PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

20521Nut,self-Locking,hexagon

Onehydraulics, Inc. Dba Onehydraulics-Ltl · NSN 5310-01-391-2749 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-01-391-2749 — this item is cataloged by the U.S. Government under National Stock Number 5310-01-391-2749. Primary manufacturer part number: 20521.
Features
  • Nut,self-Locking,hexagon — FSC 5310
  • 2 verified cross-references
  • Primary manufacturer: Onehydraulics, Inc. Dba Onehydraulics-Ltl
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
General Description

The Nut,self-Locking,hexagon, cataloged under National Stock Number 5310-01-391-2749, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Onehydraulics, Inc. Dba Onehydraulics-Ltl. This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NameNut,self-Locking,hexagon
FSC / FSG5310 — No Item Name Available (FSG 53)
ManufacturersOnehydraulics, Inc. Dba Onehydraulics-Ltl (CAGE 7QMC8); Tulsa Winch, Inc. (CAGE 75096)
Technical Specifications
ParameterValue
NSN5310-01-391-2749
Primary Part Number20521
Item NameNut,self-Locking,hexagon
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerOnehydraulics, Inc. Dba Onehydraulics-Ltl
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 6
4730-00-277-53095710S1-8 INTERCHANGEABLE
Plug,pipe
The Walworth Company
5340-00-559-8763 INTERCHANGEABLE
Clip,spring Tension
5945-00-883-683713217E4066-1 INTERCHANGEABLE
Relay,electromagnetic
Cecom Lr Center
5340-01-124-458520521 INTERCHANGEABLE
Seat,helical Compression Spring
Eaton Corporation Dba Airframe Div Fuel & Motion Control Systems
5331-01-171-631020521 INTERCHANGEABLE
O-Ring
Electro Impulse Laboratory Inc Dba Electro Impulse Inc
4710-01-176-089120714 INTERCHANGEABLE
Tube,metallic
Alcoa/reynolds Metals Company
Cross-Reference Index
Part NumberManufacturer
20521 Onehydraulics, Inc. Dba Onehydraulics-Ltl (USA)
20521 Tulsa Winch, Inc. (USA)
Related Parts
4730-00-277-5309INTERCHANGEABLE
PLUG,PIPE
5710S1-8
5340-00-559-8763INTERCHANGEABLE
CLIP,SPRING TENSION
5945-00-883-6837INTERCHANGEABLE
RELAY,ELECTROMAGNETIC
13217E4066-1
5340-01-124-4585INTERCHANGEABLE
SEAT,HELICAL COMPRESSION SPRING
20521
5331-01-171-6310INTERCHANGEABLE
O-RING
20521
4710-01-176-0891INTERCHANGEABLE
TUBE,METALLIC
20714

Frequently Asked Questions

What is NSN 5310-01-391-2749?

NSN 5310-01-391-2749 is a Nut,self-Locking,hexagon, manufactured by Onehydraulics, Inc. Dba Onehydraulics-Ltl, classified under FSC 5310 (No Item Name Available). Status: active.

What are the part numbers for NSN 5310-01-391-2749?

NSN 5310-01-391-2749 has 2 cross-referenced part numbers: 20521 (Onehydraulics, Inc. Dba Onehydraulics-Ltl), 20521 (Tulsa Winch, Inc.).

What NSN replaces 5310-01-391-2749?

There are 6 known substitutes for 5310-01-391-2749: 4730-00-277-5309, 5340-00-559-8763, 5945-00-883-6837 and 3 more. Verify interchangeability with system specifications before substitution.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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