Die query?

[Bo’sunParticipant @bosun58570]

[Bo’sunParticipant @bosun58570]

Good morning,

I've been sorting through some acquired taps and dies and came across a die with the engraving "3/8 x 26 BRASS", made by LAL ltd England. It's a conventional round split steel die.

Too fine for BSF or UNF. Any suggestions what it's for?

[JasonBModerator @jasonb]

Brass thread is a standard thread form. originally used on brass tube wher ethe wall thickness was too thin for a coarse thread.

Edited By JasonB on 29/01/2021 09:52:36

[DC31kParticipant @dc31k]

Please have a read of these threads:

https://www.model-engineer.co.uk/forums/postings.asp?th=170639

https://www.model-engineer.co.uk/forums/postings.asp?th=170798

[Bo’sunParticipant @bosun58570]

Thank you,

Any idea what sort of things would they have been used for?

[Chris Evans 6Participant @chrisevans6]

Posted by Bo'sun on 29/01/2021 10:38:36:

Thank you,

Any idea what sort of things would they have been used for?

Light fittings and some plumbing items.

[Nicholas FarrParticipant @nicholasfarr14254]

Hi Bo'sun, I guess you can use them for anything you like, but as Chris has said, light fittings are typical.

Regards Nick.

[noel shelleyParticipant @noelshelley55608]

A thread system that used 26 tpi for all diameters. Thin walled brass tube, hence the name. A common thread in light fittings now is 10mmX 1.0 Noel

[Howard LewisParticipant @howardlewis46836]

As a footnote, if needed, BSB is a Whit form thread, of 55 degrees.

1/4 BSF happens to coincide by also being 26 tpi.

Cycle Thread (CEI ) also standardises on 26 tpi but is 60 degree form. It does not coincide with any UNF or UNEF size..

Howard

[Bo’sunParticipant @bosun58570]

Thank you Howard.

[Peter Jones 20Participant @peterjones20]

All the information was available in the free 'handbook' pages published in the 90's in MEW.

I still have mine and reference it more frequently than I probably should to make comments on You Tube

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