What are these taps for?

[Brad93]

Any ideas? Are they whitform?

 

[Brad93]

I have about 25 of the sods!

 

[Brad93]

Another one of the taps featuring the arrowhead.

 

[Brad93]

Oh another one does have, “.450 x 32 Thrds - Whitworth”

 

[Hood]

Probably a special, it was common back in the day. Make a special thread and people had to go to you for parts.

 

[Brad93]

Probably a special, it was common back in the day. Make a special thread and people had to go to you for parts.

Figures, it is plessey after all

 

[MetalMonkey]

The crowsfoot/broadhead marking and RTNF (perhaps Royal Navel Torpedo Factories) could be a clue to their origin and vintage.
Tried checking against a thread gauge?

 

[minimutly]

Oh another one does have, “.450 x 32 Thrds - Whitworth”

.450 dia, 32 tpi? Gun threads would be my guess
Are you selling them?

 

[My Old Landy]

.450 dia, 32 tpi? Gun threads would be my guess
Are you selling them?

I hope he is, I like an unusual thread size! .......it may have to be by pm though

 

[Fastdruid]

Another one of the taps featuring the arrowhead.

View attachment 286160 View attachment 286161

Arrow head is War department.
RGF = Royal Gun Factory possibly?

 

[Brad93]

Arrow head is War department.
RGF = Royal Gun Factory possibly?

Plessey used to make missile components and torpedoes

 

[Brad93]

The crowsfoot/broadhead marking and RTNF (perhaps Royal Navel Torpedo Factories) could be a clue to their origin and vintage.
Tried checking against a thread gauge?

You’re probably bang on the money plessey used to make torpedoes

 

[minimutly]

Arrow head is War department.
RGF = Royal Gun Factory possibly?

Guns were ROF...

 

[James1979]

Plessey used to make missile components and torpedoes

That’s the bit my dad was involved with. I’ve nothing from that time of his that really gives much away I’m afraid but I’d think the above is pretty spot on

 

[Fastdruid]

Guns were ROF...

Depends *when* you're talking about. https://www.gracesguide.co.uk/Woolwich_Arsenal

> 1716 The Royal Gun Factory, Woolwich, – formerly the Royal Brass Foundry for the manufacture of brass ordnance – was established.

Of course it could also be "Royal Gunpowder Factory" https://www.gracesguide.co.uk/Royal_Gunpowder_Factory

 

[Brad93]

Royal gunpowder mills has a great small gauge track that a team of volunteers are restoring