The Retainer,optical Element, cataloged under National Stock Number 1240-00-157-9642, is classified within Federal Supply Class 1240 (Optical Sighting and Ranging Equipment) of the Fire Control Equipment group. The manufacturer of record is Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier. Government technical data includes 13 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1240-00-157-9642 |
| Primary Part Number | 481130PC1 |
| Item Name | Retainer,optical Element |
| FSC / FSG | 1240 / 12 — Optical Sighting and Ranging Equipment |
| Manufacturer | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| Status | ACTIVE |
| Hole Chamfer Diameter | 1.820 INCHES NOMINAL IN |
| Style Designator | RECESSED |
| Setscrew Notch | NOT PROVIDED |
| Recess Depth | 0.195 INCHES NOMINAL IN |
| Recess Diameter | 1.772 INCHES NOMINAL IN |
| Guide Location | EDGE OPPOSITE DRIVE EDGE |
| Hole Chamfer Angle in Deg | 45.0 |
| Thread Size | 2.000 IN.-32 IN |
| Guide Design | THREAD CHAMFER |
| Surface Treatment | FNAAF0 |
| Internal Annular Serration | NOT PROVIDED |
| Material | COPPER ALLOY |
| Hole Diameter | 1.718 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 1240-00-157-9642 is a Retainer,optical Element, manufactured by Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier, classified under FSC 1240, Optical Sighting and Ranging Equipment. Status: active.
NSN 1240-00-157-9642 has 2 manufacturer part numbers on file: 481130PC1 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier), 481130PC1 (Lockheed Martin Corporation Div Rms - Mitchel Field).
Key specifications for 481130PC1: Hole Chamfer Diameter: 1.820 INCHES NOMINAL IN; Style Designator: RECESSED; Setscrew Notch: NOT PROVIDED; Overall Length: 0.309 INCHES NOMINAL IN. 13 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.