Grooving Part Off Holders are essential tooling for lathes, designed to create precise grooves on workpieces or to cleanly separate finished parts from stock material. They are critical for efficiency in various metalworking operations, from automotive components to intricate custom parts. Products were evaluated based on shank size, insert compatibility, holder material, overall stability, user reviews, and feature analysis.
ASZLBYM Lathe Grooving Tool Holder Grooving Cut-Off Tool Holder MGEHR1616-2.5 With 11pcs MGMN250-M Indexable Carbide Grooving Inserts
$18.59
This ASZLBYM holder offers a versatile 16mm shank and a common MGMN250-M insert size, balancing rigidity with broader application suitability.
View on Amazon
ASZLBYM Lathe Grooving Tool Holder Grooving Cut-Off Tool Holder MGEHR1212-1.5 With 11pcs MGMN150-G Indexable Carbide Grooving Inserts
$18.99
The ASZLBYM MGEHR1212-1.5 provides a complete kit with a smaller 12mm shank and 11 inserts, ideal for lighter tasks or smaller machines.
View on Amazon
OSCARBIDE 3/4"Indexable Lathe Grooving Parting Holder QA12R-30 Heavy Duty Right -Hand Nickel PlatedCut Off Tool with Carbide Insert, 1pcs
$42.99
The OSCARBIDE 3/4" holder is engineered for heavy-duty applications, featuring a robust integral shank and a GTN-3 insert stop for enhanced precision.
View on Amazon
- Package Dimensions: 3 L x 6 H x 1 W (inches)
- Package Weight: 0.5 pounds
- Country of Origin : China
- Part Number: 3900-5468
- Package : You will receive 1pc 12mm shank diameter MGEHR1212-1.5 carbide lathe turning tool holder , 11pcs MGMN150-G grooving carbide turning inserts.
- Material : The MGEHR1212-1.5 lathe turning tool holder material is 40Cr steel, it has the characteristics of durability, sturdiness and stability, and good anti-rust performance. The MGMN150-G grooving inserts cutter material is carbide, and the coating...
- MGMN150-G carbide turning insert size : thickness: 1.2mm ≈ 0.047", length : 16mm ≈ 0.629" , height : 3.5mm ≈ 0.137" , P=7 degree.
- Application : Suitable for wide and deep groove machining.The Grooving Cut-Off Tool Holder insert can be used for cutting stainless steel, iron pipe, copper pipe, aluminum pipe, non-metallic pipe, plate and other materials.
- Easy to store : the grooving tool holder and carbide grooving inserts are packed in a plastic container, safe and easy to store, please rest assured to buy!
- Adopting for precision grinding technology, the repeat positioning accuracy is ≤0.005mm, the stability of the processing process and the for surface finish of the workpiece.
- Adapting to BT/HSK/CAT toolholder system (configured by model), supporting φ16-26mm tool installation, covering milling cutters, drills, boring cutters and other types of CNC tools.
- The tool holder body is made of alloy steel quenching treatment, with internal reinforcement rib design, vibration resistance is improved by 30%, suitable for heavy cutting and high speed conditions.
- Integrated internal cooling channel (optional), directly delivering coolant to the tool tip, reducing cutting temperature, extending tool life and improving processing efficiency.
- Equipped with hydraulic or mechanical locking mechanism (depending on model), tool change time is ≤3 seconds, compatible with mainstream CNC machine tool automatic tool changer (ATC).
- Package : You will receive 1pc 12mm shank diameter MGEHR1212-2 carbide lathe turning tool holder , 11pcs MGMN200-G grooving carbide turning inserts.
- Material : The MGEHR1212-2 lathe turning tool holder material is 40Cr steel, it has the characteristics of durability, sturdiness and stability, and good anti-rust performance. The MGMN200-G grooving inserts cutter material is carbide, and the coating is...
- MGMN200-G carbide turning insert size : thickness: 1.6mm ≈ 0.063", length : 16mm ≈ 0.629" , height : 3.5mm ≈ 0.137" , P=7 degree.
- Application : Suitable for wide and deep groove machining.The Grooving Cut-Off Tool Holder insert can be used for cutting stainless steel, iron pipe, copper pipe, aluminum pipe, non-metallic pipe, plate and other materials.
- Easy to store : the grooving tool holder and carbide grooving inserts are packed in a plastic container, safe and easy to store, please rest assured to buy!
- Package : You will receive 1pc 16mm shank diameter MGEHR1616-2 carbide lathe turning tool holder , 11pcs MGMN200-G grooving carbide turning inserts.
- Material : The MGEHR1616-2 lathe turning tool holder material is 40Cr steel, it has the characteristics of durability, sturdiness and stability, and good anti-rust performance. The MGMN200-G grooving inserts cutter material is carbide, and the coating is...
- MGMN200-G carbide turning insert size : thickness: 1.6mm ≈ 0.063", length : 16mm ≈ 0.629" , height : 3.5mm ≈ 0.137" , P=7 degree.
- Application : Suitable for wide and deep groove machining.The Grooving Cut-Off Tool Holder insert can be used for cutting stainless steel, iron pipe, copper pipe, aluminum pipe, non-metallic pipe, plate and other materials.
- Easy to store : the grooving tool holder and carbide grooving inserts are packed in a plastic container, safe and easy to store, please rest assured to buy!
- Lather Parting tool holder’s size：ZQ1616R02, Shank Size (B x H): 5/8" x 5/8" Overall Length (L): 3.9" , Screw size: M5x23 Wrench size: L4.0
- Lathe cut off tool Insert’s size: SP200, Tin Coated Carbide Insert, grooving width: 2mm
- GTN-2 insert stop assures accuracy of center height and precise depth of cut
- Simple set-up with one piece integral shank holder adapts easily to any machine type and turret configuration
- Package: 1 x ZQ1616R02 mini lathe parting tool + 10pcs SP200 lathe grooving tool carbide inserts
- Inserts' model name: SP300，Cutting width:3mm/0.118in，Carbide inserts with CVD Coating. Coating endows inserts strong impact resistance, good versatility with high precision, high finish and high wear resistance；
- The carbide inserts with TIN coating,good wear-resistance, sharp and non-stick blade;
- 5/8 Shank ZQ1616R-2/ ZQ1616R-3 Indexable Lathe Grooving Parting Holder：40CrMo Grooving Slotting Tool Cut Off Tool holders, 5/8in shank dia ,and 3.94in length, Screw compression type, quick and easy installation and removal.Quenching and hardening...
- GTN-3(SP300) Insert Applicaiton: Suitable for Stainless steel parts processing;
- Package includes: 10pcs SP200/300 Carbide inserts + 1pc ZQ1616R-2/3 Grooving Cut-Off Tool
- Negative rake tool holder tool
- Left Handed
- Easy to use
- Quality material
- Durable and long lasting
- 【Material】This SPB326 SPB26-3mm Grooving Parting Blade SMBB2026 Cut off Block Tool holder is made of material, durability and longevity.
- 【Superb processing effect】With its good toughness and hardness, this tool shows a perfect processing effect, providing efficient and precise cutting.
- 【Versatile applicability】Designed specifically for SP300 for blades (not included), this slotting is suitable for various applications and can meet different cutting needs.
- 【Compact and convenient】The groove width of this tool is 3mm, while the blade height is 26mm, providing excellent control and for . The total length of the tool is 110mm, making it compact and easy to handle.
- 【Complete package】This product includes 1 SPB326 board, 1 SMBB2026 Block Tool Holder, and 1 wrench, that you have everything you need for immediate use and convenient installation.
This article is part of our complete guide Tools & Home Improvement — browse all our comparisons and buying guides.
Last update on 2026-07-16 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Grooving Part Off Holders
Shank Size and Machine Compatibility
The shank size of a grooving part off holder is paramount for ensuring proper fitment and stability in your lathe's tool post. Holders like the ASZLBYM MGEHR1212-1.5 typically feature a 12mm shank, suitable for smaller benchtop lathes, while the ASZLBYM MGEHR1616-3 offers a more robust 16mm shank for increased rigidity on medium-sized machines. For heavy-duty applications, a 3/4-inch shank, as seen with the OSCARBIDE holder, provides maximum stability, though it requires a compatible tool post. Selecting an incorrect shank size can lead to chatter, poor surface finish, or even tool damage.
Insert Type and Grooving Width
The choice of indexable carbide insert is crucial for achieving the desired groove width and material removal rate. ASZLBYM kits often include MGMN series inserts, such as the MGMN150-G (1.2mm thickness) for fine grooving or the MGMN300-M (2.35mm thickness) for wider, more aggressive cuts. The specific 'G' or 'M' designation can indicate chipbreaker geometry, impacting performance across various materials. Matching the insert thickness to your application's requirements is vital; using an overly wide insert for a shallow groove can lead to unnecessary material waste and increased cutting forces.
Holder Material and Design
The material and construction of the tool holder directly influence its durability and vibration dampening capabilities. Many holders, including the ASZLBYM series, are constructed from 40Cr steel, known for its hardness and wear resistance, which contributes to a longer tool life. More specialized options, like the SMBB series from TreasureCave, may feature alloy steel quenching treatment and internal reinforcement ribs. This advanced design is specifically engineered to minimize vibration during deep grooving or parting operations, resulting in improved surface finish and extended insert life in demanding applications.
Precision and Setup Features
Precision features can significantly enhance the accuracy and repeatability of your grooving and parting operations. The OSCARBIDE holder, for example, integrates a GTN-3 insert stop. This mechanism ensures consistent center height and precise cutting depth, which is critical for maintaining tight tolerances across multiple parts. Similarly, block tool holders like the TreasureCave SMBB series emphasize precision grinding technology, leading to repeat positioning accuracy of ≤0.005mm. These features reduce setup time and common machining errors, particularly in production environments.
Pros & Cons
ASZLBYM Lathe Grooving Tool Holder Grooving Cut-Off Tool Holder MGEHR1212-1.5 With 11pcs MGMN150-G Indexable Carbide Grooving Inserts
Pros
- Compact 12mm shank suitable for smaller lathes and lighter cuts.
- Comes with a generous supply of 11 MGMN150-G inserts, offering good value.
- 40Cr steel construction provides a durable and robust holder body.
Cons
- Limited to a 1.2mm grooving width, which may not suit all applications.
- 12mm shank may exhibit less rigidity compared to larger holders for heavier material removal.
ASZLBYM Lathe Grooving Tool Holder Grooving Cut-Off Tool Holder MGEHR1616-3 With 11pcs MGMN300-M Indexable Carbide Grooving Inserts
Pros
- 16mm shank diameter offers increased stability and rigidity over smaller holders.
- Includes MGMN300-M inserts, providing a wider 2.35mm grooving capability for more aggressive cuts.
- Constructed from durable 40Cr steel, ensuring prolonged tool life under typical use.
Cons
- The wider 2.35mm grooving width might be excessive for fine detail or minimal material removal tasks.
- 16mm shank size may not be compatible with all compact or hobbyist lathe tool posts.
OSCARBIDE 3/4"Indexable Lathe Grooving Parting Holder QA12R-30 Heavy Duty Right -Hand Nickel PlatedCut Off Tool with Carbide Insert, 1pcs
Pros
- Heavy-duty 3/4" shank provides maximum rigidity for demanding parting operations.
- Features a GTN-3 insert stop, enhancing accuracy for center height and cutting depth.
- Integral shank design simplifies setup and adapts well to various machine types.
Cons
- Requires specific GTN-3 inserts, which may necessitate dedicated sourcing.
- The 3/4" shank might be oversized for smaller lathes, limiting compatibility.
Common Mistakes to Avoid
Ignoring Shank Size Compatibility
Users frequently overlook the importance of matching the holder's shank size to their lathe's tool post. Attempting to use a 12mm shank holder, such as the ASZLBYM MGEHR1212-1.5, in a tool post designed for 3/4" holders like the OSCARBIDE can lead to instability and chatter. Conversely, forcing an oversized holder into a smaller tool post is not feasible and can damage equipment. Always verify your machine's specifications against the holder's dimensions.
Selecting the Wrong Insert Width
A common error involves choosing an insert with an inappropriate grooving width for the task. For instance, using a 1.2mm MGMN150-G insert when a 2.35mm MGMN300-M insert (as supplied with ASZLBYM MGEHR1616-3) would be more efficient for a wider groove, can result in excessive passes or premature insert wear. Conversely, an overly wide insert for a small groove can create unnecessary material waste and increased cutting forces.
Underestimating the Importance of Cutting Depth
Failing to consider the maximum cutting depth capability of the holder can lead to operational limitations. The OSCARBIDE 3/4" holder, for example, specifies a maximum cutting depth of 1.18". If your workpiece requires a deeper cut, a holder with insufficient reach will necessitate multiple setup changes or an unsuitable cutting approach, compromising efficiency and finish quality.
Overlooking Holder Rigidity and Design
When tackling tough materials or deep grooving, neglecting the holder's inherent rigidity can lead to poor performance. While 40Cr steel holders like those from ASZLBYM offer good durability, specialized designs, such as the TreasureCave SMBB series with its alloy steel quenching treatment and internal reinforcement rib design, are engineered for superior vibration damping. Overlooking these design aspects can result in excessive chatter, poor surface finishes, and reduced insert life, especially in demanding applications.
