PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

20487Nut,self-Locking,hexagon

Itw Gse Inc. · NSN 5310-01-499-3569 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-01-499-3569 — this item is cataloged by the U.S. Government under National Stock Number 5310-01-499-3569. Primary manufacturer part number: 20487.
Features
  • Nut,self-Locking,hexagon — FSC 5310
  • Thread Series: UNIFIED NATIONAL COARSE (UNC)
  • Bearing Surface Type: FLAT
  • Nominal Thread Size: 0.312 INCHES IN
  • Material: STEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 305 OR STEEL COMP 384 OR STEEL COMP 302B OR STEEL COMP 303MA OR STEEL COMP 303SE OR STEEL COMP 304L OVERALL
  • Width Across Flats: 0.502 INCHES NOMINAL IN
  • Thread Class: 2B
  • Temp Rating: 250.0 FAHRENHEIT MAXIMUM DEGF
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Comp 302 or Steel Comp 303 or Steel Comp 304 or Steel Comp 305 or Steel Comp 384 or Steel Comp 302b or Steel Comp 303MA or Steel Comp 303SE or Steel Comp 304l Overall construction
General Description

The Nut,self-Locking,hexagon, cataloged under National Stock Number 5310-01-499-3569, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Itw Gse Inc.. Government technical data includes 12 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 5 commercial cross-references from 5 manufacturers, enabling identification through both NSN and commercial part number lookups. 7 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5310-01-499-3569
Primary Part Number20487
Item NameNut,self-Locking,hexagon
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerItw Gse Inc.
StatusACTIVE
Thread SeriesUNIFIED NATIONAL COARSE (UNC)
Bearing Surface TypeFLAT
Nominal Thread Size0.312 INCHES IN
MaterialSTEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 305 OR STEEL COMP 384 OR STEEL COMP 302B OR STEEL COMP 303MA OR STEEL COMP 303SE OR STEEL COMP 304L OVERALL
Width Across Flats0.502 INCHES NOMINAL IN
Thread Class2B
Temp Rating250.0 FAHRENHEIT MAXIMUM DEGF
Thread Quantity Per Inch18
Nut StyleHEXAGON
Thread DirectionRIGHT-HAND
Locking FeaturePREVAILING TORQUE WITH NONMETALLIC INSERT
Nut Height0.359 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 7
7690-00-083-575720487 INTERCHANGEABLE
Decal
Northrop Grumman Systems Corporation Dba Aerospace Systems Div Aeronautics Systems
5935-00-199-2635 INTERCHANGEABLE
Connector,plug,electrical
3120-01-025-715020487 INTERCHANGEABLE
Bearing,sleeve
Eaton Corporation Dba Airframe Div Fuel & Motion Control Systems
5331-01-058-402520487 INTERCHANGEABLE
O-Ring
Rubbercraft Corporation of California, Ltd. Dba Rubbercraft Corp
3020-01-315-410620487-1 INTERCHANGEABLE
Pulley,groove
United States Department of the Navy Dba Naval Surface Warfare Center Panama City
4820-01-522-060920487 INTERCHANGEABLE
Piston,valve
Leslie Controls, Inc. Dba Leslie Controls Inc
5310-01-589-46441170861 INTERCHANGEABLE
Nut,plain,hexagon
Patriot3, Inc. Dba Patriot3 Inc
Cross-Reference Index
Part NumberManufacturer
20487 PRIMARY Itw Gse Inc. (USA)
3392AS2732-36 PRIMARY Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier (USA)
91831A030 Mcmaster-Carr Supply Company (USA)
20487 Gse Holdings Inc. Dba Itw Military Gse Div Hobart Ground Systems (USA)
3392AS2732-36 Mcmaster-Carr Supply Co (USA)
Related Parts
7690-00-083-5757INTERCHANGEABLE
DECAL
20487
5935-00-199-2635INTERCHANGEABLE
CONNECTOR,PLUG,ELECTRICAL
3120-01-025-7150INTERCHANGEABLE
BEARING,SLEEVE
20487
5331-01-058-4025INTERCHANGEABLE
O-RING
20487
3020-01-315-4106INTERCHANGEABLE
PULLEY,GROOVE
20487-1
4820-01-522-0609INTERCHANGEABLE
PISTON,VALVE
20487
5310-01-589-4644INTERCHANGEABLE
NUT,PLAIN,HEXAGON
1170861

Frequently Asked Questions

What is NSN 5310-01-499-3569?

NSN 5310-01-499-3569 is a Nut,self-Locking,hexagon, manufactured by Itw Gse Inc., classified under FSC 5310 (No Item Name Available). Status: active.

What are the part numbers for NSN 5310-01-499-3569?

NSN 5310-01-499-3569 has 5 cross-referenced part numbers: 20487 (Itw Gse Inc.), 3392AS2732-36 (Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier), 91831A030 (Mcmaster-Carr Supply Company), 20487 (Gse Holdings Inc. Dba Itw Military Gse Div Hobart Ground Systems), 3392AS2732-36 (Mcmaster-Carr Supply Co).

What NSN replaces 5310-01-499-3569?

There are 7 known substitutes for 5310-01-499-3569: 7690-00-083-5757, 5935-00-199-2635, 3120-01-025-7150 and 4 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 20487?

Key specifications for 20487: Thread Series: UNIFIED NATIONAL COARSE (UNC); Bearing Surface Type: FLAT; Nominal Thread Size: 0.312 INCHES IN; Material: STEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 305 OR STEEL COMP 384 OR STEEL COMP 302B OR STEEL COMP 303MA OR STEEL COMP 303SE OR STEEL COMP 304L OVERALL. 13 total characteristics are documented in the Federal Logistics Information System.

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