The Cover,access, cataloged under National Stock Number 5340-00-591-4977, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Lockheed Martin Corporation Div Rms - Mitchel Field. Government technical data includes 17 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 | 5340-00-591-4977 |
| Primary Part Number | 818166 |
| Item Name | Cover,access |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Lockheed Martin Corporation Div Rms - Mitchel Field |
| Status | ACTIVE |
| FSC Application Data | CONTROL RATE GYRO |
| Flange Thickness | 0.032 INCHES NOMINAL IN |
| Inside Corner Radius | 0.188 INCHES NOMINAL IN |
| First Recess Inside Height | 0.833 INCHES MINIMUM AND 0.843 INCHES MAXIMUM IN |
| Hole Quantity Along Length | 2 |
| Distance Between Hole Centers | 0.687 INCHES NOMINAL IN |
| Mounting Opening Shape Style | UNTHREADED HOLE |
| Material Document and Classification | QQ-A-250/8,H34 FED SPEC SINGLE MATERIAL RESPONSE |
| Cross-Sectional Shape Style | CIRCULAR RECESS |
| Outside Diameter | 2.136 INCHES MINIMUM AND 2.146 INCHES MAXIMUM IN |
| Bolt Hole Centerline to Nearest Edge Distance | 0.725 INCHES MINIMUM AND 0.730 INCHES MAXIMUM IN |
| Securing Device Type | THREADED FASTENER |
| Inside Diameter | 2.072 INCHES MINIMUM AND 2.082 INCHES MAXIMUM IN |
| Peripheral Shape Style | ROUND, MULTI HOLES |
| Material | ALUMINUM ALLOY 5052 |
| Hole Diameter | 0.140 INCHES NOMINAL IN |
| Body Thickness | 0.032 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 818166 PRIMARY | Lockheed Martin Corporation Div Rms - Mitchel Field (USA) |
NSN 5340-00-591-4977 is a Cover,access, manufactured by Lockheed Martin Corporation Div Rms - Mitchel Field, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-00-591-4977 has 1 manufacturer part number on file: 818166 (Lockheed Martin Corporation Div Rms - Mitchel Field).
1 possible match (shared part number, not a government interchangeability claim): 5930-00-887-5968. Verify interchangeability with system specifications before substitution.
Key specifications for 818166: FSC Application Data: CONTROL RATE GYRO; Flange Thickness: 0.032 INCHES NOMINAL IN; Inside Corner Radius: 0.188 INCHES NOMINAL IN; First Recess Inside Height: 0.833 INCHES MINIMUM AND 0.843 INCHES MAXIMUM IN. 17 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.