PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

20557Crowfoot Attachment,socket Wrenc

Easco Hand Tools Inc · NSN 5120-01-430-8146 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-430-8146 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-430-8146. Primary manufacturer part number: 20557.
Features
  • Crowfoot Attachment,socket Wrenc — FSC 5120
  • Style Designator: OPEN END
  • Material: STEEL OVERALL
  • Drive End Shape: SQUARE SINGLE END INTERNAL
  • Wrenching Surface Size: 0.750 INCHES NOMINAL SINGLE END IN
  • Wrenching Surface Shape: OVAL SINGLE END INTERNAL
  • Drive Surface Size: 0.375 INCHES NOMINAL SINGLE END IN
  • Surface Treatment: CHROMIUM OVERALL
Applications
  • Applications requiring Steel Overall construction
General Description

The Crowfoot Attachment,socket Wrenc, cataloged under National Stock Number 5120-01-430-8146, is classified within Federal Supply Class 5120 (No Item Name Available) of the Hand Tools group. The primary manufacturer of record is Easco Hand Tools Inc. 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. 7 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5120-01-430-8146
Primary Part Number20557
Item NameCrowfoot Attachment,socket Wrenc
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerEasco Hand Tools Inc
StatusACTIVE
Style DesignatorOPEN END
MaterialSTEEL OVERALL
Drive End ShapeSQUARE SINGLE END INTERNAL
Wrenching Surface Size0.750 INCHES NOMINAL SINGLE END IN
Wrenching Surface ShapeOVAL SINGLE END INTERNAL
Drive Surface Size0.375 INCHES NOMINAL SINGLE END IN
Surface TreatmentCHROMIUM OVERALL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 7
4720-00-035-891920557 INTERCHANGEABLE
Hose,preformed
Gates Corporation
6130-00-235-099220557 INTERCHANGEABLE
Vibrator,self-Rectifying
Naval Ship Systems Command
5930-00-302-1125C2001-501 INTERCHANGEABLE
Switch,toggle
Calculagraph Company Dba Control Products, Inc.
1015-01-229-544120557 INTERCHANGEABLE
Retainer,valve Head
Real-Time Laboratories, Llc
4130-01-327-940020557 INTERCHANGEABLE
Filter-Drier,refrigerant
Schneider Metal Mfg Co Inc Ross Temp Div
4810-01-378-883920557 INTERCHANGEABLE
Retainer,disk,valve
Triumph Actuation Systems - Valencia, Inc. Dba Triumph Actuation Systems - Valencia Inc Div Triumph Actuation Systems-Val
4720-01-695-002220557 INTERCHANGEABLE
Hose Assembly,nonmetallic
Lockheed Martin Corporation
Cross-Reference Index
Part NumberManufacturer
20557 Easco Hand Tools Inc (USA)
20557 Apex Tool Group, Llc Dba Nicholson (USA)
20557 Easco Hand Tools Inc Dba Danaher Tool Group Div Danaher Tool Group Easco Hand Tools Inc. (USA)
Related Parts
4720-00-035-8919INTERCHANGEABLE
HOSE,PREFORMED
20557
6130-00-235-0992INTERCHANGEABLE
VIBRATOR,SELF-RECTIFYING
20557
5930-00-302-1125INTERCHANGEABLE
SWITCH,TOGGLE
C2001-501
1015-01-229-5441INTERCHANGEABLE
RETAINER,VALVE HEAD
20557
4130-01-327-9400INTERCHANGEABLE
FILTER-DRIER,REFRIGERANT
20557
4810-01-378-8839INTERCHANGEABLE
RETAINER,DISK,VALVE
20557
4720-01-695-0022INTERCHANGEABLE
HOSE ASSEMBLY,NONMETALLIC
20557

Frequently Asked Questions

What is NSN 5120-01-430-8146?

NSN 5120-01-430-8146 is a Crowfoot Attachment,socket Wrenc, manufactured by Easco Hand Tools Inc, classified under FSC 5120 (No Item Name Available). Status: active.

What are the part numbers for NSN 5120-01-430-8146?

NSN 5120-01-430-8146 has 3 cross-referenced part numbers: 20557 (Easco Hand Tools Inc), 20557 (Apex Tool Group, Llc Dba Nicholson), 20557 (Easco Hand Tools Inc Dba Danaher Tool Group Div Danaher Tool Group Easco Hand Tools Inc.).

What NSN replaces 5120-01-430-8146?

There are 7 known substitutes for 5120-01-430-8146: 4720-00-035-8919, 6130-00-235-0992, 5930-00-302-1125 and 4 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 20557?

Key specifications for 20557: Style Designator: OPEN END; Material: STEEL OVERALL; Drive End Shape: SQUARE SINGLE END INTERNAL; Wrenching Surface Size: 0.750 INCHES NOMINAL SINGLE END IN. 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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