Prefix Codes

The prefix code is portion of a part number that identifies the basics of the fastener design.  For example:

0HC0250C01500Z5

     The “HC” lets us know that this is a Hex Cap Screw.

1TS0014A01500HWSLZ

     The “TS” lets us know that this is a Tapping Screw.

The following is a list of some of the most common Prefix Codes.

AB  Anchor Bolt          HC  Hex Cap Screw         SP Spirol Pin
CB  Carriage Bolt        HN  Hex Nut               SQ Square Set Screw
CP  Cotter Pin           JN  Jam Nut               TC  Thread Cutting
DP  Dowel Pin            LS  Lag Screw             TK  Tek - Self-Drilling Screw
EB  Eye Bolt             LW  Lock Washer           TS  Tapping Screw
EL  Elevator Bolt        MS  Machine Screw         UB  "U" Bolt
EN  Eye Nut              PT  Prevailing Torq       UD  U Drive Screw
FS  Floor Screw          RD  All-Thread Rod        WS  Wood Screw
FW  Flat Washer          SC  Socket Cap Screw                           

In some part numbers the Prefix Code denotes the vendor or common brand name.  In this example we have taken the Vendor name, abbreviated it and utilized their part number.

MHT0474

The “MHT” lets us know we are talking about Martin Hand Tools.

In this example we have taken a common brand name and abbreviated it as the Prefix Code.

ELC20020

The “ELC” lets us know we are talking about a Electrical part.

Here are a few more examples.