Standard accuracy of our products
Ball products from Sato Tekkou are manufactured through standardized manufacturing and quality control processes so that the customer can use them with ease, and only the top quality balls are delivered to our customers.
It manufactured based on many years of research on materials and experience in ball polishing, dimensional measurement is inspected and managed by our original sphere measuring instrument.
The basic rule of our quality assurance is to let our customers use our products with confidence. We want our world customers to know that the products from Sato Tekkou are always reliable and made of the highest quality.
Standard accurancy of Plastic balls
Unit：μｍ
| Ball diameter （inch） |
Ball diameter variation | Lot diameter variation （MAX） |
Sphericity （MAX） |
|||
|---|---|---|---|---|---|---|
| Precision grade | High grade | Precision grade | High grade | Precision grade | High grade | |
| 3/32・1/8・5/32・ 3/16・7/32・1/4 | ±20 | ±50 | 7 | 10 | 5 | 5 (7) |
| 9/32・5/16・3/8・1/2・7/16・5/8 | 10 | 15 | 5 | 7 (12) | ||
| 3/4 ・ 7/8 ・ 1 | 15 | 20 | 7 | 10 (15) | ||
※ The sphericity of Polypropylene ball, Polyethylene ball and UHMWPE ball are the number in ( ).
Standard accurancy of PTFE
Unit：（μｍ）
| Ball diameter （inch） |
Ball diameter variation |
Sphericity （MAX） |
||||
|---|---|---|---|---|---|---|
| Grade 1 | Grade 1 | |||||
| φ2.0・3/32・1/8・5/32・3/16・7/32・1/4 | ±100 | 7 | ||||
| 9/32・5/16・3/8・1/2・7/16・5/8 | 12 | |||||
| 3/4 ・ 7/8 ・ 1 | ±200 | 15 | ||||
※ The standard is based on the JIS K6884-1971.
※ The standard of PTFE M-139 is also based on the JIS K6884-1971.