The Clamp,loop, cataloged under National Stock Number 5340-01-054-3842, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Umpco, Inc. Dba Umpco Inc. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-01-054-3842 |
| Primary Part Number | S280D21 |
| Item Name | Clamp,loop |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Umpco, Inc. Dba Umpco Inc |
| Status | ACTIVE |
| Style Designator | SINGLE LOOP |
| Diameter | 0.204 INCHES NOMINAL IN |
| Material Thickness | 0.047 INCHES MINIMUM AND 0.053 INCHES MAXIMUM IN |
| Distance From Loop Center to Tongue End | 1.282 INCHES MINIMUM AND 1.312 INCHES MAXIMUM IN |
| Surface Treatment | ANODIZE BAND |
| Tongue Hole Type | ROUND, UNTHREADED |
| Center to Center Distance Between Loop and Mounting Hole | 1.064 INCHES MINIMUM AND 1.094 INCHES MAXIMUM IN |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE CUSHION |
| Material | ALUMINUM ALLOY 2024 BAND |
| Loop Inside Diameter | 1.298 INCHES MINIMUM AND 1.328 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Unit of Issue | EA |
| Part Number | Manufacturer |
|---|---|
| S280D21 | Umpco, Inc. Dba Umpco Inc (USA) |
| 44LC9D21T | J & M Products, Inc (USA) |
| JM44LC9D21T | J & M Products, Inc (USA) |
| Reference | Meaning |
|---|---|
| TA11C44D21T | 5/2 Secondary reference U.S. Government activity |
| 5340PL0846590 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| C2874D21 | 3/2 Design control — primary reference U.S. Government activity |
| 5340PL1730596 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 477-21 | 5/2 Secondary reference U.S. Government activity |
| 5340PL1730604 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 5340-01-054-3842 is a Clamp,loop, manufactured by Umpco, Inc. Dba Umpco Inc, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-054-3842 has 3 manufacturer part numbers on file: S280D21 (Umpco, Inc. Dba Umpco Inc), 44LC9D21T (J & M Products, Inc), JM44LC9D21T (J & M Products, Inc).
2 possible matches (shared part number, not a government interchangeability claim): 5945-01-421-5377, 5985-01-459-3425. Verify interchangeability with system specifications before substitution.
Key specifications for S280D21: Style Designator: SINGLE LOOP; Diameter: 0.204 INCHES NOMINAL IN; Overall Width: 0.500 INCHES NOMINAL IN; Material Thickness: 0.047 INCHES MINIMUM AND 0.053 INCHES MAXIMUM IN. 10 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). 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.