1/4" Lags | McMaster-Carr

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	System of Measurement System of Measurement

Inch

	Screw Size Screw Size	Show

1/4"

	Screw Size Screw Size	Hide

	Length Length

	Head Type Head Type

	Hex		Eye

	Finish Finish

Zinc Plated

Black Oxide

Hot-Dipped Galvanized

Black Zinc Plated

Zinc Yellow-Chromate Plated

	Material Material

Stainless Steel

Steel

Zinc

	For Use In For Use In

	Threading Threading

	Partially Threaded
	Fully Threaded
	Threaded on Both Ends

	Minimum Thread Length Minimum Thread Length

	Head Width Head Width

	Head Height Head Height

	Approximate Threads per Inch Approximate Threads per Inch

	Specifications Met Specifications Met

ASME

ASTM

SAE

	Thread Size Thread Size

1/4"-20

	Thread Type Thread Type

UNC

	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

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

DFARS Specialty Metals
COTS-Exempt

	Flange Diameter Flange Diameter

0.56"

0.66"

	Thread Fit Thread Fit

Class 1A

Class 2A

Class 2B

	Anchor Type Anchor Type

	Female Threaded

	Hardness Hardness

Rockwell B80

Not Rated

	Diameter Diameter

1/2"

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About Tapping Screws

Steel Hex Head Screws for Wood

These steel screws have corrosion-resistant finishes.

18-8 Stainless Steel Hex Head Screws for Wood

18-8 stainless steel screws have good chemical resistance.

Super-Corrosion-Resistant 316 Stainless
Steel Hex Head Screws for Wood

More corrosion resistant than 18-8 stainless steel screws, these have excellent resistance to chemicals and salt water.

Steel Flanged Hex Head Screws for Wood

These steel screws are hot-dipped galvanized to resist corrosion in wet environments.

Stainless Steel Flanged Hex Head Screws for Wood

These 316 stainless steel screws have excellent resistance to chemicals and salt water.

Wood Screw-Style Hangers

Drive these hangers into wood with an adjustable wrench, pliers, or a special driver bit.

Steel Wood Screw Threaded Studs

These studs are also known as hanger bolts—use them to hang, mount, and fasten parts to wood structures.

Stainless Steel Wood Screw Threaded Studs

18-8 stainless steel studs have good chemical resistance and may be mildly magnetic. Also known as hanger bolts, use them to hang, mount, and fasten parts to wood structures.

Wood-to-Wood Joining Studs

Also known as dowel screws, use these to join two pieces of wood.

Vibration-Resistant Female-Threaded
Anchors for Block and Brick

Often referred to as four-way expansion anchors, these expand in four directions to resist loosening from vibration.

Female-Threaded Anchors for Block and Brick

Also known as double expansion anchors, these expand from both sides for full contact and a secure hold.

Female-Threaded Expansion
Anchors for Hollow Block and Brick

For narrow holes and small cavities where toggle anchors won't fit.