| ASA STANDARD CHAIN NUMBER | 25 |
| BORE TYPE | INVOLUTE SPLINE |
| COUNTERBORE DEPTH | 0.400 INCHES MINIMUM AND 0.170 INCHES MAXIMUM |
| COUNTERBORE DIAMETER | 0.725 INCHES MINIMUM AND 1.250 INCHES MAXIMUM |
| COUNTERBORE LOCATION | BOTH ENDS |
| DESIGN FORM | PLAIN |
| FURNISHED ITEMS | COUNTERBORE |
| FACE WIDTH | 0.110 INCHES NOMINAL |
| FIRST STEP DIAMETER | 1.560 INCHES NOMINAL AA END |
| FIRST STEP LENGTH | 0.740 INCHES NOMINAL AA END |
| HARDNESS RATING TEST METHOD | ROCKWELL |
| HUB OUTSIDE DIAMETER | 0.885 INCHES NOMINAL AA END |
| OUTSIDE DIAMETER | 3.008 INCHES NOMINAL |
| OVERALL LENGTH | 1.020 INCHES NOMINAL |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-5000, COMP 4340, COND C1 MIL SPEC SINGLE MATERIAL RESPONSE |
| MATERIAL | STEEL COMP E4340 |
| METALLIC HARDNESS RATING AND LOCATION | 34.0 ROCKWELL C MINIMUM HUB AND 36.0 ROCKWELL C MAXIMUM HUB |
| PITCH DIAMETER | 2.869 INCHES NOMINAL |
| PROTRUDING HUB CHARACTERISTIC | STEPPED |
| SECOND STEP LENGTH | 0.170 INCHES NOMINAL AA END |
| SPLINE MINOR DIAMETER | 0.550 INCHES MINIMUM AND 0.555 INCHES MAXIMUM |
| SPLINE PITCH DIAMETER | 0.6000 INCHES NOMINAL |
| SPLINE PRESSURE ANGLE IN DEG | 30.0 |
| SPLINE QUANTITY | 12 |
| SPLINE LENGTH | 0.450 INCHES NOMINAL |
| SPLINE MAJOR DIAMETER | 0.690 INCHES MINIMUM AND 0.700 INCHES MAXIMUM |
| STYLE DESIGNATOR | PLAIN |
| SURFACE TREATMENT | PHOSPHATE |
| TEETH HARDNESS RATING | 34.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM |
| TEETH QUANTITY PER ROW | 36 |
| TEETH ROW QUANTITY | 1 |
| TOOTH PITCH | 0.250 INCHES NOMINAL |