Knock-In Inserts | McMaster-Carr

	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

	Installed Length Installed Length

	For Use In For Use In

Softwood

Hardwood

Fiberglass

	Material Material

Zinc

Steel

Stainless Steel

	Finish Finish

Zinc Plated

Black Oxide

	Flange Diameter Flange Diameter

	Barrel Length Barrel Length

	For Minimum Material Thickness For Minimum Material Thickness

	Drill Bit Size Drill Bit Size

	Number of Prongs Number of Prongs

	Barrel Diameter Barrel Diameter

	Flange Thickness Flange Thickness

	For Maximum Hole Diameter For Maximum Hole Diameter

	End Type End Type

Open

Closed

	Tensile Strength Tensile Strength

	Thread Type Thread Type

UNC

UNF

Metric

	Thread Spacing Thread Spacing

Coarse

Fine

	Thread Fit Thread Fit

Class 2B

Class 6H

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

REACH Compliant

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

RoHS Compliant

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

DFARS Specialty Metals
COTS-Exempt

	Prong Length Prong Length

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209 Products

Hammer-In Inserts for Wood

Flanged Barbed Inserts for Softwood

An open end allows long screws and bolts to pass through the insert.

Closed-End Flanged Barbed Inserts for Softwood

A closed end seals out elements and protects the threads on these inserts from debris.

Flush-Mount Barbed Inserts for Softwood

Mount these inserts flush or below the material's surface.

Knurled Inserts for Hardwood

Knurls hold these inserts in hardwoods such as oak, maple, and walnut to prevent twisting.

Hammer-In Tee Nut Inserts for Wood

Steel Tee Nut Inserts for Wood

Steel inserts have high strength for durability.

18-8 Stainless Steel Tee Nut Inserts for Wood

These 18-8 stainless steel tee nut inserts have better corrosion resistance than zinc-plated steel tee nut inserts.

316 Stainless Steel Tee Nut Inserts for Wood

The most corrosion resistant tee nut inserts we offer, these inserts stand up to chemicals and salt water.

Split-Resistant Tee Nut Inserts for Hardwood

Fewer prongs than other tee nut inserts reduce the risk of splitting hardwood—these inserts have three short prongs.

Ultra-Split-Resistant Tee Nut Inserts for Hardwood

Ridges on the barrel of these inserts make them less likely to split hardwood than inserts with prongs. They're often used in wood that has been cut across the growth rings.

Twist-Resistant Tee Nut Inserts for Softwood

Six prongs around the barrel of these inserts provide a strong hold and prevent them from loosening and twisting.

Secure-Grip Tee Nut Inserts for Softwood

Hooked prongs give these inserts excellent holding power even when removing screws.

Screw-Locking Tee Nut Inserts for Wood

Use where vibration is a concern—these tee nut inserts have distorted threads that lock screws in place.

Tee Nut Inserts for Fiberglass

A wide flange distributes the load over a large area. Hammer these inserts into a drilled hole.