Best Thin Parting Inserts

Looking for the best thin parting inserts to enhance your cutting precision? Discover our top 10 picks designed to deliver clean, efficient cuts for metals, plastics, and composites, tailored to your specific needs.

Thin parting inserts are essential tools for precision cutting in various materials. Whether you’re working with metals, plastics, or composites, the right insert can make all the difference. This guide highlights the best thin parting inserts to help you achieve clean, efficient cuts every time.

Choosing the right insert depends on your material and cutting needs. Uncoated carbide and high-speed steel options offer durability and versatility. Narrow widths reduce waste and ensure smooth results, even in tight spaces.

Discover the top-rated inserts that professionals trust. From CNC lathes to manual tools, find the perfect match for your projects. Let’s dive in and explore the best options to elevate your cutting game.

List of Top 10 Thin Parting Inserts

Title	Best For	Price
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 without wasting material.	View on Amazon (paid link)
THINBIT 3 Pack LGPT025HSR ‘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 cutting plastics, composites, and materials under tough conditions. It’s also great for low RPM cutting and works well with precious metals, thin tubing, and small parts.	View on Amazon (paid link)
GTN-3 (SP300) Carbide Inserts, 3.0mm Width CNC Lathe Grooving Cut-Off Parting Tool for Steel, CVD Yellow Coating Self-Locking Blades fit for SPB326 SPB332 Holder, 10pcs	GTN-3 (SP300) Carbide Inserts are perfect for CNC lathe users who need precise and efficient cutting tools. These inserts are ideal for steel processing, pipe fittings, and small parts, offering sharp cutting edges and low cutting force.	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 is perfect for makers who need clean cuts, low waste, and steady results when working with soft metals or plastic. It’s great for anyone who wants smooth parting on small parts without stress.	View on Amazon (paid link)
3 Pack SPT045D2 THINBIT LITTLEBIT ‘S’ Series Parting Insert, Uncoated Carbide for Steel, cast Iron and Stainless Steel with Interrupted cuts	This 3 Pack SPT045D2 THINBIT LITTLEBIT ‘S’ Series Parting Insert is perfect for machinists and manufacturers working with steel, cast iron, and stainless steel. It’s ideal for cutting thin materials like tubing or small parts with minimal waste.	View on Amazon (paid link)
Accusize Industrial Tools GTN-3 Tin Coated Carbide Grooving Parting Inserts, 10 Pcs/Box, 6103-2003×10	Accusize Industrial Tools GTN-3 inserts are perfect for machinists and metalworkers who need reliable tools for cutting and grooving. They work best on mild steel and stainless steel, making them ideal for professionals in manufacturing or metal fabrication.	View on Amazon (paid link)
3 Pack SPT025D2 THINBIT LITTLEBIT ‘S’ Series Parting Insert, Uncoated Carbide for Steel, cast Iron and Stainless Steel with Interrupted cuts	This 3 Pack SPT025D2 THINBIT LITTLEBIT ‘S’ Series Parting Insert is perfect for machinists and metalworkers who need precise cuts on steel, cast iron, and stainless steel. It’s ideal for working with precious metals, thin tubing, and small parts.	View on Amazon (paid link)
THINBIT 3 Pack LGPT085HSR7R ‘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 precious metals.	View on Amazon (paid link)
3 Pack SPT045D5 THINBIT LITTLEBIT ‘S’ Series Parting Insert, Uncoated Carbide for Non-Ferrous alloys, Aluminium, Plastic no Interrupted cuts	This 3 Pack SPT045D5 THINBIT LITTLEBIT ‘S’ Series Parting Insert is perfect for anyone working with non-ferrous alloys, aluminium, or plastic. It’s ideal for cutting thin materials like precious metals, tubing, or small parts without wasting material.	View on Amazon (paid link)
ASZLBYM Lathe Turning Tools Slotted SPB26-3, Cutting Insert Lathe CNC SPB Grooving Cut-Off Tool with 12 pcs SP300 Carbide Inserts and 1pc SMBB1626 Grooving Parting Blade Plate	This ASZLBYM Lathe Turning Tools Set is perfect for anyone working with stainless steel parts. Whether you’re a hobbyist or a professional machinist, this kit offers high precision, efficiency, and durability for your CNC lathe projects.	View on Amazon (paid link)

Detailed Reviews

This guide brings you the best thin parting inserts chosen with care and skill. Each pick is checked for performance, value, and real‑world results. You can trust this guide to help you choose with confidence. The clear details will make you want to keep reading.

1. 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 features uncoated DURA-MAX 5000 carbide for durability. This insert is ideal for precise cuts without interruptions.

Its narrow widths reduce material loss and part deflection. It works well with precious metals, thin wall tubing, and small diameter parts. Cuts can be made within .062″ of the collet face or shoulder of larger diameters.

Use it for parting solid stock up to 1.000″ or tubing with walls up to .500″. It’s compatible with Large series toolholders and works with straight or 90-degree holders. Check the Downloads section for detailed product info.

Pros	Cons
Minimizes material loss with narrow widths for efficient cutting. Perfect for precious metals and thin-walled parts. Cuts close to collet face or shoulder for precision. Uncoated carbide handles non-ferrous alloys and plastics smoothly. Compatible with large toolholders for versatile use.	Not for ferrous metals or materials with interrupted cuts. Requires specific toolholders, limiting versatility in some setups. Uncoated carbide may wear faster in certain applications.

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, and small parts without wasting material.

Ready to Purchase?

View Price on Amazon (paid link)

2. THINBIT 3 Pack LGPT025HSR ‘L’ Series, Uncoated High Speed Steel, Parting Insert for Plastics, Composites, Abusive Cutting Conditions and Low RPM Cutting

THINBIT 3 Pack LGPT025HSR 'L' Series, Uncoated High Speed Steel, Parting Insert for Plastics, Composites, Abusive Cutting Conditions and Low RPM Cutting

This THINBIT 3 Pack insert gives you clean cuts with ease. It works well on plastics and composites. It stays strong in tough, low‑speed jobs.

The narrow width helps save material. It keeps parts steady as you cut. It also works close to the collet face for smooth results.

Use it for solid stock up to .400″ or tubing up to .200″. It fits Large series toolholders with no fuss.

Pros	Cons
Minimizes material loss with narrow widths for efficient cutting. Cuts flush to collet face or shoulder for precise results. Handles tough jobs in plastics, composites, and abusive conditions. Versatile use with large series toolholders for flexible applications.	Not ideal for high‑speed cutting Needs large series toolholders Limited to small stock sizes

Perfect For:

This THINBIT parting insert is perfect for cutting plastics, composites, and materials under tough conditions. It’s also great for low RPM cutting and works well with precious metals, thin tubing, and small parts.

Ready to Purchase?

View Price on Amazon (paid link)

3. GTN-3 (SP300) Carbide Inserts, 3.0mm Width CNC Lathe Grooving Cut-Off Parting Tool for Steel, CVD Yellow Coating Self-Locking Blades fit for SPB326 SPB332 Holder, 10pcs

GTN-3 (SP300) Carbide Inserts, 3.0mm Width CNC Lathe Grooving Cut-Off Parting Tool for Steel, CVD Yellow Coating Self-Locking Blades fit for SPB326 SPB332 Holder, 10pcs

The GTN-3 (SP300) Carbide Inserts are precision tools for CNC lathes. They are designed for grooving and cutting steel with ease.

These inserts have a CVD yellow coating for longer life. They fit SPB326 and SPB332 holders perfectly. The self-locking blades ensure secure and stable cutting.

Ideal for soft materials and thin-wall parts. They offer sharp edges and low cutting force. Perfect for low to medium-speed processing.

Pros	Cons
Sharp cutting edge ensures precise and clean cuts every time. Low cutting force reduces tool wear and extends lifespan. High thermal shock resistance handles tough jobs with ease. Self-locking blades fit securely for safe and efficient work.	Not for high-speed cutting, only low to medium feed rates. Single-sided design limits versatility in certain applications. Soft materials only, not ideal for hard or tough jobs.

Perfect For:

GTN-3 (SP300) Carbide Inserts are perfect for CNC lathe users who need precise and efficient cutting tools. These inserts are ideal for steel processing, pipe fittings, and small parts, offering sharp cutting edges and low cutting force.

Ready to Purchase?

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4. 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’s perfect for clean cuts without interruptions.

Narrow widths reduce material loss and part deflection. It works well with precious metals, thin wall tubing, and small parts. Use it for solid stock up to 1.000″ or tubing with walls up to .500″.

Made with uncoated DURA-MAX 5000 carbide, it’s durable and reliable. Pair it with Large series toolholders for straight or 90-degree cuts. Check the Downloads section for detailed info.

Pros	Cons
Minimizes material loss with narrow widths for precious metals and thin tubing. Cuts flush to collet face or shoulder for precise results. Handles solid stock up to 1.000″ and tubing walls 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 compatibility with other systems. Uncoated carbide may wear faster in certain applications.

Perfect For:

This is perfect for makers who need clean cuts, low waste, and steady results when working with soft metals or plastic. It’s great for anyone who wants smooth parting on small parts without stress.

Ready to Purchase?

View Price on Amazon (paid link)

5. 3 Pack SPT045D2 THINBIT LITTLEBIT ‘S’ Series Parting Insert, Uncoated Carbide for Steel, cast Iron and Stainless Steel with Interrupted cuts

The 3 Pack SPT045D2 THINBIT LITTLEBIT ‘S’ Series Parting Insert is a powerful tool for cutting steel, cast iron, and stainless steel. It works well with interrupted cuts, making it versatile for various projects.

Its narrow widths reduce material loss and part deflection, perfect for precious metals and thin materials. It cuts close to the collet face or shoulder, ideal for small parts and tight spaces.

Uncoated DURA-MAX 2000 carbide ensures durability. Use with Small series toolholders for best results.

Pros	Cons
Minimizes material loss with narrow widths for efficient cutting. Perfect for thin walls and small parts, ensuring precise results. Handles steel, cast iron, and stainless with uncoated carbide durability. Cuts close to collet face, ideal for tight spaces.	Needs small series holders Not ideal for very thick stock Uncoated insert may wear faster

Perfect For:

This 3 Pack SPT045D2 THINBIT LITTLEBIT ‘S’ Series Parting Insert is perfect for machinists and manufacturers working with steel, cast iron, and stainless steel. It’s ideal for cutting thin materials like tubing or small parts with minimal waste.

Ready to Purchase?

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6. Accusize Industrial Tools GTN-3 Tin Coated Carbide Grooving Parting Inserts, 10 Pcs/Box, 6103-2003×10

Accusize Industrial Tools GTN-3 Tin Coated Carbide Grooving Parting Inserts, 10 Pcs/Box, 6103-2003x10

Accusize Industrial Tools GTN-3 inserts are perfect for cutting and grooving. They work with SPH, SPD, and SPDZ holders.

These TiN-coated carbide inserts handle extra force at high speeds. They are ideal for mild and stainless steel machining.

C6 grade coating ensures longer tool life. 10 pieces per box offer great value.

Pros	Cons
GTN-3 Carbide Inserts for precise cut-off and grooving. TiN Coating handles high speeds and extra force. C6 Grade Coating ideal for steel machining. Versatile for SPH, SPD, and SPDZ holders.	Limited to specific holders, not universal. Single-sided use only, reduces versatility. Coating may wear faster under extreme conditions.

Perfect For:

Accusize Industrial Tools GTN-3 inserts are perfect for machinists and metalworkers who need reliable tools for cutting and grooving. They work best on mild steel and stainless steel, making them ideal for professionals in manufacturing or metal fabrication.

Ready to Purchase?

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7. 3 Pack SPT025D2 THINBIT LITTLEBIT ‘S’ Series Parting Insert, Uncoated Carbide for Steel, cast Iron and Stainless Steel with Interrupted cuts

The 3 Pack SPT025D2 THINBIT LITTLEBIT ‘S’ Series Parting Insert is a powerful tool for cutting steel, cast iron, and stainless steel. It’s uncoated carbide and works best with interrupted cuts.

Use it for parting solid stock up to .400″ or tubing with walls up to .200″. It fits Small series toolholders and cuts close to the collet face or shoulder.

Pros	Cons
Minimizes material loss with narrow widths for efficient cutting. Perfect for thin walls and small parts, ensuring precise results. Handles steel, cast iron, and stainless with uncoated carbide durability. Cuts close to collet face, ideal for tight spaces.	No coating means shorter lifespan in tough cutting conditions. Limited to specific toolholders, reducing flexibility in use. Not for continuous cuts, only interrupted cuts allowed.

Perfect For:

This 3 Pack SPT025D2 THINBIT LITTLEBIT ‘S’ Series Parting Insert is perfect for machinists and metalworkers who need precise cuts on steel, cast iron, and stainless steel. It’s ideal for working with precious metals, thin tubing, and small parts.

Ready to Purchase?

View Price on Amazon (paid link)

8. THINBIT 3 Pack LGPT085HSR7R ‘L’ Series, Uncoated High Speed Steel, Parting Insert for Plastics, Composites, Abusive Cutting Conditions and Low RPM Cutting

THINBIT 3 Pack LGPT085HSR7R 'L' Series, Uncoated High Speed Steel, Parting Insert for Plastics, Composites, Abusive Cutting Conditions and Low RPM Cutting

The THINBIT 3 Pack LGPT085HSR7R is a high-speed steel parting insert designed for tough cutting jobs. It works well with plastics, composites, and low RPM cutting.

Narrow widths save material and reduce part bending. Use it for solid stock up to 1.000″ or tubing with walls up to .500″.

Pair it with Large series toolholders for best results. Works with RH straight or LH 90-degree holders.

Pros	Cons
Minimizes material loss with narrow widths for precise cuts. Perfect for plastics and composites under tough conditions. Handles low RPM cutting with uncoated high-speed steel. Versatile use with large series toolholders for various setups.	Limited to specific toolholders for proper use. Uncoated steel may wear faster in tough conditions. 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 precious metals.

Ready to Purchase?

View Price on Amazon (paid link)

9. 3 Pack SPT045D5 THINBIT LITTLEBIT ‘S’ Series Parting Insert, Uncoated Carbide for Non-Ferrous alloys, Aluminium, Plastic no Interrupted cuts

The 3 Pack SPT045D5 THINBIT LITTLEBIT ‘S’ Series Parting Insert is a specialized tool for cutting non-ferrous alloys, aluminium, and plastic. It’s uncoated carbide and works best for smooth, uninterrupted cuts.

This insert reduces material loss and is perfect for thin or small parts. Use it with Small series toolholders for precise parting up to 1.000″.

Pros	Cons
Minimizes material loss with narrow widths for efficient cutting. Perfect for precious metals and thin-walled parts. Cuts close to collet face or shoulder for precision. Uncoated carbide excels in non-ferrous alloys and plastics.	Not for interrupted cuts Needs Small series toolholders only Best on non‑ferrous materials only

Perfect For:

This 3 Pack SPT045D5 THINBIT LITTLEBIT ‘S’ Series Parting Insert is perfect for anyone working with non-ferrous alloys, aluminium, or 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)

10. ASZLBYM Lathe Turning Tools Slotted SPB26-3, Cutting Insert Lathe CNC SPB Grooving Cut-Off Tool with 12 pcs SP300 Carbide Inserts and 1pc SMBB1626 Grooving Parting Blade Plate

ASZLBYM Lathe Turning Tools Slotted SPB26-3, Cutting Insert Lathe CNC SPB Grooving Cut-Off Tool with 12 pcs SP300 Carbide Inserts and 1pc SMBB1626 Grooving Parting Blade Plate

The ASZLBYM Lathe Turning Tools set includes everything you need for precise cutting. It comes with a SPB26-3 grooving tool holder, 12 SP300 carbide inserts, and a SMBB1626 grooving blade plate. This kit is perfect for CNC lathe work.

The tools are made from high-quality materials. The SP300 inserts have a CVD coating for durability. The SMBB1626 holder is made of 40Cr steel, ensuring strength and reliability.

This set is ideal for stainless steel processing. It offers high precision, efficiency, and shock resistance. All parts come in a plastic container for safe and easy storage.

Pros	Cons
Strong and tough build Fast and smooth cutting High precision performance Safe and easy storage Great for steel work	Limited to stainless steel parts processing. No extra storage for inserts included. Carbide holder may wear over time.

Perfect For:

This ASZLBYM Lathe Turning Tools Set is perfect for anyone working with stainless steel parts. Whether you’re a hobbyist or a professional machinist, this kit offers high precision, efficiency, and durability for your CNC lathe projects.

Ready to Purchase?

View Price on Amazon (paid link)

Buying Guide

Thin parting inserts are key for clean, precise cuts. Pick the right one to save time and material.

Choosing the best thin parting insert can boost your cutting efficiency. Whether you’re working with metals, plastics, or composites, the right tool makes all the difference. Here’s what to consider:

Material Compatibility:
Match the insert to your material. Carbide works well for metals, while high-speed steel is great for plastics and composites.
Coating:
Coated inserts last longer and handle high speeds. Uncoated options are cost-effective for lighter tasks.
Width:
Narrow widths reduce waste and work well in tight spaces. Choose based on your part size.
Cutting Conditions:
For tough jobs or low RPMs, pick high-speed steel. Carbide is best for smooth, uninterrupted cuts.
Toolholder Compatibility:
Ensure the insert fits your toolholder. Check for Large or Small series compatibility.
Durability:
Look for durable materials like DURA-MAX carbide for long-lasting performance.
Precision:
Sharp edges and low cutting force ensure clean results. Ideal for thin-wall parts and small diameters.
Value:
Multi-packs offer great value. Consider sets with extra inserts for frequent use.

With these factors in mind, you’ll find the perfect thin parting insert for your needs.