Type P Thumb Screws | McMaster-Carr

	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

	Thread Type Thread Type

UNC

UNF

Metric

	Length Length

	Material Material

	Head Height Head Height

	Head Width Head Width

	Thread Spacing Thread Spacing

Coarse

Fine

	Hardness Hardness

	Tensile Strength Tensile Strength

40,000 psi

50,000 psi

Not Rated

	Thread Fit Thread Fit

Class 2A

Class 6g

Class 8g

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

RoHS Compliant

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

DFARS Specialty Metals
COTS-Exempt

DFARS Specialty Metals
Compliant

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

REACH Compliant

	Thread Pitch Thread Pitch

	Tip Diameter Tip Diameter

	Tip Length Tip Length

	Environment Environment

161 Products

About Thumb Screw and Binding Post Materials

Length is measured from under the head.

Zinc-plated thumb screws are corrosion resistant in wet environments.

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

	Head
Lg.	Wd.	Ht.	Tensile Strength, psi	Hardness	Pkg. Qty.		Pkg.
Steel
6-32
1/4"	3/8"	1/4"	40,000	Rockwell B55	50	000000000	000000
3/8"	3/8"	1/4"	40,000	Rockwell B55	50	000000000	00000
1/2"	3/8"	1/4"	40,000	Rockwell B55	50	000000000	00000
3/4"	3/8"	1/4"	40,000	Rockwell B55	50	000000000	00000
1"	3/8"	1/4"	40,000	Rockwell B55	50	000000000	00000
8-32
3/8"	15/32"	1/4"	40,000	Rockwell B55	50	000000000	00000
1/2"	15/32"	1/4"	40,000	Rockwell B55	50	000000000	00000
3/4"	15/32"	1/4"	40,000	Rockwell B55	50	000000000	00000
1"	15/32"	1/4"	40,000	Rockwell B55	50	000000000	00000
10-24
3/8"	9/16"	3/8"	40,000	Rockwell B55	50	000000000	00000
1/2"	9/16"	3/8"	40,000	Rockwell B55	50	000000000	00000
3/4"	9/16"	3/8"	40,000	Rockwell B55	50	000000000	00000
1"	9/16"	3/8"	40,000	Rockwell B55	50	000000000	00000
1 1/2"	9/16"	3/8"	40,000	Rockwell B55	25	000000000	0000
10-32
3/8"	9/16"	3/8"	40,000	Rockwell B55	50	000000000	00000
1/2"	9/16"	3/8"	40,000	Rockwell B55	50	000000000	00000
3/4"	9/16"	3/8"	40,000	Rockwell B55	50	000000000	00000
1"	9/16"	3/8"	40,000	Rockwell B55	50	000000000	00000
1 1/2"	9/16"	3/8"	40,000	Rockwell B55	25	000000000	00000
2"	9/16"	3/8"	40,000	Rockwell B55	25	000000000	00000
1/4"-20
1/2"	23/32"	1/2"	40,000	Rockwell B55	25	000000000	0000
3/4"	23/32"	1/2"	40,000	Rockwell B55	25	000000000	0000
1"	23/32"	1/2"	40,000	Rockwell B55	25	000000000	0000
1 1/4"	23/32"	1/2"	40,000	Rockwell B55	25	000000000	0000
1 1/2"	23/32"	1/2"	40,000	Rockwell B55	25	000000000	00000
2"	23/32"	1/2"	40,000	Rockwell B55	25	000000000	00000
2 1/2"	23/32"	1/2"	40,000	Rockwell B55	25	000000000	00000
3"	23/32"	1/2"	40,000	Rockwell B55	10	000000000	0000
1/4"-28
1/2"	23/32"	1/2"	40,000	Rockwell B55	10	000000000	0000
3/4"	23/32"	1/2"	40,000	Rockwell B55	10	000000000	0000
1"	23/32"	1/2"	40,000	Rockwell B55	10	000000000	0000
5/16"-18
1/2"	7/8"	11/16"	40,000	Rockwell B55	25	000000000	00000
3/4"	7/8"	11/16"	40,000	Rockwell B55	25	000000000	00000
1"	7/8"	11/16"	40,000	Rockwell B55	25	000000000	00000
1 1/4"	7/8"	11/16"	40,000	Rockwell B55	25	000000000	00000
1 1/2"	7/8"	11/16"	40,000	Rockwell B55	25	000000000	00000
2"	7/8"	11/16"	40,000	Rockwell B55	10	000000000	0000
5/16"-24
3/4"	7/8"	11/16"	40,000	Rockwell B55	10	000000000	0000
1"	7/8"	11/16"	40,000	Rockwell B55	10	000000000	00000
1 1/2"	7/8"	11/16"	40,000	Rockwell B55	10	000000000	00000
3/8"-16
3/4"	1 3/32"	13/16"	40,000	Rockwell B55	25	000000000	00000
1"	1 3/32"	13/16"	40,000	Rockwell B55	10	000000000	0000
1 1/4"	1 3/32"	13/16"	40,000	Rockwell B55	10	000000000	0000
1 1/2"	1 3/32"	13/16"	40,000	Rockwell B55	10	000000000	0000
2"	1 3/32"	13/16"	40,000	Rockwell B55	10	000000000	0000
3"	1 3/32"	13/16"	40,000	Rockwell B55	10	000000000	00000
Zinc-Plated Steel
6-32
3/8"	3/8"	1/4"	40,000	Rockwell B55	25	000000000	00000
1/2"	3/8"	1/4"	40,000	Rockwell B55	25	000000000	00000
3/4"	3/8"	1/4"	40,000	Rockwell B55	25	000000000	00000
1"	3/8"	1/4"	40,000	Rockwell B55	25	000000000	00000
8-32
3/8"	15/32"	1/4"	40,000	Rockwell B55	25	000000000	00000
1/2"	15/32"	1/4"	40,000	Rockwell B55	25	000000000	00000
3/4"	15/32"	1/4"	40,000	Rockwell B55	25	000000000	00000
1"	15/32"	1/4"	40,000	Rockwell B55	25	000000000	00000
10-24
3/8"	9/16"	3/8"	40,000	Rockwell B55	25	000000000	00000
1/2"	9/16"	3/8"	40,000	Rockwell B55	25	000000000	00000
3/4"	9/16"	3/8"	40,000	Rockwell B55	25	000000000	00000
1"	9/16"	3/8"	40,000	Rockwell B55	25	000000000	00000
10-32
3/8"	9/16"	3/8"	40,000	Rockwell B55	25	000000000	00000
1/2"	9/16"	3/8"	40,000	Rockwell B55	25	000000000	00000
3/4"	9/16"	3/8"	40,000	Rockwell B55	25	000000000	00000
1"	9/16"	3/8"	40,000	Rockwell B55	25	000000000	00000
1 1/2"	9/16"	3/8"	40,000	Rockwell B55	25	000000000	00000
2"	9/16"	3/8"	40,000	Rockwell B55	25	000000000	00000
1/4"-20
1/2"	23/32"	1/2"	40,000	Rockwell B55	25	000000000	00000
3/4"	23/32"	1/2"	40,000	Rockwell B55	25	000000000	00000
1"	23/32"	1/2"	40,000	Rockwell B55	25	000000000	00000
1 1/4"	23/32"	1/2"	40,000	Rockwell B55	25	000000000	00000
1 1/2"	23/32"	1/2"	40,000	Rockwell B55	25	000000000	00000
2"	23/32"	1/2"	40,000	Rockwell B55	25	000000000	00000
5/16"-18
1/2"	7/8"	11/16"	40,000	Rockwell B55	10	000000000	0000
3/4"	7/8"	11/16"	40,000	Rockwell B55	10	000000000	0000
1"	7/8"	11/16"	40,000	Rockwell B55	10	000000000	0000
1 1/4"	7/8"	11/16"	40,000	Rockwell B55	10	000000000	0000
1 1/2"	7/8"	11/16"	40,000	Rockwell B55	10	000000000	0000
2"	7/8"	11/16"	40,000	Rockwell B55	10	000000000	0000
3/8"-16
3/4"	1 3/32"	13/16"	40,000	Rockwell B55	10	000000000	0000
1"	1 3/32"	13/16"	40,000	Rockwell B55	10	000000000	00000
1 1/4"	1 3/32"	13/16"	40,000	Rockwell B55	10	000000000	00000
1 1/2"	1 3/32"	13/16"	40,000	Rockwell B55	10	000000000	00000
2"	1 3/32"	13/16"	40,000	Rockwell B55	10	000000000	00000

Metric Iron Spade-Head Thumb Screws

These thumb screws have a zinc plating to resist corrosion in wet environments. Length is measured from under the head.

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

	Head, mm
Lg., mm	Wd.	Ht.	Pkg. Qty.		Pkg.
Zinc-Plated Cast Iron
M5 × 0.8 mm
10	20.5	15.5	5	000000000	000000
16	20.5	15.5	5	000000000	00000
20	20.5	15.5	5	000000000	00000
M6 × 1 mm
10	23.5	16	1	000000000	0000
16	23.5	16	5	000000000	00000
20	23.5	16	5	000000000	00000
30	23.5	16	1	000000000	0000
M8 × 1.25 mm
16	27.5	19	1	000000000	0000
20	27.5	19	1	000000000	0000

Stainless Steel Spade-Head Thumb Screws

Made from 18-8 stainless steel, these thumb screws are chemical resistant and may be mildly magnetic. Length is measured from under the head.

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

	Head
Lg.	Wd.	Ht.	Pkg. Qty.		Pkg.
18-8 Stainless Steel
8-32
3/8"	15/32"	1/4"	10	000000000	000000
1/2"	15/32"	1/4"	10	000000000	00000
5/8"	15/32"	1/4"	5	000000000	0000
3/4"	15/32"	1/4"	5	000000000	0000
1"	15/32"	1/4"	5	000000000	0000
10-24
3/8"	9/16"	3/8"	10	000000000	00000
1/2"	9/16"	3/8"	10	000000000	00000
3/4"	9/16"	3/8"	5	000000000	0000
1"	9/16"	3/8"	5	000000000	0000
1 1/2"	9/16"	3/8"	5	000000000	0000
10-32
3/8"	9/16"	3/8"	10	000000000	00000
1/2"	9/16"	3/8"	10	000000000	00000
3/4"	9/16"	3/8"	5	000000000	0000
1"	9/16"	3/8"	5	000000000	0000
1 1/2"	9/16"	3/8"	5	000000000	00000
1/4"-20
3/8"	23/32"	1/2"	5	000000000	0000
1/2"	23/32"	1/2"	10	000000000	00000
5/8"	23/32"	1/2"	5	000000000	0000
3/4"	23/32"	1/2"	5	000000000	0000
1"	23/32"	1/2"	5	000000000	0000
1 1/4"	23/32"	1/2"	5	000000000	0000
1 1/2"	23/32"	1/2"	5	000000000	0000
2"	23/32"	1/2"	5	000000000	00000
5/16"-18
1/2"	7/8"	11/16"	5	000000000	00000
3/4"	7/8"	11/16"	5	000000000	00000
1"	7/8"	11/16"	5	000000000	00000
1 1/4"	7/8"	11/16"	5	000000000	00000
1 1/2"	7/8"	11/16"	5	000000000	00000
2"	7/8"	11/16"	1	000000000	0000
3/8"-16
3/4"	1 1/32"	13/16"	1	000000000	0000
1"	1 1/32"	13/16"	1	000000000	0000
1 1/4"	1 1/32"	13/16"	1	000000000	0000
1 1/2"	1 1/32"	13/16"	1	000000000	0000
2"	1 1/32"	13/16"	1	000000000	0000

Brass Spade-Head Thumb Screws

These thumb screws are corrosion resistant in wet environments, electrically conductive, and nonmagnetic. Length is measured from under the head.

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

	Head
Lg.	Wd.	Ht.	Tensile Strength, psi	Hardness	Pkg. Qty.		Pkg.
Brass
10-24
1/2"	9/16"	3/8"	50,000	Rockwell B40	5	000000000	00000
3/4"	9/16"	3/8"	50,000	Rockwell B40	5	000000000	00000
1"	9/16"	3/8"	50,000	Rockwell B40	5	000000000	00000
10-32
1/2"	9/16"	3/8"	50,000	Rockwell B40	5	000000000	0000
3/4"	9/16"	3/8"	50,000	Rockwell B40	5	000000000	00000
1"	9/16"	3/8"	50,000	Rockwell B40	5	000000000	00000
1/4"-20
1/2"	23/32"	1/2"	50,000	Rockwell B40	5	000000000	0000
3/4"	23/32"	1/2"	50,000	Rockwell B40	5	000000000	0000
1"	23/32"	1/2"	50,000	Rockwell B40	5	000000000	00000
1 1/2"	23/32"	1/2"	50,000	Rockwell B40	5	000000000	00000
2"	23/32"	1/2"	50,000	Rockwell B40	1	000000000	0000
5/16"-18
3/4"	7/8"	11/16"	50,000	Rockwell B40	1	000000000	0000
1"	7/8"	11/16"	50,000	Rockwell B40	1	000000000	0000
1 1/2"	7/8"	11/16"	50,000	Rockwell B40	1	000000000	0000
2"	7/8"	11/16"	50,000	Rockwell B40	1	000000000	0000
3/8"-16
1"	1 3/32"	13/16"	50,000	Rockwell B40	1	000000000	0000
1 1/2"	1 3/32"	13/16"	50,000	Rockwell B40	1	000000000	0000
2"	1 3/32"	13/16"	50,000	Rockwell B40	1	000000000	0000

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. Made from 316 stainless steel, these thumb screws won’t corrode from frequent washdowns with water or harsh cleaners. They have self-draining surfaces, which means there are no horizontal ledges, so liquid and food will run off completely. The smooth, polished sides and rounded edges minimize spots where bacteria could grow.

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

	Head, mm
Lg., mm	Wd.	Ht.		Each
316 Stainless Steel
M4 × 0.7 mm
8	20	19	00000000	000000
M5 × 0.8 mm
10	21	21	00000000	00000
M6 × 1 mm
12	25	25	00000000	00000
M8 × 1.25 mm
16	33	33	00000000	00000
M10 × 1.5 mm
20	40	40	00000000	00000

Soft-Tip Thumb Screws

A soft nylon tip conforms to textured surfaces and minimizes damage when holding items in place. These screws are zinc-plated steel for corrosion resistance in wet environments. Length is measured from under the head.

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

	Tip		Head
Lg.	Dia.	Lg.	Wd.	Ht.	Tensile Strength, psi	Hardness		Each
Zinc-Plated Steel
6-32
1/2"	1/16"	1/32"	13/32"	19/64"	40,000	Rockwell B71	000000000	00000
8-32
1/2"	3/32"	3/64"	7/16"	19/64"	40,000	Rockwell B71	000000000	0000
3/4"	3/32"	3/64"	7/16"	19/64"	40,000	Rockwell B71	000000000	0000
10-32
1/2"	3/32"	3/64"	35/64"	7/16"	40,000	Rockwell B71	000000000	0000
3/4"	3/32"	3/64"	35/64"	7/16"	40,000	Rockwell B71	000000000	0000
1"	3/32"	3/64"	35/64"	7/16"	40,000	Rockwell B71	000000000	0000
1/4"-20
1/2"	1/8"	1/16"	13/16"	35/64"	40,000	Rockwell B71	000000000	0000
3/4"	1/8"	1/16"	13/16"	35/64"	40,000	Rockwell B71	000000000	0000
1"	1/8"	1/16"	13/16"	35/64"	40,000	Rockwell B71	000000000	0000
5/16"-18
1/2"	3/16"	3/32"	7/8"	43/64"	40,000	Rockwell B71	000000000	0000
3/4"	3/16"	3/32"	7/8"	43/64"	40,000	Rockwell B71	000000000	0000
1"	3/16"	3/32"	7/8"	43/64"	40,000	Rockwell B71	000000000	0000
3/8"-16
1"	3/16"	3/32"	1 1/64"	3/4"	40,000	Rockwell B71	000000000	00000
1 1/2"	3/16"	3/32"	1 1/64"	3/4"	40,000	Rockwell B71	000000000	00000