Why Do PA66 Bushings Show Clearance Growth and Vibration After Running?
PA66 is widely used for bushings, guide blocks, and moving support parts. It offers good strength, toughness, and heat resistance. However, in repeated sliding or rotating support positions, ordinary PA66 may show:
1. The Problem
PA66 is widely used for bushings, guide blocks, and moving support parts. It offers good strength, toughness, and heat resistance. However, in repeated sliding or rotating support positions, ordinary PA66 may show:
DGK-PA66 FL20L. is the relevant aramid reinforced PA66 product page for bushing wear and clearance validation.
clearance growth; vibration; wear powder; surface scoring; assembly looseness; short replacement interval.
For bushings, the key failure is often not immediate breakage. It is gradual wear that changes clearance and affects the stability of the whole mechanism.
2. Why It Happens
Common reasons include:
ordinary PA66 is not wear-resistant enough for the load; humidity changes PA66 dimensions and mechanical behavior; the mating shaft or support surface is too rough; the formulation lacks internal wear balance; the bushing is too thin or has local stress concentration; the material is too hard and damages the mating surface; conditioning before testing is not consistent.
For PA66 bushings, moisture conditioning is important. A dry-as-molded part and a conditioned part may behave differently.
3. DEYU Material Direction
When ordinary PA66 wears too fast, but a hard filled nylon causes assembly or mating-surface problems, DEYU may recommend DGK-PA66 FL20L aramid reinforced PA66.
Development direction:
reduce wear depth; control clearance growth; retain toughness; reduce vibration; avoid severe mating-surface scratching; stabilize dimensions after conditioning; maintain injection molding processability.
4. Product Detail Fields Used for This Route
The article uses the current DEYU product-detail fields instead of estimated mechanical ranges.
| Product field | DGK-PA66 FL20L |
|---|---|
| Base Resin | PA66 |
| Model | FL20L |
| Key Performance | Aramid reinforced; high strength, low shrinkage and excellent wear resistance. |
| Application Cases | High-speed friction parts, textile components and wear-resistant structural parts. |
| Processing | Injection molding |
| Color Service | Supported |
5. Customer Debugging Data
| Item | Ordinary PA66 Bushing | Hard Filled Nylon Trial | DEYU DGK-PA66 FL20L Aramid PA66 |
|---|---|---|---|
| Trial quantity | 3,000 pcs | 2,500 pcs | 5,000 pcs |
| Average wear depth | 0.121 mm | 0.091 mm | 0.045 mm |
| Clearance out-of-limit rate | 7.1% | 4.6% | 1.4% |
| Vibration complaint rate | 4.0% | 2.8% | 0.9% |
| Assembly scrap rate | 3.3% | 2.6% | 1.0% |
| Mating surface scratch | Low | Medium-high | Low-medium |
| Replacement cycle direction | 3 months | 4–5 months | 7–8 months |
6. Result Interpretation
The aramid PA66 route reduced wear depth by about 63% compared with ordinary PA66 in this validation scenario. It also improved clearance stability and reduced vibration complaints.
The key was not making the nylon simply harder. The improvement came from balancing aramid fiber, toughness, surface condition, and dimensional stability after conditioning.
Conclusion
PA66 bushing wear should be evaluated by clearance change, vibration, wear depth, and replacement interval. When ordinary nylon wears too quickly and hard filled nylon damages the mating part, aramid reinforced PA66 may be a more balanced route.
