PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

1U7563Key,socket Head Screw

Caterpillar Inc Div Caterpillar Defense · NSN 5120-01-291-3566 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-291-3566 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-291-3566. Primary manufacturer part number: 1U7563.
Features
  • Key,socket Head Screw — FSC 5120
  • Features Provided: LONG SERIES
  • Wrenching Surface Size: 4.0 MILLIMETERS NOMINAL BOTH ENDS MM
  • Style Designator: L-HANDLE
  • Surface Treatment: ZINC OVERALL
  • Material: STEEL OVERALL
  • Wrenching Surface Shape: HEXAGON BOTH ENDS EXTERNAL
  • 3 verified cross-references
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Overall construction
General Description

The Key,socket Head Screw, cataloged under National Stock Number 5120-01-291-3566, is classified within Federal Supply Class 5120 (No Item Name Available) of the Hand Tools group. The primary manufacturer of record is Caterpillar Inc Div Caterpillar Defense. Government technical data includes 6 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
NSN5120-01-291-3566
Primary Part Number1U7563
Item NameKey,socket Head Screw
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerCaterpillar Inc Div Caterpillar Defense
StatusACTIVE
Features ProvidedLONG SERIES
Wrenching Surface Size4.0 MILLIMETERS NOMINAL BOTH ENDS MM
Style DesignatorL-HANDLE
Surface TreatmentZINC OVERALL
MaterialSTEEL OVERALL
Wrenching Surface ShapeHEXAGON BOTH ENDS EXTERNAL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
4920-00-015-28497325 INTERCHANGEABLE
Shaft,pinion,signal
Honeywell Limited Dba Honeywell Aerospace Toronto Div Aerospace-Toronto
5305-00-068-0510B1821BH038C100N INTERCHANGEABLE
Screw,cap,hexagon Head
American National Standards Institute Incorporated Dba American National Standards Institute
5935-00-149-3304RE B 49080 INTERCHANGEABLE
Adapter,connector
Naval Ship Systems Command
6695-00-532-8140 INTERCHANGEABLE
Sampler,liquid,automatic
4310-01-010-12787325 A INTERCHANGEABLE
Ring,piston
O. C. Keckley Company
4730-01-224-8402 INTERCHANGEABLE
Ferrule,brazing,tube Fitting
5945-01-244-94630490-0670 INTERCHANGEABLE
Relay,electromagnetic
Keysight Technologies Inc
5950-01-339-6683142608-0001 INTERCHANGEABLE
Coil,electrical
Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp
3030-01-365-37657325 INTERCHANGEABLE
Belt,v
Gates Corporation
3110-01-411-2401W94 INTERCHANGEABLE
Plate,retaining,bearing
Circor Naval Solutions Llc Dba Warren Pumps
Cross-Reference Index
Part NumberManufacturer
1U7563 PRIMARY Caterpillar Inc Div Caterpillar Defense (USA)
7325 Bosch Automotive Service Solutions Inc. (USA)
8710-1755 PRIMARY Agilent Technologies, Inc. Div Agilent Technologies Headquarters (USA)
Related Parts
4920-00-015-2849INTERCHANGEABLE
SHAFT,PINION,SIGNAL
7325
5305-00-068-0510INTERCHANGEABLE
SCREW,CAP,HEXAGON HEAD
B1821BH038C100N
5935-00-149-3304INTERCHANGEABLE
ADAPTER,CONNECTOR
RE B 49080
6695-00-532-8140INTERCHANGEABLE
SAMPLER,LIQUID,AUTOMATIC
4310-01-010-1278INTERCHANGEABLE
RING,PISTON
7325 A
4730-01-224-8402INTERCHANGEABLE
FERRULE,BRAZING,TUBE FITTING
5945-01-244-9463INTERCHANGEABLE
RELAY,ELECTROMAGNETIC
0490-0670
5950-01-339-6683INTERCHANGEABLE
COIL,ELECTRICAL
142608-0001
3030-01-365-3765INTERCHANGEABLE
BELT,V
7325
3110-01-411-2401INTERCHANGEABLE
PLATE,RETAINING,BEARING
W94
6625-01-553-2112INTERCHANGEABLE
TEST SET,ELECTRONIC SYSTEMS
7325
5940-01-559-8872INTERCHANGEABLE
TERMINAL,LUG
7325

Frequently Asked Questions

What is NSN 5120-01-291-3566?

NSN 5120-01-291-3566 is a Key,socket Head Screw, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 5120 (No Item Name Available). Status: active.

What are the part numbers for NSN 5120-01-291-3566?

NSN 5120-01-291-3566 has 3 cross-referenced part numbers: 1U7563 (Caterpillar Inc Div Caterpillar Defense), 7325 (Bosch Automotive Service Solutions Inc.), 8710-1755 (Agilent Technologies, Inc. Div Agilent Technologies Headquarters).

What NSN replaces 5120-01-291-3566?

There are 12 known substitutes for 5120-01-291-3566: 4920-00-015-2849, 5305-00-068-0510, 5935-00-149-3304 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 1U7563?

Key specifications for 1U7563: Features Provided: LONG SERIES; Wrenching Surface Size: 4.0 MILLIMETERS NOMINAL BOTH ENDS MM; Style Designator: L-HANDLE; Surface Treatment: ZINC OVERALL. 6 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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