M3 Knobs | McMaster-Carr

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42 Products

Stainless Steel Raised-Profile Knurled-Head Thumb Screws

The raised head gives your fingers extra space to grab these corrosion-resistant thumb screws, even with oily fingers. The knurled texture creates extra grip as you twist. Install these thumb screws on panels and covers for routinely serviced equipment, such as HVAC access doors and machine safety shields.

Length is measured from under the collar.

18-8 Stainless Steel—The choice for wet and outdoor environments, these screws resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

		Head, mm		Collar, mm
	Lg., mm	Dia.	Ht.	Dia.	Ht.	Threading	Tensile Strength, psi	Specs. Met		Each
18-8 Stainless Steel







				M3 × 0.5 mm

				6	12	2.5	6	5	Fully Threaded	80,000	DIN 464	000000000	00000


				10	12	2.5	6	5	Fully Threaded	80,000	DIN 464	000000000	0000
				12	12	2.5	6	5	Fully Threaded	80,000	DIN 464	000000000	0000
				16	12	2.5	6	5	Fully Threaded	80,000	DIN 464	000000000	0000

Plastic-Knurled-Head Thumb Screws

Combine the strength of stainless steel with a lightweight head that won't rust. These thumb screws are an economical alternative to fully metal thumb screws. The knurled texture of the head creates extra grip as you twist.

Length is measured from under the head.

18-8 Stainless Steel with Acetal Head—With a stainless steel body and an acetal head, these screws resist moisture and are chemical resistant.

		Head
	Lg., mm	Dia., mm	Ht., mm	Temp. Range, ° F	Threading	Tensile Strength	Choose a Head Color	Pkg. Qty.		Pkg.
18-8 Stainless Steel with Acetal Head







				M3 × 0.5 mm

				6	9.6	4.4	32 to 180	Fully Threaded	Not Rated	Black , Gray , Red , Yellow	10	000000000	00000


				8	9.6	4.4	32 to 180	Fully Threaded	Not Rated	Black , Gray , Red , Yellow	10	000000000	0000
				10	9.6	4.4	32 to 180	Fully Threaded	Not Rated	Black , Gray , Red , Yellow	10	000000000	0000
				12	9.6	4.4	32 to 180	Fully Threaded	Not Rated	Black , Gray , Red , Yellow	10	000000000	0000
				16	9.6	4.4	32 to 180	Fully Threaded	Not Rated	Black , Gray , Red , Yellow	10	000000000	0000
				20	9.6	4.4	32 to 180	Fully Threaded	Not Rated	Black , Gray , Red , Yellow	10	000000000	0000

Indicating Knobs


Style 2—Ribbed Grip	Style 3—Ribbed Grip

Control devices with round or D-shaped shafts and view settings at a glance with a pointer.

Phenolic—Phenolic knobs are a lightweight alternative to metal. They resist oil, grease, and solvents. Phenolic has good scratch resistance.

For Round Shafts—Knobs for round shafts include a set screw to secure them in place.

	Head		Hole							Each
	Dia.	Ht.	Dia.	Dp.	Cap Color	Insert Material	Set Screw Included	Temp. Range, ° F		1-9	10-Up
Style 2—Ribbed Grip







				Black Phenolic—For Round Shafts

				13/16"	1/2"	1/4"	7/16"	Silver	Brass	Yes	-30 to 400	0000000	00000	00000


				Style 3—Ribbed Grip







								Black Phenolic—For Round Shafts

								5/8"	9/16"	1/4"	7/16"	—	Brass	Yes	-30 to 400	0000000	0000	0000

Stainless Steel Knurled-Head Thumb Screws

Fasten panels and covers exposed to moisture and chemicals with these corrosion-resistant thumb screws. The knurled texture of the head creates extra grip as you twist.

Length is measured from under the head.

18-8 Stainless Steel—The choice for wet and outdoor environments, these screws resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

		Head, mm
	Lg., mm	Dia.	Ht.	Threading	Tensile Strength, psi		Each
18-8 Stainless Steel







				M3 × 0.5 mm

				8	8	5	Partially Threaded	90,000	000000000	00000


				9	8	5	Partially Threaded	90,000	000000000	0000
				11	8	5	Partially Threaded	90,000	000000000	0000
				13	8	5	Partially Threaded	90,000	000000000	0000

Stainless Steel Flared-Collar Knurled-Head Thumb Screws

A flared collar leaves more space for your fingers to grasp these corrosion-resistant thumb screws. It also serves as a decorative finish. The knurled texture on the head creates extra grip as you twist.

Length is measured from under the collar.

18-8 Stainless Steel—The choice for wet and outdoor environments, these screws resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

		Head, mm		Collar, mm
	Lg., mm	Dia.	Ht.	Dia.	Ht.	Threading	Tensile Strength, psi		Each
18-8 Stainless Steel







				M3 × 0.5 mm

				6	7.5	3	6	3.5	Fully Threaded	80,000	000000000	00000


				10	7.5	3	6	3.5	Fully Threaded	80,000	000000000	0000
				12	7.5	3	6	3.5	Fully Threaded	80,000	000000000	0000
				16	7.5	3	6	3.5	Fully Threaded	80,000	000000000	0000
				24	7.5	3	6	3.5	Fully Threaded	80,000	000000000	0000

Cam Handles

Use these standard cam handles for most clamping applications. Push down on the handle and the head applies pressure to quickly draw two parts together for fast adjustments.

Threaded-Hole Mount

Threaded-hole handles install on a threaded stud.

Powder-Coated Aluminum Handle—Powder-coated aluminum handles have mild corrosion resistance, are lightweight, and are nonmagnetic.

Clamping Distance—Clamping distance is how far the handle will draw parts together when clamped.

			Handle, mm
	Thread Size	Clamping Distance, mm	Lg.	Wd.	Ctr. Ht., mm	Clamped Ht., mm	Max. Clamping Force, lbf	Washer Material	Thrust Washer Material		Each
Black Powder-Coated Aluminum Handle



		M3 × 0.5 mm	1.2	36	12	9	13	325	Steel	Plastic	0000000	000000

Threaded-Stud Mount

Threaded-stud handles mount into a threaded hole.

Powder-Coated Aluminum Handle—Powder-coated aluminum handles have mild corrosion resistance, are lightweight, and are nonmagnetic.

Clamping Distance—Clamping distance is how far the handle will draw parts together when clamped.

	Thread			Handle, mm
	Size	Lg., mm	Clamping Distance, mm	Lg.	Wd.	Ctr. Ht., mm	Clamped Ht., mm	Max. Clamping Force, lbf	Stud Material	Washer Material	Thrust Washer Material		Each
Black Powder-Coated Aluminum Handle



		M3 × 0.5 mm	10	1.19	36	12	9	13	325	Steel	Steel	Plastic	0000000	000000


		M3 × 0.5 mm	15	1.19	36	12	9	13	325	Steel	Steel	Plastic	00000000	00000
		M3 × 0.5 mm	30	1.19	36	12	9	13	325	Steel	Steel	Plastic	00000000	00000

Steel Raised-Profile Knurled-Head Thumb Screws

The raised head gives your fingers extra space to grab these thumb screws, even with oily fingers. The knurled texture creates extra grip as you twist. Install these thumb screws on panels and covers for routinely serviced equipment, such as HVAC access doors and machine safety shields.

Length is measured from under the collar.

Black-Oxide Steel—Typically chosen for their appearance, these screws have a dark, matte coating to create a finished look. They offer minimal corrosion resistance, so they're best for dry environments.

		Head, mm		Collar, mm
	Lg., mm	Dia.	Ht.	Dia.	Ht.	Threading	Tensile Strength, psi	Specs. Met		Each
Black-Oxide Steel







				M3 × 0.5 mm

				6	12	2.5	6	5	Fully Threaded	70,000	DIN 464	000000000	00000


				10	12	2.5	6	5	Fully Threaded	70,000	DIN 464	000000000	0000
				12	12	2.5	6	5	Fully Threaded	70,000	DIN 464	000000000	0000
				16	12	2.5	6	5	Fully Threaded	70,000	DIN 464	000000000	0000

Stainless Steel Wing Thumb Screws

Corrosion resistant with a wing shape that's easy to grab. These thumb screws offer more leverage than spade-head thumb screws. Use these screws to fasten panels and covers that need frequent access.

Length is measured from under the head.

18-8 Stainless Steel—The choice for wet and outdoor environments, these screws resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

		Head, mm
	Lg., mm	Dia.	Wd.	Ht.	Threading	Tensile Strength	Specs. Met		Each
18-8 Stainless Steel







				M3 × 0.5 mm

				12	8	17.6	8.6	Fully Threaded	Not Rated	DIN 316	000000000	00000


				20	8	17.6	8.6	Fully Threaded	Not Rated	DIN 316	000000000	0000
				30	8	17.6	8.6	Fully Threaded	Not Rated	DIN 316	000000000	0000

Steel Knurled-Head Thumb Screws

Fasten panels and covers by hand. The knurled texture of the head creates extra grip as you twist.

Length is measured from under the head.

		Head, mm
	Lg., mm	Dia.	Ht.	Threading	Tensile Strength, psi	Specs. Met		Each
Black-Oxide Steel







				M3 × 0.5 mm

				6	12	2.5	Fully Threaded	70,000	DIN 653	000000000	00000


				10	12	2.5	Fully Threaded	70,000	DIN 653	000000000	0000
				16	12	2.5	Fully Threaded	70,000	DIN 653	000000000	0000

Aluminum Flared-Collar Knurled-Head Thumb Screws

Our most lightweight flared-collar thumb screws, these are one-third the weight of steel. The flared collar leaves more space for your fingers to grasp the head, and adds a decorative look. The knurled texture creates extra grip as you twist.

Length is measured from under the collar.

		Head, mm		Collar, mm
	Lg., mm	Dia.	Ht.	Dia.	Ht.	Threading	Tensile Strength, psi	Material	Pkg. Qty.		Pkg.
M3 × 0.5 mm



		8	10	5	9.5	3	Fully Threaded	55,000	2011 Aluminum	1	000000000	00000

Stainless Steel High-Profile Knurled-Head Thumb Screws

These corrosion-resistant thumb screws have a head that's twice as tall as low-profile ones for added leverage. Grasp and turn these screws, even with oily fingers. The knurled texture on the head creates extra grip as you twist. Install these thumb screws in regularly inspected and maintained equipment, such as safety enclosures on CNC machines.

Length is measured from under the head.

18-8 Stainless Steel—The choice for wet and outdoor environments, these screws resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

		Head, mm
	Lg., mm	Dia.	Ht.	Threading	Tensile Strength, psi		Each
18-8 Stainless Steel







				M3 × 0.5 mm

				6	9.5	7.9	Fully Threaded	80,000	000000000	00000


				10	9.5	7.9	Fully Threaded	80,000	000000000	0000

Quick-Release Shaft Collar Adjustable Handles

These threaded handles take the place of a set screw, allowing you to move set screw shaft collars without additional tools—useful for when the collar serves as a stroke limiter or mounting clamp. The handle keeps your collar secure on the shaft, then lets you loosen and tighten the collar for quick adjustments.

Black-Oxide 1215 Carbon Steel—Black-oxide 1215 carbon steel handles have some corrosion resistance.

2024 Aluminum—2024 aluminum handles are lightweight and have good corrosion resistance.

Thread					Black-Oxide 1215 Carbon Steel		2024 Aluminum
Size	Lg., mm	Overall Lg.	Handle Dia., mm	Handle Texture		Each		Each
M3 x 0.5 mm	7	3 1/4"	12.5	Knurled	0000000	000000	0000000	000000

Threaded-Hole-Mount Pull Handles

Style 13

Thread screws through holes from the back of your surface into the handles to open and close a variety of doors and drawers, including those on furniture, machines, and equipment.

Rectangular Grip—Rectangular grips have a flat surface that keeps your hand from slipping, but may be less comfortable than round and oval grips.

303 Stainless Steel—Stainless steel handles have excellent corrosion resistance, making them the best choice for harsh environments. They also have good chemical resistance.

	Mounting Hole		Thread		Grip, mm
	No. of	Ctr.-to-Ctr. Wd., mm	Size	Dp., mm	Ht.	Thk.	Projection, mm	Pull Cap.	Mounting Screw Lg., mm	Mounting Fasteners Included		Each
Style 13—Rectangular Grip







				303 Stainless Steel—Polished

				2	65	M3 × 0.5 mm	10	10	5	22.5	Not Rated	28	Yes	0000000	000000


				2	85	M3 × 0.5 mm	10	10	5	23	Not Rated	28	Yes	0000000	00000