M3.5 Reducers | McMaster-Carr

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118 Products

Thread Adapters

Metric-to-Metric Male-Female Hex Thread Adapters

In addition to joining male- and female-threaded parts, these adapters can increase or decrease metric thread sizes and change the thread pitch.

Inch-to-Metric Male-Female Hex Thread Adapters

Change inch threads to metric with these adapters, or swap metric threads for inch. An external hex lets you tighten or loosen them with a wrench.

Metric-to-Metric Male Hex Thread Adapters

Twist these adapters onto female metric threads to change pitch or switch thread sizes.

Inch-to-Metric Female Hex Thread Adapters

Adapt threaded rods from inch to metric. These adapters connect two male-threaded fasteners, so you can change the gender of a mating part or increase or decrease its thread size. The hex-shaped body fits into the head of a standard wrench.

Metric-to-Metric Female Hex Thread Adapters

Increase or decrease metric thread size from one male-threaded part to another. Commonly used to connect two differently sized threaded rods, they have a hex-shaped body, so you can tighten them with a standard wrench.

Threaded Inserts for Metal

Stainless Steel Helical Inserts

Stainless Steel Screw-Locking Helical Inserts

A distorted thread grips the screw to resist loosening.

Tapping Inserts for Soft Metal

These inserts cut their own threads in soft metals such as aluminum, so there's no need to tap the hole. Also known as Tap-Lok inserts.

Press-Fit Inserts for Soft Metal

Push these inserts into untapped holes to add threads in aluminum and other soft metal.

Tapping Insert Assortments for Soft Metal

Cut a variety of thread sizes into aluminum and other soft metal—no taps required.

Threaded Inserts for Plastic

18-8 Stainless Steel Twist-Resistant
Hex-Shaped Inserts for Plastic

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

Aluminum Twist-Resistant
Hex-Shaped Inserts for Plastic

70% lighter than stainless steel, these aluminum inserts are mildly corrosion resistant and nonmagnetic.

Brass Screw-to-Expand Inserts for Plastic

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

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 to create a straight hole, then taper the top half.

Tapered Heat-Set Insert Assortments
for Plastic with Installation Tools

Assortments include various sizes of inserts, a soldering iron, a ceramic insulation tube, and installation tips.

Male Threaded Heat-Set Inserts for Plastic

With the male threaded end on these inserts, mount components directly to plastic parts.

Heat-Set Inserts for Plastic

Install these inserts into plastic parts to create a secure base for fasteners.

Symmetrical Heat-Set Inserts for Plastic

Quicker to install than standard heat-set inserts, these inserts go in either way—no need to check which end is correct.

Tapping Inserts for Plastic

To handle greater pull force than press-fit inserts, these tapping inserts have external threads that bite into your material. They’re also known as Trisert inserts.

Mold-In Inserts for Plastic

Integrate strong metal threads as you make parts through injection molding. These inserts become inseparable from your parts, forming a stronger bond in plastic than heat-set inserts and press-fit inserts.

Thread Adapters

Metric-to-Metric Male-Female Hex Thread Adapters

Inch-to-Metric Male-Female Hex Thread Adapters

Metric-to-Metric Male Hex Thread Adapters

Inch-to-Metric Female Hex Thread Adapters

Metric-to-Metric Female Hex Thread Adapters

Threaded Inserts for Metal

Stainless Steel Helical Inserts

Stainless Steel Screw-Locking Helical Inserts

Tapping Inserts for Soft Metal

Press-Fit Inserts for Soft Metal

Tapping Insert Assortments for Soft Metal

Threaded Inserts for Plastic

18-8 Stainless Steel Twist-ResistantHex-Shaped Inserts for Plastic

Aluminum Twist-ResistantHex-Shaped Inserts for Plastic

Brass Screw-to-Expand Inserts for Plastic

Tapered Heat-Set Inserts for Plastic

Tapered Heat-Set Insert Assortmentsfor Plastic with Installation Tools

Male Threaded Heat-Set Inserts for Plastic

Heat-Set Inserts for Plastic

Symmetrical Heat-Set Inserts for Plastic

Tapping Inserts for Plastic

Mold-In Inserts for Plastic

18-8 Stainless Steel Twist-Resistant
Hex-Shaped Inserts for Plastic

Aluminum Twist-Resistant
Hex-Shaped Inserts for Plastic

Tapered Heat-Set Insert Assortments
for Plastic with Installation Tools