| EXTENDED WASHER THICKNESS | 0.037 INCHES MINIMUM AND 0.063 INCHES MAXIMUM |
| EXTENDED WASHER DIAMETER | 0.720 INCHES MINIMUM AND 0.780 INCHES MAXIMUM |
| FASTENER LENGTH | 0.950 INCHES MINIMUM AND 1.000 INCHES MAXIMUM |
| FEATURES PROVIDED | CASEHARDENED |
| HARDNESS RATING | 32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD HEIGHT | 0.307 INCHES MINIMUM AND 0.358 INCHES MAXIMUM |
| HEAD STYLE | HEXAGON EXTENDED WASHER |
| INTERNAL DRIVE STYLE | W/O INTERNAL DRIVE |
| MATERIAL DOCUMENT AND CLASSIFICATION | 66 FED STD SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP 4037 OVERALL |
| MINIMUM TENSILE STRENGTH | 150000 POUNDS PER SQUARE INCH |
| NONDEFINITIVE SPEC/STD DATA | B TYPE |
| NONMACHINE NOMINAL THREAD DIAMETER | 0.375 INCHES |
| NONMACHINE THREAD STYLE | BLUNT (TYPE TT) |
| WIDTH BETWEEN FLATS | 0.551 INCHES MINIMUM AND 0.562 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416 TY 2 CL2 FED SPEC SINGLE TREATMENT RESPONSE OR MIL-C-81562 TY 2 CL 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM AND CHROMATE OVERALL |