The Nut,clip-on, cataloged under National Stock Number 5310-01-388-6218, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. Government technical data includes 15 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-388-6218 |
| Primary Part Number | 1B5511 |
| Item Name | Nut,clip-on |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| Surface Treatment Document and Classification | AMS 2411 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF)UNIFIED NATIONAL JOINT FINE (UNJF) |
| Precious Material | SILVER |
| Hardness Rating | 32.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM38.0 ROCKWELL C MAXIMUM |
| Distance From Base to Center of Aperture | 0.400 INCHES NOMINAL0.400 INCHES NOMINAL IN |
| Material Document and Classification | AMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HANDRIGHT-HAND |
| Panel Thickness | 0.160 INCHES NOMINAL0.160 INCHES NOMINAL IN |
| Nominal Thread Size | 0.190 INCHES0.190 INCHES IN |
| Surface Treatment | SILVER OVERALL |
| Precious Material and Location | ON NUT SILVER |
| Nut Style | FLOATINGFLOATING |
| Thread Class | 3B3B |
| Thread Quantity Per Inch | 3232 |
| Material | IRON ALLOY 660 OVERALL |
| 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 |
|---|---|
| 1B5511 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| 751961 | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| Reference | Meaning |
|---|---|
| 185511 | 5/9 Secondary reference Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| F39304-3-2 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
NSN 5310-01-388-6218 is a Nut,clip-on, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-388-6218 has 2 manufacturer part numbers on file: 1B5511 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), 751961 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney).
Key specifications for 1B5511: Surface Treatment Document and Classification: AMS 2411 ASSN STD SINGLE TREATMENT RESPONSE OVERALL; Thread Series: UNIFIED NATIONAL JOINT FINE (UNJF)UNIFIED NATIONAL JOINT FINE (UNJF); Precious Material: SILVER; Hardness Rating: 32.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM38.0 ROCKWELL C MAXIMUM. 15 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.