PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

40128Socket,socket Wrench

S K Hand Tool Corp · NSN 5120-01-430-2971 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-430-2971 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-430-2971. Primary manufacturer part number: 40128.
Features
  • Socket,socket Wrench — FSC 5120
  • Specification/standard Data: 81343-SAE AS954 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
  • Wrenching Surface Shape: 12 POINT SINGLE END INTERNAL
  • Nondefinitive Spec/std Data: 1 TYPE AND 1 CLASS AND A STYLE
  • Surface Treatment: CHROMIUM OVERALL
  • Wrenching Surface Size: 0.875 INCHES NOMINAL SINGLE END IN
  • Material: STEEL OVERALL
  • Drive End Shape: SQUARE SINGLE END INTERNAL
Applications
  • Applications requiring Steel Overall construction
General Description

The Socket,socket Wrench, cataloged under National Stock Number 5120-01-430-2971, is classified within Federal Supply Class 5120 (No Item Name Available) of the Hand Tools group. The primary manufacturer of record is S K Hand Tool Corp. Government technical data includes 10 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 6 commercial cross-references from 5 manufacturers, enabling identification through both NSN and commercial part number lookups. 8 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5120-01-430-2971
Primary Part Number40128
Item NameSocket,socket Wrench
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerS K Hand Tool Corp
StatusCANCELLED
Specification/standard Data81343-SAE AS954 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
Wrenching Surface Shape12 POINT SINGLE END INTERNAL
Nondefinitive Spec/std Data1 TYPE AND 1 CLASS AND A STYLE
Surface TreatmentCHROMIUM OVERALL
Wrenching Surface Size0.875 INCHES NOMINAL SINGLE END IN
MaterialSTEEL OVERALL
Drive End ShapeSQUARE SINGLE END INTERNAL
Style DesignatorINTERNAL-INTERNAL
Features ProvidedMANUAL TOOL
Drive Surface Size0.500 INCHES NOMINAL SINGLE END IN
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 8
3455-00-194-051010070 INTERCHANGEABLE
Cutter,milling,plain
Niagara Cutter Inc
5360-00-291-538240128 INTERCHANGEABLE
Spring
Sullair Corp
5950-01-149-7020 INTERCHANGEABLE
Transformer,power
2910-01-276-148440128E INTERCHANGEABLE
Pump,fuel,electrical
Purolator Products Co Div Motor Components, Llc
2520-01-346-199440128 INTERCHANGEABLE
Power Takeoff,transmission
Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic
3120-01-373-148540128 INTERCHANGEABLE
Bearing,washer,thrust
Paccar Winch Inc Dba Paccar Winch Division
8465-01-565-403040128 INTERCHANGEABLE
Vest,hydration,tactical
Camelbak Products, Llc Dba Camelbak
4730-01-678-056940128 INTERCHANGEABLE
Plug,pipe
Fastenal Company Dba Fastenal Co
Cross-Reference Index
Part NumberManufacturer
40128 S K Hand Tool Corp (USA)
AS954 Sae International Dba Sae International (USA)
B107.1 The American Society of Mechanical Engineers (USA)
AS954 TY1CL1STA General Services Administration Federal Supply Service (USA)
B107.1 TY1CL1 General Services Administration Federal Supply Service (USA)
AS954 Society of Automotive Engineers Inc (USA)
Related Parts
3455-00-194-0510INTERCHANGEABLE
CUTTER,MILLING,PLAIN
10070
5360-00-291-5382INTERCHANGEABLE
SPRING
40128
5950-01-149-7020INTERCHANGEABLE
TRANSFORMER,POWER
2910-01-276-1484INTERCHANGEABLE
PUMP,FUEL,ELECTRICAL
40128E
2520-01-346-1994INTERCHANGEABLE
POWER TAKEOFF,TRANSMISSION
40128
3120-01-373-1485INTERCHANGEABLE
BEARING,WASHER,THRUST
40128
8465-01-565-4030INTERCHANGEABLE
VEST,HYDRATION,TACTICAL
40128
4730-01-678-0569INTERCHANGEABLE
PLUG,PIPE
40128

Frequently Asked Questions

What is NSN 5120-01-430-2971?

NSN 5120-01-430-2971 is a Socket,socket Wrench, manufactured by S K Hand Tool Corp, classified under FSC 5120 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5120-01-430-2971?

NSN 5120-01-430-2971 has 6 cross-referenced part numbers: 40128 (S K Hand Tool Corp), AS954 (Sae International Dba Sae International), B107.1 (The American Society of Mechanical Engineers), AS954 TY1CL1STA (General Services Administration Federal Supply Service), B107.1 TY1CL1 (General Services Administration Federal Supply Service) and 1 more.

What NSN replaces 5120-01-430-2971?

There are 8 known substitutes for 5120-01-430-2971: 3455-00-194-0510, 5360-00-291-5382, 5950-01-149-7020 and 5 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 40128?

Key specifications for 40128: Specification/standard Data: 81343-SAE AS954 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD; Wrenching Surface Shape: 12 POINT SINGLE END INTERNAL; Nondefinitive Spec/std Data: 1 TYPE AND 1 CLASS AND A STYLE; Surface Treatment: CHROMIUM OVERALL. 12 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5120-01-430-2971 still in active supply?

NSN 5120-01-430-2971 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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