Upper arm grease nipple thread

[Charlynsane]

Hello Guys

I have a Brocken grease nipple in my upper arm

Does anyone know the exact thread?

I suppose it's 1/4 UNF? but I read somewhere it was 1/8 BSP?

Thank you

Charles

[Peter Laidler]

1/4" UNF, same as the others. Cleaned out plenty of 'em and drilled and tapped plenty for the rear rad arm inner nipple modification too. But the BAD news for the upper arm nipples breaking off is that there is(?) insufficient depth behind the broken off nipple shaft to insert a left hand 'easy-out'.

[Charlynsane]

Hello Peter

The grease nipple is 1/4 une but the thread on the upper arm is BSP?

is it 1/4UNF 24, 1/4 UNF 28 or 1/4 UNF 32?

Thank you

[mk1]

1/4 x 28TPI UNF