The Strap,retaining, cataloged under National Stock Number 5340-01-216-1729, 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 1 manufacturer part number 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-01-216-1729 |
| Primary Part Number | S278DCH28 |
| Item Name | Strap,retaining |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Umpco, Inc. Dba Umpco Inc |
| Status | ACTIVE |
| Mounting Hole Size | 0.204 INCHES NOMINAL IN |
| Distance Between Mounting Hole Centers | 2.690 INCHES NOMINAL IN |
| Mounting Pad | NOT INCLUDED |
| Style Designator | SADDLE ARCH |
| Material Thickness | 0.050 INCHES NOMINAL IN |
| Cushion | INCLUDED |
| Distance Between Base and Inside of Arch | 1.841 INCHES NOMINAL IN |
| Surface Treatment | CHROMATE |
| Material | ALUMINUM ALLOY 2024 AND ALUMINUM ALLOY 1230 LOCATION NOT OTHERWISE SPECIFIED |
| Inside Diameter/arch Length | 1.735 INCHES MINIMUM AND 1.765 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 |
|---|---|
| S278DCH28 | Umpco, Inc. Dba Umpco Inc (USA) |
| Reference | Meaning |
|---|---|
| 9D0018DC28HB | 5/2 Secondary reference U.S. Government activity |
| TA09C89DC28HB | 3/2 Design control — primary reference U.S. Government activity |
| TA9C89D28HB | 5/9 Secondary reference U.S. Government activity |
| 10034-0128 | 3/2 Design control — primary reference U.S. Government activity |
| LE127-0009-0128 | 7/2 Vendor item drawing reference The Boeing Company Div Legacy Am&m |
| 1399D28HT | 5/9 Secondary reference U.S. Government activity |
NSN 5340-01-216-1729 is a Strap,retaining, manufactured by Umpco, Inc. Dba Umpco Inc, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-216-1729 has 1 manufacturer part number on file: S278DCH28 (Umpco, Inc. Dba Umpco Inc).
Key specifications for S278DCH28: Mounting Hole Size: 0.204 INCHES NOMINAL IN; Distance Between Mounting Hole Centers: 2.690 INCHES NOMINAL IN; Mounting Pad: NOT INCLUDED; Style Designator: SADDLE ARCH. 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.