M3 Knobs | McMaster-Carr

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About Shaft Collars

Shaft collars are useful for holding and positioning components on a shaft. They can also serve as mechanical stops and stroke limiters.

About Thumb Screw and Binding Post Materials

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

Threaded-hole handles install on a threaded stud.

Threaded-stud handles mount into a threaded hole.

Aluminum handles have mild corrosion resistance, are lightweight, and are nonmagnetic.

For technical drawings and 3-D models, click on a part number.

Threaded Hole

With Threaded Hole

Thread			Handle
Size	Pitch, mm	Clamping Distance	Lg.	Wd.	Center Ht.	Clamped Ht.	Max. Clamping Force, lbs.	Washer Material	Thrust Washer Material		Each
Black Powder-Coated Aluminum
M3	0.5	1.2mm	36mm	12mm	9mm	13mm	325	Plastic	Plastic	0000000	000000

Threaded Stud

With Threaded Stud

Thread				Handle
Size	Pitch, mm	Lg.	Clamping Distance	Lg.	Wd.	Center Ht.	Clamped Ht.	Max. Clamping Force, lbs.	Stud Material	Washer Material	Thrust Washer Material		Each
Black Powder-Coated Aluminum
M3	0.5	10mm	1.19mm	36mm	12mm	9mm	13mm	325	Steel	Plastic	Plastic	0000000	000000
M3	0.5	15mm	1.19mm	36mm	12mm	9mm	13mm	325	Steel	Plastic	Plastic	00000000	00000
M3	0.5	30mm	1.19mm	36mm	12mm	9mm	13mm	325	Steel	Plastic	Plastic	00000000	00000

Threaded-Hole Pull Handles

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

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

For technical drawings and 3-D models, click on a part number.

	Grip				Thread
Mount. Hole Ctr.-to-Ctr. Wd.	Ht.	Thick.	Projection	Pull Cap., lbs.	Size	Pitch	Dp.	No. of Mount. Holes	Mount. Fasteners Included		Each
Style 13—Rectangular Grip
303 Stainless Steel—Polished
65mm	11mm	6mm	22mm	Not Rated	M3	0.5 mm	10mm	2	Yes	0000000	000000
85mm	11mm	6mm	24mm	Not Rated	M3	0.5 mm	10mm	2	Yes	0000000	00000

Metric Stainless Steel Raised Knurled-Head Thumb Screws

These 18-8 stainless steel thumb screws are chemical resistant and may be mildly magnetic. They have a raised head that makes them easy to grip. The head is knurled for slip-resistant controlled adjustment. Length is measured from under the collar.

For technical drawings and 3-D models, click on a part number.

	Head, mm		Collar, mm
Lg., mm	Dia.	Ht.	Dia.	Ht.	Tensile Strength, psi	Hardness	Specifications Met		Each
18-8 Stainless Steel
M3 × 0.5 mm
6	12	2.5	6	5	80,000	Rockwell B83	DIN 464	000000000	00000
10	12	2.5	6	5	80,000	Rockwell B83	DIN 464	000000000	0000
12	12	2.5	6	5	80,000	Rockwell B83	DIN 464	000000000	0000
16	12	2.5	6	5	80,000	Rockwell B83	DIN 464	000000000	0000

Metric Steel Raised Knurled-Head Thumb Screws

These thumb screws have a raised head that makes them easy to grip. The head is knurled for slip-resistant controlled adjustment. A black-oxide finish provides corrosion resistance in dry environments. Length is measured from under the collar.

For technical drawings and 3-D models, click on a part number.

	Head, mm		Collar, mm
Lg., mm	Dia.	Ht.	Dia.	Ht.	Tensile Strength, psi	Hardness	Specifications Met		Each
Black-Oxide Steel
M3 × 0.5 mm
6	12	2.5	6	5	70,000	Rockwell B84	DIN 464	000000000	00000
10	12	2.5	6	5	70,000	Rockwell B84	DIN 464	000000000	0000
12	12	2.5	6	5	70,000	Rockwell B84	DIN 464	000000000	0000
16	12	2.5	6	5	70,000	Rockwell B84	DIN 464	000000000	0000

Stainless Steel Flared-Collar Knurled-Head Thumb Screws

Made from 18-8 stainless steel, these thumb screws are chemical resistant and may be mildly magnetic. They have a slightly raised head and a decorative flared collar. The head is knurled for slip-resistant controlled adjustment. Length is measured from under the flange.

For technical drawings and 3-D models, click on a part number.

	Head		Collar
Lg.	Dia.	Ht.	Dia.	Ht.	Tensile Strength, psi	Hardness		Each
18-8 Stainless Steel
M3 × 0.5 mm
6mm	7.5mm	3mm	6mm	3.5mm	80,000	Rockwell B85	000000000	00000
10mm	7.5mm	3mm	6mm	3.5mm	80,000	Rockwell B85	000000000	0000
12mm	7.5mm	3mm	6mm	3.5mm	80,000	Rockwell B85	000000000	0000
16mm	7.5mm	3mm	6mm	3.5mm	80,000	Rockwell B85	000000000	0000
24mm	7.5mm	3mm	6mm	3.5mm	80,000	Rockwell B85	000000000	0000

Aluminum Flared-Collar Knurled-Head Thumb Screws

These thumb screws are lightweight, corrosion resistant in wet environments, and nonmagnetic. They have a slightly raised head and a decorative flared collar. The head is knurled for slip-resistant controlled adjustment. Length is measured from under the flange.

For technical drawings and 3-D models, click on a part number.

	Head		Collar
Lg.	Dia.	Ht.	Dia.	Ht.	Tensile Strength, psi	Hardness	Pkg. Qty.		Pkg.
2011 Aluminum
M3 × 0.5mm
8mm	10mm	5mm	9.5mm	3mm	55,000	Rockwell B75	1	000000000	00000

Metric Stainless Steel Low-Profile Knurled-Head Thumb Screws

Made from 18-8 stainless steel, these thumb screws are chemical resistant and may be mildly magnetic. They have a thin head for use in low-clearance applications. The head is knurled for slip-resistant controlled adjustment. Length is measured from under the head.

For technical drawings and 3-D models, click on a part number.

		Head, mm
Lg., mm	Thread Length	Dia.	Ht.	Tensile Strength, psi	Hardness		Each
18-8 Stainless Steel
M3 × 0.5 mm
8	6.5mm	8	5	90,000	Rockwell B96	000000000	00000
9	7.5mm	8	5	90,000	Rockwell B96	000000000	0000
11	9.5mm	8	5	90,000	Rockwell B96	000000000	0000
13	11.5mm	8	5	90,000	Rockwell B96	000000000	0000

Metric Steel Low-Profile Knurled-Head Thumb Screws

These thumb screws have a thin head for use in low-clearance applications. The head is knurled for slip-resistant controlled adjustment. They have a black-oxide finish to resist corrosion in dry environments. Length is measured from under the head.

For technical drawings and 3-D models, click on a part number.

	Head, mm
Lg., mm	Dia.	Ht.	Tensile Strength, psi	Hardness	Specifications Met		Each
Black-Oxide Steel
M3 × 0.5 mm
6	12	2.5	70,000	Rockwell B84	DIN 653	000000000	00000
10	12	2.5	70,000	Rockwell B84	DIN 653	000000000	0000
16	12	2.5	70,000	Rockwell B84	DIN 653	000000000	0000

Stainless Steel High-Profile Knurled-Head Thumb Screws

Made from 18-8 stainless steel, these thumb screws are chemical resistant and may be mildly magnetic. A tall head allows for more leverage and greater torque while tightening than low-profile thumb screws. The head is knurled for slip-resistant controlled adjustment. Length is measured from under the head.

For technical drawings and 3-D models, click on a part number.

	Head
Lg.	Dia.	Ht.	Tensile Strength, psi	Hardness		Each
18-8 Stainless Steel
M3 × 0.5mm
6mm	9.5mm	7.9mm	80,000	Rockwell B83	000000000	00000
10mm	9.5mm	7.9mm	80,000	Rockwell B83	000000000	0000

Metric Knurled Plastic-Head Thumb Screws

A knurled head allows for slip-resistant controlled adjustment. They have a lightweight and nonconductive plastic head and chemical-resistant 18-8 stainless steel threads. Length is measured from under the head.

For technical drawings and 3-D models, click on a part number.

	Head
Lg., mm	Dia., mm	Ht., mm	Temperature Range, °F	Choose a Head Color	Pkg. Qty.		Pkg.
18-8 Stainless Steel
M3 × 0.5 mm
6	9.6	4.4	32° to 180°	Black, Gray, Red, Yellow	10	000000000	00000
8	9.6	4.4	32° to 180°	Black, Gray, Red, Yellow	10	000000000	0000
10	9.6	4.4	32° to 180°	Black, Gray, Red, Yellow	10	000000000	0000
12	9.6	4.4	32° to 180°	Black, Gray, Red, Yellow	10	000000000	0000
16	9.6	4.4	32° to 180°	Black, Gray, Red, Yellow	10	000000000	0000
20	9.6	4.4	32° to 180°	Black, Gray, Red, Yellow	10	000000000	0000

Stainless Steel Wing-Head Thumb Screws

Made from 18-8 stainless steel, these thumb screws are chemical resistant and may be mildly magnetic. Wings provide more leverage than spade-head thumb screws for greater torque while tightening. Length is measured from under the head.

For technical drawings and 3-D models, click on a part number.

	Head
Lg.	Wd.	Ht.	Specifications Met		Each
18-8 Stainless Steel
M3 × 0.5 mm
12mm	17.6mm	8.6mm	DIN 316	000000000	00000
20mm	17.6mm	8.6mm	DIN 316	000000000	000
30mm	17.6mm	8.6mm	DIN 316	000000000	0000

Quick-Release Shaft Collar 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 steel handles have some corrosion resistance. Aluminum handles are lightweight and have good corrosion resistance.

For technical drawings and 3-D models, click on a part number.

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