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you use a spanner to open a rusted nut bolt because you need a strong tool to open a rusted nut bolt.
1.5d+ 1 or 2, where d is the bolt size
spanner
Bolt Pattern: 5x114.3
What are the head bolt torque specs for a mazda mx3 1600
The hexagonal head is easy for a spanner/wrench to get a firm hold on.
whar are the torque specs for head bolt on a 1999 Mazda protege 1.6 engine
Bolt pattern is 5x114.3
The effective diameter of the bolt defines the size of the bolt head. Hence the size of the spanner or wrench that fits the bolt. There are certain exceptions but these are usually specialist applications.
5X114.3
The bolt pattern is 5 x 114.3
a hex bolt is bolt having six face head operated by spanner. an allen bolt is bolt having a six face groove in the head and operated by a special type of L shape key called allen key.