PTFE ball tolerances vary based on diameter size, with larger balls (typically above 1/8 inch) having looser tolerances compared to smaller ones. Standard diameter tolerance is ±5%, but precision tolerances can be specified per item. Larger balls (e.g., up to 8 inches) generally have a diameter tolerance of ±0.005 inch and a TIR (Total Indicator Reading) of 0.0005 inch max, while smaller balls may achieve ±0.003 inch diameter tolerance with a TIR of 0.003 inch max. Surface finishes and customization options like chemical etching are also available for specialized applications.
Key Points Explained:
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Size-Based Tolerance Ranges
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Larger PTFE balls (typically >1/8 inch):
- Diameter tolerance: ±0.005 inch
- TIR (roundness/consistency): ≤0.0005 inch
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Smaller PTFE balls:
- Diameter tolerance: ±0.003 inch
- TIR: ≤0.003 inch
- Standard tolerance for all sizes is ±5% of diameter unless precision tolerances are specified.
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Larger PTFE balls (typically >1/8 inch):
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Available Sizes
- PTFE balls range from 1/8 inch to 8 inches in diameter.
- Stock sizes vary; custom production is possible for large quantities.
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Precision Specifications
- Precision tolerances (tighter than ±5%) must be requested per item.
- TIR values indicate roundness accuracy—critical for high-performance applications like seals or bearings.
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Additional Customization
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Surface finishes:
- Tumbled: 50–63 microinches (standard)
- Machined: 32 microinches (smoother)
- Chemical etching: Enhances bonding for assemblies requiring adhesion.
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Surface finishes:
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Practical Considerations for Purchasers
- Verify tolerance requirements early—precision tolerances may increase lead time/cost.
- For critical applications (e.g., medical or aerospace), specify TIR and surface finish to ensure performance.
- Larger balls prioritize dimensional stability, while smaller ones benefit from tighter tolerances.
This structured approach ensures you select the right PTFE balls for your project’s mechanical and chemical demands.
Summary Table:
| PTFE Ball Size | Diameter Tolerance | TIR (Roundness) | Surface Finish Options |
|---|---|---|---|
| Small (<1/8 inch) | ±0.003 inch | ≤0.003 inch | Tumbled (50–63 µin), Machined (32 µin) |
| Large (≥1/8 inch) | ±0.005 inch | ≤0.0005 inch | Tumbled (50–63 µin), Machined (32 µin) |
| Custom/Precision | ±5% (standard) or tighter per request | Specified per item | Chemical etching available |
Ensure your project meets exacting standards with precision PTFE balls tailored to your needs. KINTEK specializes in high-performance PTFE components, including seals, liners, and labware, for industries like semiconductor, medical, and industrial manufacturing. Whether you need prototypes or high-volume orders, our custom fabrication ensures optimal tolerances and surface finishes. Contact us today to discuss your requirements!