The Washer,flat, cataloged under National Stock Number 5310-01-173-3630, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-173-3630 |
| Primary Part Number | 4M27C4 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN |
| Material Document and Classification | MIL-S-5059,COND ANNEALED MIL SPEC 1ST MATERIAL RESPONSE OR QQ-S-763,COND ANNEALED FED SPEC 1ST MATERIAL RESPONSE OR MIL-T-8506,COND ANNEALED MIL SPEC 2ND MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | PASSIVATE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 302 OR STEEL COMP 304 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.128 INCHES MINIMUM AND 0.138 INCHES MAXIMUM IN |
| Thickness | 0.029 INCHES MINIMUM AND 0.035 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 |
| Part Number | Manufacturer |
|---|---|
| 4M27C4 | All Power Manufacturing Co. (USA) |
| 4M27C4 PRIMARY | The Boeing Company Div Defense (USA) |
| 4M27C4 | Tect Hypervelocity, Inc. (USA) |
| 4M27C4 | Anillo Industries Llc (USA) |
| Reference | Meaning |
|---|---|
| 4M27C4 | 5/9 Secondary reference Pioneer Machine Products Inc. |
| 4M27C4 | 5/2 Secondary reference U.S. Government activity |
| 10110039 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
NSN 5310-01-173-3630 is a Washer,flat, manufactured by The Boeing Company Div Defense, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-173-3630 has 4 manufacturer part numbers on file: 4M27C4 (All Power Manufacturing Co.), 4M27C4 (The Boeing Company Div Defense), 4M27C4 (Tect Hypervelocity, Inc.), 4M27C4 (Anillo Industries Llc).
Key specifications for 4M27C4: Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN; Material Document and Classification: MIL-S-5059,COND ANNEALED MIL SPEC 1ST MATERIAL RESPONSE OR QQ-S-763,COND ANNEALED FED SPEC 1ST MATERIAL RESPONSE OR MIL-T-8506,COND ANNEALED MIL SPEC 2ND MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR. 10 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.