Double-End Bolts | McMaster-Carr

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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 Hex Thread Adapters

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

Left-Hand to Right-Hand Male Thread Adapters

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.

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.

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.

Threaded on Both Ends Studs

Known as setup studs, these studs withstand sideways forces better than fully threaded studs because they have a strong unthreaded middle.

Metric Threaded on Both Ends Studs

Also known as setup studs, these studs withstand sideways forces better than fully threaded studs because they have an unthreaded middle that is stronger than the treaded ends.

Vibration-Resistant Threaded on Both Ends Studs

Also known as tap-end, fixture, and setup studs, these studs have Class 5 friction-fit threads on one end to resist loosening and Class 2A standard threads on the other end for attaching a nut.

Metric Vibration-Resistant
Threaded on Both Ends Studs

Also known as tap-end, fixture, and setup studs, these studs have Class SK6 friction-fit threads on one end to resist loosening and Class 6g standard threads on the other end for attaching a nut.

Threaded on Both Ends Alloy Steel Shoulder Studs

The shoulder’s diameter is slightly smaller than listed, so these studs fit most machinery and equipment.

Wood Screw Threaded Studs

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.

Steel Wood Screw Threaded Studs

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

Hex Drive Wood Screw Threaded Studs

Turn these studs with a hex key for ease of installation.

Hollow Threaded Studs

A hollow center allows these studs to be used as an axle, a vent, or a passageway for wiring.

Wood-to-Wood Joining Studs

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