| THREAD SERIES DESIGNATOR | UNF |
| NOMINAL THREAD DIAMETER | 0.500 INCHES |
| THREAD QUANTITY PER INCH | 20 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.930 INCHES MINIMUM |
| FASTENER LENGTH | 1.740 INCHES MINIMUM AND |
| 1.750 INCHES MAXIMUM |
| MATERIAL | STEEL COMP 1335 OR |
| STEEL COMP 1340 OR |
| STEEL COMP 4037 OR |
| STEEL COMP 4135 OR |
| STEEL COMP 8637 OR |
| STEEL COMP 8640 OR |
| STEEL COMP 8735 OR |
| STEEL COMP 8740 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-W-405 FED SPEC 1ST MATERIAL RESPONSE OR |
| ASTM A322 ASSN STD 1ST MATERIAL RESPONSE OR |
| QQ-W-405 FED SPEC 2ND MATERIAL RESPONSE OR |
| ASTM A322 ASSN STD 2ND MATERIAL RESPONSE OR |
| QQ-W-405 FED SPEC 3RD MATERIAL RESPONSE OR |
| ASTM A322 ASSN STD 3RD MATERIAL RESPONSE OR |
| QQ-W-405 FED SPEC 4TH MATERIAL RESPONSE OR |
| QQ-W-405 FED SPEC 5TH MATERIAL RESPONSE OR |
| ASTM A322 ASSN STD 5TH MATERIAL RESPONSE OR |
| QQ-W-405 FED SPEC 6TH MATERIAL RESPONSE OR |
| QQ-W-405 FED SPEC 7TH MATERIAL RESPONSE OR |
| QQ-W-405 FED SPEC 8TH MATERIAL RESPONSE OR |
| ASTM A322 ASSN STD 8TH MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM AND |
| CHROMATE OR |
| ZINC AND |
| CHROMATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY 2,CL 2 FED SPEC 1ST TREATMENT RESPONSE AND |
| QQ-P-416,TY 2,CL 2 FED SPEC 2ND TREATMENT RESPONSE OR |
| QQ-Z-325,TY 2,CL 2 FED SPEC 3RD TREATMENT RESPONSE AND |
| QQ-Z-325,TY 2,CL 2 FED SPEC 4TH TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 78.0 ROCKWELL SUPERFICIAL 15-N MINIMUM AND |
| 84.0 ROCKWELL SUPERFICIAL 15-N MAXIMUM OVERALL |
| HEAD STYLE | FLAT CHAMFER |
| HEAD DIAMETER | 0.800 INCHES NOMINAL |
| HEAD HEIGHT | 0.250 INCHES NOMINAL |
| SHOULDER SHAPE | RIBBED FIRST SHOULDER |
| SHOULDER DIAMETER | 0.535 INCHES MINIMUM AND |
| 0.540 INCHES MAXIMUM FIRST SHOULDER |
| SHOULDER LENGTH | 0.690 INCHES MINIMUM AND |
| 0.700 INCHES MAXIMUM FIRST SHOULDER |
| RIB QUANTITY | 35 |
| RIB MAJOR DIAMETER | 0.550 INCHES MINIMUM AND |
| 0.560 INCHES MAXIMUM |
| RIB LENGTH | 0.120 INCHES NOMINAL |
| DISTANCE FROM LARGEST DIAMETER OF BEARING SURFACE OF HEAD TO RIBS | 0.090 INCHES NOMINAL |
| RIB MINOR DIAMETER | 0.535 INCHES MINIMUM AND |
| 0.540 INCHES MAXIMUM |
| SPEC/STD CONTROLLING DATA | |
| MANUFACTURERS CODE | 96906 |
| DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | MS51948-4 |