Best Parting Inserts for Plastics

Looking for the best parting inserts for plastics? Discover top picks for clean, precise cuts with our easy guide!

Parting inserts are essential tools for cutting plastics with precision. They help you achieve clean, accurate cuts every time. Whether you’re working on small parts or large projects, the right insert makes all the difference.

Choosing the best parting insert depends on your material and cutting needs. High-speed steel and carbide inserts are popular choices for plastics. They offer durability and efficiency, ensuring smooth cuts without wasting material.

Ready to find the perfect parting insert for your plastic cutting tasks? Our guide will help you make the right choice with ease. Let’s dive in and discover the best options for your needs!

List of Top 10 Parting Inserts for Plastics

Title	Best For	Price
THINBIT 3 Pack LGPT062HSR ‘L’ Series, Uncoated High Speed Steel, Parting Insert for Plastics, Composites, Abusive Cutting Conditions and Low RPM Cutting	This THINBIT parting insert is perfect for anyone cutting plastics, composites, or working in tough conditions. It’s ideal for low RPM cutting and narrow parts, like thin tubing or small pieces.	View on Amazon (paid link)
THINBIT 3 Pack LGPT062D5R ‘L’ Series, Uncoated Carbide, Parting Insert for Non-Ferrous Alloys, Aluminium and Plastic Without Interrupted Cuts	This THINBIT parting insert is perfect for machinists working with non-ferrous alloys, aluminium, and plastic. It’s ideal for cutting thin materials like precious metals, tubing, or small parts without wasting material.	View on Amazon (paid link)
THINBIT 3 Pack LGPT045D5R ‘L’ Series, Uncoated Carbide, Parting Insert for Non-Ferrous Alloys, Aluminium and Plastic Without Interrupted Cuts	This THINBIT parting insert is perfect for machinists working with non-ferrous alloys, aluminium, and plastic. It’s ideal for cutting thin materials like precious metals, tubing, and small parts without wasting material.	View on Amazon (paid link)
THINBIT 3 Pack LGPT025D5R ‘L’ Series, Uncoated Carbide, Parting Insert for Non-Ferrous Alloys, Aluminium and Plastic Without Interrupted Cuts	This THINBIT 3 Pack LGPT025D5R is perfect for machinists working with non-ferrous alloys, aluminium, and plastic. It’s ideal for cutting thin materials like precious metals, tubing, and small parts without wasting material.	View on Amazon (paid link)
THINBIT 3 Pack LGPT085HSE ‘L’ Series, TiAlN Coated High Speed Steel, Parting Insert for Plastics, Composites, Abusive Cutting Conditions and Low RPM Cutting	This product is perfect for machinists working with plastics, composites, or tough materials in abusive cutting conditions or low RPM settings. Its TiAlN coated high-speed steel design ensures durability, while narrow widths reduce waste and deflection, ideal for precious metals, thin tubing, or small parts.	View on Amazon (paid link)
THINBIT 3 Pack LGPT045D5R7R ‘L’ Series, Uncoated Carbide, Parting Insert for Non-Ferrous Alloys, Aluminium and Plastic Without Interrupted Cuts	This product is perfect for machinists working with non-ferrous alloys, aluminum, or plastic. Its narrow width reduces material loss and cuts flush in tight spaces, ideal for thin-wall tubing or small-diameter parts.	View on Amazon (paid link)
THINBIT 3 Pack LGPT062HSE ‘L’ Series, TiAlN Coated High Speed Steel, Parting Insert for Plastics, Composites, Abusive Cutting Conditions and Low RPM Cutting	This product is perfect for machinists working with plastics, composites, or abusive cutting conditions. Its TiAlN coating and narrow widths reduce material loss and deflection, ideal for precision parts, thin walls, or low RPM jobs.	View on Amazon (paid link)
THINBIT 3 Pack LGPT045D5 ‘L’ Series, Uncoated Carbide, Parting Insert for Non-Ferrous Alloys, Aluminium and Plastic Without Interrupted Cuts	This THINBIT parting insert is perfect for machinists working with non-ferrous alloys, aluminium, and plastic. It’s ideal for cutting thin materials like precious metals, tubing, and small parts with minimal waste.	View on Amazon (paid link)
THINBIT 3 Pack LGPT045HSE ‘L’ Series, TiAlN Coated High Speed Steel, Parting Insert for Plastics, Composites, Abusive Cutting Conditions and Low RPM Cutting	This THINBIT parting insert is perfect for anyone cutting plastics, composites, or working in tough conditions. It’s also great for low RPM cutting and precious materials like thin metals or small parts.	View on Amazon (paid link)
THINBIT 3 Pack LGPT115HSE ‘L’ Series, TiAlN Coated High Speed Steel, Parting Insert for Plastics, Composites, Abusive Cutting Conditions and Low RPM Cutting	This THINBIT parting insert is perfect for anyone cutting plastics, composites, or working in tough conditions. It’s also great for low RPM cutting and narrow, precise cuts.	View on Amazon (paid link)

Detailed Reviews

Discover the top 10 parting inserts for plastics, carefully selected based on expert reviews and customer feedback. Each product is evaluated for performance, durability, and value, ensuring you find the perfect fit for your needs. Whether you’re cutting thin materials or handling tough jobs, this guide has you covered.

1. THINBIT 3 Pack LGPT062HSR ‘L’ Series, Uncoated High Speed Steel, Parting Insert for Plastics, Composites, Abusive Cutting Conditions and Low RPM Cutting

THINBIT 3 Pack LGPT062HSR 'L' Series, Uncoated High Speed Steel, Parting Insert for Plastics, Composites, Abusive Cutting Conditions and Low RPM Cutting

The THINBIT 3 Pack LGPT062HSR is a high-speed steel parting insert designed for cutting plastics, composites, and tough materials. It works well in low RPM conditions and handles abusive cutting with ease.

Use it for parting solid stock up to 1.000″ or tubing with walls up to .500″. It fits Large series toolholders and works with RH straight or LH 90-degree holders.

Pros	Cons
Minimizes material loss with narrow widths for efficient cutting. Perfect for thin materials like tubing and precious metals. Handles tough conditions in plastics, composites, and low RPM cutting. Versatile use with large series toolholders for precise parting.	Limited to specific toolholders and cutting conditions. Uncoated steel may wear faster in tough jobs. Not ideal for high RPM cutting applications.

Perfect For:

This THINBIT parting insert is perfect for anyone cutting plastics, composites, or working in tough conditions. It’s ideal for low RPM cutting and narrow parts, like thin tubing or small pieces.

Ready to Purchase?

View Price on Amazon (paid link)

2. THINBIT 3 Pack LGPT062D5R ‘L’ Series, Uncoated Carbide, Parting Insert for Non-Ferrous Alloys, Aluminium and Plastic Without Interrupted Cuts

The THINBIT 3 Pack LGPT062D5R is a parting insert designed for non-ferrous alloys, aluminium, and plastic. It works best with solid stock up to 1.000″ and tubing with walls up to .500″. This insert is uncoated and made from DURA-MAX 5000 carbide.

Its narrow widths reduce material loss and part deflection, making it ideal for precious metals, thin wall tubing, and small parts. It cuts flush to the collet face or shoulder on the main spindle side using M03 or sub-spindle side using M04.

Use this insert with Large series toolholders, either RH straight or LH 90 degree. Check the Downloads section below the photos for detailed product information and compatible toolholders.

Pros	Cons
Minimizes material loss with narrow widths for precious metals. Cuts flush to collet face or shoulder for precision. Handles solid stock up to 1.000″ and tubing up to .500″. Uncoated carbide for non-ferrous alloys, aluminium, and plastic.	Not for hard metals or interrupted cuts. Requires specific toolholders for proper use. Limited to non-ferrous materials only.

Perfect For:

This THINBIT parting insert is perfect for machinists working with non-ferrous alloys, aluminium, and plastic. It’s ideal for cutting thin materials like precious metals, tubing, or small parts without wasting material.

Ready to Purchase?

View Price on Amazon (paid link)

3. THINBIT 3 Pack LGPT045D5R ‘L’ Series, Uncoated Carbide, Parting Insert for Non-Ferrous Alloys, Aluminium and Plastic Without Interrupted Cuts

The THINBIT 3 Pack LGPT045D5R is a parting insert designed for non-ferrous alloys, aluminium, and plastic. It’s perfect for clean, uninterrupted cuts.

Narrow widths reduce material loss and part deflection. Ideal for precious metals, thin tubing, and small parts. Works with M03 or M04 spindle sides.

Use it for solid stock up to 1.000″ or tubing with .500″ walls. Made from uncoated DURA-MAX 5000 carbide. Compatible with Large series toolholders.

Pros	Cons
Minimizes material loss with narrow widths for efficient cutting. Perfect for precious metals and thin-walled parts. Cuts flush to collet face or shoulder for precision. Durable uncoated carbide for non-ferrous alloys and plastics.	Not for ferrous metals or materials with interrupted cuts. Requires specific toolholders, limiting compatibility with other systems. Uncoated carbide may wear faster in certain applications.

Perfect For:

Ready to Purchase?

View Price on Amazon (paid link)

4. THINBIT 3 Pack LGPT025D5R ‘L’ Series, Uncoated Carbide, Parting Insert for Non-Ferrous Alloys, Aluminium and Plastic Without Interrupted Cuts

The THINBIT 3 Pack LGPT025D5R is a parting insert designed for non-ferrous alloys, aluminium, and plastic. It’s perfect for clean, uninterrupted cuts.

Narrow widths reduce material loss and part deflection. It’s ideal for precious metals, thin wall tubing, and small parts. Works with M03 or M04 spindle sides.

Use it for solid stock up to .400″ or tubing with .200″ walls. Made from uncoated DURA-MAX 5000 carbide. Compatible with Large series toolholders.

Pros	Cons
Minimizes material loss with narrow widths for efficient cutting. Perfect for precious metals and thin-walled parts. Cuts flush to collet face or shoulder for precision. Uncoated carbide handles non-ferrous alloys, aluminum, and plastic smoothly. Compatible with large toolholders for versatile use.	Not for ferrous metals, limiting use in some projects. No coating, may wear faster in tough cuts. Specific toolholders needed, adds extra setup steps.

Perfect For:

This THINBIT 3 Pack LGPT025D5R is perfect for machinists working with non-ferrous alloys, aluminium, and plastic. It’s ideal for cutting thin materials like precious metals, tubing, and small parts without wasting material.

Ready to Purchase?

View Price on Amazon (paid link)

5. THINBIT 3 Pack LGPT085HSE ‘L’ Series, TiAlN Coated High Speed Steel, Parting Insert for Plastics, Composites, Abusive Cutting Conditions and Low RPM Cutting

THINBIT 3 Pack LGPT085HSE 'L' Series, TiAlN Coated High Speed Steel, Parting Insert for Plastics, Composites, Abusive Cutting Conditions and Low RPM Cutting

The THINBIT 3 Pack LGPT085HSE is a high-speed steel parting insert designed for precision cutting. It’s TiAlN coated for durability and longevity, making it ideal for tough cutting conditions.

This insert works well with plastics, composites, and low RPM cutting. Its narrow width reduces material waste and is perfect for thin materials like tubing and precious metals.

Use it with large series toolholders. Cuts solid stock up to 1.000″ or tubing walls up to .500″. Perfect for precise, efficient work.

Pros	Cons
Minimizes material loss with narrow widths for precise cuts. Handles tough jobs in abusive cutting conditions effortlessly. Versatile use for plastics, composites, and precious metals. Works at low RPMs for controlled, efficient cutting.	Limited to specific toolholders and materials. Not ideal for high RPM cutting applications. Narrow widths may require more passes for larger parts.

Perfect For:

This product is perfect for machinists working with plastics, composites, or tough materials in abusive cutting conditions or low RPM settings. Its TiAlN coated high-speed steel design ensures durability, while narrow widths reduce waste and deflection, ideal for precious metals, thin tubing, or small parts.

Ready to Purchase?

View Price on Amazon (paid link)

6. THINBIT 3 Pack LGPT045D5R7R ‘L’ Series, Uncoated Carbide, Parting Insert for Non-Ferrous Alloys, Aluminium and Plastic Without Interrupted Cuts

The THINBIT 3 Pack LGPT045D5R7R is a parting insert designed for non-ferrous alloys, aluminium, and plastic. It works best with Large series toolholders and is uncoated for smooth cuts. Check the Downloads section for detailed product info.

Its narrow widths reduce material loss and part deflection, making it ideal for precious metals and thin-walled tubing. It cuts flush to the collet face or shoulder on the main spindle side using M03 or sub-spindle side using M04. Use it for parting solid stock up to 1.000″ or tubing with walls up to .500″.

This insert is made from DURA-MAX 5000 carbide, ensuring durability and precision. Pair it with RH straight or LH 90-degree toolholders for efficient cutting.

Pros	Cons
Minimizes material loss with narrow widths for precious metals and thin parts. Cuts flush to collet face or shoulder for precise results. Handles solid stock up to 1.000″ and tubing up to .500″. Uncoated carbide ensures durability for non-ferrous alloys and plastics.	Not for ferrous metals or materials with interrupted cuts. Requires specific toolholders, limiting versatility in setups. Uncoated carbide may wear faster in tough applications.

Perfect For:

This product is perfect for machinists working with non-ferrous alloys, aluminum, or plastic. Its narrow width reduces material loss and cuts flush in tight spaces, ideal for thin-wall tubing or small-diameter parts.

Ready to Purchase?

View Price on Amazon (paid link)

7. THINBIT 3 Pack LGPT062HSE ‘L’ Series, TiAlN Coated High Speed Steel, Parting Insert for Plastics, Composites, Abusive Cutting Conditions and Low RPM Cutting

THINBIT 3 Pack LGPT062HSE 'L' Series, TiAlN Coated High Speed Steel, Parting Insert for Plastics, Composites, Abusive Cutting Conditions and Low RPM Cutting

The THINBIT 3 Pack LGPT062HSE is a high-speed steel parting insert designed for precision cutting. It’s TiAlN coated for durability and performance.

Narrow widths reduce waste and part movement. Perfect for precious metals and thin materials. Cuts close to the collet face or shoulder.

Use it for solid stock up to 1.000″ or tubing with walls up to .500″. Works in abusive conditions and low RPM cutting. Compatible with large series toolholders.

Pros	Cons
Minimizes material loss with narrow widths for efficient cutting. Handles tough jobs in abusive cutting conditions effortlessly. Perfect for plastics and composites with TiAlN coating. Versatile use with any straight or 90-degree toolholder.	Not for high RPM cutting, limiting some applications. Requires specific toolholders, adding extra cost and setup. Coating may wear faster in extremely abusive conditions.

Perfect For:

This product is perfect for machinists working with plastics, composites, or abusive cutting conditions. Its TiAlN coating and narrow widths reduce material loss and deflection, ideal for precision parts, thin walls, or low RPM jobs.

Ready to Purchase?

View Price on Amazon (paid link)

8. THINBIT 3 Pack LGPT045D5 ‘L’ Series, Uncoated Carbide, Parting Insert for Non-Ferrous Alloys, Aluminium and Plastic Without Interrupted Cuts

The THINBIT 3 Pack LGPT045D5 is a parting insert designed for non-ferrous alloys, aluminium, and plastic. It works best with solid stock up to 1.000″ or tubing with walls up to .500″. Use it with Large series toolholders for straight or 90-degree cuts.

This insert has narrow widths, reducing material loss and part deflection. It’s ideal for precious metals, thin wall tubing, and small parts. Cuts can be made within .062″ of the collet face or shoulder.

Made from uncoated DURA-MAX 5000 carbide, it’s durable and long-lasting. Check the Downloads section for detailed product info and compatible toolholders. This insert ensures smooth, uninterrupted cuts every time.

Pros	Cons
Narrow widths minimize material loss and reduce part deflection. Cuts close to collet face or shoulder for precision work. Perfect for precious metals, thin tubing, and small parts. Uncoated carbide handles non-ferrous alloys, aluminum, and plastic smoothly.	Not for ferrous metals or materials with interrupted cuts. Requires specific toolholders, limiting versatility in some setups. No coating may reduce lifespan in tougher applications.

Perfect For:

Ready to Purchase?

View Price on Amazon (paid link)

9. THINBIT 3 Pack LGPT045HSE ‘L’ Series, TiAlN Coated High Speed Steel, Parting Insert for Plastics, Composites, Abusive Cutting Conditions and Low RPM Cutting

THINBIT 3 Pack LGPT045HSE 'L' Series, TiAlN Coated High Speed Steel, Parting Insert for Plastics, Composites, Abusive Cutting Conditions and Low RPM Cutting

The THINBIT 3 Pack LGPT045HSE is a high-speed steel parting insert. It’s coated with TiAlN for extra strength. Use it for plastics, composites, and tough cutting jobs.

Its narrow design cuts close to the collet face. It’s perfect for thin materials and small parts. Works with solid stock up to 1.000″ and tubing walls up to .500″.

Use it with large series toolholders. Works with straight or 90-degree holders. Check the Downloads section for more details.

Pros	Cons
Reduces material loss with narrow widths for precious metals. Cuts close to collet face or shoulder, saving material. Handles tough jobs in plastics, composites, and abusive conditions. Versatile use with large series and 90-degree toolholders.	Limited to specific toolholders, not universal fit. Not ideal for high RPM cutting conditions. Narrow widths may not suit all material types.

Perfect For:

This THINBIT parting insert is perfect for anyone cutting plastics, composites, or working in tough conditions. It’s also great for low RPM cutting and precious materials like thin metals or small parts.

Ready to Purchase?

View Price on Amazon (paid link)

10. THINBIT 3 Pack LGPT115HSE ‘L’ Series, TiAlN Coated High Speed Steel, Parting Insert for Plastics, Composites, Abusive Cutting Conditions and Low RPM Cutting

THINBIT 3 Pack LGPT115HSE 'L' Series, TiAlN Coated High Speed Steel, Parting Insert for Plastics, Composites, Abusive Cutting Conditions and Low RPM Cutting

The THINBIT 3 Pack LGPT115HSE is a high-speed steel parting insert designed for precision cutting. It’s TiAlN coated for durability and longevity, making it ideal for tough cutting conditions.

This insert works well with plastics, composites, and low RPM cutting. It’s perfect for precious metals, thin walls, and small parts. Use it with large series toolholders for straight or 90-degree cuts.

Check the Downloads section for detailed product info and compatible toolholders. This insert ensures minimal material loss and precise cuts every time.

Pros	Cons
Minimizes material loss with narrow widths for precious metals and thin parts. Cuts close to collet face or shoulder, saving material. Handles tough jobs in plastics, composites, and low RPM cutting. Versatile use with large series toolholders and 90-degree setups.	Not for high-speed cutting, limits use in fast-paced work. Requires specific toolholders, adds extra cost and setup. Coating may wear faster in tough cutting conditions.

Perfect For:

This THINBIT parting insert is perfect for anyone cutting plastics, composites, or working in tough conditions. It’s also great for low RPM cutting and narrow, precise cuts.

Ready to Purchase?

View Price on Amazon (paid link)

Buying Guide

Parting inserts are key tools for cutting plastics with precision. They help you achieve clean, accurate cuts every time. The right insert makes your work easier and more efficient.

Choosing the best parting insert can be fun and simple. We’ll guide you through the process, so you feel confident in your choice. Let’s explore the top options and find the perfect fit for your needs!

Here are the factors to consider when buying parting inserts for plastics:

Material Compatibility:
Choose inserts designed for plastics to ensure smooth and precise cuts. Look for high-speed steel or carbide options, as they work best with plastics.
Cutting Conditions:
Consider if you’re working in low RPM or abusive cutting conditions. Some inserts are built to handle tough jobs without breaking.
Insert Width:
Narrow widths reduce material loss and part deflection. They’re ideal for thin materials and small parts.
Coating:
Coated inserts, like TiAlN, offer extra durability and longevity. They’re great for demanding tasks.
Toolholder Compatibility:
Ensure the insert fits your toolholder. Large series toolholders are common for parting inserts.
Cutting Depth:
Check the insert’s ability to handle solid stock or tubing walls. Match it to your project’s needs.
Material Loss:
Look for inserts that minimize waste, especially when working with precious metals or expensive plastics.

With these factors in mind, you’ll find the perfect parting insert for your plastic cutting tasks. Happy cutting!