M4 20°black Tin coating AAA 90×90×32 Gear Hob — super high Precision Tool for High-Efficiency Gear Cutting

 

The Module 4 pressure angle 20° AAA 90×90×32 gear hob is a super high-precision cutting tool engineered for professional gear manufacturing. Designed for spur and helical gears, it delivers outstanding surface finish and dimensional accuracy even in high-speed, continuous production environments.

Manufactured from premium HSS-M35 material and coated with advanced wear-resistant surface treatment, this hob ensures long tool life, excellent chip evacuation, and stable performance under heavy-duty cutting conditions.

 

 Applications:

Perfect for Gear machining for aircraft engines and helicopter transmission systems in aerospace; spindle boxes and feed systems for high-precision machine tools. Wind turbine gearboxes for energy equipment; gearboxes for high-end racing cars and luxury vehicles. Reducers and transmission systems for precision instruments and robots.

 

 

Technical Specifications:

Parameter	Specification	Description / Notes
Product Name	Black Tin coating Module 4 pressure angle 20° AAA 90×90×32  Gear Hob Cutting Tool	Standard single or multi-start gear hob
Module (m)	4	Defines gear tooth size; for large module gears
Material	HSS M35 HSS-E (W6Mo5Cr4V2Co5)/SKH55/DIN1.3243/HS2-9-1-8	High-Speed Steel for excellent hardness & wear resistance
Pressure Angle (PA)	20°	Standard involute gear pressure angle for smooth gear meshing
Accuracy Grade	Class AAA /ISO11054/DIN3968/ANSI/AGMA/JISB4356	Ensures precise tooth form and dimensional accuracy
Finish / Coating	Black Oxide	Protects against corrosion, reduces friction & glare
Outer Diameter (OD)	90	Depends on module and cutting design
Overall Length (L)	90	Size suitable for module 12 hobs
Bore Diameter	32	Fits standard hob arbors
Number of Starts	Single / Multi-start (as specified)	Multi-starts allow faster cutting; single for precision
Type of Gear Cut	Spur / Helical Gear	Customizable per order
Direction of Cut	Right-hand (standard) / Left-hand (optional)	Based on machine spindle orientation
Profile Standard	DIN 3972 / ISO 53	Standard involute profile with 20° pressure angle
Application	Gear Hobbing Machines	For cutting steel, cast iron, or alloy gears
Hardness (after heat treatment)	64–66 HRC	Ensures long tool life and cutting edge stability
Surface Treatment	Steam Oxidized / Blackened	Improves chip evacuation and oxidation resistance
Coating Options (optional)	TiN, TiAlN, AlCrN	For extended tool life and high-speed applications
Country of Manufacture	China	Common production origins
Typical Industries	Automotive, Industrial Machinery, Gearbox Manufacturing, Aerospace	Used where precision gears are required

 

 

Key Features:

• Made from HSS M35 for toughness and wear resistance.
• 20° pressure angle — the most common standard for gear systems.
• Black oxide coating for corrosion protection and improved tool life.
• Class AAA accuracy ensures super precise, smooth, and quiet gear operation.
• Available in right-hand or left-hand cutting directions.
• Compatible with manual, semi-automatic, and CNC gear hobbing machines.
• Suitable for roughing, finishing, and pre-grinding hobbing applications.

Applications:

• Automotive transmission gear manufacturing
• Precision industrial gearboxes
• Power tools, machinery components
• Agricultural and construction equipment
• Aerospace and defense gear systems

Ordering Information:

Please specify when ordering:

1. Module/DP/CP (e.g., M12)
2. Pressure Angle (e.g., 20°, 30°)
3. Coating (TIN/TIAIN/ALCRONA/ALTENSA)
4. Accuracy Grade (A, AA, AA+, or AAA)

Accuracy Grade Standards: GB6084/DIN3968/ANSI B94.7/JIS B 4354

5. Gear Type (Spur/Helical)
6. Cutting Direction (Right-Handed or Left-Handed)
7. Bore and OD Diameter, Total Length
8. Number of Teeth
9. Hob Material: M2/M35/M42/ASP2052/S390/MC90/P6M5/Р6М5К5/Р10К5Ф5
10. Carbide