A-A-1041B
March 20, 1989
SUPERCEDING
A-A-1041A
April 28, 1986
COMMERCIAL ITEM DESCRIPTION
STEEL GRIT
The General Services Administration has authorized the use of this
Commercial Item Description in preference to Military Specification
MIL-S-851, type I
This commercial item description covers hardened cast steel grit for use in blast cleaning equipment for general blasting.
Salient characteristics:
1. The grit shall be furnished in sizes G14, G16, G188 G25, G40t G50, and G80 as specified. Grit size shall be determined in accordance with the Society of Automotive Engineers Recommended Practice Cast Shot Anti-grit Size Specification for Peening and Cleaning - SAE 3444’.
2. The grit shall be newly manufactured from virgin or recovered raw materials. The grit shall be free of dust, oil, grease8 corrosion and other contaminants as determined by visual examination. Corroded or rusted grit, except for a slight red rust color shall be considered unacceptable. The grit shall contain less than .2% by weight of non-magnetic contaminants. Non-magnetic contamination shall be determined by separation of all magnetic particles from a sample of grit particles using a magnet and calculation of the percentage by weight of non-magnetic particles remaining in the sample.
3. The grit shall consist of heat treated irregular particles produced by crushing cast steel, and shall contain not more than 5% rounded particles. Particle shape shall be determined by examination of a field of 100 particles placed on a glass slide and viewed at a 4X magnification (care should be taken that half-round or near half-round particles are not counted as rounded particles)e Unless otherwise specified, grit hardness shall be within the range of 40 to 52 on the Rockwell C scale. When other hardness values are desired, the purchaser shall specify a specific grit hardness within a range of Rockwell c30 (soft) to Rockwell C65 (very hard) (see notes).
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Beneficial comments, recommendations, additions, deletions, clarifications, etc. and any data which may improve this document should be sent to: General Services Administration, Industrial Engineering Group (7FXEI), 819 Taylor St., Fort Worth, TX 76102. |
DISTRIBUTION STATEMENT A: Approved for
public release; distribution is unlimited.
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