The Gear,internal, cataloged under National Stock Number 3020-01-047-3124, 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 Ingersoll-Rand Company Dba Ingersoll-Rand. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-047-3124 |
| Primary Part Number | B33374 |
| Item Name | Gear,internal |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Ingersoll-Rand Company Dba Ingersoll-Rand |
| Status | ACTIVE |
| Hub Nominal Diameter | 1.250 INCHES SECOND END IN |
| Teeth Quantity | 60 |
| Body Style | WEBBED, OFFSET, SOLID |
| Bore Style | STRAIGHT SPLINE BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.250 INCHES BOTH ENDS IN |
| Hardness Rating | 35.0 ROCKWELL C MINIMUM AND 39.0 ROCKWELL C MAXIMUM TEETH |
| Nominal Overall Length | 1.185 INCHES IN |
| Style Designator | SOLID BACK RING, PROTRUDING HUB, RECESSED HUB |
| Material Document and Classification | ASTM A536-65T,GEADE 80-55-06 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Tooth Form | STANDARD |
| First Step Nominal Diameter | 1.250 INCHES FIRST END IN |
| Hub Style Designator | 1 STEP FIRST END |
| Hub Style Designator | PLAIN SECOND END |
| Spline Quantity | 6 BOTH ENDS |
| Nominal Outside Diameter | 3.750 INCHES IN |
| End Nominal Diameter | 1.057 INCHES FIRST END IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | IRON CAST OVERALL |
| Face Nominal Width | 0.718 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 |
|---|---|
| 31409-303 | Ingersoll-Rand Company Dba Ingersoll-Rand (USA) |
| B33374 PRIMARY | Ingersoll-Rand Company Dba Ingersoll-Rand (USA) |
| Reference | Meaning |
|---|---|
| AL10C28HC ITEM 76 | 5/9 Secondary reference Duff-Norton Co Inc |
| 596883 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 33374 | 5/9 Secondary reference Ingersoll-Rand Company Dba Ingersoll-Rand |
| 33374 | C/1 Advisory reference — outside the item-of-supply concept Ingersoll-Rand Company Dba Ingersoll-Rand Div Tool & Hoist Division |
| 596883 | 5/9 Secondary reference Duff-Norton Co Inc |
NSN 3020-01-047-3124 is a Gear,internal, manufactured by Ingersoll-Rand Company Dba Ingersoll-Rand, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-047-3124 has 2 manufacturer part numbers on file: 31409-303 (Ingersoll-Rand Company Dba Ingersoll-Rand), B33374 (Ingersoll-Rand Company Dba Ingersoll-Rand).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-214-7284, 4820-01-420-7966. Verify interchangeability with system specifications before substitution.
Key specifications for B33374: Hub Nominal Diameter: 1.250 INCHES SECOND END IN; Teeth Quantity: 60; Body Style: WEBBED, OFFSET, SOLID; Bore Style: STRAIGHT SPLINE BOTH ENDS. 19 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.