Butterfly Screws | McMaster-Carr

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	System of Measurement System of Measurement

	Thread Size Thread Size

	Thread Type Thread Type

	Length Length

	Thumb Screw Head Shape Thumb Screw Head Shape


Wing	Two Arm

	Material Material

Stainless Steel

	Head Type Head Type


Thumb	Rounded

Flat

	Threading Threading

	Fully Threaded
	Partially Threaded

	Anchor Type Anchor Type


Toggle	Stud

Female Threaded	Plug

	Head Diameter Head Diameter

	For Use In For Use In

	Thread Spacing Thread Spacing

	Head Height Head Height

	Head Width Head Width

	Thread Fit Thread Fit

	Screw Size Screw Size

	Thread Pitch Thread Pitch

	Drive Style Drive Style


Slotted	Phillips

	Pull-Out Strength Pull-Out Strength

Less than 100 lbs.

100 to 249 lbs.

250 to 399 lbs.

400 to 499 lbs.

500 lbs. or greater

	Diameter Diameter

	Finish Finish

Zinc Yellow-Chromate Plated

	Usable Length Usable Length

3/8"-2 1/2"

3/8"-3 5/8"

2"-9 1/2"

10-64mm

10-92mm

51-240mm

	Drill Bit Size Drill Bit Size

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About Thumb Screw and Binding Post Materials

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Thumb Screws

Stainless Steel Wing-Head
Thumb Screws

Stainless Steel Wing-Head Thumb Screws

Stainless steel thumb screws have excellent corrosion resistance in most environments.

Steel and Iron Wing-Head
Thumb Screws

Steel and Iron Wing-Head Thumb Screws

Wings provide more leverage than spade-head thumb screws for greater torque while tightening. A zinc plating provides corrosion resistance in wet environments.

Metric Iron Wing-Head Thumb Screws

Metric Iron Wing-Head Thumb Screws

These metric thumb screws have wings that provide more leverage than spade-head thumb screws for greater torque while tightening. A zinc plating provides corrosion resistance in wet environments.

Two-Arm Plastic-Head Thumb Screws

Two-Arm Plastic-Head Thumb Screws

Arms provide a flat surface to push your fingers against.

Anchors

Rounded Head Toggle Bolts

A spring-loaded toggle holds against the back of the material.

Toggles for Toggle Bolts

Flat Head Toggle Bolts

Flat Head Toggle Bolts

Bolts are beveled under the head for use in countersunk holes.

Low-Profile Rounded
Head Toggle Bolts

A shallow head makes these bolts good for low-clearance applications.

Nylon Drilling Toggle Bolts

Nylon Drilling Toggle Bolts

Zinc Alloy Drilling Toggle Bolts

High-Strength Toggle Anchors

High-strength toggle anchors provide an extremely strong hold and stay in position when a bolt is removed.

Toggle Anchors for Sheet
Metal and Wood Screws

These anchors fit a range of sheet metal and wood screw sizes since they form their own threads when installed.

Stud-Style Anchors for
Hollow Block and Brick

These stud-style anchors include a nut and a washer.

Female-Threaded Toggle Anchors
for Hollow Block and Brick

Female-Threaded Toggle Anchors for Hollow Block and Brick

A pivoting toggle bar creates a strong hold.

Toggle Bolt Anchor Assortments for
Drywall, Plaster, and Wood Paneling

Toggle Bolt Anchor Assortments for
Drywall, Plaster, and Wood Paneling

Toggle Bolt Anchor Assortments for Drywall, Plaster, and Wood Paneling

A wing-like toggle holds against the back of the material and spreads the force over a large area to hold 30 lbs. or more.

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