Join Date: Jul 2011
Location: Cologne, Germany
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.