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Author Topic: Primary Chaincase Level plug thread  (Read 406 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
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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
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'53 Plunger Flash and Steib S500, ‘66 LE Velocette, ‘53? Winged Wheel

Offline 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.
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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)
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