Metric Thumb Screws | McMaster-Carr

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	System of Measurement System of Measurement

Metric

	Thread Type Thread Type

Metric

	Thread Size Thread Size

	Thread Pitch Thread Pitch

	Length Length

	Head Type Head Type


Thumb	Socket

	Material Material

	Thumb Screw Head Shape Thumb Screw Head Shape


Round	Spade

Wing	Multi-Lobe

Four Arm

	Head Diameter Head Diameter

	Round-Head Thumb Screw Profile Round-Head Thumb Screw Profile


Low	Raised

Flared Collar	Narrow

High

	Threading Threading

	Fully Threaded
	Partially Threaded

	Head Height Head Height

	Head Texture Head Texture


Knurled	Smooth

	Thread Direction Thread Direction

	Right Hand

	Grip Style Grip Style


Knurled	Four Arm

Seven Arm	Ribbed

Two Arm	Three Arm

Six Arm	Five Arm

Smooth

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

RoHS Compliant

RoHS Compliant with
Exemptions

	Mount Type Mount Type


Threaded Stud	Threaded Hole

Press Fit

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

REACH Compliant

	Thread Spacing Thread Spacing

Coarse

	Tensile Strength Tensile Strength

	Thread Fit Thread Fit

	Hardness Hardness

	Stud Length Stud Length

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About Shoulder Screws

Metric Stainless Steel Low-Profile
Knurled-Head Thumb Screws

These metric thumb screws are made of chemical-resistant 18-8 stainless steel. They have a thin, knurled head for use in low-clearance applications.

Metric Steel Low-Profile Knurled-Head Thumb Screws

These metric thumb screws have a thin, knurled head for use in low-clearance applications. They have a black-oxide finish to resist corrosion in dry environments.

Metric Stainless Steel Raised
Knurled-Head Thumb Screws

These metric thumb screws are made of chemical-resistant 18-8 stainless steel. They have a raised head that makes them easy to grip.

Metric Steel Raised Knurled-Head Thumb Screws

These metric thumb screws have a raised head that makes them easy to grip. A black-oxide finish provides corrosion resistance in dry environments.

Stainless Steel Flared-Collar
Knurled-Head Thumb Screws

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

Metric Narrow Knurled-Head Thumb Screws

With a slim profile, these metric thumb screws fit in tight spaces.

Stainless Steel High-Profile
Knurled-Head Thumb Screws

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

Metric Knurled Plastic-Head Thumb Screws

These metric thumb screws have a knurled head for a 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 Iron Spade-Head Thumb Screws

Sanitary Spade-Head Thumb Screws

Fasten material by hand, so tools don’t scratch or contaminate parts you frequently adjust in food-processing or pharmaceutical plants.

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.

Metric Four-Arm Extended-Tip Thumb Screws

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

Stainless Steel Wing-Head Thumb Screws

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

Metric Iron Wing-Head Thumb Screws

These metric thumb screws have wings that provide more leverage than spade-head thumb screws for greater torque while tightening. A zinc plating provides corrosion resistance in wet environments.

Socket Head Captive Panel Screws

Install these socket head screws through a hole and thread on a retainer to keep secure—no special tools are required.

Thumb-Screw-Head Captive Panel Screws

Install these thumb-screw-head screws through a hole and thread on a retainer to keep secure—no special tools are required.

Snap-In Captive Panel Screws

Snap these screws into panels up to 0.125" thick—no tools are required for installation.

Metric Thumb-Grip 18-8 Stainless
Steel Precision Shoulder Screws

Install and remove these metric shoulder screws by hand or with a hex key.

Metric 18-8 Stainless Steel Shoulder Screws

These screws have metric thread sizes. They are 18-8 stainless steel for good chemical resistance.

Metric 316 Stainless Steel Shoulder Screws

For metric thread sizes with excellent resistance to chemicals and salt water, choose these 316 stainless steel shoulder screws.

Knobs

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.

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.

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.

Threaded-Hole Knobs

Install these knobs on a threaded stud. They provide a secure grip to position, tighten, and hold fixtures, equipment, and machinery.

Comfort-Grip Threaded-Hole Knobs

A rubber coating provides a comfortable grip to position, tighten, and hold fixtures, equipment, and machinery. Install these knobs on a threaded stud.

Metal-Detectable Threaded-Hole Knobs

Position, tighten, and hold fixtures, equipment, and machinery near food processing lines without the risk of contaminating the food. Install these knobs on a threaded stud.

Screw-Head Mount Knobs

To build a custom knob or thumb screw, pair one of these knobs with a hex or socket head screw. They provide a secure grip to position, tighten, and hold fixtures, equipment, and machinery.

Screw-Head Mount Knob Assortments

Keep a convenient selection of knobs on hand. To build a custom knob or thumb screw, pair one of these knobs with a socket head screw. They provide a secure grip to position, tighten, and hold fixtures, equipment, and machinery.

Sanitary Threaded-Stud Pull Knobs

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