| Listed in parts books | Not catalogued by year yet |
TAP 5/16X18 BSW PLUG HSS
A 5/16 x 18 BSW plug tap in HSS, used for cutting or cleaning up British Standard Whitworth threads.
This is a 5/16 x 18 BSW plug tap, made from HSS (high speed steel). It's a workshop tool, not a motorcycle part off the bike itself — used for cutting or cleaning up internal threads to the BSW (British Standard Whitworth) 5/16 x 18 spec.
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A plug tap has a long taper on the cutting end, which makes it the one you reach for to start a thread or to run through a hole that's already been tapped and just needs cleaning out or finishing to full depth.
Our record on this one is brief — it's listed plainly as the tap itself with no other catalog history behind it. If you're not sure whether 5/16 x 18 BSW is the thread you're chasing, give the shop a call before you order.
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