![[THK] — MST Miniature Stroke Ball Cage Unit (MST3-A~MST6-C)](https://prosourcemro.com/wp-content/uploads/2026/05/001-1013-1024x719.png)
Ball Cages
THK
[THK] — MST Miniature Stroke Ball Cage Unit (MST3-A~MST6-C)
Family ID: THK-MST
MST type Miniature Stroke Unit — high-precision ball cage with outer shell and ST shaft. Point contact between balls and raceway minimizes rolling resistance for smooth linear motion. Three length variants: A (Lm=10mm), B (Lm=15mm), C (Lm=20mm). Shaft diameters: 3~6mm. Radial clearance -2~+5μm standard; C1 preload option available.
12 product codes available in this family
Product Codes & Specifications
| Product Code | Description | Brand | Spec | ||
|---|---|---|---|---|---|
| MST3-A | THK miniature stroke unit, shaft φ5mm, ST shaft φ3mm, Lm=10mm | THK | Shaft Dia.: dS=5mm | ST Shaft Dia.: dt=3mm | Cage Ball Dia.: Da=1mm | Cage Length: Lm=10mm | Length Variant: A | Radial Clearance: -2~+5μm (C1 preload option available) | Feature: Point contact; low rolling resistance | Order: Specify cage + outer shell + ST shaft separately | ||
| MST3-B | THK miniature stroke unit, shaft φ5mm, ST shaft φ3mm, Lm=15mm | THK | Shaft Dia.: dS=5mm | ST Shaft Dia.: dt=3mm | Cage Ball Dia.: Da=1mm | Cage Length: Lm=15mm | Length Variant: B | Radial Clearance: -2~+5μm (C1 preload option available) | Feature: Point contact; low rolling resistance | Order: Specify cage + outer shell + ST shaft separately | ||
| MST3-C | THK miniature stroke unit, shaft φ5mm, ST shaft φ3mm, Lm=20mm | THK | Shaft Dia.: dS=5mm | ST Shaft Dia.: dt=3mm | Cage Ball Dia.: Da=1mm | Cage Length: Lm=20mm | Length Variant: C | Radial Clearance: -2~+5μm (C1 preload option available) | Feature: Point contact; low rolling resistance | Order: Specify cage + outer shell + ST shaft separately | ||
| MST4-A | THK miniature stroke unit, shaft φ6mm, ST shaft φ4mm, Lm=10mm | THK | Shaft Dia.: dS=6mm | ST Shaft Dia.: dt=4mm | Cage Ball Dia.: Da=1mm | Cage Length: Lm=10mm | Length Variant: A | Radial Clearance: -2~+5μm (C1 preload option available) | Feature: Point contact; low rolling resistance | Order: Specify cage + outer shell + ST shaft separately | ||
| MST4-B | THK miniature stroke unit, shaft φ6mm, ST shaft φ4mm, Lm=15mm | THK | Shaft Dia.: dS=6mm | ST Shaft Dia.: dt=4mm | Cage Ball Dia.: Da=1mm | Cage Length: Lm=15mm | Length Variant: B | Radial Clearance: -2~+5μm (C1 preload option available) | Feature: Point contact; low rolling resistance | Order: Specify cage + outer shell + ST shaft separately | ||
| MST4-C | THK miniature stroke unit, shaft φ6mm, ST shaft φ4mm, Lm=20mm | THK | Shaft Dia.: dS=6mm | ST Shaft Dia.: dt=4mm | Cage Ball Dia.: Da=1mm | Cage Length: Lm=20mm | Length Variant: C | Radial Clearance: -2~+5μm (C1 preload option available) | Feature: Point contact; low rolling resistance | Order: Specify cage + outer shell + ST shaft separately | ||
| MST5-A | THK miniature stroke unit, shaft φ7mm, ST shaft φ5mm, Lm=10mm | THK | Shaft Dia.: dS=7mm | ST Shaft Dia.: dt=5mm | Cage Ball Dia.: Da=1mm | Cage Length: Lm=10mm | Length Variant: A | Radial Clearance: -2~+5μm (C1 preload option available) | Feature: Point contact; low rolling resistance | Order: Specify cage + outer shell + ST shaft separately | ||
| MST5-B | THK miniature stroke unit, shaft φ7mm, ST shaft φ5mm, Lm=15mm | THK | Shaft Dia.: dS=7mm | ST Shaft Dia.: dt=5mm | Cage Ball Dia.: Da=1mm | Cage Length: Lm=15mm | Length Variant: B | Radial Clearance: -2~+5μm (C1 preload option available) | Feature: Point contact; low rolling resistance | Order: Specify cage + outer shell + ST shaft separately | ||
| MST5-C | THK miniature stroke unit, shaft φ7mm, ST shaft φ5mm, Lm=20mm | THK | Shaft Dia.: dS=7mm | ST Shaft Dia.: dt=5mm | Cage Ball Dia.: Da=1mm | Cage Length: Lm=20mm | Length Variant: C | Radial Clearance: -2~+5μm (C1 preload option available) | Feature: Point contact; low rolling resistance | Order: Specify cage + outer shell + ST shaft separately | ||
| MST6-A | THK miniature stroke unit, shaft φ8mm, ST shaft φ6mm, Lm=10mm | THK | Shaft Dia.: dS=8mm | ST Shaft Dia.: dt=6mm | Cage Ball Dia.: Da=1mm | Cage Length: Lm=10mm | Length Variant: A | Radial Clearance: -2~+5μm (C1 preload option available) | Feature: Point contact; low rolling resistance | Order: Specify cage + outer shell + ST shaft separately | ||
| MST6-B | THK miniature stroke unit, shaft φ8mm, ST shaft φ6mm, Lm=15mm | THK | Shaft Dia.: dS=8mm | ST Shaft Dia.: dt=6mm | Cage Ball Dia.: Da=1mm | Cage Length: Lm=15mm | Length Variant: B | Radial Clearance: -2~+5μm (C1 preload option available) | Feature: Point contact; low rolling resistance | Order: Specify cage + outer shell + ST shaft separately | ||
| MST6-C | THK miniature stroke unit, shaft φ8mm, ST shaft φ6mm, Lm=20mm | THK | Shaft Dia.: dS=8mm | ST Shaft Dia.: dt=6mm | Cage Ball Dia.: Da=1mm | Cage Length: Lm=20mm | Length Variant: C | Radial Clearance: -2~+5μm (C1 preload option available) | Feature: Point contact; low rolling resistance | Order: Specify cage + outer shell + ST shaft separately |
