The MBF0801.5-3.7 is a miniature, no preload ball screw manufactured by THK, belonging to the THK MBF series. It features a single-nut, preload-free structure, exhibiting minimal axial backlash, smooth operation with low friction, and lower cost.
Specifications
Screw outer diameter: 8 mm
Lead: 1.5 mm
Ball center diameter: 8.2 mm
Dynamic load rating: 1.1 kN
Static load rating: 2.2 kN
Nut outer diameter: 16 mm
Flange outer diameter: 30 mm
Nut total length L: 19 mm
Nut weight: 0.03 kg
Screw weight: 0.36 kg/m
Key Features of the MBF0801.5-3.7 No Preload Ball Screw
Miniature and Compact Design: The MBF0801.5-3.7 belongs to THK’s miniature precision ball screw series. Its small nut outer diameter and lightweight structure make it extremely suitable for installations in confined spaces.
No Preload and Minimal Backlash: Compared to preloaded ball screws, it has very low starting torque, low resistance, and low heat generation, ensuring smoother operation of miniature motors.
High-Precision Positioning: Although preload-free, as a precision ball screw, it achieves extremely high repeatability.
THK MBF0801.5-3.7 No Preload Precision Ball Screw Application Scenarios
Miniature Automation Equipment
Semiconductor Manufacturing Equipment
Medical Equipment
Optical and Optoelectronic Equipment
Precision Testing Instruments
Electronic Manufacturing Equipment
| THK MBF Ball Screw Model | |
| MBF0401-3.7 | MBF0601-3.7 |
| MBF0602-2.7 | MBF0602.5-2.7 |
| MBF0801.5-3.7 | MBF0802-3.7 |
| MBF0802.5-3.7 | MBF0803-2.7 |
| MBF0804-2.7 | MBF1001-3.7 |
| MBF1001.5-3.7 | MBF1002-3.7 |
| MBF1002.5-3.7 | MBF1003-3.7 |
| MBF1005-2.7 | MBF1202-3.7 |
| MBF1202.5-3.7 | MBF1203-3.7 |
| MBF1204-3.7 | MBF1402-3.7 |
| MBF1404-3.7 | |
Model No. |
Screw shaft outer diameterd |
Lead
Ph |
Ball center- to-center diameterdp |
Thread minor diameterdc |
No.of loaded circuitsRows X turns |
Basic load rating | Rigidity
K N/μm |
|
| Ca
kN |
Coa
kN |
|||||||
| MBF 0401-3.7 | 4 | 1 | 4.15 | 3.3 | 1×3.7 | 0.59 | 0.93 | 54 |
| MBF 0601-3.7 | 6 | 1 | 6.15 | 5.3 | 1×3.7 | 0.74 | 1.5 | 75 |
| MBF 0602-2.7 | 6 | 2 | 6.2 | 5.1 | 1×2.7 | 0.75 | 1.2 | 58 |
| MBF 0602.5-2.7 | 6 | 2.5 | 6.2 | 5.1 | 1×2.7 | 0.75 | 1.2 | 59 |
| MBF 0801.5-3.7 | 8 | 1.5 | 8.2 | 7.1 | 1×3.7 | 1.1 | 2.2 | 99 |
| MBF 0802-3.7 | 8 | 2 | 8.3 | 6.6 | 1×3.7 | 2.5 | 4.2 | 111 |
| MBF 0802.5-3.7 | 8 | 2.5 | 8.3 | 6.6 | 1×3.7 | 2.4 | 4.1 | 111 |
| MBF 0803-2.7 | 8 | 3 | 8.3 | 6.2 | 1×2.7 | 2.6 | 4.2 | 85 |
| MBF 0804-2.7 | 8 | 4 | 8.3 | 6.2 | 1×2.7 | 2.6 | 4.2 | 84 |
| MBF 1001-3.7 | 10 | 1 | 10.15 | 9.3 | 1×3.7 | 0.84 | 2 | 113 |
| MBF 1001.5-3.7 | 10 | 1.5 | 10.2 | 9.1 | 1×3.7 | 1.25 | 2.8 | 120 |
| MBF 1002-3.7 | 10 | 2 | 10.3 | 8.6 | 1×3.7 | 2.8 | 5.3 | 134 |
| MBF 1002.5-3.7 | 10 | 2.5 | 10.3 | 8.6 | 1×3.7 | 2.7 | 5.3 | 133 |
| MBF 1003-3.7 | 10 | 3 | 10.3 | 8.2 | 1×3.7 | 3.9 | 7.2 | 140 |
| MBF 1005-2.7 | 10 | 5 | 10.3 | 8.2 | 1×2.7 | 3 | 5.2 | 103 |
| MBF 1202-3.7 | 12 | 12.3 | 10.6 | 1×3.7 | 3 | 6.5 | 156 | |
| MBF 1202.5-3.7 | 12 | 2.5 | 12.3 | 10.6 | 1×3.7 | 3 | 6.4 | 156 |
| MBF 1203-3.7 | 12 | 3 | 12.3 | 10.2 | 1×3.7 | 4.3 | 8.7 | 162 |
| MBF 1204-3.7 | 12 | 4 | 12.3 | 9.8 | 1×3.7 | 5.4 | 10.2 | 165 |
| MBF 1402-3.7 | 14 | 2 | 14.3 | 12.6 | 1×3.7 | 3.3 | 7.5 | 176 |
| MBF 1404-3.7 | 14 | 4 | 14.3 | 11.8 | 1×3.7 | 5.7 | 11.1 | 187 |
Nut dimensions |
Screw shaft inertial moment/mm kg·m²/mm |
Nut
mass kg |
Shaft masskg/m |
||||||||||
| Outer diameterD |
Flange diameter D₁ |
Overall length L₁ |
H | B₁ | PCD | d₁ | d₂ | h | Nut type |
Tw | |||
| 11 | 24 | 18 | 4 | 14 | 17 | 3.4 | 6.5 | 2.5 | I | 13 | 1.97×10-10 | 0.02 | 0.07 |
| 13 | 30 | 21 | 5 | 16 | 21.5 | 3.4 | 6.5 | 3 | I | 17 | 9.99×10-10 | 0.04 | 0.14 |
| 15 | 29 | 17 | 4 | 13 | 23 | 3.4 | Ⅱ | 17 | 9.99×10-10 | 0.03 | 0.21 | ||
| 15 | 29 | 18 | 4 | 14 | 23 | 3.4 | Ⅱ | 17 | 9.99×10-10 | 0.03 | 0.21 | ||
| 16 | 30 | 19 | 4 | 15 | 24 | 3.4 | Ⅱ | 18 | 3.16×10-⁹ | 0.03 | 0.36 | ||
| 20 | 40 | 28 | 6 | 22 | 30 | 4.5 | 8 | 4 | I | 24 | 3.16×10-⁹ | 0.1 | 0.19 |
| 20 | 38 | 26 | 5 | 21 | 30 | 4.5 | Ⅱ | 22 | 3.16×10-⁹ | 0.07 | 0.34 | ||
| 20 | 38 | 25 | 5 | 20 | 30 | 4.5 | Ⅱ | 22 | 3.16×10-⁹ | 0.06 | 0.32 | ||
| 21 | 39 | 28 | 5 | 23 | 31 | 4.5 | Ⅱ | 23 | 3.16×10-⁹ | 0.08 | 0.34 | ||
| 19 | 37 | 18 | 5 | 13 | 29 | 4.5 | Ⅱ | 21 | 7.71×10-9 | 0.04 | 0.57 | ||
| 19 | 37 | 20 | 5 | 15 | 29 | 4.5 | 一 | 一 | Ⅱ | 21 | 7.71×10-9 | 0.04 | 0.57 |
| 23 | 43 | 28 | 6 | 22 | 33 | 4.5 | 8 | 4 | I | 27 | 7.71×10-9 | 0.11 | 0.36 |
| 24 | 44 | 27 | 6 | 21 | 35 | 5.5 | Ⅱ | 26 | 7.71×10-9 | 0.09 | 0.55 | ||
| 24 | 44 | 30 | 6 | 24 | 35 | 5.5 | Ⅱ | 26 | 7.71×10-9 | 0.1 | 0.52 | ||
| 24 | 44 | 34 | 6 | 28 | 35 | 5.5 | Ⅱ | 26 | 7.71×10-9 | 0.12 | 0.56 | ||
| 25 | 47 | 30 | 8 | 22 | 36 | 5.5 | 9.5 | 5.5 | I | 29 | 1.60×10-8 | 0.15 | 0.58 |
| 26 | 46 | 27 | 6 | 21 | 37 | 5.5 | Ⅱ | 28 | 1.60×10-8 | 0.11 | 0.8 | ||
| 28 | 48 | 30 | 6 | 24 | 39 | 5.5 | Ⅱ | 30 | 1.60×10-8 | 0.14 | 0.77 | ||
| 28 | 48 | 33 | 6 | 27 | 39 | 5.5 | Ⅱ | 30 | 1.60×10-8 | 0.15 | 0.76 | ||
| 26 | 48 | 30 | 8 | 22 | 37 | 5.5 | 9.5 | 5.5 | I | 32 | 2.96×10-8 | 0.16 | 0.85 |
| 30 | 54 | 38 | 8 | 30 | 42 | 5.5 | 9.5 | 5.5 | I | 34 | 2.96×10-8 | 0.25 | 1.2 |
