The Strap,retaining, cataloged under National Stock Number 5340-01-303-5784, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 11 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5340-01-303-5784 |
| Primary Part Number | ST9M558C28 |
| Item Name | Strap,retaining |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Mounting Hole Size | 0.197 INCHES NOMINAL IN |
| Distance Between Mounting Hole Centers | 2.675 INCHES MINIMUM AND 2.705 INCHES MAXIMUM IN |
| Mounting Pad | INCLUDED |
| Style Designator | SADDLE ARCH |
| Material Document and Classification | AMS 3209 ASSN STD SINGLE MATERIAL RESPONSE CUSHIONING |
| Material Thickness | 0.051 INCHES NOMINAL IN |
| Cushion | INCLUDED |
| Surface Treatment | PASSIVATE |
| Material | RUBBER CHLOROPRENE CLASS CR CUSHIONING |
| Material | STEEL COMP 302 OR STEEL COMP 321 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 |
|---|---|
| ST9M558C28 PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| 1399SS28 | 5/2 Secondary reference U.S. Government activity |
| TA09C89SS28 | 5/2 Secondary reference U.S. Government activity |
NSN 5340-01-303-5784 is a Strap,retaining, manufactured by The Boeing Company Div Defense, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-303-5784 has 1 manufacturer part number on file: ST9M558C28 (The Boeing Company Div Defense).
Key specifications for ST9M558C28: Mounting Hole Size: 0.197 INCHES NOMINAL IN; Distance Between Mounting Hole Centers: 2.675 INCHES MINIMUM AND 2.705 INCHES MAXIMUM IN; Mounting Pad: INCLUDED; Style Designator: SADDLE ARCH. 11 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.