Our Backing Bearings are built for Sendzimir 20‑Hi / 12‑Hi multi‑roll Z‑mill cold rolling machines. Double‑row or triple‑row full‑complement cylindrical rollers feature extra‑thick outer ring as working surface, stationary inner ring on mandrel, offering high rigidity, heavy radial load and long service life under metallurgical rolling‑mill conditions.
Backing bearings adopt manufacturer‑proprietary part numbers including NSK 2U/3PL, SKF BCZ, FAG Z‑series. No unified ISO model designation system, dimensions and precision comply with ISO 492. Our BN‑series and NNCF‑series provide dimension‑matched replacement solutions. Standard precision grade P4, with strict T‑value grouping for complete‑set assembly.
- Extra thick outer ring for high rigidity and heavy radial load
- Outer ring rotation with stationary inner ring design
- Double‑row / triple‑row cylindrical roller structure
- High precision tolerance grade: P4
- Strict T‑value matching for complete‑set assembly
Cost‑effective import substitute for steel‑plant maintenance and upgrade. If your OEM part number is not listed below, send us part number, dimensions or drawing for quotation.
Product Specifications
| Inquiry | Bearing No. | d | D | B | Cr | Cor | Weight |
|---|---|---|---|---|---|---|---|
| BNTB4092171 | 200 | 460 | 171 | 1880 | 3340 | 166 |
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FAQ
What are backing bearings used for?
Primarily engineered for rolling mill equipment, main applications:
- 20‑high Sendzimir Z‑Mill cold rolling mill
- 12‑high multi‑roll cold rolling mill
- Steel strip leveling and straightening machines (secondary application)
- Metallurgical rolling‑mill maintenance & spare‑part replacement