| DISTANCE FROM LARGEST DIAMETER OF BEARING SURFACE OF HEAD TO RIBS | 0.440 INCHES NOMINAL |
| FASTENER LENGTH | 2.530 INCHES MINIMUM AND 2.590 INCHES MAXIMUM |
| HARDNESS RATING | 72.5 ROCKWELL SUPERFICIAL 15-N MINIMUM AND 80.5 ROCKWELL SUPERFICIAL 15-N MAXIMUM OVERALL |
| HEAD HEIGHT | 0.250 INCHES MINIMUM AND 0.280 INCHES MAXIMUM |
| HEAD DIAMETER | 0.970 INCHES MINIMUM AND 1.060 INCHES MAXIMUM |
| HEAD STYLE | FLAT CHAMFER |
| MATERIAL DOCUMENT AND CLASSIFICATION | SAE J429 (GR 5) ASSN STD ALL MATERIAL RESPONSES OVERALL |
| MATERIAL | STEEL OVERALL |
| NOMINAL THREAD DIAMETER | 0.562 INCHES |
| NONSTANDARD THREAD PITCH DIAMETER | +0.5224 TO 0.5254 INCHES |
| RIB LENGTH | 0.380 INCHES NOMINAL |
| RIB MAJOR DIAMETER | 0.648 INCHES MINIMUM AND 0.656 INCHES MAXIMUM |
| RIB QUANTITY | 30 |
| SHOULDER DIAMETER | 0.673 INCHES MINIMUM AND 0.683 INCHES MAXIMUM FIRST SHOULDER |
| SHOULDER DIAMETER | 0.805 INCHES NOMINAL SECOND SHOULDER |
| SHOULDER LENGTH | 0.250 INCHES NOMINAL FIRST SHOULDER |
| SHOULDER LENGTH | 0.380 INCHES NOMINAL SECOND SHOULDER |
| SHOULDER SHAPE | ROUND FIRST SHOULDER |
| SHOULDER SHAPE | RIBBED SECOND SHOULDER |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | PS NO 328 FSCM 09386 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | PHOSPHATE OVERALL |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 1.320 INCHES NOMINAL |
| THREAD QUANTITY PER INCH | 18 |
| THREAD SERIES DESIGNATOR | UNS |