Product specifications 表格（Model: SMR74-1.6, Part Number: DS-4B, ID×OD×width: 4×7×1.6 mm, Shields: Open）+ How to select this bearing 段落（DS low-speed 4mm bore group + 440C Stainless Steel balls + open configuration + 兄弟件号 DS-4A, DS-4D, DS-4E）
Specification Source and Limits
Product reference: DS-4A. Source: manufacturer product catalog supplied to DENTORQUE, page 9, panel R3C1.
The source file is titled 轴承2026产品资料.pdf. A controlled revision and publication date are not stated in the supplied catalog; the year in its filename is not an issue-date verification.
Catalog markings are source information, not an independent test report or confirmation of compatibility with a specific handpiece. Exact geometry, assembly version and operating requirements still need to be confirmed for your application.
For questions about this source, contact DENTORQUE and quote DS-4A, page 9, panel R3C1. Read our fitment evidence standard before treating a candidate as a confirmed replacement.
