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GB/T 20331-2025Machine taper 1��50 pin reamers with parallel shanks (English PDF)

直柄机用1:50锥度销子铰刀

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Issued by

State Administration for Market Regulation

Level / Type

National · Recommended

Issue date

October 31, 2025

Implementation date

May 1, 2026

Scope

GB/T 20331-2025 is the English-translated version of 直柄机用1:50锥度销子铰刀.

GB/T 20331-2025 — Machine taper 1��50 pin reamers with parallel shanks

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Document preview — GB/T 20331-2025

National Standard of the People's Republic of China

ICS: 25.100.30
Classification: J 41
Replacing: GB/T 20331-2006

Issued by: State Administration for Market Regulation

1 Foreword

GB/T 20331-2025 was issued by State Administration for Market Regulation on 31 October 2025 and has been in force since 1 May 2026.

It replaces the earlier edition GB/T 20331-2006.

2 Normative references

GB/T 1442

GB/T 1442-2004 — Driving tenons and sockets for parallel shank tools -- Dimensions

ISO 4203

3 About this standard

Issued by: State Administration for Market Regulation

English translation: about 7 pages

Chinese original: about 10,130 characters

Supersedes the earlier edition GB/T 20331-2006.

4 Classification and status

International classification (ICS): 25.100.30

Chinese Standard Classification (CCS): J 41

Prefix GB/T: recommended standard.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 7 pages — is available in the English PDF.

Referenced standards

Normative references

ISO 4203

Cited by

GB/T 21018-2007Metal cutting tools -- Terms in reamers

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