| MRC | Criteria | Characteristic |
|---|---|---|
| AAGR | CROSS-SECTIONAL SHAPE STYLE | BLANK RECTANGULAR |
| ABMW | PERIPHERAL SHAPE STYLE | HEXAGON |
| ABMX | CENTER HOLE SHAPE STYLE | ROUND |
| ASDB | WIDTH ACROSS FLATS | 0.250 INCHES NOMINAL |
| FEAT | SPECIAL FEATURES | WEIGHT PER 100 0.236 POUNDS; THREAD SIZE 4-40 UNC-2B; PART NAME ASSIGNED BY MANUFACTURER SPACER, HEX, THREADED |
| MATT | MATERIAL | ALUMINUM ALLOY 2011 OVERALL |
| MDCL | MATERIAL DOCUMENT AND CLASSIFICATION | QQ-A-225/3 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| SFTT | SURFACE TREATMENT | CHROMATE OVERALL |
| STDC | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-C5541 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
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