3/8"-24 Adapters | McMaster-Carr

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310 Products

Tube Fittings for Metal Tubing

37° Flared Fittings for Stainless Steel Tubing

Also known as JIC (Joint Industrial Council) fittings, these provide a tight metal-to-metal seal on stainless steel tubing that is flared to 37°.

45° Flared Fittings for Copper and Brass Tubing

No sleeve is required to assemble these fittings, which makes for a faster, more convenient installation compared to 37° flared fittings. They are also known as refrigeration and SAE fittings.

37° Flared Fittings for Copper Tubing

Also known as JIC (Joint Industrial Council) fittings, these connect to tubing that is flared to 37°. They can handle higher pressures than 45° flared fittings.

37° Flared Fittings for Steel Tubing

Also known as JIC (Joint Industrial Council) fittings, these provide a tight metal-to-metal seal on steel tubing that is flared to 37°.

Tight-Space 37° Flared Fittings for Aluminum Tubing

The external hex bolt on these fittings allows for easy installation in cramped spaces. They are also known as banjo-style fittings and JIC (Joint Industrial Council) fittings. They provide a tight seal on tubing that is flared to 37°.

Hose Fittings

Metal Barbed Hose Fittings for Air and Water

Metal hose fittings have better durability than plastic barbed hose fittings.

Threaded Hose Fittings for Compressed Gas

Use these CGA fittings to connect welding hose to pressure regulators and torches.

Nuts for Barbed Hose Fittings for Compressed Gas

Also known as CGA nuts, these are designed for low-pressure welding applications downstream of your pressure regulator. Attach them to barbed hose fittings for compressed gas to make a threaded connection to torches or pressure regulators.

Metal Barbed Hose Fittings
for Chemicals and Petroleum

These metal hose fittings have better durability than plastic barbed hose fittings. They are 316 stainless steel for excellent corrosion and chemical resistance. Slide the barbed end into hose and secure with a clamp.

Couplers for High-Pressure Fill Valves

Thread Adapters

Inch-to-Inch Male-Female Hex Thread Adapters

Change thread sizes or types, such as fine to coarse threads, on parts without changing gender.

Inch-to-Metric Male-Female Hex Thread Adapters

Change inch threads to metric with these adapters, or swap metric threads for inch. An external hex lets you tighten or loosen them with a wrench.

Inch-to-Inch Male Hex Thread Adapters

Need to join two female-threaded parts, such as coupling nuts, with dissimilar inch thread sizes? Attach them to these adapters and tighten the exterior hex nut for a secure connection.

Inch-to-Metric Male Hex Thread Adapters

One side inch, one side metric, and a hex in the middle—these handy fasteners connect two female-threaded parts, such as coupling nuts, adapting from inch threads to metric. Tighten with a standard wrench.

Inch-to-Inch Female Hex Thread Adapters

Connect two differently sized male-threaded parts, such as threaded rods, and tighten with a standard wrench.

Inch-to-Metric Female Hex Thread Adapters

Adapt threaded rods from inch to metric. These adapters connect two male-threaded fasteners, so you can change the gender of a mating part or increase or decrease its thread size. The hex-shaped body fits into the head of a standard wrench.

Left-Hand to Right-Hand
Female Hex Thread Adapters

Often called sleeve nuts, these thread adapters fasten parts with right-hand threads to parts with left-hand threads.

Threaded Inserts for Metal

18-8 Stainless Steel Easy-to-Install
Thread-Locking Inserts

Made of 18-8 stainless steel, these inserts have better corrosion resistance than black-phosphate steel.

Black-Phosphate Steel Easy-to-Install
Thread-Locking Inserts

A black-phosphate finish provides mild corrosion resistance.

Easy-to-Install Thread-Locking Insert Assortments

These assortments include various sizes of thread-locking inserts.

18-8 Stainless Steel Key-Locking Inserts

Made of 18-8 stainless steel, these inserts have good corrosion resistance.

Mil. Spec. Stainless Steel Key-Locking Inserts

These inserts are made to stringent military specifications.

Black-Phosphate Steel Key-Locking Inserts

A black-phosphate finish provides mild corrosion resistance.

Mil. Spec. Alloy Steel Key-Locking Inserts

The strongest key-locking inserts we offer, these inserts are made to stringent military specifications.

Key-Locking Insert Assortments with Installation Tool

Screw-Locking Key-Locking Inserts

Forming the strongest hold of any of our threaded inserts, these inserts have a distorted internal thread to lock screws into place and keys that drive into surrounding material to prevent slipping and rotating.

Key-Locking Inserts with Installation Tool

These inserts come with an installation tool. Drive the keys into the surrounding material for a more secure hold than thread-locking inserts.

Nuts

Low-Profile Narrow-Base Weld Nuts with Projections

Projections on the base concentrate the weld and provide room for heat to dissipate.

Stainless Steel Offset-Barrel Narrow-Base Weld Nuts

Weld these nuts to stainless steel surfaces.

Steel Offset-Barrel Narrow-Base Weld Nuts

Weld these nuts to uncoated steel surfaces.

Steel Hex Weld Nuts

Weld these nuts to flat and uneven uncoated steel surfaces for a strong permanent hold.

Square Weld Nuts

Square weld nuts have more weld points than hex weld nuts for a stronger hold. Use them on flat surfaces.

Aligning Weld Nuts

Threads float inside the retainer so you can install a bolt at a slight angle to align with off center parts.

Tube-End Weld Nuts

About half the strength of medium-strength steel coupling nuts, these metric nuts are for light duty fastening applications.

Left-Hand Threaded Tube-End Weld Nuts

Use these tube-end weld nuts with left-hand threaded fasteners.

Forcing Screws and Accessories for Pullers

Threaded Adapters for Pullers

Use adapters on the ends of forcing screws and face-grip puller legs when pulling shafts, bearing caps, and pinions.

Forcing Screws for Pullers

Make your old puller work like new by replacing worn forcing screws.

Ridgid Dies for Cutting Screw Threads

Use these dies with Ridgid pipe and conduit threader die heads on Ridgid pipe and conduit threaders.

Pressure Test Fittings

Check pressure without permanently installing a gauge.

Bayonet-Style Thermocouple Adapters

Attach thermocouple probes with a bayonet connection to a threaded connection.

Create-Your-Own Push/Pull Control Cables

Pair these cables with a knob or lever to operate valves, throttle controls, and HVAC damper controls from a distance. They're flexible for weaving around obstructions.