2-56 Reducers | McMaster-Carr

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DFARS Specialty Metals

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182 Products

Thread Adapters

Inch-to-Inch Male-Female Hex Thread Adapters

Change thread sizes or types, such as fine to coarse threads, on parts without changing gender.

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.

Inch-to-Inch Male Hex Thread Adapters

Need to join two female-threaded parts, such as coupling nuts, with dissimilar inch thread sizes? Attach them to these adapters and tighten the exterior hex nut for a secure connection.

Inch-to-Inch Female Hex Thread Adapters

Connect two differently sized male-threaded parts, such as threaded rods, and tighten with a standard wrench.

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.

Helical Inserts for Metal

Stainless Steel Helical Inserts

Lubricated Stainless Steel Helical Inserts

A dry film keeps the screw from sticking or binding in these inserts during installation.

Lubricated Stainless Steel Helical
Inserts for Dissimilar Metals

Eliminating the need for primer, these inserts are coated to resist corrosion when installed in different materials.

Stainless Steel Helical Inserts
for Particle-Free Environments

Made of Nitronic 60 stainless steel, these inserts prevent the screw from binding or sticking without any coating or lubricant that could contaminate particle-free environments.

Nickel Alloy Helical Inserts

Made of nickel alloy, these inserts are more resistant to acids and salt water than stainless steel inserts.

Stainless Steel Screw-Locking Helical Inserts

A distorted thread grips the screw to resist loosening.

Stainless Steel Screw-Locking Helical
Inserts for Particle-Free Environments

Made of Nitronic 60 stainless steel, these inserts prevent the screw from binding or sticking without any coating or lubricant that could contaminate particle-free environments.

Lubricated Stainless Steel
Screw-Locking Helical Inserts

A dry film keeps the screw from sticking or binding in these inserts during installation.

Stainless Steel Helical Inserts without Prong

Without a prong to break off and retrieve, these inserts are often used where debris could cause damage.

Lubricated Stainless Steel
Helical Inserts without Prong

A dry film keeps the screw from sticking or binding in these inserts during installation.

Screw-Locking Helical Inserts without Prong

A distorted thread grips the screw to resist loosening.

Helical Insert Assortments with Installation Tools

Assortments include various sizes of helical inserts and a tap, a drill bit, and an installation tool for each thread size.

Helical Inserts with Installation Tools

Inserts come with a through-hole tap and installation tool.

Key-Locking Inserts for Soft Metal

18-8 Stainless Steel Key-Locking Inserts

Made of 18-8 stainless steel, these inserts have good corrosion resistance.

Mil. Spec. Stainless Steel Key-Locking Inserts

These inserts are made to stringent military specifications.

Mil. Spec. Alloy Steel Key-Locking Inserts

The strongest key-locking inserts we offer, these inserts are made to stringent military specifications.

Aligning Key-Locking Inserts

Install threads that align with off-center parts. These inserts have floating threads that account for misalignment, allowing you to insert screws at a slight angle as you fasten two parts together.

Closed-End Key-Locking Inserts

Protect threads from debris and leaks—these inserts have a closed end as a barrier.

High-Strength A286 Stainless
Steel Key-Locking Inserts

The strongest and most corrosion-resistant stainless steel key-locking inserts we offer. Made of A286 stainless steel, these inserts stand up to salt water, harsh chemicals, and even high temperatures.

Screw-Locking Key-Locking Inserts

Forming the strongest hold of any of our threaded inserts, these inserts have a distorted internal thread to lock screws into place and keys that drive into surrounding material to prevent slipping and rotating.

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.

Press-Fit 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.

Barbed Inserts for Plastic

The barbed sides keep these securely in place even before a screw is installed.

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.

Aluminum Screw-to-Expand Inserts for Plastic

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.

Brass Screw-to-Expand Inserts for Plastic

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

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.

Heat-Set Inserts for Plastic

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.

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

Inch-to-Inch Male-Female Hex Thread Adapters

Inch-to-Metric Male-Female Hex Thread Adapters

Inch-to-Inch Male Hex Thread Adapters

Inch-to-Inch Female Hex Thread Adapters

Inch-to-Metric Female Hex Thread Adapters

Helical Inserts for Metal

Stainless Steel Helical Inserts

Lubricated Stainless Steel Helical Inserts

Lubricated Stainless Steel HelicalInserts for Dissimilar Metals

Stainless Steel Helical Insertsfor Particle-Free Environments

Nickel Alloy Helical Inserts

Stainless Steel Screw-Locking Helical Inserts

Stainless Steel Screw-Locking HelicalInserts for Particle-Free Environments

Lubricated Stainless SteelScrew-Locking Helical Inserts

Stainless Steel Helical Inserts without Prong

Lubricated Stainless SteelHelical Inserts without Prong

Screw-Locking Helical Inserts without Prong

Helical Insert Assortments with Installation Tools

Helical Inserts with Installation Tools

Key-Locking Inserts for Soft Metal

18-8 Stainless Steel Key-Locking Inserts

Mil. Spec. Stainless Steel Key-Locking Inserts

Mil. Spec. Alloy Steel Key-Locking Inserts

Aligning Key-Locking Inserts

Closed-End Key-Locking Inserts

High-Strength A286 StainlessSteel Key-Locking Inserts