Product Overview
SinoDiam CBN-A20 Amber Regular Cubic Boron Nitride is a synthetic CBN abrasive grit positioned for manufacturers of vitrified-bond, metal-bond and electroplated grinding tools used on suitable hardened ferrous materials.
CBN-A20 is characterized in the SinoDiam product catalogue by its amber-colored, relatively regular crystal morphology and high-toughness grade positioning. These characteristics make it an evaluation candidate where grain integrity, resistance to premature fracture and effective abrasive retention are important to the finished tool.
Unlike a resin-bond-focused grade such as CBN-A10, CBN-A20 is positioned for several bond-manufacturing systems. However, vitrified, metal and electroplated tools have different bonding mechanisms, manufacturing temperatures and abrasive-retention requirements. Compatibility must be established for the individual process rather than assumed from the product designation.
Cubic boron nitride is widely used in grinding many hardened steels and suitable ferrous alloys. Compared with diamond, CBN generally offers more favorable chemical behavior in many steel-grinding conditions. The choice must still consider workpiece chemistry, hardness, heat treatment, grinding temperature and tool design.
The relatively regular crystal shape of CBN-A20 may be evaluated where consistent abrasive contact and grain strength are relevant. Actual grinding behavior is also determined by particle-size distribution, grain morphology, wheel concentration, bond properties, dressing and operating conditions.
In vitrified CBN tools, the grain must tolerate the selected firing process and interact appropriately with the ceramic bond. In metal-bond tools, crystal retention depends on matrix chemistry and sintering conditions. In electroplated tools, retention is governed by the deposited metal structure, abrasive exposure and the plating process.
CBN-A20 may be evaluated for grinding selected hardened tool steels, alloy steels, high-speed steel components, die steels and other suitable ferrous workpieces. Stainless steel applications require further evaluation of material grade, hardness, loading and grinding conditions.
The historical SinoDiam catalogue references 50/60 through 325/400 mesh CBN-A20 abrasive. Current available fractions, particle-size distribution, crystal toughness, inspection methods and ordering specifications should be confirmed before purchase.
For grade selection and quotation, please provide the target workpiece, required CBN mesh fraction, bond system, manufacturing process, grinding parameters, expected quantity and delivery destination.
Technical Specifications
CBN-A20
Amber Regular Cubic Boron Nitride
Synthetic Cubic Boron Nitride
SinoDiam
Amber
Relatively Regular Crystals
High — Catalogue Classification
Vitrified / Metal / Electroplated
50/60–325/400 Mesh — Verify
Confirm Current Size List
Confirm Grading Standard & Limits
Request Grade-Specific Data
Request Applicable Test Results
Review Actual Particle Morphology
Selected Hardened & Alloy Steels
Tool Steel / HSS / Suitable Die Steel
Verify Ceramic Bond & Firing Conditions
Verify Matrix & Sintering Process
Verify Plating & Grain Retention
Determine from Finished Tool & Process
Application-Specific Requirements
Confirm Through Grinding Trials
Request Current Product Specification
Amber color, regular morphology and high-toughness positioning are catalogue descriptions. Current available mesh sizes, quantitative toughness and finished-tool performance must be confirmed using grade-specific specifications and application testing. No universal grinding pressure, RPM, surface finish or tool-life improvement is guaranteed.
Amber Regular CBN Crystal Structure & Grinding Characteristics
CBN-A20 is positioned for tool systems where relatively regular crystal geometry and grain toughness are relevant. The abrasive must be evaluated together with its bond system and operating environment.
Regular Amber CBN Crystals
CBN-A20 is described as having relatively regular amber crystals. Actual grain geometry, edge characteristics and morphology should be assessed using representative particles from the requested size fraction.
High-Toughness Grade Positioning
The catalogue positions A20 as a higher-toughness amber grade. Resistance to crystal fracture depends on size, defects, internal structure, loading and the selected test method.
Resistance to Premature Fracture
Relatively tough CBN grains can be evaluated for grinding conditions where abrasive integrity matters. Excessively low grain fracture may also affect cutting-edge renewal in some wheel systems.
Mechanical Retention & Exposure
Effective tool performance requires appropriate grain retention while maintaining usable abrasive exposure. Bond chemistry, abrasive concentration and tool structure remain important.
Manufacturing Temperature Compatibility
Vitrified and metal-bond tool production may expose grains to demanding thermal conditions. Actual compatibility depends on temperature, time, atmosphere and bond constituents.
Application-Dependent Cutting Behavior
Grinding forces, workpiece quality, wheel wear and dressing requirements result from interactions among the CBN grade, bond, grit size and operating conditions.
Does High Toughness Always Mean Better Grinding?
No. Tougher grains may resist premature fracture, but some grinding processes benefit from controlled abrasive breakdown and cutting-edge renewal. The appropriate balance depends on the workpiece, bond system, grit size, wheel structure and grinding load.
CBN-A20 Bond Compatibility: Vitrified, Metal & Electroplated
CBN-A20 is positioned for three important abrasive-tool manufacturing systems. Each bond should be evaluated using its own manufacturing process and finished-tool requirements.
Vitrified-Bond CBN
Ceramic-bond grinding wheels require appropriate grain strength, bond wetting and thermal-process compatibility. Evaluate the ceramic formulation, firing cycle, atmosphere and abrasive retention.
Metal-Bond CBN
Sintered metal-bond tools require the CBN grain to interact appropriately with the selected matrix. Assess metal composition, manufacturing temperature, abrasive concentration and exposure.
Electroplated CBN
Electroplated grinding tools rely on deposited metal to retain abrasive grains. Plating thickness, grain protrusion, surface condition and nickel-deposit quality are key evaluation factors.
Bond-System Engineering Considerations
Vitrified Bond: Firing & Porosity
Determine the suitability of the CBN for the ceramic composition, firing conditions, wheel porosity and required grinding behavior. Abrasive compatibility should be verified after manufacturing.
Metal Bond: Matrix & Sintering
Evaluate matrix chemistry, pressing or sintering method, grain distribution and exposure. A more regular crystal shape does not automatically establish chemical bonding or a specific retention strength.
Electroplated Bond: Nickel Retention
Confirm the abrasive grit size, plating bath chemistry, deposit geometry and exposed grain height. The nickel coating on the tool is distinct from any coating intentionally applied to the CBN particles themselves.
Tool Design & Grinding Conditions
Bond strength, chip space, coolant access, dressing and grinding load influence wheel performance. A20 should be validated in the finished-tool system rather than only through particle appearance.
Multi-Bond Positioning Is Not Universal Compatibility
Although CBN-A20 is positioned for vitrified, metal and electroplated tools, approval for one bond formulation does not establish suitability for every ceramic firing cycle, metal matrix or nickel-plating process. Material trials and the tool manufacturer’s specifications remain necessary.
CBN-A20 Mesh Size Selection for Grinding Tools
The historical SinoDiam CBN-A20 catalogue references mesh fractions ranging from 50/60 to 325/400. These size windows can guide preliminary engineering discussions, but available fractions and grading limits must be verified for the actual product.
50/60 Mesh
Material-Removal Evaluation
Consider for suitable grinding-tool designs where larger abrasive particles are acceptable. Confirm workpiece geometry, cutting forces, bond retention and finish requirements.
120/140 Mesh
General Precision Grinding
Evaluate where an intermediate grit fraction may provide an appropriate balance between abrasive exposure, material removal and surface requirements.
325/400 Mesh
Fine Grinding Evaluation
Consider for selected finer grinding operations, provided the bond system, grain exposure, wheel structure and dressing method meet the process requirements.
Technical Requirements for Mesh Selection
Grading Standard & PSD
Confirm the grading convention and particle-size distribution. Nominally equivalent mesh designations may differ under different standards or inspection procedures.
Particle Toughness by Fraction
Crystal fracture and mechanical behavior may vary across grit sizes. Compare grade-specific toughness or friability data where required.
Bond Retention & Grain Protrusion
Grain exposure and retention must be matched to vitrified, metal or electroplated tool construction. A suitable size for one bond may not suit another.
Surface Finish & Grinding Efficiency
Finished-surface quality depends on grit size, dressing, workpiece material, machine stiffness, coolant and operating conditions. No fixed roughness value can be assigned to the abrasive grade alone.
Choosing a Mesh Fraction for Vitrified CBN Wheels
The historical product description mentions intermediate fractions such as 120/140 through 230/270 for precision vitrified grinding. These are not universally optimal sizes. Select the fraction according to the wheel design, desired surface condition and verified performance on the intended workpiece.
Historical size references do not establish stock, availability or exact PSD. Request the current CBN-A20 size specification before finalizing a tool formulation.
Recommended Applications of CBN-A20
CBN-A20 may be evaluated for precision grinding of suitable hardened ferrous materials, especially where vitrified, metal or electroplated CBN tools are used.
Hardened Tool Steel Grinding
Evaluate CBN-A20 in appropriate grinding tools for hardened tool steel components. Consider workpiece hardness, alloying elements, grinding forces, thermal damage and surface integrity.
High-Speed Steel Tools
Selected HSS cutting tools may require precision grinding using CBN abrasives. Match grit size, bond system, wheel geometry and dressing to the required cutting-edge quality.
Alloy Steel Components
Evaluate suitable alloy steel parts where material hardness and manufacturing conditions justify CBN grinding. Confirm the wheel and abrasive grade for the intended grinding operation.
Vitrified CBN Grinding Wheels
For selected vitrified-bond wheel applications requiring evaluation of crystal integrity, abrasive retention, firing compatibility, porosity and wheel conditioning.
Metal-Bond Precision Tools
Metal-bond CBN tools can be evaluated where the matrix design and grinding conditions require a suitable synthetic CBN abrasive. Confirm metal-matrix and processing compatibility.
Electroplated Profile Grinding
Consider CBN-A20 for appropriate single-layer electroplated grinding tools. Grain protrusion, plating quality and process load are essential factors for profile retention.
These descriptions identify candidate applications, not approved operating parameters. Stainless steel, softer ferrous alloys and specialized heat-resistant materials require workpiece-specific evaluation before CBN-A20 is selected.
CBN-A20 vs. A10, B10 & B20 — Technical Grade Comparison
SinoDiam offers four familiar CBN grit products. They differ in catalogue-described crystal morphology, toughness and intended grinding-tool applications.
| Product Grade | Crystal Description | Main Evaluation Focus |
|---|---|---|
| CBN-A10 | Amber · Irregular · Medium Toughness | Selected resin-bond grinding wheels and controlled grain-fracture behavior |
| CBN-A20 | Amber · Regular · High-Toughness Positioning | Selected vitrified, metal and electroplated grinding tools |
| CBN-B10 | Black · Friable | Resin-bond grinding with grain-fracture and cutting-edge renewal evaluation |
| CBN-B20 | Bright Black · Blocky · Higher-Toughness Positioning | Selected higher-load grinding and compatible multi-bond tools |
The table compares catalogue positioning. It does not establish measured toughness values, uniform quality rankings or guaranteed tool performance. Amber and black CBN grades should be qualified with their actual grit specifications and bond systems.
How to Select CBN-A20 for Grinding Tool Manufacturing
Start with the complete grinding application and bond-manufacturing process. A20 is a material candidate, not a substitute for engineering validation of the finished tool.
Identify the Workpiece
Specify steel grade, hardness, heat-treatment condition, geometry, stock-removal requirements and target surface integrity.
Confirm the Bond System
Identify vitrified, metal or electroplated construction. Describe firing, sintering or plating conditions and the intended grain-retention mechanism.
Select the CBN Grit Specification
Define mesh size, grading requirements, crystal toughness, abrasive concentration and any special morphology or cleanliness requirements.
Validate the Finished Tool
Evaluate grinding forces, wheel wear, dressing behavior, dimensional accuracy, burn risk, surface condition and process economics.
Grinding RPM Is a Tool-System Parameter
Safe and effective operating speed depends on wheel diameter, construction, machine capabilities, rated maximum speed, guarding and the relevant safety standards. CBN-A20 particle toughness does not establish a universal safe spindle RPM or grinding pressure. Follow the finished-tool manufacturer’s rated operating limits.
SinoDiam CBN Grade Selection
Review all four SinoDiam CBN grades to select an appropriate starting point according to crystal characteristics, bond system and grinding requirements.
Current Product
Current Grade · Amber Regular
CBN-A20 — Vitrified, Metal & Electroplated CBN
Amber-colored, relatively regular CBN crystals with high-toughness catalogue positioning for selected vitrified, metal and electroplated grinding-tool systems.
Primary selection focus: grain integrity, bond compatibility and finished-tool performance.
Explore Other CBN Grades
CBN-A10 →
Medium-toughness amber irregular CBN positioned for selected resin-bond grinding tools.
CBN-B10 →
Friable black CBN for selected resin-bond applications where controlled grain-fracture behavior is relevant.
CBN-B20 →
Blocky black CBN positioned for evaluating higher-load grinding and suitable multi-bond applications.
The existing CBN-B20 product URL currently uses /product/cnb-b20/. This link intentionally preserves the live address. Any future slug correction should use an appropriate permanent redirect.
Frequently Asked Questions — CBN-A20
1. What is SinoDiam CBN-A20?
CBN-A20 is SinoDiam’s amber-colored cubic boron nitride abrasive with relatively regular crystal morphology and high-toughness grade positioning. It is primarily evaluated for vitrified, metal and electroplated grinding-tool systems.
2. What does Amber Regular CBN mean?
Amber describes the crystal color, while regular refers to the general shape of the particles. These attributes are useful catalogue identifiers but do not independently establish toughness, purity or grinding performance.
3. Why is CBN-A20 positioned for vitrified-bond grinding wheels?
Its high-toughness catalogue positioning makes it a candidate for certain vitrified grinding systems. The actual suitability depends on bond composition, firing atmosphere, processing temperature, wheel structure and abrasive retention.
4. Can CBN-A20 be used in metal-bond grinding tools?
Metal bond is an intended evaluation direction for A20. Compatibility depends on matrix chemistry, sintering conditions, grain exposure and tool design. The final formulation must be qualified.
5. What makes CBN-A20 relevant to electroplated tools?
Relatively regular CBN crystals can be evaluated in nickel-electroplated tools. Actual retention depends on plating thickness, deposited metal quality, particle exposure and working conditions. Crystal shape alone does not guarantee anchoring.
6. Is CBN-A20 suitable for resin-bond wheels?
The primary catalogue positioning is vitrified, metal and electroplated systems. Resin-bond suitability should be assessed separately; CBN-A10 and CBN-B10 are more directly positioned for selected resin-bond applications.
7. Which workpiece materials can CBN-A20 grind?
Potential applications include selected hardened tool steels, alloy steels, HSS components and suitable ferrous workpieces. Actual suitability depends on workpiece material, hardness, geometry and grinding process.
8. Is CBN-A20 appropriate for stainless steel grinding?
Not universally. Different stainless steels vary in hardness, structure and grinding behavior. CBN may be appropriate for selected applications, but grade, bond, wheel construction and process economics require evaluation.
9. What mesh sizes are available for CBN-A20?
The historical SinoDiam catalogue references fractions from 50/60 through 325/400 mesh. Actual size availability, PSD and grading limits must be confirmed for the requested product specification.
10. What is the difference between CBN-A10 and CBN-A20?
A10 is described as an amber irregular, medium-toughness grade primarily positioned for resin bonds. A20 is described as a more regular amber, higher-toughness grade with vitrified, metal and electroplated applications. Neither is a universal substitute for the other.
11. Does CBN-A20 guarantee a 25% improvement in tool life?
No universal tool-life improvement is established. Finished-tool life depends on bond design, particle size, abrasive loading, workpiece, coolant and operating conditions. Comparative testing is required.
12. Does CBN-A20 guarantee surface roughness Ra ≤1.2 µm?
No. Surface roughness is an outcome of the full grinding process, including wheel design, grit fraction, dressing, workpiece and machine conditions. It cannot be guaranteed by the CBN grain designation alone.
13. Is 6,000 RPM a safe maximum operating speed for CBN-A20 wheels?
No universal RPM limit can be assigned to loose CBN abrasive grain. The finished wheel must have its own rated maximum operating speed, taking account of wheel diameter, construction, equipment and applicable safety requirements.
14. Does high toughness always provide better grinding results?
No. Higher grain toughness can help resist premature fracture, but controlled grain breakdown may be desirable in some applications. The correct balance depends on the bond, workpiece and operating conditions.
15. What is the difference between CBN-A20 and CBN-B20?
CBN-A20 is positioned as an amber, relatively regular, high-toughness grade. CBN-B20 is a bright black, blocky grade positioned for selected higher-load conditions. Actual performance differences require grade-specific measurements and grinding trials.
16. Can CBN-A20 replace a different manufacturer’s CBN grade?
Not based on a matching mesh size or color alone. Compare abrasive morphology, particle-size distribution, toughness, purity and bond compatibility, then validate through controlled finished-tool tests.
17. Is CBN-A20 supplied in coated or special surface-treated grades?
Any coated or specially surface-treated variant must be confirmed as a separate product specification. The standard CBN-A20 designation does not automatically imply a nickel or other surface coating.
18. What information is required for a CBN-A20 quotation?
Please provide the required mesh fraction, bond system, tool manufacturing method, workpiece material and hardness, grinding conditions, estimated quantity and delivery destination. Existing abrasive data or test results can help with grade comparison.
SINODIAM INTERNATIONAL · CBN ABRASIVE TECHNICAL SUPPORT
Request CBN-A20 Amber Regular CBN Specifications & Quotation
Looking for amber, relatively regular cubic boron nitride abrasive grit for vitrified, metal-bond or electroplated grinding tools used on hardened steels and suitable ferrous components?
Share your required mesh fraction, bond composition, manufacturing process, workpiece material and hardness, target grinding conditions, estimated order quantity and delivery destination.
SinoDiam can discuss CBN-A20 grade specifications and the technical information required to evaluate crystal toughness, particle-size distribution, bond compatibility and finished-tool performance.
