What size tapping drill

What size tapping drill

This topic has 7 replies, 6 voices, and was last updated 2 June 2012 at 15:25 by Russell Eberhardt.

Viewing 8 posts - 1 through 8 (of 8 total)

Author

Posts
1 June 2012 at 16:10 #91889
Eric Cox
Participant
@ericcox50497
What is the tapping size for ME thread 1/2" x 32 tpi.
Advert

1 June 2012 at 16:10 #6176
Eric Cox
Participant
@ericcox50497
1 June 2012 at 16:17 #91892
Alain Faget
Participant
@alainfaget92863
Eric

Drill 12mm for this 1/2 32 tpi

Alain
1 June 2012 at 16:21 #91893
NJH
Participant
@njh
Harold's Metalwork Data Book and Tubal Cain's Model Engineer's Handbook both show 12mm

N
1 June 2012 at 16:37 #91895
Eric Cox
Participant
@ericcox50497
Cheers, I saw it as 12mm in Harold's Metalwork Data Book but thought 12mm was a bit big for a 1/2" thread.
1 June 2012 at 18:42 #91906
_Paul_
Participant
@_paul_
It might seem big but 32TPI is quite a shallow thread.

Paul
1 June 2012 at 22:37 #91931
Robert Dodds
Participant
@robertdodds43397
Eric,

Just be sure your 12mm drill doesn't cut oversize!

Bob D
2 June 2012 at 15:25 #91971
Russell Eberhardt
Participant
@russelleberhardt48058
Just be sure your 12mm drill doesn't cut oversize!

Start with a small drill and open up in stages to 11 mm before finishing with your 12 mm drill. The hole diameter will be accurate enough then.

Russell.
Author

Posts

Viewing 8 posts - 1 through 8 (of 8 total)

Please log in to reply to this topic. Registering is free and easy using the links on the menu at the top of this page.

Code of Conduct

Latest Replies

Viewing 25 topics - 1 through 25 (of 25 total)

- Topic
- Voices
- Posts
- Last Post
- QCTP
  Started by: James A in: Workshop Tools and Tooling
- 11
- 12
- 13 July 2026 at 15:35
  Vic
- Martin Cleeve Swing Clear Retracting Toolholder 1 2
  Started by: Roger Harvey in: Workshop Tools and Tooling
- 18
- 27
- 13 July 2026 at 15:21
  ega
- Boiler problem
  Started by: Zan in: Help and Assistance! (Offered or Wanted)
- 5
- 8
- 13 July 2026 at 14:25
  Zan
- First Printer
  Started by: vintagengineer in: 3D Printers and 3D Printing
- 7
- 8
- 13 July 2026 at 13:47
  John Haine
- Small electromagnetic pump via E-Bay
  Started by: Clive Foster in: Manual machine tools
- 5
- 7
- 13 July 2026 at 12:12
  John Hinkley
- Pipe Size Puzzle.
  Started by: Nigel Graham 2 in: Locomotives
- 5
- 6
- 13 July 2026 at 11:46
  duncan webster 1
- Myford VMC Spindle Advice Please. 1 2
  Started by: Nigel Graham 2 in: Manual machine tools
- 12
- 46
- 13 July 2026 at 10:29
  Graham Meek
- Mini-lathe parts source
  Started by: Dunc in: General Questions
- 7
- 12
- 13 July 2026 at 08:28
  Dell
- Smart & Brown model A spindle lock
  Started by: old mart in: Workshop Tools and Tooling
- 2
- 7
- 12 July 2026 at 20:54
  old mart
- Cleaning years of nicotine exposure and some touch ups
  Started by: rumz in: Traction engines
- 5
- 6
- 12 July 2026 at 18:00
  Georgineer
- pitman arm
  Started by: martin haysom in: General Questions
- 6
- 8
- 12 July 2026 at 17:53
  martin haysom
- 1930 Austin 12 with 3rd brush dynamo
  Started by: john fletcher 1 in: General Questions
- 15
- 23
- 12 July 2026 at 12:00
  Howard Lewis
- Lathe coolant applicators 1 2
  Started by: lucerne in: Manual machine tools
- 16
- 29
- 12 July 2026 at 11:41
  Charles Lamont
- Metal saw
  Started by: Speedy Builder5 in: Workshop Techniques
- 4
- 4
- 12 July 2026 at 10:25
  martin haysom
- SmallRig Cheese Plate
  Started by: Michael Gilligan in: Workshop Tools and Tooling
- 4
- 10
- 12 July 2026 at 10:05
  Michael Gilligan
- Bridgeport Series 1 CNC 1 2 3
  Started by: tomcnc in: CNC machines, Home builds, Conversions, ELS, automation, software, etc tools
- 12
- 56
- 12 July 2026 at 08:11
  seemack
- What Did You Do Today 2026 1 2 … 5 6
  Started by: JasonB in: The Tea Room
- 41
- 138
- 12 July 2026 at 01:00
  Nigel Graham 2
- Another what’s this thread….
  Started by: Hollowpoint in: General Questions
- 6
- 9
- 11 July 2026 at 23:48
  Nigel Graham 2
- What is this?
  Started by: Sonic Escape in: General Questions
- 16
- 24
- 11 July 2026 at 22:45
  Paul Mills 4
- Air con cost?
  Started by: Ian Parkin in: The Tea Room
- 7
- 8
- 11 July 2026 at 19:34
  Mark Rand
- Impending collapse in NYC
  Started by: Michael Gilligan in: The Tea Room
- 12
- 23
- 11 July 2026 at 17:08
  Michael Gilligan
- Optimum products? 1 2 3
  Started by: Alan Ambrose in: Manual machine tools
- 24
- 53
- 11 July 2026 at 13:57
  Adam Harris
- Spindle/bearings fit query for X2 type mill 1 2 3
  Started by: fingerscrossed in: Manual machine tools
- 14
- 53
- 11 July 2026 at 12:34
  Dave Halford
- Hole Sizes
  Started by: John Purdy in: 3D Printers and 3D Printing
- 6
- 12
- 11 July 2026 at 10:03
  JasonB
- Cotton-covered flex
  Started by: Kiwi Bloke in: Materials
- 9
- 10
- 10 July 2026 at 20:03
  howardb

Viewing 25 topics - 1 through 25 (of 25 total)

View full reply list.

Latest Issue

July 2026

Buy Latest/Back Issues

Newsletter Sign-up

Latest Replies