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Specification Marking System for Bonded Abrasives

The specification marking system was developed by the ANSI (American National Standards Institute) to make it easy to identify material specifications in abrasive products like grinding and cut-off wheels.

The naming system incorporates 4 different specifications types in a simple shorthand so it takes up little space, and is fast and easy to read. They are always in order from left to right indicating: Primary Grain Type, Grit Size, Hardness Level and Bonding Material.

Following is an example of how to read a specification marking and a table with the most common specifications for easy reference to aid in understanding these markings.

Specification Marking System Example: A-24-Q-BF

Read it as: [GRAIN (A)]-[GRIT (24)]-[HARDNESS (Q)][BOND (BF)]

This product's grain is Aluminum Oxide; grit is coarse at 24; has a hardness rating of hard, at a Q level, and is bonded together with resin and is also reinforced.

Where the dashes go is arbitrary; the system is arranged so that each section follows the same order with or without the dashes.


ANSI MARKING SYSTEM:
GRAINGRITHARDNESSBOND
A - Aluminum OxideCoarseSoftB - Resinoid
AT or TA - Ceramic Aluminum Oxide14DBF - Resinoid Reinforced
C - Black Silicon Carbide16EE - Shellac
CA or AC - Aluminum Oxide and Silicon Carbide Mixture20FO - Oxychloride
GC - Green Silicon Carbide24GR - Rubber
Z or ZA - Zirconia Aluminum OxideHRF - Rubber Reinforced
MediumMediumS - Silicate
30IV - Vitrified
36J
46K
54L
60M
70N
O
FineHard
80P
90Q
100R
120S
150T
180U
220V
W
X
Y
Z

Last Updated: May 19, 2017
Update History:
May 19, 2017 by bbasile from Calgary Fasteners
May 17, 2017 by bbasile from Calgary Fasteners
May 17, 2017 by bbasile from Calgary Fasteners
May 15, 2017 by bbasile from Calgary Fasteners
Jan 23, 2017 by jsjohnson from Calgary Fasteners
Dec 15, 2016 by jsjohnson from Calgary Fasteners
Dec 15, 2016 by jsjohnson from Calgary Fasteners
Dec 15, 2016 by jsjohnson from Calgary Fasteners
Dec 15, 2016 by bbasile from Calgary Fasteners
Dec 15, 2016 by bbasile from Calgary Fasteners
Dec 15, 2016 by bbasile from Calgary Fasteners
Dec 15, 2016 by bbasile from Calgary Fasteners
Dec 15, 2016 by bbasile from Calgary Fasteners
Dec 15, 2016 by bbasile from Calgary Fasteners
Dec 15, 2016 by bbasile from Calgary Fasteners