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WIDIA NEGATIVE INSERT

WIDIA, a brand with a history dating back to the 1920s and the development of the first sintered tungsten carbide cutting tools, is a recognized manufacturer of indexable turning inserts and tooling systems for metalworking. The WIDIA negative insert product line comprises a range of indexable turning inserts designed for use with negative rake tool holders. These inserts are characterized by their negative geometry, which provides strong cutting edges suitable for heavy-duty machining, interrupted cuts, and work on harder materials. The product family includes square (S) and diamond (D) shaped inserts, with common geometries such as SNMG (square) and CNMG, DNMG, VNMG (diamond). These inserts are available in various sizes and chipbreaker designs, including the GEO UR series, which is engineered for general-purpose turning operations. Key specifications include insert size designations like SNMG432UR (equivalent to SNMG120408UR) and CNMG431UR (equivalent to CNMG120404UR), which define the insert's inscribed circle diameter, thickness, and nose radius. The inserts are manufactured to standard tolerances and are compatible with a wide range of workpiece materials, including steel, stainless steel, cast iron, and non-ferrous alloys. 3G Electric supplies a selection of WIDIA negative inserts, covering multiple SKUs with different geometries and sizes. The inventory includes both square and diamond inserts, with manufacturer part numbers such as 6867891, 6942277, 6867869, and 6867867. These inserts are typically used in turning, facing, and boring operations on CNC lathes and manual machines. The negative insert design allows for multiple cutting edges per insert, improving tool life and cost efficiency. 3G Electric supports procurement by offering these inserts with logistics support for global shipping, enabling plant engineers and maintenance managers to source replacement tooling without geographic constraints. The inserts are supplied as individual units, and the available specifications allow buyers to match inserts to their specific tool holders and machining requirements.

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About WIDIA NEGATIVE INSERT

WIDIA, a brand with a history dating back to the 1920s and the development of the first sintered tungsten carbide cutting tools, is a recognized manufacturer of indexable turning inserts and tooling systems for metalworking. The WIDIA negative insert product line comprises a range of indexable turning inserts designed for use with negative rake tool holders. These inserts are characterized by their negative geometry, which provides strong cutting edges suitable for heavy-duty machining, interrupted cuts, and work on harder materials. The product family includes square (S) and diamond (D) shaped inserts, with common geometries such as SNMG (square) and CNMG, DNMG, VNMG (diamond). These inserts are available in various sizes and chipbreaker designs, including the GEO UR series, which is engineered for general-purpose turning operations. Key specifications include insert size designations like SNMG432UR (equivalent to SNMG120408UR) and CNMG431UR (equivalent to CNMG120404UR), which define the insert's inscribed circle diameter, thickness, and nose radius. The inserts are manufactured to standard tolerances and are compatible with a wide range of workpiece materials, including steel, stainless steel, cast iron, and non-ferrous alloys. 3G Electric supplies a selection of WIDIA negative inserts, covering multiple SKUs with different geometries and sizes. The inventory includes both square and diamond inserts, with manufacturer part numbers such as 6867891, 6942277, 6867869, and 6867867. These inserts are typically used in turning, facing, and boring operations on CNC lathes and manual machines. The negative insert design allows for multiple cutting edges per insert, improving tool life and cost efficiency. 3G Electric supports procurement by offering these inserts with logistics support for global shipping, enabling plant engineers and maintenance managers to source replacement tooling without geographic constraints. The inserts are supplied as individual units, and the available specifications allow buyers to match inserts to their specific tool holders and machining requirements.

Common Applications

  • Heavy-duty turning of steel shafts — WIDIA SNMG432UR negative inserts for roughing operations
  • Interrupted cut machining of cast iron components — WIDIA CNMG431UR inserts with negative geometry
  • General-purpose turning of stainless steel flanges — WIDIA DNMG150608UR diamond inserts
  • Boring operations on alloy steel housings — WIDIA VNMG12T304 negative inserts for internal turning
  • Facing of large diameter steel plates — WIDIA SNMG433UR inserts for stable cutting at high depths
  • Production turning of non-ferrous bushings — WIDIA CNMG120404UR inserts for consistent surface finish

Frequently asked questions

Common questions about WIDIA NEGATIVE INSERT from 3G Electric.

What is the difference between WIDIA negative inserts and positive inserts?

WIDIA negative inserts have a 0° clearance angle on the cutting edge, requiring a negative rake tool holder. They provide stronger cutting edges than positive inserts, making them suitable for heavy-duty machining, interrupted cuts, and harder materials. Negative inserts typically have more cutting edges (up to 8 for square inserts) compared to positive inserts, which can reduce tooling costs per edge. However, they require higher cutting forces and are less effective for light finishing cuts.

What do the designations SNMG432UR and SNMG120408UR mean for WIDIA negative inserts?

These designations follow the ISO standard for indexable inserts. SNMG indicates a square insert with a 0° clearance angle (negative), a tolerance class, and a chipbreaker design. The numbers 432 or 120408 define the insert size: the first digit(s) indicate the inscribed circle diameter (e.g., 4 = 1/2 inch or 12 mm), the second digit indicates thickness (e.g., 3 = 3/16 inch or 4.76 mm), and the third digit indicates nose radius (e.g., 2 = 1/32 inch or 0.4 mm). The UR suffix denotes the chipbreaker geometry for general-purpose turning.

Are WIDIA negative inserts compatible with other brands' tool holders?

WIDIA negative inserts are manufactured to standard ISO dimensions, so they are generally compatible with tool holders from other brands that accept the same insert shape and size. For example, an SNMG432 insert will fit any tool holder designed for SNMG432 inserts, regardless of the holder manufacturer. However, chipbreaker performance may vary, and it is advisable to verify the insert's clearance angle and seating surface compatibility with the specific holder.

What materials can be machined with WIDIA negative inserts from the GEO UR series?

The WIDIA GEO UR series is designed for general-purpose turning and is suitable for a range of workpiece materials, including carbon steel, alloy steel, stainless steel, cast iron, and non-ferrous metals. The negative geometry provides edge strength for interrupted cuts and harder materials. For optimal performance, the cutting parameters (speed, feed, depth of cut) should be adjusted based on the specific material grade and hardness. Consult the manufacturer's recommendations for each insert grade.

How many cutting edges does a WIDIA square negative insert have?

A WIDIA square negative insert, such as the SNMG432UR, typically has 8 cutting edges. Because the insert has a negative geometry with a 0° clearance angle, it can be indexed to use both sides and all four corners, providing 8 usable edges. This design improves tool life and reduces cost per edge compared to positive inserts, which often have fewer edges. Diamond-shaped inserts like CNMG or DNMG have 4 cutting edges.

Does 3G Electric supply WIDIA NEGATIVE INSERT products?

Yes — 3G Electric (S) Pte. Ltd. supplies WIDIA NEGATIVE INSERT products. We stock the WIDIA NEGATIVE INSERT catalog and supply genuine factory-original products with full manufacturer warranty and technical support.