch d --- external threads of the large diameter (nominal diameter)

D --- threaded large diameter (nominal diameter) 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

4 external thread