PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

S145Key,socket Head Screw

L3harris Cincinnati Electronics Corporation · NSN 5120-00-326-2281 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-00-326-2281 — this item is cataloged by the U.S. Government under National Stock Number 5120-00-326-2281. Primary manufacturer part number: S145.
Features
  • Key,socket Head Screw — FSC 5120
  • Style Designator: L-HANDLE
  • Short Arm Length: 0.750 INCHES NOMINAL IN
  • Wrenching Surface Size: 0.145 INCHES NOMINAL BOTH ENDS IN
  • Long Arm Length: 2.250 INCHES NOMINAL IN
  • Wrenching Surface Flute Quantity: 6
  • Wrenching Surface Shape: SPLINE BOTH ENDS EXTERNAL
  • Material: STEEL COMP 1052 OVERALL
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Comp 1052 Overall construction
General Description

The Key,socket Head Screw, cataloged under National Stock Number 5120-00-326-2281, is classified within Federal Supply Class 5120 (No Item Name Available) of the Hand Tools group. The primary manufacturer of record is L3harris Cincinnati Electronics Corporation. Government technical data includes 8 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 5 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5120-00-326-2281
Primary Part NumberS145
Item NameKey,socket Head Screw
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerL3harris Cincinnati Electronics Corporation
StatusACTIVE
Style DesignatorL-HANDLE
Short Arm Length0.750 INCHES NOMINAL IN
Wrenching Surface Size0.145 INCHES NOMINAL BOTH ENDS IN
Long Arm Length2.250 INCHES NOMINAL IN
Wrenching Surface Flute Quantity6
Wrenching Surface ShapeSPLINE BOTH ENDS EXTERNAL
MaterialSTEEL COMP 1052 OVERALL
Features ProvidedNONSPARKING
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 5
9540-00-148-4793 INTERCHANGEABLE
Beam,structural
3455-00-552-4277 INTERCHANGEABLE
Cutter,milling,end
5305-01-203-6444S145 INTERCHANGEABLE
Screw,cap,hexagon Head
Cummins Inc.
9905-01-207-52151211218-296 INTERCHANGEABLE
Plate,identification
Arkwin Industries, Inc. Dba Arkwin Industries Inc
3460-01-354-6921S-145 INTERCHANGEABLE
Sleeve,expansion Mandrel
Sunnen Products Co
Cross-Reference Index
Part NumberManufacturer
S145 PRIMARY L3harris Cincinnati Electronics Corporation (USA)
Related Parts
9540-00-148-4793INTERCHANGEABLE
BEAM,STRUCTURAL
3455-00-552-4277INTERCHANGEABLE
CUTTER,MILLING,END
5305-01-203-6444INTERCHANGEABLE
SCREW,CAP,HEXAGON HEAD
S145
9905-01-207-5215INTERCHANGEABLE
PLATE,IDENTIFICATION
1211218-296
3460-01-354-6921INTERCHANGEABLE
SLEEVE,EXPANSION MANDREL
S-145

Frequently Asked Questions

What is NSN 5120-00-326-2281?

NSN 5120-00-326-2281 is a Key,socket Head Screw, manufactured by L3harris Cincinnati Electronics Corporation, classified under FSC 5120 (No Item Name Available). Status: active.

What are the part numbers for NSN 5120-00-326-2281?

NSN 5120-00-326-2281 has 1 cross-referenced part number: S145 (L3harris Cincinnati Electronics Corporation).

What NSN replaces 5120-00-326-2281?

There are 5 known substitutes for 5120-00-326-2281: 9540-00-148-4793, 3455-00-552-4277, 5305-01-203-6444 and 2 more. Verify interchangeability with system specifications before substitution.

What are the specifications of S145?

Key specifications for S145: Style Designator: L-HANDLE; Short Arm Length: 0.750 INCHES NOMINAL IN; Wrenching Surface Size: 0.145 INCHES NOMINAL BOTH ENDS IN; Long Arm Length: 2.250 INCHES NOMINAL IN. 9 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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