How to Measure Size
How to measure specific types of fasteners:
Bolts and Screws: Clevis Pins:
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).
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.
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: Safety Pins:
For information on O-Ring sizes, please see our O-Ring Size Reference.
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.
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.