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Author Topic: gearbox cover plate threads  (Read 1245 times)

Offline Slymo

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Re: gearbox cover plate threads
« Reply #15 on: 24.02. 2025 02:13 »
A good trick for a flogged 1/4 bsf or cycle tapped hole is to go 7mm fine. It's 1mm pitch so 25.4 tpi and over a short tapped hole the difference is insignificant. 7mm is close enough to 6.35mm (1/4") as to not stand out to much but will rescue the hole without drilling out to a 5/16".
Pretty sure though that all the cover screws on my machine are 1/4 whit.
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NZ

Online BagONails

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Re: gearbox cover plate threads
« Reply #16 on: 24.02. 2025 11:55 »
I needed to replace a couple of knackered 5/16" x26 TPI nuts today...fat chance thought I but wait what are these? Aha 5/16 UNF which is 24TPI I wonder?... After I'd run a 5/16 x 26 CEI Tap through them - Perfick!  *good3* (non safety critical I hasten to add)
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Ian
59 GF A10
67 Spitfire under resto
2013 kwaka W800 Desert Sled (ex write off)

Nil Desperandum

Offline trevinoz

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Re: gearbox cover plate threads
« Reply #17 on: 24.02. 2025 20:45 »
Ian, you can get as many of those nuts that you want from Classic Fasteners in your neck of the woods.
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Online BagONails

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Re: gearbox cover plate threads
« Reply #18 on: 25.02. 2025 12:25 »
Thanks Trev, yes I know Classic Fasteners, they're great but I only needed a quick two off! (attaching the fuel tank stiffening strap underneath)
Cheers
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Ian
59 GF A10
67 Spitfire under resto
2013 kwaka W800 Desert Sled (ex write off)

Nil Desperandum
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