| THREAD SERIES DESIGNATOR | UNC |
| NOMINAL THREAD DIAMETER | 0.312 INCHES |
| THREAD QUANTITY PER INCH | 18 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 1.000 INCHES NOMINAL |
| FASTENER LENGTH | 1.000 INCHES NOMINAL |
| MATERIAL | STEEL COMP 2340 OR |
| STEEL COMP 3135 OR |
| STEEL COMP 4037 OR |
| STEEL COMP 4137 OR |
| STEEL COMP 4140 OR |
| STEEL COMP 4340 OR |
| STEEL COMP 8630 OR |
| STEEL COMP 8740 OR |
| STEEL OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-S-624 FED SPEC 1ST MATERIAL RESPONSE OR |
| QQ-S-624 FED SPEC 2ND MATERIAL RESPONSE OR |
| QQ-S-624 FED SPEC 3RD MATERIAL RESPONSE OR |
| QQ-S-624 FED SPEC 4TH MATERIAL RESPONSE OR |
| QQ-S-624 FED SPEC 5TH MATERIAL RESPONSE OR |
| QQ-S-624 FED SPEC 6TH MATERIAL RESPONSE OR |
| QQ-S-624 FED SPEC 7TH MATERIAL RESPONSE OR |
| QQ-S-624 FED SPEC 8TH MATERIAL RESPONSE OR |
| QQ-S-624,FS9440 FED SPEC 9TH MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | PHOSPHATE OVERALL |
| HARDNESS RATING | 36.0 ROCKWELL C MINIMUM AND |
| 43.0 ROCKWELL C MAXIMUM OVERALL |
| MINIMUM YIELD STRENGTH | 140000 POUNDS PER SQUARE INCH |
| HEAD STYLE | FLAT CHAMFER |
| HEAD DIAMETER | 0.429 INCHES MINIMUM AND |
| 0.437 INCHES MAXIMUM |
| HEAD HEIGHT | 0.306 INCHES MINIMUM AND |
| 0.312 INCHES MAXIMUM |
| INTERNAL DRIVE STYLE | HEXAGON |
| WIDTH ACROSS FLATS | 0.218 INCHES MINIMUM AND |
| 0.220 INCHES MAXIMUM |
| NONDEFINITIVE SPEC/STD DATA | 1 TYPE AND |
| 11 STYLE |
| SPEC/STD CONTROLLING DATA | |
| MANUFACTURERS CODE | 81348 |
| NON-DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | FFS86TYPE1STYLE11 |