How to Measure Size
How to measure specific types of fasteners:
All Thread Stud vs All Thread Rod:
All Thread Rod is manufactured to basic industrial lengths, usually rolled thread without chamfered ends. Imperial lengths are 3', 6', 10' and 12'. Metric lengths include 1 meter, 2 meter, and 3 meter. All lengths are common to numerous specifications and grades of material. Additional lengths can be specified. An All Thread or Full Thread Stud is cut to any length desired by the Customer and will usually have chamfered ends. Both Rods and Studs are measured end to end.
Bolts and Screws:
For all bolts and screws except countersunk screws, the length is measured from under the head. For countersunk bolts and screws, the length is the overall length (OAL).
Clevis Pins: Measure length from beneath the head. This will be the length of the clevis pin as reflected in the Item Number. For instance, CLP124 is a clevis pin, 1/2" diameter, 4" long (measured from beneath the head). The effective or usable length of the clevis pin is measured from beneath the head to the top of the hole.
Cotter Pins:Measure length from beneath the head.
Flat Head Bolts:Flat head bolts (also called countersunk bolts), are measured on the overall length of the bolt.
Hex Head Bolts:Hex head bolts are measured from under the head to the end of the shank.
O-Rings:
For information on O-Ring sizes, please see our O-Ring Size Reference.
Safety Pins:Order using the diameter and overall length (OAL) and industry #. May be beneficial to call our Help Desk during normal business hours.
Socket Shoulder Screws:Order by the diameter and length of the shaft. The thread size defaults automatically to the next smallest diameter.
U-Bolts:Order using the pipe size the u-bolt will be used to hold.
May be beneficial to call our Help Desk during normal business hours.