支援長行程的3軌道雙滑動型，厚度最薄，即使是作用負荷很大的部位，使用時也可節省空間。
尺寸表
| 號 | 軌道長度 L (±0.8) | 行程長度 S (±3) | 容許負荷 N/組 | 詳細規格 | CAD | 尺寸表 | |
| 2D (DXF) | 3D | ||||||
| mm | mm | ||||||
| FBL51H+305L | 305 | 330 | 850 |  |
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| FBL51H+356L | 356 | 381 | 820 | |
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| FBL51H+406L | 406 | 432 | 770 | |
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| FBL51H+457L | 457 | 483 | 730 | |
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| FBL51H+508L | 508 | 533 | 710 | |
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| FBL51H+559L | 559 | 584 | 690 | |
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| FBL51H+610L | 610 | 635 | 660 | |
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| FBL51H+660L | 660 | 686 | 630 | |
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| FBL51H+711L | 711 | 737 | 610 | |
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| FBL51H+762L | 762 | 787 | 580 | |
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