How Accurate Is Powder Metallurgy?
Jun 15, 2026| Powder metallurgy achieves high precision, ranking among the top tiers in common metal forming processes, typically reaching IT6 to IT8 levels. There are numerous applications where sintered parts can be used directly without further machining.
Specific accuracy data
| Precision dimension | Typical numerical range | Explanation |
| Dimensional accuracy | ± 0.01-0.05mm (radial) | Small parts can reach ± 0.005mm |
| Surface roughness | Ra 0.8～3.2μm | Sintered state; Subsequent refinement can reach Ra 0.2 μ m |
| Coaxiality/roundness | 0.01～0.03mm | Mold accuracy determines upper limit |
| Weight accuracy | ±0.5%～1% | Suitable for scenarios with high batch consistency requirements |
Key factors affecting accuracy
• Mold accuracy: The upper limit of the size of powder metallurgy is determined by the mold, and the accuracy will decrease after the mold wears out. The service life of a pair of molds is usually tens of thousands to hundreds of thousands of pieces.
• Powder particle size and uniformity: The finer the powder, the more uniform the particle size distribution, the more controllable the sintering shrinkage, and the higher the accuracy.
• Sintering process: Improper control of temperature, time, and atmosphere can lead to uneven shrinkage, directly affecting dimensional stability.
• Subsequent processing: Fine tuning/shaping can further improve accuracy to IT5-IT6; Oil immersion and heat treatment have a relatively small impact on size, but a margin of variation needs to be reserved.
Comparison of accuracy with other processes
| Process | Typical accuracy level | Characteristic |
| Powder metallurgy | IT6～IT8 | One time molding, good batch consistency |
| Precision casting | IT7～IT9 | The advantage of complex shapes is significant, but the accuracy is slightly lower |
| Cold forging | IT7～IT9 | High intensity, moderate accuracy |
| CNC machining | IT5～IT7 | The highest accuracy, but low material utilization rate |
The real advantage of powder metallurgy is not to match the ultimate precision of CNC, but to "save a lot of machining in one molding" and reduce the overall cost in mass production.With a deep understanding of the characteristics of various sintered metal materials, we can accurately match material formulas and sintering processes according to your working conditions, and customize powder metallurgy sintered metal parts that have both performance and cost advantages. From preliminary design to mass production in the later stage, we provide one-stop customization services for you. Welcome to inquire with samples and drawings .