Oil pipe union thread size

Information relating to the Matchless G80 or AJS Model 18 500cc Heavyweight.
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lyoungman
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Oil pipe union thread size

Post by lyoungman »

Hi, can anyone confirm the larger thread size on the engine oil union, engine side is 1/4 BSP but what size union nut is needed for the other side. Thanks, Les
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lyoungman
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Re: Oil pipe union thread size

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EddieDay
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Re: Oil pipe union thread size

Post by EddieDay »

Les, if noone answers, let me know thread OD and either pitch or TPI and I'll look it up in my thread tables.
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Joker_Bones
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Re: Oil pipe union thread size

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EddieDay
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Re: Oil pipe union thread size

Post by EddieDay »

Russel, does that make it a Unified (UN) thread?
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ajscomboman
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Re: Oil pipe union thread size

Post by ajscomboman »

EddieDay wrote: ↑Sun Sep 10, 2023 10:42 am Russel, does that make it a Unified (UN) thread?
It's a 5/8 x 20 tpi cycle thread same as used on rear wheel spindle, seat lug studs, crank pins etc. :thumbup:
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