GB9 Grade Precision
Two accuracy grades above the common GB11 baseline. Typical targets include cumulative pitch error <= 5 um and profile error <= 12 um.
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Powder Metallurgy Gears
High-precision sintered gears manufactured to GB9 grade. From power tool planetary sets to automotive transmission components, we deliver complex gear geometry with repeatable accuracy and long service life.
Why Powder Metallurgy for Gears?
Powder metallurgy forms complex tooth profiles directly during compaction, which reduces machining steps, limits scrap, and supports stable high-volume output.
- Net-shape tooth profiles formed in one pressing operation
- Material utilization above 95% versus 60-70% for machined gears
- Consistent batch quality with low variation
- Strong cost advantage once annual demand exceeds 10,000 pieces
PM Gear Manufacturing
KISSsoft Design
German KISSsoft gear design software supports shrinkage compensation, profile optimization, and meshing verification.
Low Noise Operation
Optimized tooth profiles reduce meshing shock and help critical applications run below 75 dB, with select programs below 70 dB.
Extended Service Life
GB9 gears are designed for 500-1000+ hour service life under rated load with stronger wear consistency than lower precision alternatives.
Gear Types We Manufacture
Spur Gears
Straight-cut teeth for parallel shafts and standard motion transfer.
Helical Gears
Angled teeth for smoother running and higher load capacity.
Planetary Gears
Compact high-torque gearsets for power tools and reducers.
Bevel Gears
Conical tooth geometry for power transfer between intersecting shafts.
Gear Racks
Linear motion conversion for rack-and-pinion systems.
Synchronizer Hubs
Automotive transmission parts requiring tight dimensional consistency.
Typical Applications
Power Tools
Drills, impact drivers, angle grinders, and garden tools. Typical torque range: 35-1000 N.m.
Learn moreAutomotive
Transmission gears, differential components, and engine timing gears.
Learn moreIndustrial
Gearboxes, automation equipment, and conveyor systems.
Learn moreAppliances
Reducers, gearbox sets, and small motor drive components.
Learn moreGB9 Precision Standards
GB9 is two accuracy grades above the common GB11 baseline. We achieve it through compensated tooling, process control, and dedicated inspection.
| Parameter | GB9 (Our Standard) | GB11 (Typical Baseline) | Improvement |
|---|---|---|---|
| Single Pitch Error | <= 8 um | <= 16 um | 2x better |
| Cumulative Pitch Error | <= 5 um | <= 10 um | 2x better |
| Profile Error | <= 12 um | <= 24 um | 2x better |
| Helix Error | <= 8 um | <= 16 um | 2x better |
| Runout Tolerance | <= 5 um | <= 10 um | 2x better |
Reference: GB/T 10095.1-2001 for gears with module 1-3.5 mm.
KISSsoft Design & Simulation
KISSsoft helps our team validate shrinkage compensation, tooth form, contact behavior, and fatigue performance before tooling release.
Shrinkage Compensation
Automatic calculation of sintering shrinkage for tooling design
Tooth Profile Optimization
Profile shift and relief design to reduce noise and wear
Meshing Analysis
Contact pattern review to predict load distribution
Strength Verification
Contact and bending fatigue checks aligned with ISO 6336
Tolerance Analysis
Simulation of tolerance stack-up before production launch
Design Capabilities
Minimum Module0.3 mm
Maximum Diameter150 mm
Helical AngleUp to 30 deg
Pressure Angle20 deg standard
Tooth Count Range8-150 teeth
Common Gear Materials
| Grade | Composition | Hardness | Typical Use |
|---|---|---|---|
| FC-0208 | Fe-2Cu-0.8C | 80-100 HRB | High-strength power tool gears |
| FC-0508 | Fe-5Cu-0.8C | 85-105 HRB | Heavy-load gears |
| FN-0205 | Fe-2Ni-0.5C | 70-90 HRB | Automotive gears that need added toughness |
See our full materials reference on the PM materials page.
Frequently Asked Questions
What are powdered metal gears?
Powdered metal gears are sintered gears made by compacting metal powder in a die and bonding the particles in a furnace. Powder metallurgy gears can form net-shape tooth profiles in one pressing operation, which often reduces machining cost and scrap versus cut gears at medium-to-high volume.
How does gear manufacturing by powder metallurgy work?
Gear manufacturing by powder metallurgy follows powder blending, compaction in a tooth die, sintering to bond particles, then sizing or coining to calibrate pitch and bore dimensions. Many programs also use heat treatment or steam treatment before final inspection.
What precision can powder metallurgy gears achieve?
With compensated tooling and sizing, powder metallurgy gears can reach GB9-class pitch and profile accuracy for many power tool and transmission applications. Higher local precision on bores or faces may require additional sizing or selective machining.
When is PM cheaper than machined gears?
PM is often competitive once annual demand exceeds roughly 10,000 pieces and the tooth geometry suits compaction. Tooling cost is offset by high material utilization and fast cycle times. For prototypes or very low volume, machined gears may remain more economical.
Related Resources
Use these internal links to keep moving through the most relevant guides, service pages, and technical references for this topic.
PM Gear Design Guide
Shrinkage compensation, draft angle, and KISSsoft validation for stable PM gear production.
GB9 Gear Precision Guide
Go deeper into what GB9 means, how it compares with GB11, and why it matters for noise and life.
Sintering Process in Powder Metallurgy
Understand how sintering densifies gear compacts and affects shrinkage and tooth accuracy.
Steam Treatment for PM Parts
Improve surface hardness and wear resistance on high-duty gear and hub applications.
Powder Metallurgy Manufacturer
Full manufacturer capabilities, industries served, and qualification support for gear programs.
Sizing & Coining Guide
Review tolerance correction, post-sinter calibration, and the checkpoints that matter before releasing gear tooling.