Screw Adapters | McMaster-Carr

	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

	Material Material

	Gender Gender


Male	Female

	Hex Length Hex Length

	Thread Length Thread Length

	Shape Shape


Hex	Round

Straight

	For Adapting For Adapting

	Hex Size Hex Size

	Pitch Pitch

	Drive Style Drive Style


External Hex	Slotted	Hex

	Thread Fit Thread Fit

	Tensile Strength Tensile Strength

	Hardness Hardness

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

DFARS Specialty Metals
Compliant

	Specifications Met Specifications Met

ASTM

NAS

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	Finish Finish

Black Oxide

Zinc Plated

Yellow-Chromate Plated

Passivated

Nickel Plated

	Thread Type Thread Type

	Pipe Size Pipe Size

	Length Length

	Screw Size Screw Size

3,769 Products

Male-Female 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.

Metric-to-Metric Male-Female Hex Thread Adapters

In addition to joining male- and female-threaded parts, these adapters can increase or decrease metric thread sizes and change the thread pitch.

Slotted-Drive Male-Female Round Thread Adapters

Male-Female Round Universal
Thread Adapters with Through Hole

Connect male- and female-threaded parts of different thread types and sizes, while allowing air, liquids, wire, or other thin materials to pass through.

Inch-to-NPT Male-Female Hex Thread Adapters

Inch-to-NPT Male-Female Hex
Thread Adapters with Through Hole

The through hole allows you to connect float rods to float valves.

Male Thread Adapters

Inch-to-Inch Male Round Thread Adapters

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.

Metric-to-Metric Male Round Thread Adapters

Metric-to-Metric Male Hex Thread Adapters

Twist these adapters onto female metric threads to change pitch or switch thread sizes.

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-Metric Male Round Thread Adapters

Male Round Universal Thread
Adapters with Through Hole

Join two female-threaded parts of various thread types and sizes, while allowing air, liquids, wire, or other thin materials to pass through.

Left-Hand to Right-Hand Male Thread Adapters

Female Thread Adapters

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.

Metric-to-Metric Female Hex Thread Adapters

Increase or decrease metric thread size from one male-threaded part to another. Commonly used to connect two differently sized threaded rods, they have a hex-shaped body, so you can tighten them with 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 Rods and Studs

Steel Wood Screw Threaded Studs

These studs are also known as hanger bolts—use them to hang, mount, and fasten parts to wood structures.

Stainless Steel Wood Screw Threaded Studs

18-8 stainless steel studs have good chemical resistance and may be mildly magnetic. Also known as hanger bolts, use them to hang, mount, and fasten parts to wood structures.

Metric Stainless Steel Wood Screw Threaded Studs

These metric 316 stainless steel studs have excellent resistance to chemicals and salt water. Also known as hanger bolts, use them to hang, mount, and fasten parts to wood structures.

Hex Drive Threaded Rods

A hex drive on one end allows these rods to be turned with a hex key for ease of installation.

Wood-to-Wood Joining Studs

Also known as dowel screws, use these to join two pieces of wood.

Fabricating and Machining

Thread Adapters for Masonry Drill Bits for Drilling Rigs

Adapt a bit for use on a drilling rig with a different thread size.

Adapters for Threaded-Stud Flap Sanding Wheels

Adapt flap wheels with a threaded stud for use on tools that have a threaded spindle.

Threaded Adapters for Pullers

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

Electrical

Thread Adapters for Mini Connectors

Join two connectors that both have internal threads.

Thread Adapters for Harsh
Environment Mini Connectors