PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

20555Crowfoot Attachment,socket Wrenc

Apex Tool Group, Llc Dba Nicholson · NSN 5120-01-430-8139 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-430-8139 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-430-8139. Primary manufacturer part number: 20555.
Features
  • Crowfoot Attachment,socket Wrenc — FSC 5120
  • Surface Treatment: CHROMIUM OVERALL
  • Material: STEEL OVERALL
  • Wrenching Surface Shape: OVAL SINGLE END INTERNAL
  • Drive End Shape: SQUARE SINGLE END INTERNAL
  • Drive Surface Size: 0.375 INCHES NOMINAL SINGLE END IN
  • Wrenching Surface Size: 0.625 INCHES NOMINAL SINGLE END IN
  • Style Designator: OPEN END
Applications
  • Applications requiring Steel Overall construction
General Description

The Crowfoot Attachment,socket Wrenc, cataloged under National Stock Number 5120-01-430-8139, is classified within Federal Supply Class 5120 (No Item Name Available) of the Hand Tools group. The primary manufacturer of record is Apex Tool Group, Llc Dba Nicholson. Government technical data includes 7 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. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5120-01-430-8139
Primary Part Number20555
Item NameCrowfoot Attachment,socket Wrenc
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerApex Tool Group, Llc Dba Nicholson
StatusACTIVE
Surface TreatmentCHROMIUM OVERALL
MaterialSTEEL OVERALL
Wrenching Surface ShapeOVAL SINGLE END INTERNAL
Drive End ShapeSQUARE SINGLE END INTERNAL
Drive Surface Size0.375 INCHES NOMINAL SINGLE END IN
Wrenching Surface Size0.625 INCHES NOMINAL SINGLE END IN
Style DesignatorOPEN END
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 4
6505-00-682-7624205-55 INTERCHANGEABLE
Lubricant,surgical
Fougera Pharmaceuticals Inc. Dba Pharmaderm Div Fougera/savage Labs/pharmaderm
5930-00-991-45292055-3 INTERCHANGEABLE
Switch,rotary
Janco Corporation Dba Janco Corp Div Mason Controls
6850-01-357-999192274A INTERCHANGEABLE
Toner,indirect Electrostatic Pro
Hewlett-Packard Company Dba HP
4810-01-380-804420555 INTERCHANGEABLE
Sleeve and Slide,directional Con
Triumph Actuation Systems - Valencia, Inc. Dba Triumph Actuation Systems - Valencia Inc Div Triumph Actuation Systems-Val
Cross-Reference Index
Part NumberManufacturer
20555 Apex Tool Group, Llc Dba Nicholson (USA)
20555 Easco Hand Tools Inc Dba Danaher Tool Group Div Danaher Tool Group Easco Hand Tools Inc. (USA)
20555 Easco Hand Tools Inc (USA)
Related Parts
6505-00-682-7624INTERCHANGEABLE
LUBRICANT,SURGICAL
205-55
5930-00-991-4529INTERCHANGEABLE
SWITCH,ROTARY
2055-3
6850-01-357-9991INTERCHANGEABLE
TONER,INDIRECT ELECTROSTATIC PRO
92274A
4810-01-380-8044INTERCHANGEABLE
SLEEVE AND SLIDE,DIRECTIONAL CON
20555

Frequently Asked Questions

What is NSN 5120-01-430-8139?

NSN 5120-01-430-8139 is a Crowfoot Attachment,socket Wrenc, manufactured by Apex Tool Group, Llc Dba Nicholson, classified under FSC 5120 (No Item Name Available). Status: active.

What are the part numbers for NSN 5120-01-430-8139?

NSN 5120-01-430-8139 has 3 cross-referenced part numbers: 20555 (Apex Tool Group, Llc Dba Nicholson), 20555 (Easco Hand Tools Inc Dba Danaher Tool Group Div Danaher Tool Group Easco Hand Tools Inc.), 20555 (Easco Hand Tools Inc).

What NSN replaces 5120-01-430-8139?

There are 4 known substitutes for 5120-01-430-8139: 6505-00-682-7624, 5930-00-991-4529, 6850-01-357-9991 and 1 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 20555?

Key specifications for 20555: Surface Treatment: CHROMIUM OVERALL; Material: STEEL OVERALL; Wrenching Surface Shape: OVAL SINGLE END INTERNAL; Drive End Shape: SQUARE SINGLE END INTERNAL. 8 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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