PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

FC66ACrowfoot Attachment,socket Wrenc

Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc · NSN 5120-01-335-1148 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-335-1148 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-335-1148. Primary manufacturer part number: FC66A.
Features
  • Crowfoot Attachment,socket Wrenc — FSC 5120
  • Wrenching Surface Shape: OVAL SINGLE END INTERNAL
  • Wrenching Surface Size: 2.062 INCHES NOMINAL SINGLE END IN
  • Drive Surface Size: 0.375 INCHES NOMINAL SINGLE END IN
  • Nondefinitive Spec/std Data: 2 TYPE AND 2 CLASS
  • Material: STEEL OVERALL
  • Style Designator: OPEN END CAMBER
  • Specification/standard Data: 05047-ASME B107.100 CAT 21 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
Applications
  • Applications requiring Steel Overall construction
General Description

The Crowfoot Attachment,socket Wrenc, cataloged under National Stock Number 5120-01-335-1148, 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 9 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 8 commercial cross-references from 5 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5120-01-335-1148
Primary Part NumberFC66A
Item NameCrowfoot Attachment,socket Wrenc
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerIdsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc
StatusACTIVE
Wrenching Surface ShapeOVAL SINGLE END INTERNAL
Wrenching Surface Size2.062 INCHES NOMINAL SINGLE END IN
Drive Surface Size0.375 INCHES NOMINAL SINGLE END IN
Nondefinitive Spec/std Data2 TYPE AND 2 CLASS
MaterialSTEEL OVERALL
Style DesignatorOPEN END CAMBER
Specification/standard Data05047-ASME B107.100 CAT 21 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
Surface TreatmentCHROMIUM OVERALL
Drive End ShapeSQUARE SINGLE END INTERNAL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5120-00-181-6784 INTERCHANGEABLE
Crowfoot Attachment,socket Wrenc
5120-00-236-2261 INTERCHANGEABLE
Crowfoot Attachment,socket Wrenc
5120-00-535-1641 INTERCHANGEABLE
Crowfoot Attachment,socket Wrenc
5120-00-604-5021 INTERCHANGEABLE
Crowfoot Attachment,socket Wrenc
5120-01-302-4387 INTERCHANGEABLE
Crowfoot Attachment Set,socket W
5120-01-335-1091 INTERCHANGEABLE
Crowfoot Attachment,socket Wrenc
5120-01-335-1111 INTERCHANGEABLE
Crowfoot Attachment,socket Wrenc
5120-01-335-1124SCO44 INTERCHANGEABLE
Crowfoot Attachment,socket Wrenc
Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc
5120-01-429-6689 INTERCHANGEABLE
Crowfoot Attachment Set,socket W
5120-01-586-4506 INTERCHANGEABLE
Crowfoot Attachment,socket Wrenc
Cross-Reference Index
Part NumberManufacturer
B107.21 The American Society of Mechanical Engineers (USA)
B107.21 TY2CL2 General Services Administration Federal Supply Service (USA)
B107.100 CAT 21 TY2CL2 General Services Administration Federal Supply Service (USA)
B107.100 The American Society of Mechanical Engineers (USA)
FC66 Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc (USA)
FC66A Snap on Tools (AUS)
5120PL0946646 Jednolity Indeks Materialowy - Uniform Material Index (POL)
FC66A PRIMARY Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc (USA)
Related Parts
5120-00-181-6784INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC
5120-00-236-2261INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC
5120-00-535-1641INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC
5120-00-604-5021INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC
5120-01-302-4387INTERCHANGEABLE
CROWFOOT ATTACHMENT SET,SOCKET W
5120-01-335-1091INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC
5120-01-335-1111INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC
5120-01-335-1124INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC
SCO44
5120-01-429-6689INTERCHANGEABLE
CROWFOOT ATTACHMENT SET,SOCKET W
5120-01-586-4506INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC
5120-01-589-8725INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC
5120-01-603-5295INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC
TMCOM10

Frequently Asked Questions

What is NSN 5120-01-335-1148?

NSN 5120-01-335-1148 is a Crowfoot Attachment,socket Wrenc, 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 5120-01-335-1148?

NSN 5120-01-335-1148 has 8 cross-referenced part numbers: B107.21 (The American Society of Mechanical Engineers), B107.21 TY2CL2 (General Services Administration Federal Supply Service), B107.100 CAT 21 TY2CL2 (General Services Administration Federal Supply Service), B107.100 (The American Society of Mechanical Engineers), FC66 (Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc) and 3 more.

What NSN replaces 5120-01-335-1148?

There are 12 known substitutes for 5120-01-335-1148: 5120-00-181-6784, 5120-00-236-2261, 5120-00-535-1641 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of FC66A?

Key specifications for FC66A: Wrenching Surface Shape: OVAL SINGLE END INTERNAL; Wrenching Surface Size: 2.062 INCHES NOMINAL SINGLE END IN; Drive Surface Size: 0.375 INCHES NOMINAL SINGLE END IN; Nondefinitive Spec/std Data: 2 TYPE AND 2 CLASS. 11 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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