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Bolt Measuring Guide

IDEAL BOLT MEASURING TOOLS - For precision measuring we would recommend the use of Digital Vernier Calipers and a Thread Gauge to measure thread pitch.
For standard bolts in the range of M5 – M12, we offer our own Pro-Gauge £5.83

ALL YOU NEED TO KNOW ABOUT BOLTS

MEASURING A FASTENER

Measuring Bolts

Shank Diameter

Also called Major diameter. The diameter of a bolt is the Shank diameter, expressed in millimetres for Metric bolts. Because this is approximately the same as the Major or Thread diameter the thread diameter measurement can be used for fully threaded bolts.

Shank Length

Fastener length is measured from where the material surface is assumed to be, to the end of the fastener. For fasteners where the head usually sits above the surface, the measurement is from directly under the head to the end of the fastener. For fasteners that are designed to be countersunk, the measurement is made from the point on the head where the surface of the material is, to the end of the fastener.

Shank length

Thread Pitch

Metric fasteners are specified with a thread pitch instead of a thread count. The thread pitch is the distance between threads expressed in millimetres (measured along the length of the fastener). For example a thread pitch of 1.5 means that the distance between one thread and the next is 1.5mm. In general smaller fasteners have finer thread so they have lower thread pitch.


Thread Pitch

Note: Not all sizes are available in ALL materials, please refer to relevant material section.

Standard Allen Key Socket Cap Bolts

Standard Allen Key

 

Tapered Socket Cap Bolts

Tapered Socket Cap Bolts

Flanged Hex Head BoltsFlanged Hex Head bolts

Tapered Socket Cap Bolts

Tapered Socket Cap Bolts

 

 

Dome Head/Fairing Bolts

Dome head Bolts

Note: Not all sizes are available in all materials, please refer to relevant material section.

Flat Washers

Flat Washers

 

Drilled Washers

Drilled Washer

 

Countersunk Bodywork Washers

counter sunk bodywork washers

Race Spec Bolts

Race Spec Bolts

 

Race Spec Bodywork Bolts

Race Spec Bodywork Bolts

For PDF version of the measuring guide please click HERE