| Listed in parts books | Not catalogued by year yet |
TAP 3/8X20 BSF PLUG HSS
A 3/8x20 BSF plug tap in HSS, for cutting or cleaning up British Standard Fine threads of that size.
This is a 3/8x20 BSF plug tap, made from HSS (high speed steel). It's a shop tool rather than a motorcycle part - used for cutting or cleaning up internal threads in the BSF (British Standard Fine) thread standard, in this case 3/8 inch diameter at 20 threads per inch.
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A plug tap has a tapered lead-in that's shorter than a taper tap but longer than a bottoming tap, making it a reasonable general-purpose choice for starting a thread in a hole that isn't blind. If you're chasing old BSF threads on a vintage British bike or cutting new ones from scratch, this is the size and standard to reach for when the fastener calls for 3/8x20 BSF.
We don't have more detail on this one beyond the size and thread standard. Call the shop if you need help confirming this is the right tap for your application.
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