The Washer,flat, cataloged under National Stock Number 5310-00-688-2035, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Rockwell Collins, Inc. Dba Collins Aerospace Government Systems Div Collins Aerospace - Government Systems. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 8 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-688-2035 |
| Primary Part Number | 310-0740-420 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Rockwell Collins, Inc. Dba Collins Aerospace Government Systems Div Collins Aerospace - Government Systems |
| Status | ACTIVE |
| Overall Diameter | 0.299 INCHES MINIMUM AND 0.319 INCHES MAXIMUM IN |
| Material Document and Classification | QQ-A-250/8 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | ALUMINUM ALLOY 5052 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.182 INCHES MINIMUM AND 0.193 INCHES MAXIMUM IN |
| Thickness | 0.016 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 | F |
| Part Number | Manufacturer |
|---|---|
| NAS620A8L | Anillo Industries Llc (USA) |
| NAS620A8L | Tecno Trade S.r.l. (ITA) |
| NAS620A8L | Leonardo Spa Helicopters Division - Production Site (ITA) |
| NAS620A8L | Northrop Grumman Systems Corporation (USA) |
| NAS620A8L | Moeller Manufacturing & Supply, Llc (USA) |
| NAS620A8L | Superior Washer & Gasket Corp. Dba Superior Washer & Gasket Corp (USA) |
| 310-0740-420 PRIMARY | Rockwell Collins, Inc. Dba Collins Aerospace Government Systems Div Collins Aerospace - Government Systems (USA) |
| NAS620A8L | Aertekno S.r.l. (ITA) |
| Reference | Meaning |
|---|---|
| NAS620A8L | 5/2 Secondary reference U.S. Government activity |
| NAS620A8L | 5/9 Secondary reference Ontic Engineering & Manufacturing, Inc Dba Ontic Us |
| NAS620A8L | 3/2 Design control — primary reference U.S. Government activity |
| 5310PL0192768 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 10121602 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
NSN 5310-00-688-2035 is a Washer,flat, manufactured by Rockwell Collins, Inc. Dba Collins Aerospace Government Systems Div Collins Aerospace - Government Systems, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-688-2035 has 8 manufacturer part numbers on file: NAS620A8L (Anillo Industries Llc), NAS620A8L (Tecno Trade S.r.l.), NAS620A8L (Leonardo Spa Helicopters Division - Production Site), NAS620A8L (Northrop Grumman Systems Corporation), NAS620A8L (Moeller Manufacturing & Supply, Llc) and 3 more.
1 possible match (shared part number, not a government interchangeability claim): 6145-01-146-2562. Verify interchangeability with system specifications before substitution.
Key specifications for 310-0740-420: Overall Diameter: 0.299 INCHES MINIMUM AND 0.319 INCHES MAXIMUM IN; Material Document and Classification: QQ-A-250/8 FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: ROUND. 8 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.