The Grommet,metallic, cataloged under National Stock Number 5325-01-499-5056, is classified within Federal Supply Class 5325 (Fastening Devices) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5325-01-499-5056 |
| Primary Part Number | HS4874-6B4A |
| Item Name | Grommet,metallic |
| FSC / FSG | 5325 / 53 — Fastening Devices |
| Manufacturer | The Boeing Company |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Flange Outside Diameter | 0.875 INCHES NOMINAL IN |
| Material Document and Classification | QQ-A-225/6 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-A-250/4 FED SPEC SINGLE MATERIAL RESPONSE WASHER |
| Material Document and Classification | QQ-A-225/8 FED SPEC SINGLE MATERIAL RESPONSE GROMMET |
| Washer Style | FLAT W/ FORMED INNER EDGE |
| Barrel Overall Height | 0.247 INCHES MINIMUM AND 0.252 INCHES MAXIMUM IN |
| Surface Treatment | ANODIZE OVERALL |
| Barrel Outside Diameter | 0.405 INCHES MAXIMUM IN |
| Material | ALUMINUM ALLOY 2024 WASHER |
| Material | ALUMINUM ALLOY 6061 GROMMET |
| Flange Style | FLANGE |
| Barrel Style | BELL FLANGE STRAIGHT TYPE |
| 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 |
|---|---|
| HS4874-6B4A | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| HS4874-6B4A PRIMARY | The Boeing Company (USA) |
| Reference | Meaning |
|---|---|
| HS4874-6B4A | 5/9 Secondary reference Mcdonnell Douglas Helicopter Co Inc |
| HS4874-6B4A | 5/9 Secondary reference U.S. Government activity |
| HS4874-6B4A | 5/2 Secondary reference U.S. Government activity |
NSN 5325-01-499-5056 is a Grommet,metallic, manufactured by The Boeing Company, classified under FSC 5325, Fastening Devices. Status: active.
NSN 5325-01-499-5056 has 2 manufacturer part numbers on file: HS4874-6B4A (Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok), HS4874-6B4A (The Boeing Company).
Key specifications for HS4874-6B4A: Surface Treatment Document and Classification: MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Flange Outside Diameter: 0.875 INCHES NOMINAL IN; Material Document and Classification: QQ-A-225/6 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-A-250/4 FED SPEC SINGLE MATERIAL RESPONSE WASHER; Material Document and Classification: QQ-A-225/8 FED SPEC SINGLE MATERIAL RESPONSE GROMMET. 12 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.