Dix-Lock™ N-Series Interchange Female Head x Male Threaded End Coupler

Dix-Lock™ N-Series Interchange Female Head x Male Threaded End Coupler

Part Number 4NM4
Material Steel
Thread NPTF
Thread Size 1/2"
Maximum OD 1.50" (38.1mm)
Body Size 1/2"
Hex 1-3/8"
Length 1.85" (47.0mm)
Pressure Rating See Product Details
Temperature Range -40°F to +250°F (-40°C to +121°C)
Weight Lb 0.3000


  • Rated pressure for connected Steel Coupler & Steel Plug: 500 PSI (35 bar) Maximum Working and 11,000 PSI (755 bar) Burst
  • Conforms to MIL-C-3486 and A-A-50431A standards


  • Machined components are manufactured using solid bar stock.
  • Nitrile (Buna-N) seals standard
  • Steel componentry is plated using ROHS Compliant Trivalent Chrome.

Available Options

  • Additional seal options available, contact Dixon
  • 316 stainless steel available in some versions upon request, contact Dixon

Compatibility & Interchange Data

  • Bowes Interchange Bayonet Style
  • Interchangeable with Bowes 51000-Series, National Series 'B', MacDonald Quick-Action, Campbell Single-Lock

Safety notes

  • It is important to be safe when installing quick disconnect couplings into a pneumatic circuit. Never install a pneumatic coupling directly into an air tool, use a piece of hose that is at least 18" long, between the tool and the coupling, to prevent damage to the coupling. To protect the operator, safety devices, such as a safety check valve and safety cable should be installed in case there is a hose or coupling failure.

Repair Kits
Part # Description Includes Item # Qty
4N-SKIT Nitrile Pneumatically Energized Seal
F-4N-SKIT FKM Pneumatically Energized Seal

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Stock Availability