Forum sponsored by:
Screw thread identification
| Bev Archer | 05/01/2014 18:05:06 |
| 9 forum posts 12 photos | Hi, My first posting on this forum. I'm trying to restore some fairly old model aero engines that I inherited from my dad. The first one I've tackled is a K&B Torpedo 15 and I'm puzzled by the threads on the head and cylinder retaining bolts. They appear to be 7/64" and 40 tpi. I suspect this is a Model Engineer Screw Thread but none of the tables I've looked at go below 1/8". Did American manufacturers use the M.E. thread? Would anybody know what this thread is and is it possible to get taps and die to suit? Bev |
| JasonB | 05/01/2014 18:08:55 |
 25215 forum posts 3105 photos 1 articles | Quite likely 4-40 UNC which is 0.112" dia so allowing for the crests being a bit undersize close to your .109" ( 7/64) below 1/4" dia the US system uses numbers much like the old UK wood screws did. Should be able to get taps OK try here Edited By JasonB on 05/01/2014 18:27:16 |
| Nicholas Farr | 05/01/2014 18:42:43 |
 3988 forum posts 1799 photos | Hi Bev, and here **LINK** Regards Nick. |
| Bev Archer | 06/01/2014 17:38:28 |
| 9 forum posts 12 photos | Many thanks to JasonB & Nick. I've now ordered taps and a die. When I get these engines finished I'll post some photos (when!!) Bev |
Please login to post a reply.
Magazine Locator
Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!
Sign up to our Newsletter
Sign up to our newsletter and get a free digital issue.
You can unsubscribe at anytime. View our privacy policy at www.mortons.co.uk/privacy
Latest Forum Posts
- hemingway ball turner
04/07/2025 14:40:26 - *Oct 2023: FORUM MIGRATION TIMELINE*
05/10/2023 07:57:11 - Making ER11 collet chuck
05/10/2023 07:56:24 - What did you do today? 2023
05/10/2023 07:25:01 - Orrery
05/10/2023 06:00:41 - Wera hand-tools
05/10/2023 05:47:07 - New member
05/10/2023 04:40:11 - Problems with external pot on at1 vfd
05/10/2023 00:06:32 - Drain plug
04/10/2023 23:36:17 - digi phase converter for 10 machines.....
04/10/2023 23:13:48 - More Latest Posts...
- View All Topics
Support Our Partners
Shopping Partners
Subscription Offer
Latest "For Sale" Ads
- Reeves** - Rebuilt Royal Scot by Martin Evans
by John Broughton
£300.00 - BRITANNIA 5" GAUGE James Perrier
by Jon Seabright 1
£2,500.00 - Drill Grinder - for restoration
by Nigel Graham 2
£0.00 - WARCO WM18 MILLING MACHINE
by Alex Chudley
£1,200.00 - MYFORD SUPER 7 LATHE
by Alex Chudley
£2,000.00 - More "For Sale" Ads...
Latest "Wanted" Ads
- D1-3 backplate
by Michael Horley
Price Not Specified - fixed steady for a Colchester bantam mark1 800
by George Jervis
Price Not Specified - lbsc pansy
by JACK SIDEBOTHAM
Price Not Specified - Pratt Burnerd multifit chuck key.
by Tim Riome
Price Not Specified - BANDSAW BLADE WELDER
by HUGH
Price Not Specified - More "Wanted" Ads...
Get In Touch!
Do you want to contact the Model Engineer and Model Engineers' Workshop team?
You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.
Click THIS LINK for full contact details.
For subscription issues please see THIS LINK.
Digital Back Issues
Donate
Register
Log-in
Model Engineer Magazine
- Percival Marshall
- M.E. History
- LittleLEC
- M.E. Clock
ME Workshop
- An Adcock
- & Shipley
- Horizontal
- Mill
Subscribe Now
- Great savings
- Delivered to your door
Pre-order your copy!
- Delivered to your doorstep!
- Free UK delivery!
All Forum Topics > Beginners questions > Screw thread identification