Thumb Screw Clamps | McMaster-Carr

	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

	Material Material

	Stud Length Stud Length

	Length Length

	Head Diameter Head Diameter

	Grip Style Grip Style


Four Arm	Knurled

Seven Arm	Three Arm

Ribbed	Five Arm

Two Arm	Smooth

Eight Arm	Six Arm

	Thumb Screw Head Shape Thumb Screw Head Shape


Round	Four Arm

Multi-Lobe	Two Arm

Hex	Rectangular

	Thread Direction Thread Direction


Right Hand	Left Hand

	Stud Material Stud Material

Steel

Stainless Steel

	Head Height Head Height

	Threading Threading

	Fully Threaded
	Partially Threaded

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

RoHS Compliant

RoHS Compliant with
Exemptions

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

REACH Compliant

	Hub Height Hub Height

	Hub Diameter Hub Diameter

	Head Color Head Color

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

DFARS Specialty Metals
COTS-Exempt

DFARS Specialty Metals
Compliant

	Color Color

	Black		White
	Blue		Green
	Orange		Red

	Clamp Type Clamp Type


Worm Drive	Wing Nut

Spring

	For Tube OD For Tube OD

	Thread Pitch Thread Pitch

	Thread Type Thread Type

1,173 Products

Control of Liquids, Gases, and Solids

General Purpose Worm-Drive Clamps with
Thumb Screw for Firm Hose and Tube

A thumb screw instead of a slotted screw allows you to install these clamps without any tools.

Clamps for High-Polish Metal
Quick-Clamp Sanitary Tube Fittings

Connect quick-clamp sanitary tube fittings—also known as aseptic fittings—for a fast and easy way to access your line.

Clamps for Extra-Support High-Polish
Metal Quick-Clamp Sanitary Tube Fittings

Connect extra-support quick-clamp fittings for a fast and easy way to access your line.

Extra-High-Polish Metal
Quick-Clamp Sanitary Tube Fittings

Polished to a 20 Ra finish, these fittings have an extra-smooth interior that prevents product buildup and inhibits bacteria growth.

Clamps for Quick-Clamp High-Vacuum
Fittings for Stainless Steel Tubing

Connect quick-clamp fittings in high-vacuum applications.

Noncontact Flow-Adjustment Valves

These valves press down on the outside of tubing to adjust flow without contacting the process media.

Plastic Noncontact Flow-Adjustment Valves

With no metal parts, these valves are often used for noncontact flow adjustment in wet conditions and harsh environments. All press down on the outside of tubing to adjust flow without contacting the process media.

Panel-Mount Noncontact Flow-Adjustment Valves

For installation in instrument panels, these valves have a hex nut and threads below the handle. They press down on the outside of tubing to adjust flow without contacting the process media.

Thumb Screws with Holding Tip

Large-Diameter Swivel-Tip Thumb Screws

A wide tip provides more gripping power than standard swivel-tip thumb screws. To use, remove the tip, thread the screw through the hole, and attach the tip on the other side.

Ultra-Flexible Swivel-Tip Thumb Screws

A large swivel angle allows these thumb screws to make better contact with angled and uneven surfaces than nonremovable swivel-tip thumb screws.

Swivel-Tip Thumb Screws

For maximum contact with angled and uneven surfaces, the tip swivels in all directions. The tip is narrow so it will fit through threaded holes.

Stainless Steel Knurled-Head
Extended-Tip Thumb Screws

Made from 18-8 stainless steel, these thumb screws are chemical resistant. Also known as dog- and pilot-point thumb screws, insert the point into a drilled hole or slot to hold items in place.

Metric Stainless Steel Knurled-Head
Extended-Tip Thumb Screws

These metric thumb screws are made of chemical-resistant 18-8 stainless steel. Also known as dog- and pilot-point thumb screws, insert the point into a drilled hole or slot to hold items in place.

Steel Knurled-Head Extended-Tip Thumb Screws

These steel thumb screws have a black-oxide finish to resist corrosion in dry environments.

Four-Arm Extended-Tip Thumb Screws

Arms provide a flat surface to push your fingers against.

Metric Four-Arm Extended-Tip Thumb Screws

These metric thumb screws have arms that provide a flat surface to push your fingers against.

Plastic-Head Thumb Screws

Two-Arm Plastic-Head Thumb Screws

Arms provide a flat surface to push your fingers against.

Knurled Plastic-Head Thumb Screws

A knurled head allows for slip-resistant controlled adjustment.

Metric Large-Grip Plastic-Head Thumb Screws

These metric thumb screws have a large head that allows you to grip them with your entire hand for greater torque while tightening than standard knurled plastic-head thumb screws.

Metric Knurled Plastic-Head Thumb Screws

These metric thumb screws have a knurled head for a slip-resistant controlled adjustment.

Large-Grip Plastic-Head Thumb Screws

A large head allows you to grip these screws with your entire hand for greater torque while tightening than standard knurled plastic-head thumb screws.

Plastic-Head Thumb Screws with Hex Drive

Tighten these thumb screws by hand or with a hex key for more torque.

Latching Thumb Screws

The head fits through a slit in a latch or panel to hold it in place.

Hex-Head Thumb Screws

Stainless Steel Hex-Head Thumb Screws

Stainless steel thumb screws have excellent corrosion resistance in most environments.

Steel Hex-Head Thumb Screws

These steel thumb screws have a black-oxide finish to resist corrosion in dry environments.

Threaded-Stud Knobs

Mount these knobs into a threaded hole. They provide a secure grip to position, tighten, and hold fixtures, equipment, and machinery.

Choose-a-Color Threaded-Stud Knobs

Identify equipment controls and components at a glance by their color. Mount these knobs into a threaded hole. They provide a secure grip to position, tighten, and hold fixtures, equipment, and machinery.

Vibration-Resistant Threaded-Stud Knobs

Bonded to the stud is an acrylic adhesive that adds friction to resist loosening from vibration. Use these knobs to position, tighten, and hold fixtures, equipment, and machinery. They mount into a threaded hole.

Metal-Detectable Threaded-Stud Knobs

Made for use in food processing facilities, these plastic knobs have a metal additive that sets off metal detectors if a piece breaks off into your line.

Comfort-Grip Threaded-Stud Knobs

A rubber coating provides a comfortable grip to position, tighten, and hold fixtures, equipment, and machinery. Mount these knobs into a threaded hole.

Tethered Threaded-Stud Knobs

Never lose these knobs—tether them to equipment to keep them where you need them. They provide a secure grip to position, tighten, and hold fixtures, equipment, and machinery. Mount them into a threaded hole.

Left-Hand Threaded-Stud Knobs

Knobs have left-hand threads; they're used in applications where counterclockwise motion can loosen common right-hand threads. Mount them into a threaded hole to position, tighten, and hold fixtures, equipment, and machinery.

Easy-Clean Threaded-Stud Knobs

Suitable for food-processing areas, these one-piece knobs have no joints to collect dirt or debris. They provide a secure grip to position, tighten, and hold fixtures, equipment, and machinery. Mount them into a threaded hole.

Palm-Grip Threaded-Stud Knobs

The domed top allows you to firmly hold these knobs in the palm of your hand to position, tighten, and hold fixtures, equipment, and machinery. Mount them into a threaded hole.

Threaded-Stud Precise-Control Knobs

Mount these knobs into a threaded hole. Turn the knob to move the stud 0.005" per graduation and make precise adjustments.

Sanitary Threaded-Stud Pull Knobs

Thread these sanitary knobs into holes so you can open doors and drawers in hygienic environments.

Create-Your-Own Workholders

Build a custom clamping system for holding lightweight objects such as beakers and laboratory equipment.