This is the special SOHC 13293 M30/M40 7/16" front/middle engine bolt - machined with the correct racing Norton type 'wasted' head, as fitted to M30/Manx Nortons. It has the correct 'reduced' head 0.600" AF hex head, and the set comes complete with correct matching E3238 nut and two washers, all in stainless steel. It is 7/16" diameter shaft
This particular bolt is fitted to magnesium M30 (early Manx type) and post 1948 SOHC M40 Manx t engines.
We CNC machine this bolt in-house from stainless steel. As well as having the correct 'reduced head' 0.600" AF hex that was originally used on these bolts, the head shape profile is the correct racing 'wasted' type profile - i.e. the head is machined concave - looks very pretty and racey!.
It comes complete with the correct 'deep' E3238 engine bolt nut (sold seperately as item 0669), which allows extra spanner purchase to be applied with less risk of stripping threads than with shallower commercially available nuts.
These engine bolts and nuts are CNC machined in-house by ourselves in high quality, non rusting stainless steel. Price is for one bolt, one nut and two washers
See an example of our engine bolts being made on Youtube: https://youtu.be/PHriTiDE5Uc