PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

37021Nut,self-Locking,single Ball Sea

Fastenal Company Dba Fastenal Co · NSN 5310-01-599-8099 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-01-599-8099 — this item is cataloged by the U.S. Government under National Stock Number 5310-01-599-8099. Primary manufacturer part number: 37021.
Features
  • Nut,self-Locking,single Ball Sea — FSC 5310
  • Nut Height: 0.329 INCHES MINIMUM AND 0.359 INCHES MAXIMUM IN
  • Nominal Thread Size: 0.313 INCHES IN
  • Width Across Flats: 0.489 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN
  • Thread Class: 2B
  • Thread Direction: RIGHT-HAND
  • Thread Series: UNIFIED NATIONAL COARSE (UNC)
  • Thread Quantity Per Inch: 18
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Plastic Nylon Locking Insert construction
General Description

The Nut,self-Locking,single Ball Sea, cataloged under National Stock Number 5310-01-599-8099, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Fastenal Company Dba Fastenal Co. Government technical data includes 12 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 9 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5310-01-599-8099
Primary Part Number37021
Item NameNut,self-Locking,single Ball Sea
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerFastenal Company Dba Fastenal Co
StatusACTIVE
Nut Height0.329 INCHES MINIMUM AND 0.359 INCHES MAXIMUM IN
Nominal Thread Size0.313 INCHES IN
Width Across Flats0.489 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN
Thread Class2B
Thread DirectionRIGHT-HAND
Thread SeriesUNIFIED NATIONAL COARSE (UNC)
Thread Quantity Per Inch18
Nut StyleSINGLE BALL SEAT, HEXAGON
MaterialPLASTIC NYLON LOCKING INSERT
Surface Treatment Document and ClassificationASTM F1941, FE/ZN 3AT ASSN STD SINGLE TREATMENT RESPONSE OVERALL
Surface TreatmentZINC OVERALL
MaterialSTEEL OVERALL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 9
3930-00-136-5053 INTERCHANGEABLE
Cylinder Hydraulic
3413-00-326-801337-021 INTERCHANGEABLE
Drilling Machine,radial
Dumore Corporation
5930-00-401-0157 INTERCHANGEABLE
Switch Subassembly
5945-00-557-274637021 INTERCHANGEABLE
Relay,thermal
Thales Usa, Inc. Div Air Mobility Solutions ("ams")
4720-00-737-0837FC37552 INTERCHANGEABLE
Hose Assembly,nonmetallic
Federal Mogul Corp Sub Wagner Brake Moog Automotive Div
3825-01-188-5445 INTERCHANGEABLE
Lip,hopper
5930-01-252-1439935268-2 INTERCHANGEABLE
Switch,push
Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp
3040-01-305-005037021 INTERCHANGEABLE
Brake,dual Disk
Scott Industrial Systems, Inc
5975-01-390-37753702-1 INTERCHANGEABLE
Box Connector,electrical
Raco, a Division of Hubbell Incorporated(delaware)
Cross-Reference Index
Part NumberManufacturer
37021 PRIMARY Fastenal Company Dba Fastenal Co (USA)
12759-01288 Fastenal Company Dba Fastenal Co (USA)
Related Parts
3930-00-136-5053INTERCHANGEABLE
CYLINDER HYDRAULIC
3413-00-326-8013INTERCHANGEABLE
DRILLING MACHINE,RADIAL
37-021
5930-00-401-0157INTERCHANGEABLE
SWITCH SUBASSEMBLY
5945-00-557-2746INTERCHANGEABLE
RELAY,THERMAL
37021
4720-00-737-0837INTERCHANGEABLE
HOSE ASSEMBLY,NONMETALLIC
FC37552
3825-01-188-5445INTERCHANGEABLE
LIP,HOPPER
5930-01-252-1439INTERCHANGEABLE
SWITCH,PUSH
935268-2
3040-01-305-0050INTERCHANGEABLE
BRAKE,DUAL DISK
37021
5975-01-390-3775INTERCHANGEABLE
BOX CONNECTOR,ELECTRICAL
3702-1

Frequently Asked Questions

What is NSN 5310-01-599-8099?

NSN 5310-01-599-8099 is a Nut,self-Locking,single Ball Sea, manufactured by Fastenal Company Dba Fastenal Co, classified under FSC 5310 (No Item Name Available). Status: active.

What are the part numbers for NSN 5310-01-599-8099?

NSN 5310-01-599-8099 has 2 cross-referenced part numbers: 37021 (Fastenal Company Dba Fastenal Co), 12759-01288 (Fastenal Company Dba Fastenal Co).

What NSN replaces 5310-01-599-8099?

There are 9 known substitutes for 5310-01-599-8099: 3930-00-136-5053, 3413-00-326-8013, 5930-00-401-0157 and 6 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 37021?

Key specifications for 37021: Nut Height: 0.329 INCHES MINIMUM AND 0.359 INCHES MAXIMUM IN; End Item Identification: STRYKER; Nominal Thread Size: 0.313 INCHES IN; Width Across Flats: 0.489 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN. 14 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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