PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

2556-1Nut,plain,square

Raytheon Company Dba Raytheon · NSN 5310-00-945-0538 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-00-945-0538 — this item is cataloged by the U.S. Government under National Stock Number 5310-00-945-0538. Primary manufacturer part number: 2556-1.
Features
  • Nut,plain,square — FSC 5310
  • Thread Direction: RIGHT-HAND
  • Bearing Surface Type: FLAT
  • Thread Series: UNIFIED NATIONAL COARSE (UNC)
  • Thread Quantity Per Inch: 20
  • Nominal Thread Size: 0.250 INCHES IN
  • Thread Class: 2B
  • Nut Style: SQUARE
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Comp 1548 Overall construction
General Description

The Nut,plain,square, cataloged under National Stock Number 5310-00-945-0538, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Raytheon Company Dba Raytheon. Government technical data includes 12 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5310-00-945-0538
Primary Part Number2556-1
Item NameNut,plain,square
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerRaytheon Company Dba Raytheon
StatusACTIVE
Thread DirectionRIGHT-HAND
Bearing Surface TypeFLAT
Thread SeriesUNIFIED NATIONAL COARSE (UNC)
Thread Quantity Per Inch20
Nominal Thread Size0.250 INCHES IN
Thread Class2B
Nut StyleSQUARE
Width Across Flats1.000 INCHES NOMINAL IN
Nut Height0.188 INCHES NOMINAL IN
Surface TreatmentCADMIUM OVERALL
MaterialSTEEL COMP 1548 OVERALL
Material Document and ClassificationQQ-S-634 FED SPEC ALL MATERIAL RESPONSES OVERALL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
3110-00-155-900388BIC02 INTERCHANGEABLE
Bearing,ball,annular
Timken Co Div the Timken Company
3110-00-198-1050 INTERCHANGEABLE
Ball,bearing
4320-00-218-4346H44 INTERCHANGEABLE
Ring,lantern
Circor Naval Solutions Llc Dba Warren Pumps
6145-00-238-3409 INTERCHANGEABLE
Wire,electrical
5133-00-262-2180 INTERCHANGEABLE
Drill,twist
3455-00-567-1370 INTERCHANGEABLE
File,rotary
4720-00-676-79362556-6 INTERCHANGEABLE
Hose,nonmetallic
Danfoss Power Solutions II, Llc
5999-00-976-5713H44 INTERCHANGEABLE
Heater,thermal Release
Siemens Energy and Automation Inc Siemens Furnas Controls Div
5961-01-068-8246U3003327-01 INTERCHANGEABLE
Rectifier,semiconductor Device
New Bedford Panoramex Corp. Dba New Bedford Panoramex Corp
4330-01-081-704925561 INTERCHANGEABLE
Filter,fluid
Pall Aeropower Corp Sub of Pall Corp Mectron Industries Div
Cross-Reference Index
Part NumberManufacturer
2556-1 PRIMARY Raytheon Company Dba Raytheon (USA)
6W1971 Lockheed Martin Corporation Div Lockheed Martin Information Systems & Global Solutions (USA)
H44 Zero Stantron (USA)
Related Parts
3110-00-155-9003INTERCHANGEABLE
BEARING,BALL,ANNULAR
88BIC02
3110-00-198-1050INTERCHANGEABLE
BALL,BEARING
4320-00-218-4346INTERCHANGEABLE
RING,LANTERN
H44
6145-00-238-3409INTERCHANGEABLE
WIRE,ELECTRICAL
5133-00-262-2180INTERCHANGEABLE
DRILL,TWIST
3455-00-567-1370INTERCHANGEABLE
FILE,ROTARY
4720-00-676-7936INTERCHANGEABLE
HOSE,NONMETALLIC
2556-6
5999-00-976-5713INTERCHANGEABLE
HEATER,THERMAL RELEASE
H44
5961-01-068-8246INTERCHANGEABLE
RECTIFIER,SEMICONDUCTOR DEVICE
U3003327-01
4330-01-081-7049INTERCHANGEABLE
FILTER,FLUID
25561
4730-01-273-3672INTERCHANGEABLE
CLAMP,HOSE
HF44SS
2590-01-419-6278INTERCHANGEABLE
REEL,CABLE
25561

Frequently Asked Questions

What is NSN 5310-00-945-0538?

NSN 5310-00-945-0538 is a Nut,plain,square, manufactured by Raytheon Company Dba Raytheon, classified under FSC 5310 (No Item Name Available). Status: active.

What are the part numbers for NSN 5310-00-945-0538?

NSN 5310-00-945-0538 has 3 cross-referenced part numbers: 2556-1 (Raytheon Company Dba Raytheon), 6W1971 (Lockheed Martin Corporation Div Lockheed Martin Information Systems & Global Solutions), H44 (Zero Stantron).

What NSN replaces 5310-00-945-0538?

There are 12 known substitutes for 5310-00-945-0538: 3110-00-155-9003, 3110-00-198-1050, 4320-00-218-4346 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 2556-1?

Key specifications for 2556-1: Thread Direction: RIGHT-HAND; Bearing Surface Type: FLAT; Thread Series: UNIFIED NATIONAL COARSE (UNC); Thread Quantity Per Inch: 20. 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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