Dual-Lock™ P-Series Thor Interchange Male Thread Coupler

Dual-Lock™ P-Series Thor Interchange Male Thread Coupler

Part Number 4PM4
Material Steel
Thread NPTF
Thread Size 1/2"
Maximum OD 1.55" (39.4mm)
Body Size 1/2"
Length 2.94" (74.7mm)
Wrench Flat 7/8"
Maximum Operating Pressure 300 PSI (20 bar)
Burst Pressure 2600 PSI (180 bar)
Temperature Range -40°F to +250°F (-40°C to +121°C)
Weight Lb 0.4900


  • Zinc Cast sleeve
  • Machined components are manufactured using solid bar stock.
  • Nitrile (Buna-N) seals are standard
  • Stainless steel retaining ring and spring maximize corrosion resistance and extend service life on the 1 piece sleeve. 2-Piece Sleeve has a phosphor bronze spring.
  • Steel componentry is plated using ROHS Compliant Trivalent Chrome.

Compatibility & Interchange Data

  • Thor Finger-Lock Interchange
  • Interchanges with National A type, Campbell Double-Lock and Thor PHC series couplings

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.
  • WARNING: Cancer and Reproductive Harm- www.P65Warnings.ca.gov

Repair Kits
Part # Description Includes Item # Qty
4P-SKIT Nitrile Sealing Gasket
F-4P-SKIT FKM Sealing Gasket

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