The Nut,self-Locking,barrel, cataloged under National Stock Number 5310-01-061-3323, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp. Government technical data includes 18 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-061-3323 |
| Primary Part Number | RMLH2577-108 |
| Item Name | Nut,self-Locking,barrel |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
| Status | ACTIVE |
| Lubrication | DRY FILM LUBRICANT |
| Nut Length | 1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416,CLASS 3 FED SPEC 2ND TREATMENT RESPONSE NUT |
| Surface Treatment Document and Classification | QQ-P-416,TYPE II,CLASS 3 FED SPEC 1ST TREATMENT RESPONSE LOCKING INSERT |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Temp Rating | 450.0 FAHRENHEIT NOMINAL DEGF |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.625 INCHES IN |
| Nut Diameter | 0.911 INCHES NOMINAL IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Nut Height | 0.844 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Nut Style | FLOATING SELF-LOCKING BARREL |
| Thread Class | 3B |
| Thread Quantity Per Inch | 18 |
| Material | STEEL OVERALL |
| Barrel Height | 0.640 INCHES MINIMUM AND 0.650 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 | F |
| Part Number | Manufacturer |
|---|---|
| RMLH2577-108 PRIMARY | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp (USA) |
| RMLH2577-108 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| 5310PL2215620 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| RMLH2577-108 | 3/2 Design control — primary reference U.S. Government activity |
| RMLH2577-108 | 5/9 Secondary reference Harvard Industries Inc |
NSN 5310-01-061-3323 is a Nut,self-Locking,barrel, manufactured by Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-061-3323 has 2 manufacturer part numbers on file: RMLH2577-108 (Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp), RMLH2577-108 (Sps Technologies, Llc Dba PB Fasteners).
Key specifications for RMLH2577-108: Lubrication: DRY FILM LUBRICANT; Nut Length: 1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-416,CLASS 3 FED SPEC 2ND TREATMENT RESPONSE NUT; Surface Treatment Document and Classification: QQ-P-416,TYPE II,CLASS 3 FED SPEC 1ST TREATMENT RESPONSE LOCKING INSERT. 18 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.