NB TW16OP Linear Ball Bushing
The TW16OP is a high‑performance open‑type linear ball bushing from NB Corporation’s TOPBALL TW series. It features a self‑aligning design, 5‑row recirculating steel balls, and an open‑slot structure for easy shaft installation. Delivering approximately 3× higher load capacity and 27× longer travel life than conventional slide bushings, it is ideal for precision automation, machine tools, and linear motion systems requiring high rigidity and smooth operation.
The TW16OP is a high‑performance open‑type linear ball bushing from NB Corporation’s TOPBALL TW series. It features a self‑aligning design, 5‑row recirculating steel balls, and an open‑slot structure for easy shaft installation. Delivering approximately 3× higher load capacity and 27× longer travel life than conventional slide bushings, it is ideal for precision automation, machine tools, and linear motion systems requiring high rigidity and smooth operation.
Official Specifications
| Parameter | Value (Inch) | Value (Metric) | Unit |
|---|---|---|---|
| Inner bore diameter (dr) | 1.0000 | 25.40 | mm |
| Outer diameter (D) | 1.5625 | 39.69 | mm |
| Overall length (L) | 2.2500 | 57.15 | mm |
| Distance between retaining rings (B) | 1.8860 | 47.90 | mm |
| Retaining ring width (W) | 0.0679 | 1.72 | mm |
| Retaining ring diameter (D1) | 1.4687 | 37.30 | mm |
| Ball diameter | 5/32 | 3.97 | mm |
| Number of ball circuits | 5 | 5 | — |
| Basic dynamic load rating (C) | 850 | 3,781 | N |
| Basic static load rating (C₀) | 1,060 | 4,715 | N |
| Mass | 0.22 | 100 | g |
| Bore tolerance (dr) | 0 / –0.0005 | 0 / –0.013 | mm |
| Length tolerance (L) | ±0.008 | ±0.20 | mm |
| Open slot width (h) | 0.5625 | 14.29 | mm |
| Open angle | 30° | 30° | ° |
| Retention hole diameter (F) | 0.136 | 3.45 | mm |
| Retention hole location (G) | 0.1250 | 3.18 | mm |
| Retention hole depth (J) | 0.0470 | 1.19 | mm |
| Retainer material | Polymer resin | Polymer resin | — |
| Outer sleeve material | High‑carbon bearing steel | High‑carbon bearing steel | — |
| Operating temperature range | –10°C to +80°C | –10°C to +80°C | °C |
| Seal type | None (standard; UU seals optional) | None | — |
Key Features
- Self‑aligning capability: Compensates for shaft misalignment and installation errors up to 0.5°, ensuring smooth motion.
- High load & long life: 5‑row ball design provides superior radial load capacity and extended service life vs. standard bushings.
- Open‑type structure: Large open slot simplifies shaft mounting and maintenance in confined spaces.
- Polymer resin retainer: Lightweight, low‑noise, and stable ball guidance for consistent performance.
- Floating wiper seal: Integral seal design prevents dust ingress while accommodating self‑alignment.
- Standardized dimensions: Interchangeable with other TW‑series open‑type linear bushings.
Official Notes
- Designed exclusively for linear motion; not for pure rotational or moment loads. Use multiple bushings on a single shaft to resist moment loads.
- For sealed applications, specify the TW16OPUU variant (with UU seals), max operating temperature 80°C.
- Recommended lubrication: Lithium‑based grease (e.g., NB standard grease) for optimal performance.
- Shaft requirements: Surface hardness ≥58 HRC, surface roughness Ra ≤0.4 μm.
