The Pulley,groove, cataloged under National Stock Number 3020-01-311-5673, 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 Emerson Electric Co Browning Mfg Div. Government technical data includes 28 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-311-5673 |
| Primary Part Number | 4TB40 |
| Item Name | Pulley,groove |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Emerson Electric Co Browning Mfg Div |
| Status | ACTIVE |
| Integral Cooling Vane | NOT INCLUDED |
| Bore Feature | INCLUDED |
| Taper Bore Minor Diameter | 1.855 INCHES NOMINAL IN |
| Securing Method | THREADED HOLE(S) |
| Split Hub Feature | NOT INCLUDED |
| Bore Length | 3.250 INCHES NOMINAL IN |
| Design Form | PLAIN |
| Groove Shape | V |
| Outside Diameter | 4.350 INCHES NOMINAL IN |
| Style Designator | PLAIN |
| Groove Depth | 0.490 INCHES NOMINAL IN |
| Bore Type | STRAIGHT OR TAPERED |
| Bearings | NOT INCLUDED |
| Groove Quantity | 4 |
| Taper Bore Major Diameter | 1.938 INCHES NOMINAL IN |
| Thread Direction | RIGHT-HAND |
| V Groove Angle in Deg | 34.0 |
| Nominal Thread Size | 0.312 INCHES IN |
| Securing Hole Quantity | 3 |
| Thread Size | 5/16-18 |
| Hole Location | 3 HOLES EQUALLY SPACED ON 2.438 DIA |
| Counterbore Feature | NOT INCLUDED |
| Bore Diameter | 2.530 INCHES NOMINAL IN |
| Material | IRON CAST OVERALL |
| Face Width | 3.250 INCHES NOMINAL IN |
| Groove Width | 0.494 INCHES NOMINAL IN |
| Securing Location | PULLEY SURFACE |
| Lightening Hole | NOT INCLUDED |
| 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 |
|---|---|
| 4TB40 PRIMARY | Emerson Electric Co Browning Mfg Div (USA) |
| Reference | Meaning |
|---|---|
| 1551AS314-1 | 7/2 Vendor item drawing reference Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
NSN 3020-01-311-5673 is a Pulley,groove, manufactured by Emerson Electric Co Browning Mfg Div, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-311-5673 has 1 manufacturer part number on file: 4TB40 (Emerson Electric Co Browning Mfg Div).
Key specifications for 4TB40: Integral Cooling Vane: NOT INCLUDED; Bore Feature: INCLUDED; Taper Bore Minor Diameter: 1.855 INCHES NOMINAL IN; Securing Method: THREADED HOLE(S). 28 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.