Vacuum Bolts | McMaster-Carr

	System of Measurement System of Measurement

Metric

Inch

	Thread Size Thread Size

	Thread Pitch Thread Pitch

	Thread Type Thread Type

UNC

UNF

Metric

	Length Length

	Head Type Head Type


Socket	Headless

	Head Diameter Head Diameter

	Head Height Head Height

	Drive Size Drive Size

	Thread Fit Thread Fit

Class 3A

Class 6g

	Thread Spacing Thread Spacing

Coarse

Fine

	Hardness Hardness

Rockwell B70

Not Rated

	Environmental Rating Environmental Rating

Fed. Std. Class 100

ISO Class 5

	Specifications Met Specifications Met

DIN

ISO

ASME

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

RoHS Compliant

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

REACH Compliant

	Vent Diameter Vent Diameter

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About Socket Head Screws

About Set Screws

Cleaned and double bagged in an ISO Class 5 (Fed. Std. Class 100) clean room, these screws are ready to use on chambers and components in high-vacuum systems. 18-8 stainless steel releases gas at a slower rate than other metals, allowing your system to achieve higher levels of vacuum. Screws are silver plated for lubricity, reducing wear over time. Length is measured from under the head.

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

			Head
Lg.	Threading	Thread Spacing	Dia.	Ht.	Drive Size	Tensile Strength, psi	Environmental Rating	Specifications Met		Each
Silver-Plated 18-8 Stainless Steel
4-40
1/2"	Fully Threaded	Coarse	0.183"	0.112"	3/32"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	000000
3/4"	Fully Threaded	Coarse	0.183"	0.112"	3/32"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	00000
1"	Fully Threaded	Coarse	0.183"	0.112"	3/32"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	00000
6-32
1/2"	Fully Threaded	Coarse	0.226"	0.138"	7/64"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	00000
3/4"	Fully Threaded	Coarse	0.226"	0.138"	7/64"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	00000
1"	Fully Threaded	Coarse	0.226"	0.138"	7/64"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	00000
8-32
1/2"	Fully Threaded	Coarse	0.27"	0.164"	9/64"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	00000
3/4"	Fully Threaded	Coarse	0.27"	0.164"	9/64"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	00000
1"	Fully Threaded	Coarse	0.27"	0.164"	9/64"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	00000
10-32
1/2"	Fully Threaded	Fine	5/16"	0.19"	5/32"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	00000
3/4"	Fully Threaded	Fine	5/16"	0.19"	5/32"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	00000
1"	Fully Threaded	Fine	5/16"	0.19"	5/32"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	00000
1/4"-20
1/2"	Fully Threaded	Coarse	3/8"	1/4"	3/16"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	00000
3/4"	Fully Threaded	Coarse	3/8"	1/4"	3/16"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	00000
1"	Fully Threaded	Coarse	3/8"	1/4"	3/16"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	00000
M3 × 0.5 mm
8mm	Fully Threaded	Coarse	5.5mm	3mm	2.5 mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
10mm	Fully Threaded	Coarse	5.5mm	3mm	2.5 mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
12mm	Fully Threaded	Coarse	5.5mm	3mm	2.5 mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
M4 × 0.7 mm
8mm	Fully Threaded	Coarse	7mm	4mm	3 mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
10mm	Fully Threaded	Coarse	7mm	4mm	3 mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
12mm	Fully Threaded	Coarse	7mm	4mm	3 mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
M5 × 0.8 mm
8mm	Fully Threaded	Coarse	8.5mm	5mm	4 mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
10mm	Fully Threaded	Coarse	8.5mm	5mm	4 mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
12mm	Fully Threaded	Coarse	8.5mm	5mm	4 mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
M6 × 1 mm
8mm	Fully Threaded	Coarse	10mm	6mm	5 mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
10mm	Fully Threaded	Coarse	10mm	6mm	5 mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
12mm	Fully Threaded	Coarse	10mm	6mm	5 mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000

High-Vacuum Cleaned-and-Bagged Vented Socket Head Screws

Fasten these screws inside a high-vacuum system without bringing in contaminants. They are cleaned and double-bagged in an ISO Class 5 (Fed. Std. Class 100) clean room to eliminate impurities. A vent through the center allows fluids and gases to escape, which reduces the time it takes to reach vacuum conditions. These screws are 18-8 stainless steel, which emits less gas than most metals and stands up to corrosive chemicals. Length is measured from under the head.

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

			Head
Lg.	Threading	Thread Spacing	Dia.	Ht.	Drive Size	Vent Dia.	Tensile Strength, psi	Environmental Rating	Specifications Met		Each
18-8 Stainless Steel
4-40
1/2"	Fully Threaded	Coarse	0.183"	0.112"	3/32"	0.036"	70,000	Fed. Std. Class 100, ISO Class 5	ASME B18.3	000000000	000000
3/4"	Fully Threaded	Coarse	0.183"	0.112"	3/32"	0.036"	70,000	Fed. Std. Class 100, ISO Class 5	ASME B18.3	000000000	00000
1"	Fully Threaded	Coarse	0.183"	0.112"	3/32"	0.036"	70,000	Fed. Std. Class 100, ISO Class 5	ASME B18.3	000000000	00000
6-32
1/2"	Fully Threaded	Coarse	0.226"	0.138"	7/64"	0.04"	70,000	Fed. Std. Class 100, ISO Class 5	ASME B18.3	000000000	00000
3/4"	Fully Threaded	Coarse	0.226"	0.138"	7/64"	0.04"	70,000	Fed. Std. Class 100, ISO Class 5	ASME B18.3	000000000	00000
1"	Fully Threaded	Coarse	0.226"	0.138"	7/64"	0.04"	70,000	Fed. Std. Class 100, ISO Class 5	ASME B18.3	000000000	00000
8-32
1/2"	Fully Threaded	Coarse	0.27"	0.164"	9/64"	0.042"	70,000	Fed. Std. Class 100, ISO Class 5	ASME B18.3	000000000	00000
3/4"	Fully Threaded	Coarse	0.27"	0.164"	9/64"	0.042"	70,000	Fed. Std. Class 100, ISO Class 5	ASME B18.3	000000000	00000
1"	Fully Threaded	Coarse	0.27"	0.164"	9/64"	0.042"	70,000	Fed. Std. Class 100, ISO Class 5	ASME B18.3	000000000	00000
10-32
1/2"	Fully Threaded	Fine	5/16"	0.19"	5/32"	0.052"	70,000	Fed. Std. Class 100, ISO Class 5	ASME B18.3	000000000	00000
3/4"	Fully Threaded	Fine	5/16"	0.19"	5/32"	0.052"	70,000	Fed. Std. Class 100, ISO Class 5	ASME B18.3	000000000	00000
1"	Fully Threaded	Fine	5/16"	0.19"	5/32"	0.052"	70,000	Fed. Std. Class 100, ISO Class 5	ASME B18.3	000000000	00000
1/4"-20
1/2"	Fully Threaded	Coarse	3/8"	1/4"	3/16"	0.063"	70,000	Fed. Std. Class 100, ISO Class 5	ASME B18.3	000000000	00000
3/4"	Fully Threaded	Coarse	3/8"	1/4"	3/16"	0.063"	70,000	Fed. Std. Class 100, ISO Class 5	ASME B18.3	000000000	00000
1"	Fully Threaded	Coarse	3/8"	1/4"	3/16"	0.063"	70,000	Fed. Std. Class 100, ISO Class 5	ASME B18.3	000000000	00000
M3 × 0.5 mm
8mm	Fully Threaded	Coarse	5.5mm	3mm	2.5 mm	1mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
10mm	Fully Threaded	Coarse	5.5mm	3mm	2.5 mm	1mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
12mm	Fully Threaded	Coarse	5.5mm	3mm	2.5 mm	1mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
M4 × 0.7 mm
8mm	Fully Threaded	Coarse	7mm	4mm	3 mm	1.1mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
10mm	Fully Threaded	Coarse	7mm	4mm	3 mm	1.1mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
12mm	Fully Threaded	Coarse	7mm	4mm	3 mm	1.1mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
M5 × 0.8 mm
8mm	Fully Threaded	Coarse	8.5mm	5mm	4 mm	1.3mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
10mm	Fully Threaded	Coarse	8.5mm	5mm	4 mm	1.3mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
12mm	Fully Threaded	Coarse	8.5mm	5mm	4 mm	1.3mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
M6 × 1 mm
8mm	Fully Threaded	Coarse	10mm	6mm	5 mm	1.6mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
10mm	Fully Threaded	Coarse	10mm	6mm	5 mm	1.6mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
12mm	Fully Threaded	Coarse	10mm	6mm	5 mm	1.6mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000

Vented Cup-Point Set Screws

These set screws are vented to allow fluid and gas to pass through. A cup point with a thin edge digs into the contact surface for a secure hold. Made from 18-8 stainless steel, these set screws are chemical resistant and may be mildly magnetic. Length listed is the overall length.

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

18-8 Stainless Steel
Lg.	Vent Dia.	Drive Size	Hardness	Pkg. Qty.		Pkg.
2-56
3/32"	0.028"	0.035"	Not Rated	10	000000000	00000
1/8"	0.028"	0.035"	Not Rated	10	000000000	0000
3/16"	0.028"	0.035"	Not Rated	10	000000000	0000
4-40
1/8"	0.035"	0.050"	Not Rated	10	000000000	0000
3/16"	0.035"	0.050"	Not Rated	10	000000000	0000
1/4"	0.035"	0.050"	Not Rated	10	000000000	0000
3/8"	0.035"	0.050"	Not Rated	10	000000000	0000
6-32
1/8"	0.038"	1/16"	Not Rated	10	000000000	0000
3/16"	0.038"	1/16"	Not Rated	10	000000000	0000
1/4"	0.038"	1/16"	Not Rated	10	000000000	0000
3/8"	0.038"	1/16"	Not Rated	10	000000000	0000
8-32
1/8"	0.042"	5/64"	Not Rated	10	000000000	0000
3/16"	0.042"	5/64"	Not Rated	10	000000000	0000
1/4"	0.042"	5/64"	Not Rated	10	000000000	0000
3/8"	0.042"	5/64"	Not Rated	5	000000000	0000
1/2"	0.042"	5/64"	Not Rated	10	000000000	0000
3/4"	0.042"	5/64"	Not Rated	5	000000000	0000
10-32
1/8"	0.046"	3/32"	Not Rated	10	000000000	0000
3/16"	0.046"	3/32"	Not Rated	10	000000000	0000
1/4"	0.046"	3/32"	Not Rated	10	000000000	0000
3/8"	0.046"	3/32"	Not Rated	5	000000000	0000
1/2"	0.046"	3/32"	Not Rated	5	000000000	0000
3/4"	0.046"	3/32"	Not Rated	5	000000000	0000
1"	0.046"	3/32"	Not Rated	5	000000000	0000
1/4"-20
1/4"	0.062"	1/8"	Not Rated	5	000000000	0000
3/8"	0.062"	1/8"	Not Rated	5	000000000	0000
1/2"	0.062"	1/8"	Not Rated	5	000000000	0000
3/4"	0.062"	1/8"	Not Rated	5	000000000	0000
1"	0.062"	1/8"	Not Rated	5	000000000	0000
5/16"-18
3/8"	0.078"	5/32"	Not Rated	5	000000000	0000
1/2"	0.078"	5/32"	Not Rated	5	000000000	0000
3/4"	0.078"	5/32"	Not Rated	5	000000000	0000
3/8"-16
3/8"	0.093"	3/16"	Not Rated	5	000000000	0000
1/2"	0.093"	3/16"	Not Rated	5	000000000	0000
3/4"	0.093"	3/16"	Not Rated	5	000000000	0000
1"	0.093"	3/16"	Not Rated	5	000000000	0000

Metric Vented Cup-Point Set Screws

Vented to allow fluid and gas to pass through. A cup point with a thin edge digs into the contact surface for a secure hold. Made from 18-8 stainless steel, these set screws are chemical resistant and may be mildly magnetic. Length listed is the overall length.

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

18-8 Stainless Steel
Lg., mm	Vent Dia., mm	Drive Size, mm	Hardness	Pkg. Qty.		Pkg.
M2.5 × 0.45 mm
4	1	1.3	Not Rated	5	000000000	00000
5	1	1.3	Not Rated	5	000000000	0000
M3 × 0.5 mm
4	1.1	1.5	Not Rated	5	000000000	0000
5	1.1	1.5	Not Rated	5	000000000	0000
6	1.1	1.5	Not Rated	5	000000000	0000
M4 × 0.7 mm
4	1.2	2	Not Rated	5	000000000	0000
5	1.2	2	Not Rated	5	000000000	0000
6	1.2	2	Not Rated	5	000000000	0000
8	1.2	2	Not Rated	5	000000000	0000
M5 × 0.8 mm
5	1.3	2.5	Not Rated	5	000000000	0000
6	1.3	2.5	Not Rated	5	000000000	0000
8	1.3	2.5	Not Rated	5	000000000	0000

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About Socket Head Screws

About Set Screws

Cleaned and Bagged 18-8 Stainless Steel Socket Head Screws for High Vacuum

High-Vacuum Cleaned-and-Bagged Vented Socket Head Screws

Vented Cup-Point Set Screws

Metric Vented Cup-Point Set Screws