PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

TW401Socket,socket Wrench

Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc · NSN 5120-01-335-0788 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-335-0788 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-335-0788. Primary manufacturer part number: TW401.
Features
  • Socket,socket Wrench — FSC 5120
  • Style Designator: INTERNAL-INTERNAL
  • Drive Surface Size: 0.500 INCHES NOMINAL SINGLE END IN
  • Material: STEEL OVERALL
  • Features Provided: MANUAL TOOL
  • Wrenching Surface Size: 1.250 INCHES NOMINAL SINGLE END IN
  • Wrenching Surface Shape: 6 POINT SINGLE END INTERNAL
  • Surface Treatment: CHROMIUM OVERALL
Applications
  • Applications requiring Steel Overall construction
General Description

The Socket,socket Wrench, cataloged under National Stock Number 5120-01-335-0788, is classified within Federal Supply Class 5120 (No Item Name Available) of the Hand Tools group. The primary manufacturer of record is Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc. Government technical data includes 8 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5120-01-335-0788
Primary Part NumberTW401
Item NameSocket,socket Wrench
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerIdsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc
StatusACTIVE
Style DesignatorINTERNAL-INTERNAL
Drive Surface Size0.500 INCHES NOMINAL SINGLE END IN
MaterialSTEEL OVERALL
Features ProvidedMANUAL TOOL
Wrenching Surface Size1.250 INCHES NOMINAL SINGLE END IN
Wrenching Surface Shape6 POINT SINGLE END INTERNAL
Surface TreatmentCHROMIUM OVERALL
Drive End ShapeSQUARE SINGLE END INTERNAL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 1
5120-01-366-8354 INTERCHANGEABLE
Socket,socket Wrench
Cross-Reference Index
Part NumberManufacturer
P40251 Martin-Baker Aircraft Company Limited (GBR)
MBEU59168 Martin-Baker Aircraft Company Limited (GBR)
9593009921 Pilatus Aircraft Ltd (CHE)
TW401 PRIMARY Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc (USA)
Related Parts
5120-01-366-8354INTERCHANGEABLE
SOCKET,SOCKET WRENCH

Frequently Asked Questions

What is NSN 5120-01-335-0788?

NSN 5120-01-335-0788 is a Socket,socket Wrench, manufactured by Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc, classified under FSC 5120 (No Item Name Available). Status: active.

What are the part numbers for NSN 5120-01-335-0788?

NSN 5120-01-335-0788 has 4 cross-referenced part numbers: P40251 (Martin-Baker Aircraft Company Limited), MBEU59168 (Martin-Baker Aircraft Company Limited), 9593009921 (Pilatus Aircraft Ltd), TW401 (Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc).

What NSN replaces 5120-01-335-0788?

There is 1 known substitute for 5120-01-335-0788: 5120-01-366-8354. Verify interchangeability with system specifications before substitution.

What are the specifications of TW401?

Key specifications for TW401: Style Designator: INTERNAL-INTERNAL; Drive Surface Size: 0.500 INCHES NOMINAL SINGLE END IN; Material: STEEL OVERALL; Features Provided: MANUAL TOOL. 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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