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GB/T 20330-2006Drill diameter for use prior to tapping screw threads (English PDF)

攻丝前钻孔用麻花钻直径

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Issued by

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

Level / Type

National · Recommended

Issue date

July 20, 2006

Implementation date

January 1, 2007

Scope

GB/T 20330-2006 is the English-translated version of 攻丝前钻孔用麻花钻直径.

GB/T 20330-2006 — This standard specifies the pre- tap -tapping screwing length for normal drilling twist drill diameter. Twist diameter approximately equal to the nominal diameter (large diameter) minus the pitch.

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Document preview — GB/T 20330-2006

National Standard of the People's Republic of China

ICS: 25.100.30
Classification: J 41

Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

What this standard covers1
Document data2
Standards quoted by this document3

What this standard covers

This standard specifies the pre- tap -tapping screwing length for normal drilling twist drill diameter. Twist diameter approximately equal to the nominal diameter (large diameter) minus the pitch. Drill dimensions listed apply to the following thread: GB/T 193-2003 common thread (coarse and fine pitch series): Table 1 and Table 2, inch thread (UNC and UNF) ISO 263

Document data

International classification (ICS): 25.100.30.

Chinese classification (CCS): J41.

Estimated length of the Chinese original: 14,119 words.

Adopted international standard: ISO 2306-1972, MOD.

Standards quoted by this document

GB/T 193-2003; GB/T 7306.1-2000; GB/T 7307-2001; ISO 263-1973

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 9 pages — is available in the English PDF.

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