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Common Nuts and BoltsNut & Bolt FAQ.
The types of nuts and bolts found on Mk1 Volkswagens fall into 5 categories.
HEX - This is the standard six (6) sided nut or bolt everyone
is familiar with. The bolt comes in an internal and external
style. The internal come in 3 flavors; standard, shallow head
and RIBE CS (which is similar to the shallow head bolt but has
a guide hole in the center). Size is determined by flat to flat
measurement of the bolt head. International standards now
require size to be printed on the head of the bolt. (Don't
confuse the size with the hardness rating on earlier bolts.)
Common sizes: 3, 5, 6, 8, 10, 12, 14, 17, 19, 22, 24, 27, 30,
32, 36, 41, 42, 46, 50, 55 & 65mm
XZN - Sometimes called a double hex or aircraft bolt this is a
TWELVE (12) sided internal bolt which is commonly seen in CV
joints and headbolts of water cooled VWs. Size is determined by
diameter of the bolt.
Common sizes: 3, 5, 6, 8, 10, 12 and 14mm
RIBE CV - This is a six internal star bolt with flat tips to
the stars. This bolt is no longer in common use but will be
found on older brake assemblies and body connecting bolts. Size
is determined by point to point of the star points.
Common sizes: 5, 6, 8 and 10mm.
TORX - This is a six (6) sided internal (male) and external
(female) bolt with pointed tips on the stars. This was designed
by some folks for GM/Ford and has become popular in foreign
cars for mounting applications such as head bolts, transmission
mounts and body parts. Sizes are determined by using a guide
template or experience.
Common sizes:
Male: T6,T7, T8, T9, T10, T15, T20, T25, T27, T30, T40, T45, T50,
T55, T60.
Female: E4, E5, E6, E7, E8, E10, E11, E12, E14, E16, E18, E20, E24
SHEAR BOLTS - These are single use bolts used in applications
such as SRS sensor mounts, some airbag mounts and other safety
application where the replacement of the bolt is necessary
during repair. They are generally installed with special
application sockets and ablated (cut-off) to remove.
There are no common sizes.
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