3/8" x 0.812" OD Thru-Hardened Plain Finish Steel SAE General Purpose Flat Washer / CROSS-SECTIONAL SHAPE STYLE: 1 RECTANGULAR HOLE DIAMETER: 0.406 INCHES NOMINAL PERIPHERAL SHAPE STYLE: 1 ROUND CENTER HOLE SHAPE STYLE: 1 ROUND THICKNESS: 0.134 INCHES NOMINAL OVERALL DIAMETER: 1.125 INCHES NOMINAL END ITEM IDENTIFICATION: MRAP - UNIQUE NSN - USED ON 2 MRAP VARIANTS PART NAME ASSIGNED BY CONTROLLING AGENCY: WASHER,FLAT, 3/8 INCH SPECIAL FEATURES: NOMINAL SIZE IS 0.375 INCHES MATERIAL: STEEL OVERALL MATERIAL DOCUMENT AND CLASSIFICATION: 1040 TO 1065 PER CEMS A-0, PART 1, QUENCHED AND TEMPERED TO RC 36 TO 42 MFR REF SINGLE MATERIAL RESPONSE OVERALL PROPRIETARY CHARACTERISTICS: NPAC SURFACE TREATMENT: PHOSPHATE OVERALL SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: PHOSPHATE COATING (PHC) CEMS G-1, CLASS B2 MFR REF SINGLE TREATMENT RESPONSE OVERALL