The Lock,valve Spring Retainer, cataloged under National Stock Number 2805-00-247-3263, is classified within Federal Supply Class 2805 (Gasoline Reciprocating Engines, Except Aircraft; and Components) of the Engines, Turbines, and Components group. The manufacturer of record is Lister Petter Ltd. Government technical data includes 11 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. 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 | 2805-00-247-3263 |
| Primary Part Number | 201-50920 |
| Item Name | Lock,valve Spring Retainer |
| FSC / FSG | 2805 / 28 — Gasoline Reciprocating Engines, Except Aircraft; and Components |
| Manufacturer | Lister Petter Ltd |
| Status | ACTIVE |
| First Ridge Radius | 0.047 INCHES NOMINAL IN |
| Minimum Inside Diameter | 0.312 INCHES IN |
| Thread Provision | UNTHREADED |
| Distance From Bottom to First Ridge Center | 0.047 INCHES NOMINAL IN |
| Largest Outside Diameter | 0.500 INCHES NOMINAL IN |
| First Ridge Width | 0.094 INCHES NOMINAL IN |
| Largest Inside Diameter | 0.172 INCHES NOMINAL IN |
| Style Designator | STRAIGHT BORE W/ONE RIDGE |
| Outside Included Angle in Deg | 80.0 |
| Casehardening Indicator | NOT CASEHARDENED |
| Material | STEEL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 2805-00-247-3263 is a Lock,valve Spring Retainer, manufactured by Lister Petter Ltd, classified under FSC 2805, Gasoline Reciprocating Engines, Except Aircraft; and Components. Status: active.
NSN 2805-00-247-3263 has 2 manufacturer part numbers on file: 201-50920 (Lister Petter Ltd), 201-50921 (Lister Petter Ltd).
1 possible match (shared part number, not a government interchangeability claim): 2815-01-085-1695. Verify interchangeability with system specifications before substitution.
Key specifications for 201-50920: Overall Height: 0.406 INCHES NOMINAL IN; First Ridge Radius: 0.047 INCHES NOMINAL IN; Minimum Inside Diameter: 0.312 INCHES IN; Thread Provision: UNTHREADED. 11 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.