Bleeder Screws | McMaster-Carr

	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

	Thread Type Thread Type

UNC

UNF

Metric

	Length Length

	Head Type Head Type


Socket	Hex

Rounded	Headless

Flat

	Size Size

	Drive Style Drive Style


Hex	External Hex

	Vent Diameter Vent Diameter

	Threading Threading

	Fully Threaded
	Partially Threaded

	Hardness Hardness

Rockwell B70

Rockwell B81

Not Rated

	Thread Fit Thread Fit

	Thread Spacing Thread Spacing

Coarse

Fine

	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

	Head Diameter Head Diameter

	Thread Pitch Thread Pitch

	Head Height Head Height

	Head Width Head Width

	Tensile Strength Tensile Strength

70,000 psi

80,000 psi

Not Rated

	Specifications Met Specifications Met

	Countersink Angle Countersink Angle

82°

90°

	Minimum Thread Length Minimum Thread Length

	Environmental Rating Environmental Rating

309 Products

Screws and Bolts

Vented Socket Head Screws

Drilled through the head and shaft, these screws vent fluid and gases trapped below the screw, making them good for vacuum applications.

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

Fasten these screws inside a high-vacuum system without bringing in contaminants.

Vented Hex Head Screws

Drilled through the head and shaft, these screws vent fluid and gases trapped below the screw, making them good for vacuum applications.

Vented Button Head Screws

These screws are drilled through the shaft to vent fluids and gases trapped under the screw. Made from 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic.

Metric Vented Button Head Screws

To vent fluid and gas trapped under the screw, these metric screws are drilled through the shaft. Made from 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic.

Vented Cup-Point Set Screws

These inch size set screws are vented to allow fluid and gas to pass through.

Metric Vented Cup-Point Set Screws

These metric set screws are vented to allow fluid and gas to pass through.

Vented Flat Head Screws

These screws are drilled through the shaft to vent fluids and gases trapped under the screw.

Metric Vented Flat Head Screws

To vent fluids and gases trapped under the screw, these metric screws are drilled through the shaft.

Screws and Bolts

Vented Socket Head Screws

High-Vacuum Cleaned-and-BaggedVented Socket Head Screws

Vented Hex Head Screws

Vented Button Head Screws

Metric Vented Button Head Screws

Vented Cup-Point Set Screws

Metric Vented Cup-Point Set Screws

Vented Flat Head Screws

Metric Vented Flat Head Screws

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