GB/T 4390-2008
Wrench openings.Tolerances for general use (English Version)

Standard No.

GB/T 4390-2008

Language

Chinese, Available in English version

Release Date

2008

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Latest

GB/T 4390-2008

Replace

GB/T 4390-1995

Scope

This standard specifies the commonly used tolerances for metric wrench openings and wrench holes shown in Figure 1 (omitted). This standard applies to wrenches and torx wrenches for wrenching bolts, screws and nuts (or similar parts) with metric dimensions across flats.

GB/T 4390-2008 Referenced Document

• GB/T 3103.1 Tolerances for fasteners--Bolts,screws,studs and nuts

GB/T 4390-2008 history

• 2008 GB/T 4390-2008 Wrench openings.Tolerances for general use
• 1995 GB/T 4390-1995 Spanner gaps and sockets--Metric series-tolerances for general use