GB/T 20330-2006 Active National standards

GB/T 20330-2006 Drill diameter for use prior to tapping screw threads

GB/T 20330-2006 Drill diameter for use prior to tapping screw threads

Publish Date: 2006-07-20 Implement Date: 2007-01-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

Basic Information

Standard Code: GB/T 20330-2006

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Knives

ICS Name: Drill, reamer, and hobbing cutter

Publish Date: 2006-07-20

Implement Date: 2007-01-01

Pages: 13 pages

Scope

This standard specifies the diameter of twist drills used for drilling before tapping threads with a normal tapping length. The diameter of the twist drill is approximately equal to the nominal diameter (major diameter) of the thread minus the pitch. The listed drill sizes are suitable for the following threads: — Ordinary threads of GB/T 193-2003 (coarse and fine thread series): Tables 1 and 2; — British threads of ISO 263:1973 (UNC and UNF): Tables 3 and 4; — Pipe threads of GB/T 7306.1-2000 and GB/T 7307-2001: Tables 5 and 6.

Development Information

Word Count: 23 Thousand words Pages: 13 pages

Referenced Standards

GB/T 193-2003 General purpose metric screw threads—General plan GB/T 7306.1-2000 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads—Part 1:Parallel internal and taper external threads GB/T 7307-2001 Pipe threads with 55 degree thread angle where pressure-tight joints are not made on the threads ISO 263:1973

Adopt standards

ISO 2306:1972

Related Standards

GB/T 4267-1984 Replaced

GB/T 4267-1984 Rotating tools with parallel shanks—Diameters of shanks and sizes of driving squares

Publish Date: 1984-03-28

GB/T 14299-1993 Replaced

GB/T 14299-1993 Spiral flute drill with indexable inserts

Publish Date: 1993-04-17

GB/T 14332-1993 abolished_transferred

GB/T 14332-1993 Ejector drills with carbide tips

Publish Date: 1993-04-17

GB/T 1438.1-1996 Replaced

GB/T 1438.1-1996 Taper shank twist drills—Part 1:The types and dimensions for Morse taper shank twist drills

Publish Date: 1996-07-05

GB/T 1438.2-1996 Replaced

GB/T 1438.2-1996 Taper shank twist drills—Part 2:The types and dimensions for long Morse taper shank twist drills

Publish Date: 1996-07-05

GB/T 1438.3-1996 Replaced

GB/T 1438.3-1996 Taper shank twist drills—Part 3:The types and dimensions for lengthened Morse taper shank twist drills

Publish Date: 1996-07-05