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| Item Name | Gear Helical |
| Federal Supply Group (FSG) | Mechanical Power Transmission Equipment |
| Federal Supply Class (FSC) | 3020 Gear Pulley Sprocket and Transmission Chain |
| National Item Identification Number (NIIN) | 00-251-0879 (002510879) |
| NCB Code | USA (00) |
| Manufacturer | Norfolk Naval Shipyard |
| MRC | Criteria | Characteristic |
|---|---|---|
| AAQL | BODY STYLE | PLAIN,SOLID |
| AGJS | PITCH DIAMETER | 3.3622 INCHES NOMINAL |
| AJLA | TEETH QUANTITY | 30 |
| ANTP | BORE STYLE | W/ KEYWAY BOTH ENDS |
| CQFM | HARDNESS RATING | 21.0 ROCKWELL C MINIMUM OVERALL AND 25.0 ROCKWELL C MAXIMUM OVERALL |
| CWCD | NOMINAL OUTSIDE DIAMETER | 3.5622 INCHES |
| CWFR | NOMINAL OVERALL LENGTH | 1.359 INCHES |
| CWMW | TEETH TYPE | SINGLE HELIX |
| CWNH | TOOTH FORM | STANDARD |
| CWNM | TOOTH DIRECTION | RIGHT |
| CWPP | PRESSURE ANGLE | 14.5000 DEGREES |
| CWPZ | HELIX ANGLE | 26.8333 DEGREES |
| CWQL | NOMINAL DISTANCE BETWEEN BODY FACE AND PROTRUDING HUB END | 0.140 INCHES FIRST END |
| CWRM | FACE NOMINAL WIDTH | 1.219 INCHES |
| CWRS | BORE NOMINAL DIAMETER | 1.999 INCHES BOTH ENDS |
| CWSN | KEYWAY NOMINAL WIDTH | 0.312 INCHES BOTH ENDS |
| CWSR | NOMINAL DISTANCE FROM BORE CENTER TO KEYWAY BOTTOM | 1.166 INCHES BOTH ENDS |
| CWTR | HUB STYLE DESIGNATOR | PLAIN FIRST END |
| CWTX | HUB NOMINAL DIAMETER | 2.875 INCHES FIRST END |
| FEAT | SPECIAL FEATURES | TIMING MARK AT CENTER LINE OF TOOTH SPACED 42 DEG 14 MIN FROM CENTER LINE OF KEYWAY,2 PULLER HOLES 3/8-16 UNC 2B THD,9/16 IN. DEEP ON 2-9/16 IN. DIA BOLT CIRCLE |
| MATT | MATERIAL | STEEL COMP 1137 OVERALL |
| MDCL | MATERIAL DOCUMENT AND CLASSIFICATION | 66 FED STD SINGLE MATERIAL RESPONSE OVERALL AND AISI/SAE 1137 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| STYL | STYLE DESIGNATOR | PROTRUDING HUB |
| Relevant Components for NSN - 3020-00-251-0879, 3020002510879 | ||||
| 3010-01-653-1678 (3010016531678) | 3010-01-218-4876 (3010012184876) | 3010-01-438-0929 (3010014380929) | 3040-00-474-2093 (3040004742093) | |
| 3040-01-393-8375 (3040013938375) | 3040-01-710-9074 (3040017109074) | 3040-00-875-4642 (3040008754642) | 3040-01-240-5938 (3040012405938) | |
| 3020-01-058-7574 (3020010587574) | 3040-00-294-5630 (3040002945630) | 3020-01-190-1102 (3020011901102) | 3020-01-262-9386 (3020012629386) | |
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