| THREAD SERIES DESIGNATOR | UNF |
| NOMINAL THREAD DIAMETER | 0.500 INCHES |
| THREAD QUANTITY PER INCH | 20 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 2.100 INCHES NOMINAL |
| FASTENER LENGTH | 2.120 INCHES MINIMUM AND |
| 2.180 INCHES MAXIMUM |
| MATERIAL | PLASTIC NYLON LOCKING FEATURE |
| STEEL COMP 4130 OR |
| STEEL COMP 4135 OR |
| STEEL COMP 4137 OR |
| STEEL COMP 4140 OR |
| STEEL COMP 4142 OR |
| STEEL COMP 4145 OR |
| STEEL COMP 4340 OR |
| STEEL COMP 8630 OR |
| STEEL COMP 8635 OR |
| STEEL COMP 8637 OR |
| STEEL COMP 8640 OR |
| STEEL COMP 8642 OR |
| STEEL COMP 8645 FASTENER |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-DTL-18240 MIL STD SINGLE MATERIAL RESPONSE LOCKING FEATURE |
| ASTM A322 ASSN STD SINGLE MATERIAL RESPONSE FASTENER |
| SURFACE TREATMENT | ZINC FASTENER |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | ASTM B633,TY II,SC 2,0.3 MILS THICK ASSN STD SINGLE TREATMENT RESPONSE FASTENER |
| HARDNESS RATING | 33.0 ROCKWELL C MINIMUM AND |
| 38.0 ROCKWELL C MAXIMUM FASTENER |
| HEAD STYLE | HEADLESS (SETSCREW) |
| INTERNAL DRIVE STYLE | HEXAGON |
| WIDTH ACROSS FLATS | 0.250 INCHES NOMINAL |
| POINT STYLE | FLAT |
| POINT DIAMETER | 0.270 INCHES MINIMUM AND |
| 0.300 INCHES MAXIMUM |
| SPECIAL FEATURES | LOCKING ELEMENT IAW MIL-DTL-18240 |
| SUPPLEMENTARY FEATURES | REFER TO DRAWING FOR ADDITIONAL REQUIREMENTS |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | STUD,ARMOR MOUNTING |