PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

15203Nut,plain,single Ball Seat,hexag

Northwestern Tools, Inc. · NSN 5310-01-134-5558 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-01-134-5558 — this item is cataloged by the U.S. Government under National Stock Number 5310-01-134-5558. Primary manufacturer part number: 15203.
Features
  • Nut,plain,single Ball Seat,hexag — FSC 5310
  • Material: STEEL OVERALL
  • Width Across Flats: 0.688 INCHES NOMINAL IN
  • Thread Series: UNIFIED NATIONAL COARSE (UNC)
  • Nominal Thread Size: 0.375 INCHES IN
  • Thread Quantity Per Inch: 16
  • Nut Style: SINGLE BALL SEAT, HEXAGON
  • Thread Direction: RIGHT-HAND
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Overall construction
General Description

The Nut,plain,single Ball Seat,hexag, cataloged under National Stock Number 5310-01-134-5558, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Northwestern Tools, Inc.. Government technical data includes 9 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. 10 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5310-01-134-5558
Primary Part Number15203
Item NameNut,plain,single Ball Seat,hexag
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerNorthwestern Tools, Inc.
StatusACTIVE
MaterialSTEEL OVERALL
Width Across Flats0.688 INCHES NOMINAL IN
Thread SeriesUNIFIED NATIONAL COARSE (UNC)
Nominal Thread Size0.375 INCHES IN
Thread Quantity Per Inch16
Nut StyleSINGLE BALL SEAT, HEXAGON
Thread DirectionRIGHT-HAND
Thread Class2B
Surface TreatmentOXIDE OVERALL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 10
5940-00-089-0141 INTERCHANGEABLE
Terminal,feedthru
4820-00-125-551115203 INTERCHANGEABLE
Valve,safety Relief
Collins Engine Nozzles, Inc
5305-00-393-2053 INTERCHANGEABLE
Screw,adjustment
5950-00-431-32169140-0237 INTERCHANGEABLE
Coil,radio Frequency
Keysight Technologies Inc
5342-00-673-78701775826 INTERCHANGEABLE
Bellows,protection
Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier
5120-00-791-0031FN-3/8 INTERCHANGEABLE
Adapter,torque Wrench
Ryeson Corporation Div Sturtevant Richmont
5962-01-222-5325OP16BZ/883 INTERCHANGEABLE
Microcircuit,linear
Analog Devices, Inc. Div Santa Clara Site
5340-01-383-6019 INTERCHANGEABLE
Catch,clamping
7025-01-610-856515203 INTERCHANGEABLE
Interface Unit,automatic Data Pr
Extreme Networks, Inc
6150-01-663-385915203 INTERCHANGEABLE
Cable Assembly,power,electrical
Hdt Expeditionary Systems Inc
Cross-Reference Index
Part NumberManufacturer
SFN38 Northwestern Tools, Inc. (USA)
15203 PRIMARY Northwestern Tools, Inc. (USA)
Related Parts
5940-00-089-0141INTERCHANGEABLE
TERMINAL,FEEDTHRU
4820-00-125-5511INTERCHANGEABLE
VALVE,SAFETY RELIEF
15203
5305-00-393-2053INTERCHANGEABLE
SCREW,ADJUSTMENT
5950-00-431-3216INTERCHANGEABLE
COIL,RADIO FREQUENCY
9140-0237
5342-00-673-7870INTERCHANGEABLE
BELLOWS,PROTECTION
1775826
5120-00-791-0031INTERCHANGEABLE
ADAPTER,TORQUE WRENCH
FN-3/8
5962-01-222-5325INTERCHANGEABLE
MICROCIRCUIT,LINEAR
OP16BZ/883
5340-01-383-6019INTERCHANGEABLE
CATCH,CLAMPING
7025-01-610-8565INTERCHANGEABLE
INTERFACE UNIT,AUTOMATIC DATA PR
15203
6150-01-663-3859INTERCHANGEABLE
CABLE ASSEMBLY,POWER,ELECTRICAL
15203

Frequently Asked Questions

What is NSN 5310-01-134-5558?

NSN 5310-01-134-5558 is a Nut,plain,single Ball Seat,hexag, manufactured by Northwestern Tools, Inc., classified under FSC 5310 (No Item Name Available). Status: active.

What are the part numbers for NSN 5310-01-134-5558?

NSN 5310-01-134-5558 has 2 cross-referenced part numbers: SFN38 (Northwestern Tools, Inc.), 15203 (Northwestern Tools, Inc.).

What NSN replaces 5310-01-134-5558?

There are 10 known substitutes for 5310-01-134-5558: 5940-00-089-0141, 4820-00-125-5511, 5305-00-393-2053 and 7 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 15203?

Key specifications for 15203: Material: STEEL OVERALL; Width Across Flats: 0.688 INCHES NOMINAL IN; Special Features: WASHER OUTSIDE DIAMETER: 0.875 INCH NOM.,WASHER THICKNESS: AA0.125 INCH NOM. IN; Thread Series: UNIFIED NATIONAL COARSE (UNC). 10 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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