The Gear,helical, cataloged under National Stock Number 3020-00-239-0653, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Westinghouse Electric Corp. Government technical data includes 23 specifications, cited from the U.S. Government catalog. The record lists 8 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 21 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-239-0653 |
| Primary Part Number | D2-8772PC103 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Westinghouse Electric Corp |
| Status | ACTIVE |
| Keyway Nominal Width | 0.621 INCHES BOTH ENDS IN |
| Bore Nominal Diameter | 5.186 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 7.000 INCHES SECOND END IN |
| Hub Nominal Diameter | 6.750 INCHES FIRST END IN |
| Teeth Quantity | 45 |
| Body Style | PLAIN, SOLID |
| Tooth Direction | RIGHT |
| Bore Style | W/ KEYWAY BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 1.000 INCHES FIRST END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 0.250 INCHES SECOND END IN |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 10.0 ROCKWELL C MINIMUM AND 20.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Overall Length | 3.750 INCHES IN |
| Style Designator | PROTRUDING HUBS |
| Material Document and Classification | MIL-S-890,CLASS AN MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 8.4938 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN BOTH ENDS |
| Nominal Outside Diameter | 8.7438 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 2.922 INCHES BOTH ENDS IN |
| Pressure Angle | 14.5000 DEGREES |
| Material | STEEL OVERALL |
| Face Nominal Width | 2.500 INCHES IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| D2-8772PC103 PRIMARY | Westinghouse Electric Corp (USA) |
| D2-8689PC126 PRIMARY | Westinghouse Electric Corp (USA) |
| D2-8677PC126 PRIMARY | Westinghouse Electric Corp (USA) |
| N12018 PRIMARY | Westinghouse Electric Corp (USA) |
| D2-8775PC126 PRIMARY | Westinghouse Electric Corp (USA) |
| D2-8872PC103 PRIMARY | Westinghouse Electric Corp (USA) |
| D2-8853PC126 PRIMARY | Westinghouse Electric Corp (USA) |
| D2-8551PC103 PRIMARY | Westinghouse Electric Corp (USA) |
| Reference | Meaning |
|---|---|
| D2-8772PC103 | 3/2 Design control — primary reference U.S. Government activity |
| D2-8853PC126 | 5/9 Secondary reference U.S. Government activity |
| D2-8551PC103 | 5/9 Secondary reference Usm Corp Sub of Emhart Industries Inc Farrel Co Div |
| N12018 | 3/2 Design control — primary reference U.S. Government activity |
| D2-8677PC126 | 5/9 Secondary reference Usm Corp Sub of Emhart Industries Inc Farrel Co Div |
| D2-8775PC126 | 5/9 Secondary reference U.S. Government activity |
| D2-8772PC103 | 5/9 Secondary reference Usm Corp Sub of Emhart Industries Inc Farrel Co Div |
| D2-8853PC126 | 3/2 Design control — primary reference U.S. Government activity |
| D2-8775PC126 | 5/9 Secondary reference Usm Corp Sub of Emhart Industries Inc Farrel Co Div |
| D2-8551PC103 | 3/2 Design control — primary reference U.S. Government activity |
| D2-8677PC126 | 5/9 Secondary reference U.S. Government activity |
| D2-8689-126 | C/1 Advisory reference — outside the item-of-supply concept Usm Corp Sub of Emhart Industries Inc Farrel Co Div |
| D2-8551PC103 | 5/9 Secondary reference U.S. Government activity |
| D2-8677PC126 | 3/2 Design control — primary reference U.S. Government activity |
| D2-8689PC126 | 5/9 Secondary reference U.S. Government activity |
| D2-8689PC126 | 3/2 Design control — primary reference U.S. Government activity |
| D2-8775PC126 | 3/2 Design control — primary reference U.S. Government activity |
| D2-8853PC126 | 5/9 Secondary reference Usm Corp Sub of Emhart Industries Inc Farrel Co Div |
| D2-8689PC126 | 5/9 Secondary reference Usm Corp Sub of Emhart Industries Inc Farrel Co Div |
| D2-8772PC103 | 5/9 Secondary reference U.S. Government activity |
NSN 3020-00-239-0653 is a Gear,helical, manufactured by Westinghouse Electric Corp, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-239-0653 has 8 manufacturer part numbers on file: D2-8772PC103 (Westinghouse Electric Corp), D2-8689PC126 (Westinghouse Electric Corp), D2-8677PC126 (Westinghouse Electric Corp), N12018 (Westinghouse Electric Corp), D2-8775PC126 (Westinghouse Electric Corp) and 3 more.
Key specifications for D2-8772PC103: Keyway Nominal Width: 0.621 INCHES BOTH ENDS IN; Bore Nominal Diameter: 5.186 INCHES BOTH ENDS IN; Hub Nominal Diameter: 7.000 INCHES SECOND END IN; Hub Nominal Diameter: 6.750 INCHES FIRST END IN. 23 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.