The Adjuster,collimator Leveling, cataloged under National Stock Number 6650-01-021-1237, is classified within Federal Supply Class 6650 (Optical Instruments, Test Equipment, Components and Accessories) of the Instruments and Laboratory Equipment group. The manufacturer of record is Gaertner Scientific Corporation. Government technical data includes 1 specification, 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 | 6650-01-021-1237 |
| Primary Part Number | 8551-20 |
| Item Name | Adjuster,collimator Leveling |
| FSC / FSG | 6650 / 66 — Optical Instruments, Test Equipment, Components and Accessories |
| Manufacturer | Gaertner Scientific Corporation |
| Status | ACTIVE |
| General Characteristics Item Description | STEEL,NICKEL PLATED FINISH,3.531 IN. LG,0.875 IN. DIA IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 8551-20 PRIMARY | Gaertner Scientific Corporation (USA) |
NSN 6650-01-021-1237 is a Adjuster,collimator Leveling, manufactured by Gaertner Scientific Corporation, classified under FSC 6650, Optical Instruments, Test Equipment, Components and Accessories. Status: active.
NSN 6650-01-021-1237 has 1 manufacturer part number on file: 8551-20 (Gaertner Scientific Corporation).
1 possible match (shared part number, not a government interchangeability claim): 5998-01-376-9365. Verify interchangeability with system specifications before substitution.
Key specifications for 8551-20: General Characteristics Item Description: STEEL,NICKEL PLATED FINISH,3.531 IN. LG,0.875 IN. DIA IN. 1 specification is 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.
NSN 6650-01-021-1237 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.