The Washer,recessed, cataloged under National Stock Number 5310-00-009-7628, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Mid-America Aerotech, Llc. Government technical data includes 7 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-009-7628 |
| Primary Part Number | 20944 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Mid-America Aerotech, Llc |
| Status | ACTIVE |
| Style Designator | RECESSED |
| Outside Diameter | 0.615 INCHES NOMINAL IN |
| Recess Depth | 0.265 INCHES NOMINAL IN |
| Material Thickness | 0.040 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL COMP 416 OVERALL |
| Hole Diameter | 0.252 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 |
| Part Number | Manufacturer |
|---|---|
| 20944 PRIMARY | Mid-America Aerotech, Llc (USA) |
| Reference | Meaning |
|---|---|
| 20944 | 5/9 Secondary reference U.S. Government activity |
| 20944 | 5/9 Secondary reference Moog Inc Div Moog Inc., Space and Defense - Salt Lake City |
| 20944 | 5/9 Secondary reference E-Systems Inc Montek Div Fluid Controls Opns |
NSN 5310-00-009-7628 is a Washer,recessed, manufactured by Mid-America Aerotech, Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-009-7628 has 1 manufacturer part number on file: 20944 (Mid-America Aerotech, Llc).
1 possible match (shared part number, not a government interchangeability claim): 5950-01-335-3362. Verify interchangeability with system specifications before substitution.
Key specifications for 20944: Overall Height: 0.305 INCHES NOMINAL IN; Style Designator: RECESSED; Outside Diameter: 0.615 INCHES NOMINAL IN; Recess Depth: 0.265 INCHES NOMINAL IN. 7 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.