Clutch Release Arm thread size

[93Bandit]

Hey guys,

I replaced the clutch springs on my '83 850L yesterday, and as I was reassembling everything, I couldn't get the clutch release arm pinch bolt to thread into the arm. Upon closer inspection, a few of the threads on the end of the bolt are deformed. I have a cheap SAE tap and die set, but none of the taps were the correct size.

According to my measurements, the bolt is a M5.8 x 1 diameter and pitch, but all the metric tap charts I'm looking at don't list this size. I've looked on SAE charts as well without success. I'm sure my measurements aren't 100% accurate, but I can't even find something close to that size. The bolt threads are easily salvageable, I just need to find the right size tap and die to chase the bolt threads and clutch arm threads. Does anyone know what size I need? Or what the correct bolt measurements are?

Items #28 and #29 are what I'm referring to https://www.partsoutlaw.com/oemparts...8b4e64c/clutch

Any help is greatly appreciated!

[Gorminrider]

I think its m6 x20mm long. I take this from the part number itself...digits at the end.

[93Bandit]

I think its m6 x20mm long. I take this from the part number itself...digits at the end.

OK that makes sense, it is 20mm long. I think that's right. A chart I'm looking at shows M6 x 1 as a common size, so that must be what I need. Thanks!

[Gorminrider]

I think your measuring was pretty good! but there has to be a tiny it of slack somewhere or the screw would never turn! and the slack probably protects the sharpness of the thread a little too...?

[93Bandit]

Definitely, I know there's a tolerance to allow movement, but I wasn't sure how much. I probably should have just taken a step back and used common sense lol.

[Guest]

Definitely M6x1.0 thread.

[Gorminrider]

well, I only thought of "slack" because of your post! Might be wear too.