The Nut,self-Locking,round, cataloged under National Stock Number 5310-01-687-2136, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Fatigue Technology, Inc. Government technical data includes 13 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-687-2136 |
| Primary Part Number | TLDNG-6-3-S-18 |
| Item Name | Nut,self-Locking,round |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Fatigue Technology, Inc |
| Status | ACTIVE |
| Surface Treatment Document and Classification | ASTM-A-967 ASSN STD SINGLE TREATMENT RESPONSE NUT |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Material Document and Classification | QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE NUT |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.3750 INCHES IN |
| Nut Diameter | 0.5181 INCHES MINIMUM AND 0.5208 INCHES MAXIMUM IN |
| Locking Feature | FREE-RUNNING ALL METAL DESIGN |
| Nut Thickness | 1.698 INCHES MINIMUM AND 1.757 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE NUT |
| Nut Style | ROUND |
| Thread Class | 3B |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP 304 NUT |
| 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 |
|---|---|
| TLDNG-6-3-S-18 PRIMARY | Fatigue Technology, Inc (USA) |
| Reference | Meaning |
|---|---|
| C21046U6-18 | 1/2 Source control — Government-approved source U.S. Government activity |
| C21046 | D/9 Drawing number reference only U.S. Government activity |
NSN 5310-01-687-2136 is a Nut,self-Locking,round, manufactured by Fatigue Technology, Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-687-2136 has 1 manufacturer part number on file: TLDNG-6-3-S-18 (Fatigue Technology, Inc).
Key specifications for TLDNG-6-3-S-18: Surface Treatment Document and Classification: ASTM-A-967 ASSN STD SINGLE TREATMENT RESPONSE NUT; Thread Series: UNIFIED NATIONAL JOINT FINE (UNJF); Material Document and Classification: QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE NUT; Thread Direction: RIGHT-HAND. 13 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.