The Retainer,optical Element, cataloged under National Stock Number 1240-01-073-5910, is classified within Federal Supply Class 1240 (Optical Sighting and Ranging Equipment) of the Fire Control Equipment group. The manufacturer of record is Us Army Aviation and Missile Command. Government technical data includes 17 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1240-01-073-5910 |
| Primary Part Number | 11507566 |
| Item Name | Retainer,optical Element |
| FSC / FSG | 1240 / 12 — Optical Sighting and Ranging Equipment |
| Manufacturer | Us Army Aviation and Missile Command |
| Status | ACTIVE |
| Hole or Slot Quantity | 4 |
| Drive Type | SLOTTED |
| Drive Facility Angular Spacing in Deg | 90.0 |
| Hole Chamfer Diameter | 0.270 INCHES MINIMUM AND 0.275 INCHES MAXIMUM IN |
| Style Designator | RECESSED |
| Setscrew Notch | NOT PROVIDED |
| Recess Depth | 0.025 INCHES MINIMUM AND 0.035 INCHES MAXIMUM IN |
| Recess Diameter | 0.270 INCHES MINIMUM AND 0.275 INCHES MAXIMUM IN |
| Guide Location | EDGE OPPOSITE DRIVE EDGE |
| Hole Chamfer Angle in Deg | 0.0 |
| Thread Size | 0.375 IN.-32 IN |
| Guide Design | THREAD RELIEF |
| Depth | 0.025 INCHES MINIMUM AND 0.035 INCHES MAXIMUM IN |
| Width | 0.030 INCHES MINIMUM AND 0.040 INCHES MAXIMUM IN |
| Internal Annular Serration | NOT PROVIDED |
| Material | STEEL CORROSION RESISTING |
| Hole Diameter | 0.270 INCHES MINIMUM AND 0.275 INCHES MAXIMUM 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 1240-01-073-5910 is a Retainer,optical Element, manufactured by Us Army Aviation and Missile Command, classified under FSC 1240, Optical Sighting and Ranging Equipment. Status: active.
NSN 1240-01-073-5910 has 2 manufacturer part numbers on file: 11507566 (Wego Precision Machine, Inc.), 11507566 (Us Army Aviation and Missile Command).
Key specifications for 11507566: Hole or Slot Quantity: 4; Drive Type: SLOTTED; Drive Facility Angular Spacing in Deg: 90.0; Hole Chamfer Diameter: 0.270 INCHES MINIMUM AND 0.275 INCHES MAXIMUM IN. 17 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.