Insert Nut

Insert Nut

This provides a threaded socket for a wooden workpiece, just as similar to a wall anchor. These are located into a pre-drilled hole by one of two means: screw-in and hammer in.  Which are advantageous over T-nuts and barrel nuts, due to they can be installed from one side of the workpiece.

Screw-in type

Mainly these types of insert nuts possess an external thread and hex head and are screwed in with a Flat Blade Screwdriver or an Allen wrench. The screw-in insert nuts come in multiple sizes and take different screw sizes. Take an example, of a “1/4-20” insert nut, will take a 1/4-20 inch bolt. The pre-drilled hole must be as intense as the length of the insert nut plus any portion of the bolt that may be screwed past the end of the nut in the workpiece.

Hammer-in type

This type of insert nuts, usually known as knock-in nuts, are lined with barbs and are hammered in. They are generally assembled of steel, brass or nylon. They are constructed to work in wood and particleboard.

Not all nuts attribute a traditional hexagonal shape. Whereas hexagonal nuts are popular because they are easier to turn — and therefore to install — than other shapes, but that doesn’t mean all nuts are hexagonal. Insert nuts, by taking an example, feature a cylindrical shape with exterior threading. In the below-shown image to the left, they share little or no resemblance to hexagonal nuts.

Overview of Insert Nuts

An insert nut is an altogether different variant of fastener consisting of a hollow interior which is utilized to support a bolt. Which features both internal, as well as external, threading. The exterior threading makes possible the insert nut to be “inserted” inside an object or workpiece, whereas the internal threading gives way to a bolt to be driven into the insert nut.

How Insert Nuts Work?

Insert nuts work like a similar way as wall anchors by generating a backbone (support system) for a different fastener, such as a bolt. Comparatively than driving a bolt directly into an object, an insert nut is added into the object. Into the bolt the insert nut the bolt is driven.

The purpose of insert nuts is to create a stable and secure grasp with the bolt.  Certainly in objects, specifically of those made of wood, bolts may gently pull out over time. Insert nuts restrain this from occurring by grasping into the object. The exterior threading will grip into the object during the introduction. Once in order, a bolt can then be operated into the insert nut’s interior threading.

Screw-In vs Hammer-In Insert Nuts

There are essentially two basic types of insert nuts: screw-in and hammer-in. Screw-in insert nuts live up to their equivalent by being “screwed” into an object, whereas hammer-in insert nuts are hammered” into an object. Screw-in insert nuts are often favored due to they are less likely to damage the object in which they are inserted. However, both screw-in and hammer-in insert nuts can be utilized to assist a bolt. The only variant between them is that they are installed in different ways.

In Conclusion

Screw-in nuts are frequently used in the construction of wooden furniture. They feature internal and external threading, the previous of which supports a bolt. Insert nuts are driven or inserted into an object, at which location a bolt is driven into their hollow, threaded interior.

Type I Insert Nuts for Wood contains outer teeth that provide a strong, permanent thread for wood and wood-based materials, providing substantial holding power even when torqued laterally.

The rough external barb pattern ensures a maximum holding power and helps to simplify fixture by knocking the insert into the base material.

This insert nut has a blind – or closed – round surface flange which is pressed or hammered into position through a pre-drilled pilot hole. Once it is in an attached position, a ‘joint connector bolt‘ can be installed from the adjoining side and screwed into position – mating the insert nut to provide a strong attaching force, increasing its holding power and producing a beautifully pleasing finished appearance.

Due to the installation of various clamping or adjustment knobs shop fixtures and jigs often require.

Being primarily available in measurements from #8-32 (a #8 screw body with 32 threads per inch) to 3⁄8 “-16 (a 3⁄8 ” screw body with 16 threads per inch), there are two primary types of threaded inserts: thread-in and press-in.

Usage of thread-in inserts in softer woods and plywood where their rough exterior threads cut easily into the surrounding wood. Easily drill a hole sized for the body of the insert, and screw it into the proper location. In very hardwoods, such as white oak and maple, or when the insert is close to the boundary of a part and screwing it in may split the wood, drill a hole slightly bigger than the outside thread diameter, and epoxy the insert in place. To protect the internal threads from epoxy, cover the end of the insert.

Press-in inserts, with their barbed exteriors, work efficiently in hardwoods, softwoods, and plywood. Drill a hole sized for the body of the insert, and press it into place with a clamp or tap it in with a hammer and a block of wood. For use in appliances in which the clamping action tends to pull the insert out of the wood, such as the knobs that tighten down on a drill-press fence extension, drill a hole that engages just the tips of the insert barbs and epoxy it in place.
Threaded fasteners are often used in partnership with a threaded insert to join two or more objects. The threaded bushings, they provided female threaded to support the use of a fastener with male threading, such as a screw or bolt.

Reasons to Use a Threaded Insert

Threaded inserts are routinely used when the article in which a threaded fastener is being situated is made of a soft material. For stiff materials, a screw or bolt can be frequently driven into the article without the need for a threaded insert. For soft materials, nonetheless, driving a screw or bolt straight into the object, can destroy it.

If the pole of a threaded hole has deteriorated to the point where they no longer support or hold a threaded fastener, a threaded insert can be utilized

Some of the threaded inserts may extent out the back of the object, but a screw or bolt can still be driven all the way into it.

The Different Types of Threaded Inserts 

All threaded inserts are designed with female threading to support the use of a fastener with male threading, but there are several different types of threaded inserts, each of which features a unique design. Helical threaded inserts, for example, are characterized by a coiled design, typically consisting of steel or bronze.

Also known as cage nuts, they feature “wings” on the top that dig into the object when a threaded fastener is driven into them. Captive nuts have been around for over a half-century, with the first patent being granted in 1946.

They still have internal threading, but they also contain outer threading. So, what’s the purpose of this external threading. Whereas external threading can be operated into pre-drilled holes with huge ease.

What Are Well Nuts?

A Well Nut is a detachable rivet nut constructed of two parts. Well, nuts only need one side of the hole to be visible so they can be utilized for blind fastenings.

How Do Well Nuts Work?

A well nut, also mainly known as rubout, rubber nut or raw nut, is a fastener utilized when something needs to be connected to a surface (in most cases where only one side is made available).

Installing well nuts is a simple task:

1. A hole must be drilled into the installation material. The hole will need to be according to the measurement of the rubber portion of the insert.

2. Then slide the insert into the hole so that the flange is the only portion of the nut exposed. During this point, a hole must be drilled into the material you wish to stick if it has not been drilled already.

3. Slide a washer onto the machine screw. You require to utilize a washer to press down on the border portion of the well nut. Under other conditions, the well nut will try to spin during installation.

4. Put in order up the two holes and insert a machine screw that matches the threading of the well nut.

5. Start driving the machine screw (and washer) into the threads. As the well nut tightens, the rubber portion will start to deform and pull against the back of the installation surface forming a tight stronghold.

Are Well Nuts Waterproof?

One of the most basic questions relating to well nuts is “are they waterproof?” Yes, well nuts are examined to be a waterproof fastener but it is more precise to call them waterproof. Well, nuts create a water-resistant hole by tightly pressing the deformed rubber over and into the hole to completely seal it.

There are various ways in which they will not produce a waterproof seal:

• If the Rubber on the nut dries out
o Rubber will eventually dry out causing cracks in the nut. This can cause leaks and will eventually need to be replaced. Time to replacement will vary but saltwater environments may decrease the life of the rubber.
• If the nut becomes immersed in huge depths
o Even though these nuts are contemplated to be waterproof, after a certain depth the pressure buildup on the fastener may cause the rubber to deform further and break up its seal on the hole.
• If the screw loosen or break up on the nut
o Screws can break up over time due to accidental shocks and vibrations. If the screw begins to break up, the rubber will start to retake its original shape and break the seal on the hole. We recommend using a thread locker solution when installing fasteners to prevent accidental loosening.

What Are Well Nuts Used For?

Well, nuts are mostly prized for their water-resistant, marine grade and blind fastening properties but can be used in many different situations. These blind insert rivet nuts can be used to deter vibrations and shocks in machinery. They are also quite common in compressors and mirrors for similar reasons.

Well, nuts also provide a unique quality most fasteners do not. They can act as an insulator between two materials to prevent galvanic corrosion from occurring.

Well, Nuts Vs. Rivnuts
Well, nut benefits:
• Water-Resistant
• Marine Grade
• Blind Fastening
• Deter Negative Effects Of Vibrations and Shocks
• Easily Replaceable

Rivnut Benefits:
• Many Different Materials
• Blind Fastening
• Significantly Stronger Pull-Out Strength
*Pro Tip: While well nuts are an excellent and versatile fastener, their grip is almost exclusively based on the deformed rubber forming a holdover and inside of a hole. Due to this, well nuts have a weaker pull-out strength than many other fasteners and this consideration should be weighed when preparing for installation.

Threaded Inserts

Thread Inserts in numerous ways finishes & sizes for enlarge Fastener holding power.

Thread inserts also known as insert nuts, which consist of outer knife threads that provide superior holding power in hard and softwoods, particleboard and all wood products. They are installed into the material and hold in place. The inside of thread insert nuts has threading made of metal to create a more durable hold. Utilized everywhere in fields assembly or disassembly could lead to thread erosion. The long pilot makes sure straight driving into a drilled hole. It can be installed with a screwdriver, bolt and nut, tapping head, or EZ LOK driving tool.

Stainless steel threaded inserts are obtainable in rough and fine threads. Not similar to coil inserts, which need a special drill, tap, and installation tool, E-Z LOK threaded inserts for metal are installed using standard tools. Simply drill the properly sized hole with a standard drill, tap the hole with a standard tap and then turn in the E-Z LOK like an ordinary fastener with a screwdriver, bolt and jam nut, or an E-Z LOK drive tool.

Threaded Inserts For Wood

Thread Inserts in solid brass characterizes external knife threads that provide superior holding power in hard and softwoods, particleboard and all wood products. Utilize everywhere field assembly or disassembly which could lead to thread erosion or stripping. The long pilot makes sure straight driving into a drilled hole. Induct with screwdriver, bolt and nut, tapping head, or EZ LOK driving tool.

Brass is an alloy constructed of copper and zinc. The color of brass can differ from dark to light based on the zinc content; more zinc content generates lighter brass. Brass is rewarded for its corrosion-proof; nonetheless, it is quite soft so it is not appropriate for all appliances. Brass regulates the electricity and is also a good conductor of heat. It is frequently utilized in pipes, weather stripping, trim, radiators, musical instruments, and firearms.

Stainless Steel Threaded Inserts

Stainless Steel Threaded Inserts by E-Z Lok are machined out of 303 Stainless Steel and characterize standard OD threads. This makes sure for the utilization of standard taps for installation, no special tools are required.

Stainless Steel Solid wall inserts are commonly used in preservation departments and in tool cribs, as well as in the molding and metalworking industries. Stainless Steel Threaded Inserts are a rapid and simple solution for reinforcing or repairing holes in soft metals.

303 Stainless Steel Inserts are ideal for appliances needing additional corrosion proof, as well as food, beverage, and other clean-critical appliances.

Stainless Steel Helical Threaded Inserts

Helical Inserts are utilized to reinvent, and repair drained holes in soft metals. E-Z Lok Helical Inserts characterizes strong, corrosion-resistant internal threads. Helical Inserts are engineered to resist temperatures up to 800 degrees Fahrenheit.

Helical Inserts are built of 18-8 Stainless Steel wire which is constructed into a diamond pattern for strength and then wound or coiled into a spring shape. Before induction, the diameter of a helical insert will be bigger than the tapped hole, but once properly inducted the insert measurement decreases allowing the helical insert to thread the hole. After induction, E-Z Lok coil inserts will stay firmly in place as the radial pressure of the spring releases.

Stainless Steel Helical Threaded Inserts are perfect for applications requiring additional corrosion proof, as well as automotive, food, beverage, and other clean-critical applications.

Stainless Steel Helicoil Inserts are made available in 18-8 or 304 Stainless Steel.

Top Uses of Insert Nuts

6 Applications for Threaded Inserts

Threaded inserts are some of the most adaptable fasteners ever invented. They can be used in virtually any material to create a strong join that can accept a bolt or screw, they can be constituted of various materials, and they have come into primary use in a wide variety of industries and applications.

What’s a Threaded Insert?

A threaded insert is a sleeve consisting of a threaded interior that can accept a bolt or threaded fastener. The insert can have different proportions, be constituted of different materials, and come in varied arrangements or tooling; it structure will hold fast in thin or soft materials, making the threaded fastener secure.

There are different types of threaded inserts for different types of materials. Most inserts are fitted into predrilled or tapped holes; in fact, they are extremely useful for repairing stripped threaded holes. In the case of soft materials, such as plastic or wood, the threaded insert often has a shaped or ridged body to hold itself in place and prevent it from turning. Once it is inserted through the hole, the insert is prevented by tightening the insert to create a bulb on the blindside to prevent it in location, or by tightening the bolt to draw the insert back into itself to secure it in the hole.

For thinner materials, threaded inserts usually are secured by fall down the sides of the insert on the blindside to prevent it in place with a margin. When inserted through the hole, the body of the insert collapses to create a strong bond that won’t pull in full the material under load.

Matching the Right Threaded Insert to the Material

Because they are so versatile, threaded inserts can be utilized to prevent a wide variety of materials. Here are some basic illustrations:

Plastics: For soft or brittle materials, such as plastics, threaded inserts provide a secure join that can be assembled and disassembled as often as required. For applications such as securing a circuit board or attaching plastic molding, Molly Jack inserts are frequently utilized. Molly Jack inserts are made of a thin, brittle material that collapses on the blind side when tightened. There are various types of threaded inserts for plastic, depending on the type of plastic and the application, including ultrasonic heat-staking inserts, push-in inserts, and molded-inserts.

Wood: Softwoods and composites such as pine and plywood are good candidates for threaded inserts. For wood assemblies, such as furniture, threaded inserts are beneficial to create a firm bond, such as with chair or table legs or other joins. They also are used to reinforce stripped joins. In addition to inserts that accept bolts or fasteners, threaded stud-style inserts are likely secured in the tap hole but are designed to accept a nut.

Fiberglass: Fiberglass presents an innovative problem. For thin sheets of fiberglass, Molly Jack additions are useful, but for thicker fiberglass materials, such as those utilized in boatbuilding, knurled inserts are primarily used to minimize corrosion.

For watertight applications, a wellnut insert may be a better choice. 

Metal: When preventing metal, thick-wall threaded inserts are mainly utilized. These are the most basic types of inserts and come with both ribbed and knurled bodies, as well as smooth bodies in the round, hexagonal, semi-hexagonal, and other varied shapes and sizes.

Aluminum: Due to aluminum can be thin and brittle, slotted-body inserts are often best for this material.

Concrete: During construction using concrete often requires securely connecting steel beams to foundations and similar appliances. For concrete construction, stud-style inserts are primarily used, as well as thick-wall threaded inserts.

A Variety of Industries That Use Threaded Inserts

Once we understand the adaptability of threaded inserts, you can begin to see the possibilities. That’s why threaded inserts have become commonplace for manufacturing, assembly, construction, and repairs. These are just a few of the industries that depend on threaded inserts

• Aerospace and aviation – The first threaded inserts were utilized to prevent deicers to airplane wings.

• Automotive – Inserts are used throughout the car body, including well nuts that utilize rubber bodies to cut vibration and place to secure metal and plastic body parts.

• Boatbuilding – Threaded inserts are used in wooden and fiberglass boats to secure hull and trim, and are constituted of brass, coated steel, and other materials that resist corrosion.

• Furniture – We assess wooden furniture above, but inserts can be utilized to join metal to wood, for plastic joins, and for other types of furniture manufacturing and repairs.

• Appliances – Whether they’re securing a plastic cover or circuit board controls, we can search threaded inserts in many household devices.

• Green energy – Threaded additions are built to last, and they are basically used for green energy applications such as preventing solar panels or constructing windmills.

Any request in which you need to securely join two pieces of material is a likely application for threaded inserts. With so many options, it can be enormous to figure out which threaded insert you need, but an experienced fastener distributor can put forward the appropriate types of inserts and tools for us.

Insert Nuts

• Type A -knock-in, flush-fitting inserts along with barbs structured to give the maximum grasp in timber and board materials.

• Type B – alike to Type A, but have a margin to hold the insert on the surface of the undeveloped.

• Type D – a screw-in, border insert which gives a high resistance to pull-out and vibration.

Both threaded inserts and “tee” nuts allow you to put durably threaded in materials that are either too thin to effectively thread or are too soft to permit repeated assembly and disassembly. Popular in the Ready-To-Assemble furniture (RTA), also usually known as knock-down furniture (KD), flat pack furniture, or kit furniture, both types of hardware are easy to install.

Threaded Inserts

Threaded inserts look like short, thick-walled tubes that have screw threads on the inside and outside. They are installed by drilling a pilot hole and screwing the insert in. Which mostly require the utilization of special piloted drivers, which help prevent slippage.

Generally mentioned to as Type D (flanged) or Type E (flush) insert nuts. Hex Drive also provides sturdy machine threads in softwoods. These hex drives are a reliable solution for any application where assembly or disassembly could lead to thread erosion or stripping.

Hex threaded-inserts characterizes varied external threads that also provide exceptional holding power in materials like pine, composition board, MDF, and plywood.

Hex drive threaded inserts are also obtained with internal thread sizes from #8 to 3/8.


• Inexpensive solution for reinforcing threads in softwoods
• Install with Allen wrench or optional drive tool
• Inch threads available
• Flush and flanged designs available

Mainly utilized for:

• Ready-to-Assemble Furniture
• Drawer Pulls
• Display Cases
• Crating
• End grain in wood-turning for handles and bottle stoppers

Stainless Steel places are structured for operation in hardwoods, like oak, cherry, and maple. Stainless inserts are ideal for use everywhere assembly or disassembly could lead to thread erosion.

For any supplementary corrosion noncompliance, stainless steel threaded inserts are used with 8-32 to 1/4-20 internal threads.


• Superior hardwood holding power
• Sizing variety, inch
• 303 Stainless Steel
• Easily installs with a screwdriver, bolt/jam nut, or optional drive tool

Mainly Used for:

• Furniture
• Cabinetry
• Partitions
• Shipping Containers
• In wood-turning for handles and bottle stoppers

Steel inserts are usually structured for utilization in hardwoods, like oak, cherry, and maple. Steel inserts are perfect for use everywhere in assembly or disassembly which could lead to thread erosion or stripping and extra holding power is necessary.

Steel threaded inserts are used with 10-24 to 3/8 internal threads.

• Superior hardwood holding power
• Sizing variety, inch
• 303 Stainless Steel
• Easily installs with a screwdriver, bolt/jam nut, or optional drive tool

Mainly Utilized for:
• Furniture
• Cabinetry
• Partitions
• Shipping Containers

Brass Threaded Inserts for Hard Wood :

These are produced for use in hardwoods, like oak, cherry, and maple. Brass inserts are perfect for utilization wherever assembly or disassembly could lead to thread erosion or stripping. Also, brass inserts for wood utilize an external sharp thread to slice into the wood, which generates major holding power.

Brass inserts are most usually machined out of brass when internal thread sizes range from #8 to 3/8.

• Superior hardwood holding power
• Sizing variety, inch
• Brass
• Easily installs with a screwdriver, bolt/jam nut, or optional drive tool

Mainly utilized  for:

• Furniture
• Cabinetry
• Partitions
• Shipping Containers
• In wood-turning for handles and bottle stoppers

Shop–Made Threaded Insert Drivers :

Note: Bolt must be of the proper size-to thread into the threaded insert

This design will allow threaded inserts to be inducted using a power drill. Use this design when you need to install the threaded inserts manually with a socket or open-end wrench.

T-Nuts (Tee-Nuts)

“Tee” nuts also supply internal threads but have a margin with extension above stakes that lock into the wood, holding it in position. “Tee” nuts must be inducted such that the border is pulled against the wood when a load is applied. If inducted backward, the “tee” nut will simply unseat when a load is applied. Induction is simple, just drill the appropriate-size pilot hole and pound the nut into proper position.

Top Manufacturers and Suppliers in India of Insert Nuts –
1. Kapasi Inc. (Kapasi Fasteners)
2. State Enterprises
3. Viha Steel and forging
4. Bagadia Industrial fasteners
5. Essentra Components
6. Ramesh Steel Corporation

7. Siddhivinayak enterprise

Top Manufacturers and Suppliers of Insert Nuts in the World –
1. Sundream group, Noida
2. Sundram Fasteners Ltd., Chennai
3. Daksh Fasteners in Ludhiana, Punjab
4. Sterling Tools Ltd., Faridabad
5. Kapsons India
6. GS Auto International Ltd
7. Remax Fasteners Industries (India), Ludhiana
8. Simmonds Marshall Ltd., Pun
9. Varun Enterprises, Ludhiana

10. Kova Fasteners Pvt. Ltd., Ludhiana.

11. Siddhivinayak enterprise