Understanding Common Abbreviations Your Fastener Distributor Uses

Your fastener distributor will offer advice and direction during the design, prototype and manufacturing stages. But you’re bound to come across an array of abbreviations during that communication, dealing with everything from the materials to fastener size, design and a range of other specifications.
Understanding these abbreviations is helpful for OEM staff.

General Abbreviations
ASTM – This designation indicates that the fastener follows a standard developed by the American Society for Testing and Materials.
DIN – This designation indicates that the fastener follows a metric standard developed by the Deutsches Instit fur Normung. These German standards are often used in the automotive industry.
Galv or Galvi – This abbreviation states that the fastener has been galvanized for greater strength.
BR – Stating that the fastener is made of brass.
CR – Stating that the fastener is made of chrome.
S/S – Stating that the fastener is made of stainless steel.
SBR – Stating that the fastener is made of silicon bronze.
Z – Stating that the fastener is made from zinc.
CL – Used for metric fasteners, this abbreviation states the class that the fastener falls under, which specifies the material and strength.
G – Used for US fasteners, this abbreviation states the grade that the fastener falls under.
NC – Used to indicate that the fastener is made with a National Coarse Thread.
NF – Used to indicate that the fastener is made with a National Fine Thread.
Types of Fasteners in Abbreviated Form
BT indicates a Bolt, and is often seen on drawings.
NT or &NT indicates that the fastener must include a Nut.
HHMB indicates a Hex Head Machine Bolt.
HX indicates a Hex fastener.
JMNT is used to indicate Jam Nuts.
LB is used to indicate Lag Bolts and is often followed by a weight measured in pounds.
MB is used to indicate Machine Bolts.
MS is used to indicate Machine Screws, while MSNT is used to indicate Machine Screw Nuts.
SMS indicates a Sheet Metal Screw.
SS indicates a Set Screw, although it may also be used to indicate stainless steel.
WS is used to indicate Wood Screw.
You’ll find common fastener abbreviations on drawings, in specifications and on purchase orders and invoices. Your fastener distributor will translate any terminology that seems confusing, but with knowledge of these abbreviations you should be well on the way to understanding.