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10N40 - ESAB Fuel Gas Hose Nut, B-Size 5/8-18 LH

Packaging: pack of 1
$23.32/EA $14.07/pack of 1 only $14.07/EASave 40%

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SKU: ESB10N40 Categories: ,

OVERVIEW

Technical Overview of the ESAB 10N40 Hose Nut

The ESAB 10N40 is a precision-engineered brass hose nut designed specifically for industrial oxy-fuel welding and cutting applications. This component is critical for maintaining the integrity and safety of gas distribution systems. It features a standard B-Size 5/8"-18 thread with a Left-Hand (LH) orientation. In the welding industry, the distinction between thread directions is a primary safety control; left-hand threads are exclusively reserved for fuel gases (such as Acetylene, Propane, Propylene, and Natural Gas) to physically prevent the accidental connection of a fuel line to an oxygen or inert gas outlet, which use right-hand threads.

Manufactured from high-grade brass, this nut offers excellent machinability and resistance to corrosion and wear, ensuring a long service life even in harsh workshop environments. The nut is designed to mate with standard hose nipples (barbs) and secure them to regulators, torch handles, or machine inlets. The external hex geometry allows for easy tightening with a standard wrench, while the identifying groove or notch cut into the hex vertices is the universal visual indicator for left-hand threads, allowing technicians to verify safety compliance at a glance.

This fitting is an essential component for MRO (Maintenance, Repair, and Operations) inventories, allowing for the immediate repair of damaged hose terminations or the fabrication of custom hose assemblies. It adheres to Compressed Gas Association (CGA) standards for B-size connections, ensuring compatibility across a wide range of equipment brands and models.

Key Technical Specifications

  • Thread Specification: 5/8"-18 UNF
  • Thread Direction: Left Hand (Counter-clockwise to tighten)
  • Material: Solid Brass
  • Standard: CGA "B" Size
  • Marking: Notched hex for LH identification
Additional Information
Packaging Description:1 Per Ea, pack of 1
Thread Size:5/8"-18
Thread Direction:Left Hand (LH)
Material:Brass
Gas Service:Acetylene, Fuel Gas, Propane
Connection Type:B-Size
Product Type:Hose Nut
----- new values below ----
Packaging Description:1 Per Ea
Product Type:Hose Nut
Thread Size:5/8"-18
Thread Direction:Left Hand (LH)
Material:Brass
Gas Service:Fuel Gas, Acetylene, Propane
Connection Type:B-Size

INCLUDED

  • 1x Brass Hose Nut (5/8"-18 LH)

APPLICATIONS

  • Repairing damaged ends on Acetylene or Propane welding hoses.
  • Assembling custom-length oxy-fuel hoses for specific workshop layouts.
  • Replacing stripped or rounded nuts on existing equipment.
  • Connecting fuel gas hoses to regulators, flowmeters, and torch handles.
  • General maintenance of oxy-fuel cutting and welding outfits.

FAQ

LH stands for 'Left Hand'. This indicates the direction of the threads. Unlike standard screws, you turn this nut counter-clockwise to tighten it. This is a safety standard for fuel gases to prevent cross-connection with oxygen lines.

No. Oxygen fittings use Right-Hand (RH) threads. This nut is specifically for fuel gases (Acetylene, Propane, etc.) and will not screw onto an oxygen fitting.

B-Size refers to the standard connection size for most industrial welding equipment. It corresponds to a 5/8"-18 thread. There are smaller 'A-Size' fittings (3/8"-24), but B-Size is the most common for standard regulators and torches.

No, this SKU is typically for the brass nut only. The hose nipple (the part that goes inside the hose) must be purchased separately or salvaged if in good condition.

Industry standards require Left-Hand nuts to have a notch or groove cut into the middle of the hex vertices. If you see that groove, it is a fuel gas nut.

It is machined from solid brass, which is the standard material for welding gas fittings due to its durability, non-sparking properties, and corrosion resistance.

Yes, as long as the torch or regulator uses standard B-Size connections (which most industrial models do), this nut is compatible regardless of the brand.

Generally, no. Welding hose connections rely on the metal-to-metal seat between the nipple (inside the nut) and the regulator/torch outlet. The nut provides the compression force. Teflon tape is usually not used on the threads of these swivel connections.

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