Author Topic: Primary Chaincase Level plug thread  (Read 96 times)

Online Billybream

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Primary Chaincase Level plug thread
« on: 24.02. 2020 15:02 »
Trying to find out thread of 15-645, it measures approx. 0.245", one of our threads lists states 5/16 x 26tpi but that's to large.
Can anyone advise, need to source one to replace stripped thread
Many thanks
1960 Super Rocket, owned since 1966, back on the road 2012 after being laid up for 29yrs.

Offline AdrianJ

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Re: Primary Chaincase Level plug thread
« Reply #1 on: 24.02. 2020 16:51 »
I would expect it to be 1/4" Whitworth.
On the plunger it's a 67-1711 BSW 1/4" x 1 5/8"  20tpi according to the wonderful A10 fasteners list from Steve Nott www.stevenott.com/bsatrinbw.htm
This is absolutely invaluable and it looks like his home page no longer works., so it's anybody's guess how long it will be around for.
Adrian
'53 Plunger Flash, Steib S500.


Online A10 JWO

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Re: Primary Chaincase Level plug thread
« Reply #2 on: 24.02. 2020 18:14 »
I got new ones from Draganfly last year, they fitted fine if that helps.

Online JulianS

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Re: Primary Chaincase Level plug thread
« Reply #3 on: 24.02. 2020 19:03 »
15 645 is a common 1/4 x 26 tpi cycle (BSF fits)