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post #330 of (permalink) Old 11-10-2017, 12:17 PM
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Join Date: Jul 2011
Location: Cologne, Germany
Posts: 7,193
the one big difference between the two pal nuts above, is the number of teeth: 9 against 6
the 9 tooth (aka. design 4) is for fine thread.
probably why you found it difficult to screw them on

(or THeeth as this site spells it!)
DIN 7967 - Self-locking counter nuts PAL

By time the S4 came along pal nuts were abandoned.

Dom - Alfa Spider 1990 S4 - formerly: Alfa 101 Sprint, 2600 Sprint, Montreal - family classics: Jensen Interceptor II, '58 Hooper RR Silver Cloud I, Shadow II, '60 Corvette.

Last edited by spiderserie4; 11-10-2017 at 12:24 PM.
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