PartsTable TECHNICAL DATA SHEET
OCTOBER 2026Technical Data Sheet

FC42ACrowfoot Attachment,socket Wrenc

Jan Hermanek · NSN 5120-01-335-1136 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-335-1136 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-335-1136. Primary manufacturer part number: FC42A.
Features
  • Crowfoot Attachment,socket Wrenc — FSC 5120
  • Wrenching Surface Size: 1.312 INCHES NOMINAL SINGLE END IN
  • Wrenching Surface Shape: OVAL SINGLE END INTERNAL
  • Specification/standard Data: 05047-ASME B107.100 CAT 21 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
  • Drive Surface Size: 0.375 INCHES NOMINAL SINGLE END IN
  • Material: STEEL OVERALL
  • Nondefinitive Spec/std Data: 2 TYPE AND 1 CLASS
  • Surface Treatment: CHROMIUM OVERALL
Applications
  • Applications requiring Steel Overall construction
General Description

The Crowfoot Attachment,socket Wrenc, cataloged under National Stock Number 5120-01-335-1136, is classified within Federal Supply Class 5120 (No Item Name Available) of the Hand Tools group. The primary manufacturer of record is Jan Hermanek. Government technical data includes 9 verified specifications, sourced from the Federal Logistics Information System. This item has 11 commercial cross-references from 8 manufacturers, enabling identification through both NSN and commercial part number lookups. 2 verified substitutes exist in the government interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5120-01-335-1136
Primary Part NumberFC42A
Item NameCrowfoot Attachment,socket Wrenc
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerJan Hermanek
StatusACTIVE
Wrenching Surface Size1.312 INCHES NOMINAL SINGLE END IN
Wrenching Surface ShapeOVAL SINGLE END INTERNAL
Specification/standard Data05047-ASME B107.100 CAT 21 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
Drive Surface Size0.375 INCHES NOMINAL SINGLE END IN
MaterialSTEEL OVERALL
Nondefinitive Spec/std Data2 TYPE AND 1 CLASS
Surface TreatmentCHROMIUM OVERALL
Drive End ShapeSQUARE SINGLE END INTERNAL
Style DesignatorOPEN END CAMBER
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
⇄ Verified Substitutes 2
5120-00-184-8409 INTERCHANGEABLE
Crowfoot Attachment,socket Wrenc
2920-00-257-1363 INTERCHANGEABLE
Coil,ignition
Cross-Reference Index
Part NumberManufacturer
FC42A Jan Hermanek (CZE)
B107.100 The American Society of Mechanical Engineers (USA)
B107.21 TY2CL1 General Services Administration Federal Supply Service (USA)
4492861351 Lemvigh-Muller A/s (DNK)
B107.21 The American Society of Mechanical Engineers (USA)
FC42A Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc (USA)
B107.100 CAT 21 TY2CL1 General Services Administration Federal Supply Service (USA)
5120PL1012230 Jednolity Indeks Materialowy - Uniform Material Index (POL)
FC42A Snap-on Tools (australia) Pty Ltd (AUS)
H24799 Mbda Uk Ltd (GBR)
FC42 Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc (USA)
Related Parts
5120-00-184-8409INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC
2920-00-257-1363INTERCHANGEABLE
COIL,IGNITION

Frequently Asked Questions

What is NSN 5120-01-335-1136?

NSN 5120-01-335-1136 is a Crowfoot Attachment,socket Wrenc, manufactured by Jan Hermanek, classified under FSC 5120 (No Item Name Available). Status: active.

What are the part numbers for NSN 5120-01-335-1136?

NSN 5120-01-335-1136 has 11 cross-referenced part numbers: FC42A (Jan Hermanek), B107.100 (The American Society of Mechanical Engineers), B107.21 TY2CL1 (General Services Administration Federal Supply Service), 4492861351 (Lemvigh-Muller A/s), B107.21 (The American Society of Mechanical Engineers) and 6 more.

What NSN replaces 5120-01-335-1136?

There are 2 known substitutes for 5120-01-335-1136: 5120-00-184-8409, 2920-00-257-1363. Verify interchangeability with system specifications before substitution.

What are the specifications of FC42A?

Key specifications for FC42A: Wrenching Surface Size: 1.312 INCHES NOMINAL SINGLE END IN; Wrenching Surface Shape: OVAL SINGLE END INTERNAL; Specification/standard Data: 05047-ASME B107.100 CAT 21 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD; Drive Surface Size: 0.375 INCHES NOMINAL SINGLE END IN. 11 total characteristics are documented in the Federal Logistics Information System.

✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com