PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

J4912HFLCrowfoot Attachment,socket Wrenc

The Stanley Works Dba Stanley Proto · NSN 5120-01-335-1133 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-335-1133 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-335-1133. Primary manufacturer part number: J4912HFL.
Features
  • Crowfoot Attachment,socket Wrenc — FSC 5120
  • Nondefinitive Spec/std Data: 1 TYPE AND 1 CLASS
  • Specification/standard Data: 05047-ASME B107.100 CAT 21 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
  • Style Designator: FLARE NUT
  • Surface Treatment: CHROMIUM OVERALL
  • Wrenching Surface Size: 0.375 INCHES NOMINAL SINGLE END IN
  • Material: STEEL OVERALL
  • Drive Surface Size: 0.375 INCHES NOMINAL SINGLE END IN
Applications
  • Applications requiring Steel Overall construction
General Description

The Crowfoot Attachment,socket Wrenc, cataloged under National Stock Number 5120-01-335-1133, is classified within Federal Supply Class 5120 (No Item Name Available) of the Hand Tools group. The primary manufacturer of record is The Stanley Works Dba Stanley Proto. Government technical data includes 9 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 7 commercial cross-references from 5 manufacturers, enabling identification through both NSN and commercial part number lookups. 11 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5120-01-335-1133
Primary Part NumberJ4912HFL
Item NameCrowfoot Attachment,socket Wrenc
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerThe Stanley Works Dba Stanley Proto
StatusCANCELLED
Nondefinitive Spec/std Data1 TYPE AND 1 CLASS
Specification/standard Data05047-ASME B107.100 CAT 21 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
Style DesignatorFLARE NUT
Surface TreatmentCHROMIUM OVERALL
Wrenching Surface Size0.375 INCHES NOMINAL SINGLE END IN
MaterialSTEEL OVERALL
Drive Surface Size0.375 INCHES NOMINAL SINGLE END IN
Wrenching Surface Shape6 POINT SINGLE END INTERNAL
Drive End ShapeSQUARE SINGLE END INTERNAL
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 11
5120-01-007-8286FRS AN850811B INTERCHANGEABLE
Crowfoot Attachment,socket Wrenc
Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc
5120-01-335-1157J4914HFL INTERCHANGEABLE
Crowfoot Attachment,socket Wrenc
The Stanley Works Dba Stanley Proto
5120-01-335-1158J4916HFL INTERCHANGEABLE
Crowfoot Attachment,socket Wrenc
The Stanley Works Dba Stanley Proto
5120-01-335-1159J4918HFL INTERCHANGEABLE
Crowfoot Attachment,socket Wrenc
The Stanley Works Dba Stanley Proto
5120-01-335-1161J4922HFL INTERCHANGEABLE
Crowfoot Attachment,socket Wrenc
The Stanley Works Dba Stanley Proto
5120-01-335-1164 INTERCHANGEABLE
Crowfoot Attachment,socket Wrenc
5120-01-355-1681J4909MHFL INTERCHANGEABLE
Crowfoot Attachment,socket Wrenc
The Stanley Works Dba Stanley Proto
5120-01-355-1690 INTERCHANGEABLE
Crowfoot Attachment,socket Wrenc
5120-01-428-4966 INTERCHANGEABLE
Crowfoot Attachment,socket Wrenc
5120-01-428-8201GAN8508-31B INTERCHANGEABLE
Crowfoot Attachment,socket Wrenc
Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc
Cross-Reference Index
Part NumberManufacturer
B107.21 The American Society of Mechanical Engineers (USA)
B107.100 The American Society of Mechanical Engineers (USA)
FRH120S Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc (USA)
B107.100 CAT 21 TY1CL1 General Services Administration Federal Supply Service (USA)
B107.21 TY1CL2 General Services Administration Federal Supply Service (USA)
FRH120S Snap on Uk Holdings Ltd T/a Snap on Tools (GBR)
J4912HFL PRIMARY The Stanley Works Dba Stanley Proto (USA)
Related Parts
5120-01-007-8286INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC
FRS AN850811B
5120-01-335-1157INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC
J4914HFL
5120-01-335-1158INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC
J4916HFL
5120-01-335-1159INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC
J4918HFL
5120-01-335-1161INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC
J4922HFL
5120-01-335-1164INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC
5120-01-355-1681INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC
J4909MHFL
5120-01-355-1690INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC
5120-01-428-4966INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC
5120-01-428-8201INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC
GAN8508-31B
5120-01-727-6152INTERCHANGEABLE
CROWFOOT ATTACHMENT SET,SOCKET W
34863

Frequently Asked Questions

What is NSN 5120-01-335-1133?

NSN 5120-01-335-1133 is a Crowfoot Attachment,socket Wrenc, manufactured by The Stanley Works Dba Stanley Proto, classified under FSC 5120 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5120-01-335-1133?

NSN 5120-01-335-1133 has 7 cross-referenced part numbers: B107.21 (The American Society of Mechanical Engineers), B107.100 (The American Society of Mechanical Engineers), FRH120S (Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc), B107.100 CAT 21 TY1CL1 (General Services Administration Federal Supply Service), B107.21 TY1CL2 (General Services Administration Federal Supply Service) and 2 more.

What NSN replaces 5120-01-335-1133?

There are 11 known substitutes for 5120-01-335-1133: 5120-01-007-8286, 5120-01-335-1157, 5120-01-335-1158 and 8 more. Verify interchangeability with system specifications before substitution.

What are the specifications of J4912HFL?

Key specifications for J4912HFL: Nondefinitive Spec/std Data: 1 TYPE AND 1 CLASS; Specification/standard Data: 05047-ASME B107.100 CAT 21 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD; Style Designator: FLARE NUT; Surface Treatment: CHROMIUM OVERALL. 10 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5120-01-335-1133 still in active supply?

NSN 5120-01-335-1133 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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