McMaster-Carr

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	System of Measurement System of Measurement

Inch

	Thread Size Thread Size	Show

1/4"-28

	Thread Size Thread Size	Hide

	Thread Type Thread Type

UNF

UNJ/UNJF (SAE)

	Threaded Insert Type Threaded Insert Type


Heat Set	Key Locking

Tapping	Thread Locking

Helical

	Installed Length Installed Length

	For Tap Thread Size For Tap Thread Size

	Material Material

	For Use In For Use In

Hardwood

Metal

Plastic

	Specifications Met Specifications Met

Mil. Spec.

NAS

	Thread Direction Thread Direction


Right Hand	Left Hand

	Thread Spacing Thread Spacing

Fine

	Key-Locking Insert Wall Style Key-Locking Insert Wall Style

Thin

Thick

Extra Thick

	For Maximum Hole Diameter For Maximum Hole Diameter

	For Tap Type For Tap Type

Standard (UN)

Helical

	End Type End Type

Open

Closed

	Drill Bit Size Drill Bit Size

	Thread Fit Thread Fit

	Tensile Strength Tensile Strength

	External Locking Type External Locking Type

Key

Thread Locker

	Passivation Passivation

Not Passivated

Passivated

	Number of Inserts Included Number of Inserts Included

	Helical Insert Style Helical Insert Style

With Prong

	Number of Locking Keys Number of Locking Keys

	2		4

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117 Products

Threaded Inserts

Tapered Heat-Set Inserts for Plastic

The tapered shape makes it easier to guide these inserts into a hole during installation. Use a drill bit and reamer to create a tapered hole.

Heat-Set Inserts for Plastic

Key-Locking Inserts for Soft Metal

Drive the keys into the surrounding material for a more secure hold than thread-locking inserts. Install with a standard tap.

Easy-to-Install Thread-Locking
Inserts for Metal

Also known as E-Z Lok inserts, these inserts use adhesive to keep them in place. Install with a standard tap.

Helical Inserts for Metal

Wound like springs, the coil of these inserts expands once installed to securely anchor the insert.

Brass Tapping Inserts for Hardwood

Made from brass, these inserts are nonmagnetic, mildly corrosion resistant, and electrically conductive.

Stainless Steel Tapping
Inserts for Hardwood

These 18-8 stainless steel inserts have excellent resistance to chemicals and may be mildly magnetic.

Other Inserts

Press-Fit Nuts

Also known as clinch nuts, press these nuts into thin materials with an arbor press or similar pressure tool.

Rivet Nuts

Also known as blind inserts, rivet nuts can be installed in thin material when you have access to only one side.

Surface-Mount Nuts

Weld, glue, or screw these nuts onto thin materials.

Socket Nuts

Also known as Allen nuts, use these nuts with socket head cap screws in recessed holes and tight spaces that don't have enough clearance for a wrench.

Tube-End Nuts

Connect threaded parts to steel tubes.

Leveling Mounts

Use these mounts to level the supports or legs of equipment and raise equipment off the floor for easier cleaning and inspection.

Vibration-Damping Leveling Mounts

In addition to leveling, these mounts minimize noise and vibration, prolonging machine life.

Threaded-Stud Bumpers

Twist these bumpers into a threaded hole. Often used as feet, spacers, and vibration dampers, they absorb shock to prevent damage to equipment and surfaces.

Threaded Bumpers

Mount these bumpers on a threaded stud. All are reinforced with a steel core or base plate for strength. Often used as feet, spacers, and vibration dampers, they absorb shock to prevent damage to equipment and surfaces. They're also good for starting and stopping motion on automated machines.

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