PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

B107.21Crowfoot Attachment,socket Wrenc

The American Society of Mechanical Engineers · NSN 5120-00-184-8411 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-00-184-8411 — this item is cataloged by the U.S. Government under National Stock Number 5120-00-184-8411. Primary manufacturer part number: B107.21.
Features
  • Crowfoot Attachment,socket Wrenc — FSC 5120
  • Drive End Shape: SQUARE SINGLE END INTERNAL
  • Drive Surface Size: 0.375 INCHES NOMINAL SINGLE END IN
  • Style Designator: OPEN END CAMBER
  • Specification/standard Data: 05047-ASME B107.21 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
  • Surface Treatment: CHROMIUM OVERALL
  • Wrenching Surface Size: 1.438 INCHES NOMINAL SINGLE END IN
  • Nondefinitive Spec/std Data: 2 TYPE AND 1 CLASS
Applications
  • Applications requiring Steel Overall construction
General Description

The Crowfoot Attachment,socket Wrenc, cataloged under National Stock Number 5120-00-184-8411, is classified within Federal Supply Class 5120 (No Item Name Available) of the Hand Tools group. The primary manufacturer of record is The American Society of Mechanical Engineers. Government technical data includes 10 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 6 commercial cross-references from 4 manufacturers, enabling identification through both NSN and commercial part number lookups. 8 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5120-00-184-8411
Primary Part NumberB107.21
Item NameCrowfoot Attachment,socket Wrenc
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerThe American Society of Mechanical Engineers
StatusACTIVE
Drive End ShapeSQUARE SINGLE END INTERNAL
Drive Surface Size0.375 INCHES NOMINAL SINGLE END IN
Style DesignatorOPEN END CAMBER
Specification/standard Data05047-ASME B107.21 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
Surface TreatmentCHROMIUM OVERALL
Wrenching Surface Size1.438 INCHES NOMINAL SINGLE END IN
Nondefinitive Spec/std Data2 TYPE AND 1 CLASS
Head Thickness0.375 INCHES NOMINAL IN
Wrenching Surface ShapeOVAL SINGLE END INTERNAL
MaterialSTEEL OVERALL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 8
5120-00-184-8383 INTERCHANGEABLE
Crowfoot Attachment,socket Wrenc
5120-00-184-8384 INTERCHANGEABLE
Crowfoot Attachment,socket Wrenc
5120-00-184-8397 INTERCHANGEABLE
Crowfoot Attachment,socket Wrenc
5120-00-184-8398 INTERCHANGEABLE
Crowfoot Attachment,socket Wrenc
5120-00-184-8410 INTERCHANGEABLE
Crowfoot Attachment,socket Wrenc
5120-00-184-8418 INTERCHANGEABLE
Crowfoot Attachment,socket Wrenc
5120-01-335-1102 INTERCHANGEABLE
Crowfoot Attachment,socket Wrenc
5120-01-335-1138 INTERCHANGEABLE
Crowfoot Attachment,socket Wrenc
Cross-Reference Index
Part NumberManufacturer
B107.21 The American Society of Mechanical Engineers (USA)
GGG-C-1507 TY2 General Services Administration Federal Supply Service (USA)
GGG-C-1507 Federal Specifications Promulgated by General Services Administration Washington DC (USA)
B107.21 TY2CL1 General Services Administration Federal Supply Service (USA)
FC46A Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc (USA)
B107.21 TY2CL2STA General Services Administration Federal Supply Service (USA)
Related Parts
5120-00-184-8383INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC
5120-00-184-8384INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC
5120-00-184-8397INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC
5120-00-184-8398INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC
5120-00-184-8410INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC
5120-00-184-8418INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC
5120-01-335-1102INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC
5120-01-335-1138INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC

Frequently Asked Questions

What is NSN 5120-00-184-8411?

NSN 5120-00-184-8411 is a Crowfoot Attachment,socket Wrenc, manufactured by The American Society of Mechanical Engineers, classified under FSC 5120 (No Item Name Available). Status: active.

What are the part numbers for NSN 5120-00-184-8411?

NSN 5120-00-184-8411 has 6 cross-referenced part numbers: B107.21 (The American Society of Mechanical Engineers), GGG-C-1507 TY2 (General Services Administration Federal Supply Service), GGG-C-1507 (Federal Specifications Promulgated by General Services Administration Washington DC), B107.21 TY2CL1 (General Services Administration Federal Supply Service), FC46A (Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc) and 1 more.

What NSN replaces 5120-00-184-8411?

There are 8 known substitutes for 5120-00-184-8411: 5120-00-184-8383, 5120-00-184-8384, 5120-00-184-8397 and 5 more. Verify interchangeability with system specifications before substitution.

What are the specifications of B107.21?

Key specifications for B107.21: Overall Length: 2.626 INCHES NOMINAL IN; Drive End Shape: SQUARE SINGLE END INTERNAL; Drive Surface Size: 0.375 INCHES NOMINAL SINGLE END IN; Style Designator: OPEN END CAMBER. 12 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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