Expansion Inserts | McMaster-Carr

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208 Products

About Threaded Inserts

Choose the right threaded insert for your application and learn how to install it securely.

Screw-to-Expand Inserts for Plastic

Brass Flanged Screw-to-Expand Inserts for Plastic

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

18-8 Stainless Steel Flanged
Screw-to-Expand Inserts for Plastic

These 18-8 stainless steel inserts have better corrosion resistance than brass inserts and may be mildly magnetic.

Aluminum Flanged
Screw-to-Expand Inserts for Plastic

These aluminum inserts are 70% lighter than brass inserts, electrically conductive, and nonmagnetic. They have good corrosion resistance, which is comparable to brass but not as good as stainless steel.

Brass Screw-to-Expand Inserts for Plastic

Made from brass, these inserts are electrically conductive, nonmagnetic, and have good corrosion resistance.

18-8 Stainless Steel
Screw-to-Expand Inserts for Plastic

These 18-8 stainless steel inserts have better corrosion resistance than brass inserts and may be mildly magnetic.

Aluminum Screw-to-Expand Inserts for Plastic

Pull-Out Resistant
Screw-to-Expand Inserts for Plastic

Fins cut into the surrounding material for a more secure hold than knurled inserts. Made from brass, they’re nonmagnetic, corrosion resistant, and electrically conductive.

Brass Screw-to-Expand Inserts
for Through Holes in Plastic

The flange keeps these inserts from pulling through a hole. Press them in from the underside of material, and install a screw from the top of material.

18-8 Stainless Steel Screw-to-Expand
Inserts for Through Holes in Plastic

Made of 18-8 stainless steel, these inserts are stronger than brass inserts and less likely to corrode from mild chemicals and water. Install them into plastic to add durable threads.

Push-to-Expand Inserts for Plastic

Push down on the inside of these inserts with an installation tool and they expand to hold firm in surrounding material.

Fire-Stop Electrical Box Inserts

Seal electrical boxes to maintain fire-resistant walls. These inserts mount inside electrical boxes to block the spread of smoke and flames.

Screw-to-Expand Inserts for Plastic

Brass Flanged Screw-to-Expand Inserts for Plastic

18-8 Stainless Steel FlangedScrew-to-Expand Inserts for Plastic

Aluminum FlangedScrew-to-Expand Inserts for Plastic

Brass Screw-to-Expand Inserts for Plastic

18-8 Stainless SteelScrew-to-Expand Inserts for Plastic

Aluminum Screw-to-Expand Inserts for Plastic

Pull-Out ResistantScrew-to-Expand Inserts for Plastic

Brass Screw-to-Expand Insertsfor Through Holes in Plastic

18-8 Stainless Steel Screw-to-ExpandInserts for Through Holes in Plastic

Push-to-Expand Inserts for Plastic

Push-to-Expand Inserts for Plastic

Fire-Stop Electrical Box Inserts

Fire-Stop Electrical Box Inserts

18-8 Stainless Steel Flanged
Screw-to-Expand Inserts for Plastic

Aluminum Flanged
Screw-to-Expand Inserts for Plastic

18-8 Stainless Steel
Screw-to-Expand Inserts for Plastic

Pull-Out Resistant
Screw-to-Expand Inserts for Plastic

Brass Screw-to-Expand Inserts
for Through Holes in Plastic

18-8 Stainless Steel Screw-to-Expand
Inserts for Through Holes in Plastic