PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

5556Socket,socket Wrench

The Stanley Works Dba Stanley Proto · NSN 5120-01-399-9698 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-399-9698 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-399-9698. Primary manufacturer part number: 5556.
Features
  • Socket,socket Wrench — FSC 5120
  • Style Designator: INTERNAL-INTERNAL
  • Surface Treatment: CHROMIUM OVERALL
  • Drive Surface Size: 0.750 INCHES NOMINAL SINGLE END IN
  • Wrenching Surface Shape: 12 POINT SINGLE END INTERNAL
  • Nondefinitive Spec/std Data: 1 TYPE AND 1 CLASS AND A STYLE
  • Material: STEEL OVERALL
  • Wrenching Surface Size: 1.750 INCHES NOMINAL SINGLE END IN
Applications
  • Applications requiring Steel Overall construction
General Description

The Socket,socket Wrench, cataloged under National Stock Number 5120-01-399-9698, is classified within Federal Supply Class 5120 (No Item Name Available) of the Hand Tools group. The primary manufacturer of record is The Stanley Works Dba Stanley Proto. Government technical data includes 10 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 7 commercial cross-references from 6 manufacturers, enabling identification through both NSN and commercial part number lookups. 11 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5120-01-399-9698
Primary Part Number5556
Item NameSocket,socket Wrench
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerThe Stanley Works Dba Stanley Proto
StatusCANCELLED
Style DesignatorINTERNAL-INTERNAL
Surface TreatmentCHROMIUM OVERALL
Drive Surface Size0.750 INCHES NOMINAL SINGLE END IN
Wrenching Surface Shape12 POINT SINGLE END INTERNAL
Nondefinitive Spec/std Data1 TYPE AND 1 CLASS AND A STYLE
MaterialSTEEL OVERALL
Wrenching Surface Size1.750 INCHES NOMINAL SINGLE END IN
Features ProvidedMANUAL TOOL
Drive End ShapeSQUARE SINGLE END INTERNAL
Specification/standard Data81343-SAE AS954 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 11
5996-00-056-26492269690 INTERCHANGEABLE
Amplifier,magnetic
Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier
6130-00-145-6101374334-1 INTERCHANGEABLE
Power Supply
L3harris Technologies, Inc. Dba Harris Corp Div Antenna Products
4720-00-352-5594 INTERCHANGEABLE
Hose Assembly,nonmetallic
5305-00-582-849115X485 INTERCHANGEABLE
Screw,machine
Napco International Llc Dba Napco International Inc
5950-00-648-5323 INTERCHANGEABLE
Transformer,power
3040-00-671-6325555-6 INTERCHANGEABLE
Gearshaft,spur
Mas Components & Coatings, Llc Dba Mas Components & Coatings Llc
3439-00-803-9500AWSA5.10-80 ER5556 0.047 1LB INTERCHANGEABLE
Electrode,welding
American Welding Society, Inc.
3439-01-013-3236AWSA5.10-69 ER5556 0.125 INTERCHANGEABLE
Electrode,welding
American Welding Society, Inc.
5930-01-279-43635556 INTERCHANGEABLE
Switch,electrical
Talk-a-Phone Co
6515-01-561-4600KLTD205 INTERCHANGEABLE
Airway,supraglottic
King Systems Corporation Dba Foreign Parent Is Ambu A/s, Ballerup, Denmark. Div King Systems a Subsidiary of Ambu Inc S a
Cross-Reference Index
Part NumberManufacturer
5556 The Stanley Works Dba Stanley Proto (USA)
AS954 Society of Automotive Engineers Inc (USA)
1AP56 W.w. Grainger, Inc. Div Government Sales Division (USA)
AS954 Sae International Dba Sae International (USA)
STP 5556G Kipper Tool Company Dba Kipper Management Inc (USA)
AS954 TY1CL1STA General Services Administration Federal Supply Service (USA)
J5556 The Stanley Works Dba Stanley Proto (USA)
Related Parts
5996-00-056-2649INTERCHANGEABLE
AMPLIFIER,MAGNETIC
2269690
6130-00-145-6101INTERCHANGEABLE
POWER SUPPLY
374334-1
4720-00-352-5594INTERCHANGEABLE
HOSE ASSEMBLY,NONMETALLIC
5305-00-582-8491INTERCHANGEABLE
SCREW,MACHINE
15X485
5950-00-648-5323INTERCHANGEABLE
TRANSFORMER,POWER
3040-00-671-6325INTERCHANGEABLE
GEARSHAFT,SPUR
555-6
3439-00-803-9500INTERCHANGEABLE
ELECTRODE,WELDING
AWSA5.10-80 ER5556 0.047 1LB
3439-01-013-3236INTERCHANGEABLE
ELECTRODE,WELDING
AWSA5.10-69 ER5556 0.125
5930-01-279-4363INTERCHANGEABLE
SWITCH,ELECTRICAL
5556
6515-01-561-4600INTERCHANGEABLE
AIRWAY,SUPRAGLOTTIC
KLTD205
5120-01-652-1457INTERCHANGEABLE
SOCKET,SOCKET WRENCH

Frequently Asked Questions

What is NSN 5120-01-399-9698?

NSN 5120-01-399-9698 is a Socket,socket Wrench, manufactured by The Stanley Works Dba Stanley Proto, classified under FSC 5120 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5120-01-399-9698?

NSN 5120-01-399-9698 has 7 cross-referenced part numbers: 5556 (The Stanley Works Dba Stanley Proto), AS954 (Society of Automotive Engineers Inc), 1AP56 (W.w. Grainger, Inc. Div Government Sales Division), AS954 (Sae International Dba Sae International), STP 5556G (Kipper Tool Company Dba Kipper Management Inc) and 2 more.

What NSN replaces 5120-01-399-9698?

There are 11 known substitutes for 5120-01-399-9698: 5996-00-056-2649, 6130-00-145-6101, 4720-00-352-5594 and 8 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 5556?

Key specifications for 5556: Style Designator: INTERNAL-INTERNAL; Surface Treatment: CHROMIUM OVERALL; Drive Surface Size: 0.750 INCHES NOMINAL SINGLE END IN; Wrenching Surface Shape: 12 POINT SINGLE END INTERNAL. 11 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5120-01-399-9698 still in active supply?

NSN 5120-01-399-9698 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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