GB/T 18685-2017 Active National standards

GB/T 18685-2017 The blank diameters for rolling general purpose metric screw threads

Publish Date: 2017-09-29 Implement Date: 2018-04-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

Basic Information

Standard Code: GB/T 18685-2017

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Basic standards and general methods

ICS Name: \nThread Composite

Publish Date: 2017-09-29

Implement Date: 2018-04-01

Pages: 9 pages

Scope

This standard specifies the diameter dimensions of blanks before cold heading and rolling of ordinary threads. The nominal diameter range of ordinary threads is 1 mm to 52 mm (diameters of series 1 and 2; the maximum pitch is 4 mm); the thread tolerances include four grades: 4h, 6h, 6g, 6f, and 6e. This standard applies to ordinary threads made from carbon steel and alloy steel materials using the full-tooth extrusion process. Note: The "full-tooth extrusion process" refers to a processing method in which the thread material completely fills the tooth bottom space of the tool during thread extrusion forming.