Insert shape and size are specifications, not marketing. A trapezoid insert cuts at a defined angle; a bullnose insert absorbs impact; and the angle, radius, and dimensions determine how the insert fits your blade’s milled slots. Reading the spec correctly is the difference between a perfect fit and a production problem. The SENTHAI tungsten carbide insert options publishes the full size chart.
Carbide Insert Types
The catalog divides into trapezoid and bullnose families. Trapezoid inserts deliver a defined cutting edge; bullnose inserts add a rounded nose for impact and ice duty. Both are available in multiple sizes and angles.
Insert Sizes
Sizes are specified in millimeters for length, width, and thickness — for example, trapezoid inserts from 25.4mm x 16.14mm x 9.27mm down to compact 3.175mm configurations. Match dimensions to your milled slots exactly; tolerance mismatches cause assembly problems.
Angles and Radii
Trapezoid inserts carry a cutting angle (such as 25° or 40°) and a radius (R1.59 to R3.07). Bullnose inserts use a larger radius instead of an angle. These values define how the insert meets the surface.
Compatibility
Compatibility is dimensional: the insert must fit the blade’s slot, and the bond must survive the duty. Confirm shape, size, angle, and radius against your blade drawing before ordering.
How to Choose
Choose the shape by application, the size by slot dimensions, and the angle by cutting behavior. When in doubt, send the blade drawing to the supplier and let engineering confirm.
Trapezoid Angles and Radii Explained
A trapezoid insert’s angle sets how aggressively it cuts; the radius sets the cutting-edge profile. SENTHAI offers 25° and 40° trapezoids with matched radii, covering standard and aggressive cutting profiles.
Bullnose Inserts for Impact and Ice
Bullnose inserts use a smooth radius (such as R4.61) instead of a sharp angle, distributing impact and resisting chipping. They suit ice-heavy duty where impacts are frequent and edge toughness matters.
Reading the Size Chart
The chart lists shape, size (mm), angle, and radius per configuration. Read it left to right: shape defines geometry, size defines fit, angle and radius define cutting behavior. Always confirm the units before ordering.
Matching Inserts to Blade Design
The blade drawing defines the slot geometry; the insert must match it. Send the drawing or sample to the supplier, and engineering will confirm the correct shape, size, and configuration.
Custom Shapes from Drawings
Beyond standard sizes, SENTHAI manufactures custom-shaped carbide inserts to your drawings and specifications. Custom work covers unusual geometries and specialized configurations for OEM programs.
Frequently Asked Questions
How do I choose between trapezoid and bullnose inserts?
Trapezoid for standard cutting, bullnose for impact and ice duty. Match the shape to your application and blade design.
What do the angle and radius numbers mean?
Angle sets cutting aggressiveness; radius sets the edge profile. Both are specified per configuration on the size chart.
How do I know an insert will fit my blade?
Compare dimensions to your milled slots and confirm with the supplier. Send the drawing for engineering confirmation.
Are custom insert shapes available?
Yes — custom-shaped carbide inserts are manufactured to your drawings and specifications.
Specify the insert, not just the blade. Review the size chart on the carbide insert product page and send your drawings for fitment confirmation.