Air Fittings & Couplers

40+ products

Expected delivery: Tue, Nov 17

Air fittings and quick couplers connect hose, tools and equipment to shop air. This subcategory includes quick couplers and plugs in industrial (M style), automotive (T style) and A style profiles, high-flow couplers, push-to-connect fittings for nylon and polyurethane tubing, brass NPT adapters, hose barbs, manifolds, swivels and ball valves sized for air lines.

What to check before you order

  • Coupler profile. Plugs and couplers of different profiles look alike but will not lock together. Match the profile used on your existing tools and hoses.
  • Body size and thread. Most hand tool couplers use a 1/4 in. body. The thread on the end, male or female NPT, is listed separately, such as 1/4 in. or 3/8 in.
  • Push-to-connect tube size. These fittings are sized by tubing outside diameter, in inch or metric sizes. Inch and metric tubes are not interchangeable.
  • Pressure rating and material. Brass and plated steel are common. Stainless is used for washdown or corrosive areas. Stay within the fitting's pressure rating.

Air hose and reels are under air hose and reels, regulators are under regulators, gauges and cylinders, and the full category is hydraulics and pneumatics. Seal NPT threads with products from sealants and caulk.

Buying guide: NPT pipe threads explained: sizes and sealing

Common questions

Why won't my air hose plug fit my coupler?

The plug and coupler are probably different profiles, such as industrial and automotive. Replace one side so both match, and standardize on one profile across the shop.

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