• THK MST Miniature Stroke Ball Cage Unit (MST3-A~MST6-C)
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THK MST Miniature Stroke Ball Cage Unit (MST3-A~MST6-C)

THK MST Miniature Stroke Ball Cage Unit (MST3-A~MST6-C)

MST type Miniature Stroke Unit — high-precision ball cage with outer shell and ST shaft.

Key features

  • 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

Specifications

Cage Ball Dia. Da=1mm
Radial Clearance -2~+5μm (C1 preload option available)
Feature Point contact; low rolling resistance
Order Specify cage + outer shell + ST shaft separately
MST3-A THK miniature stroke unit, shaft φ5mm, ST shaft φ3mm, Lm=10mm | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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
Ball CagesTHK
12 product codes available in this family
Sourced direct from KoreaExport-ready supplyCompetitive pricing
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THK MST Miniature Stroke Ball Cage Unit (MST3-A~MST6-C)

Brand THK·Ball Cages

Available part numbers (12)

MST3-A, MST3-B, MST3-C, MST4-A, MST4-B, MST4-C, MST5-A, MST5-B, MST5-C, MST6-A + 2 more — see full table ↓

How to order

Send the THK part numbers and quantities through our RFQ form or to info@prosourcemro.com. We confirm price, availability and lead time within 1 business day — no account needed.

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Product codes & specifications
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Product codeSpec
MST3-ATHK miniature stroke unit, shaft φ5mm, ST shaft φ3mm, Lm=10mm | 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-BTHK miniature stroke unit, shaft φ5mm, ST shaft φ3mm, Lm=15mm | 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-CTHK miniature stroke unit, shaft φ5mm, ST shaft φ3mm, Lm=20mm | 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-ATHK miniature stroke unit, shaft φ6mm, ST shaft φ4mm, Lm=10mm | 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-BTHK miniature stroke unit, shaft φ6mm, ST shaft φ4mm, Lm=15mm | 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-CTHK miniature stroke unit, shaft φ6mm, ST shaft φ4mm, Lm=20mm | 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-ATHK miniature stroke unit, shaft φ7mm, ST shaft φ5mm, Lm=10mm | 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-BTHK miniature stroke unit, shaft φ7mm, ST shaft φ5mm, Lm=15mm | 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-CTHK miniature stroke unit, shaft φ7mm, ST shaft φ5mm, Lm=20mm | 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-ATHK miniature stroke unit, shaft φ8mm, ST shaft φ6mm, Lm=10mm | 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-BTHK miniature stroke unit, shaft φ8mm, ST shaft φ6mm, Lm=15mm | 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-CTHK miniature stroke unit, shaft φ8mm, ST shaft φ6mm, Lm=20mm | 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

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