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KWIL · 19th January 2019, 09:11

The M30 designation is only the nominal diameter, there will always be a tolerance, 29.6 is near enough, do not worry, the top of the thread is always slightly rounded to ensure clearance when fitted..

19th January 2019, 09:11	#2
KWIL Precise Rover 75 Tourer 2.5KV6 Connoisseur SE Join Date: Mar 2013 Location: Fleet Posts: 2,954 Thanks: 630 Thanked 617 Times in 480 Posts	The M30 designation is only the nominal diameter, there will always be a tolerance, 29.6 is near enough, do not worry, the top of the thread is always slightly rounded to ensure clearance when fitted..