The Fan,centrifugal, cataloged under National Stock Number 4140-01-253-5756, is classified within Federal Supply Class 4140 (Fans, Air Circulators, and Blower Equipment) of the Refrigeration, AC, and Air Circulating Equipment group. The manufacturer of record is Brailsford & Co, Inc. Government technical data includes 20 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 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4140-01-253-5756 |
| Primary Part Number | TBL-2.5 |
| Item Name | Fan,centrifugal |
| FSC / FSG | 4140 / 41 — Fans, Air Circulators, and Blower Equipment |
| Manufacturer | Brailsford & Co, Inc |
| Status | ACTIVE |
| Outlet Location | TOP |
| Mounting Facility Type and Quantity | 4 UNTHREADED HOLE(S) |
| Speed Adjustments | SINGLE SPEED |
| Shaft Bearing Type | BALL |
| Inclosure Type | FULLY INCLOSED |
| Length | 3.875 INCHES NOMINAL IN |
| Voltage in Volts and Current Type | 20.0 DC |
| Drive Type | BELT |
| Prime Mover Power Rating | 10.000 WATTS |
| Outlet Inside Diameter | 1.594 INCHES NOMINAL IN |
| Style Designator | FIXED |
| Features Provided | RADIO INTERFERENCE SHIELDING |
| Discharge Direction | HORIZONTAL |
| Height | 4.375 INCHES NOMINAL IN |
| Environmental Protection | SHOCK PROOF |
| Width | 1.438 INCHES NOMINAL IN |
| Prime Mover Type | ELECTRIC MOTOR |
| Prime Mover Drive Shaft Bearing Type | BALL |
| Electrical Connection Type | WIRE LEAD |
| Air Flow Rate | 50.0 CUBIC FEET PER MINUTE NOMINAL |
| 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 |
|---|---|
| TBL-2.5 PRIMARY | Brailsford & Co, Inc (USA) |
NSN 4140-01-253-5756 is a Fan,centrifugal, manufactured by Brailsford & Co, Inc, classified under FSC 4140, Fans, Air Circulators, and Blower Equipment. Status: active.
NSN 4140-01-253-5756 has 1 manufacturer part number on file: TBL-2.5 (Brailsford & Co, Inc).
1 possible match (shared part number, not a government interchangeability claim): 1660-01-718-4398. Verify interchangeability with system specifications before substitution.
Key specifications for TBL-2.5: Outlet Location: TOP; Mounting Facility Type and Quantity: 4 UNTHREADED HOLE(S); Speed Adjustments: SINGLE SPEED; Shaft Bearing Type: BALL. 20 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.