Frequently Asked Questions About Threaded Inserts for Plastic

Can Threaded Inserts Be Used in All Types of Plastic?

Threaded inserts can be utilized in a wide range of plastics, particularly those common in injection molding processes. These inserts are versatile and come with various features such as knurling and undercuts to enhance torque and pull-out resistance, making them suitable for most injection molding plastics. Different inserts, including press-in, self-tapping, molded-in, heat, and ultrasonic types, are designed for specific plastic types and installation requirements​​.

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Where Can I Find Technical Specifications and Strength Ratings for Different Threaded Inserts?

Technical specifications and strength ratings for our threaded inserts can be found in our resources section and safety data sheets. These documents provide detailed information about insert materials, sizes, design features, and performance characteristics, helping users select the most appropriate insert for their application. For instance, inserts are available in materials like brass, stainless steel, and aluminum, each offering unique benefits such as corrosion resistance or reduced weight​​. Samples are also available for customers to test in their specific applications.

How Can I Test the Integrity of the Threaded Insert Installation in My Plastic Component?

Testing the integrity of threaded insert installation involves examining the insert's pull-out and torque resistance after installation. This can be achieved through manual testing methods or specialized equipment designed to measure the force required to dislodge the insert. For accurate testing, it's crucial to follow the manufacturer's guidelines on the proper installation techniques and conditions for the specific type of insert used, such as ensuring the correct hole size and installation pressure​​​​. We have a breakdown of the general mechanical testing data we obtained for each of our inserts to use as a guide.

Trust E-Z LOK for Threaded Inserts for Plastic

Choosing threaded inserts for plastic from E-Z LOK means opting for quality, reliability, and ease of use. E-Z LOK's inserts stand out for their innovative design, ensuring a secure fit and superior performance in various plastic applications. Whether you're working with thermoset or thermoplastic materials, E-Z LOK offers a range of inserts designed to meet your project's specific needs. Our user-friendly installation process eliminates the need for specialized tools, making us a preferred choice for professionals and hobbyists alike. By selecting E-Z LOK, you're not just choosing an insert; you're investing in the longevity and success of your project.

Browse our selection of threaded inserts and discover the difference we can make today.

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How to choose the thread turning insert and shim

When choosing the most suitable thread turning insert for your application, you need to consider the insert type, flank/radial clearance, and insert geometry. These are all factors that influences chip control, insert wear, tool life, and thread quality.

How to choose the insert type

When turning a thread, there are three main insert types to choose from: full profile, V-profile, and multi-point inserts. Each type has its advantages and disadvantages.

Full profile insert

The full profile insert is the most common insert type. It is used to cut a complete thread profile, including the crest.

Advantages

• Ensures correct depth, bottom, and top profile for a stronger thread
• No deburring of the thread profile needed
• Fewer passes required compared to a V-profile insert thanks to the larger nose radius
• Gives a productive threading performance.

Disadvantage

A separate insert is required for each pitch and profile.

Note: Extra stock/material should be left on the workpiece for topping the finish diameter of the thread (0.05–0.07 mm (0.002–0.003 inch)).

V-profile insert

V-profile inserts do not top the thread crests. Therefore, the outer diameter for screws and inner diameter for nuts must be turned to the right diameter prior to threading.

Advantages

• Flexibility: the same insert can be used for a range of pitches, provided that the thread profile angle (60° or 55°) and radius are the same
• Minimum tool inventory needed

Disadvantages

• The insert nose radius is smaller to cover the range of pitches, which reduces tool life
• Burr formation can be a problem

Multi-point insert

Multi-point inserts are similar than full profile inserts but have more than one insert point (NT>1). A two-point insert doubles the productivity, and a three-point insert triples the productivity, etc.

Advantages

• Requires fewer passes, which gives better tool life, productivity, and lower tool costs

Disadvantages

• Stable conditions are needed as a result of increased cutting forces as the cutting edge has a longer contact length
• Needs sufficient room behind the last thread to clear the last tooth of the insert, generating a full thread depth

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How to choose the insert geometry

Selecting the correct insert geometry is important when thread turning. The geometry influences chip control, insert wear, thread quality, and tool life.

Flat geometry

• All-round, can be used for most materials
• Edge rounded cutting edge for edge strength

Sharp geometry

• For sticky or work-hardening materials, e.g., low-carbon steel, stainless steel, non-ferrous materials, and super alloys
• Sharp cutting edge for low cutting forces and good surface finish

Chip-breaking geometry

• For long-chipping materials, e.g., low-carbon materials. Can also be used for stainless steel, alloyed steel, and non-ferrous materials
• Chip-forming geometry that enables a more continuous and unsupervised machining
• Not to be used with radial infeed

Read more about threading inserts and grades

Insert clearance angles

Angular clearance between the insert and thread is necessary for precise, accurate thread turning. There are two types, radial clearance (ALP) and flank clearance (ALF).

Radial clearanceFlank clearance

Flank clearance

Cutting edge clearance between the sides of the insert and thread flank is essential to ensure even tool wear and consistent, high-quality threads. The insert should therefore be tilted to gain maximum symmetrical clearance from the flanks (flank clearance angle) and get the correct thread profile. The tilt angle of the insert should be the same as the helix of the thread.

Flank clearance

If you want to learn more, please visit our website Threading Inserts.

Selection of shim

Insert shims are used to give different tilts to the insert, so that the angle of insert inclination (λ) is the same as the helix of the thread. See table below for methods on how to select the correct insert shim.

• The standard shim in many holders is 1°, which is the most common angle of inclination
• Negative shims are used when turning left-hand threads with right-hand tools, and vice versa

Lead (pitch) mmThreads/inch Workpiece
diametermm
inch

Example:

• Pitch = 6 mm and workpiece = Ø 40 m: a 3° shim is required
• Pitch = 5 threads per inch and workpiece = Ø 4 inches: a 1° shim is required

Threads with small profile angles

ALP = Radial clearance
ALF = Flank clearance

For ACME, trapezoidal, and rounded threads, it is especially important to choose the correct shim to tilt the insert, because the pressure on the cutting edge is higher, and the flank clearance is smaller.

Flank clearance (ALF) depends on profile

Flank clearance
(ALF)Flank clearance
(ALF) Metric, UN60°7.6°5° Whitworth55°7.1°4.7° Trapezoidal30°4°2.6° ACME29°3.8°2.5° Buttress10°/3°2.7°/0.8°1.8°/0.5°

Radial clearance

To set the correct radial clearance, the inserts are tilted 10° or 15° in the tool holder. It is important to use internal inserts with internal tool holders, and vice versa, to ensure that the correct thread form is achieved.

Insert sizes:
11, 16, and 22 mm
(1/4, 3/8, and 1/2 inch)

Insert size:
27 mm (5/8 inch)

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