The R12-2T3-FSI appears to be a specific part number from Hiwin, referring to a precision Rolled ball screw. Let’s break down what each part of the code typically represents in Hiwin’s product naming convention:

🔧 Hiwin R12-2T3-FSI Ball Screw – Breakdown

• R12:
  This usually indicates the nominal diameter (12 mm) of the ball screw shaft.

• 2T3:
  This likely refers to:

  • Lead (2 mm): Indicates how far the nut moves per revolution.

  • The “T3” might refer to the tolerance grade (C3) – a high precision grade commonly used in CNC machines and industrial automation.

• FSI:
  This is a flange-type single nut with internal circulation:

  • F = Flange nut.

  • S = Single nut.

  • I = Internal ball circulation (compact design, less noise).

✅ Typical Features

• High precision (C3 grade)

• Ideal for compact linear motion systems

• Internal circulation ensures quieter and smoother operation

• Used in:

  • CNC machines

  • Robotics

  • Semiconductor machinery

  • Medical equipment

📦 Available with:

• Support units (BK/BF or EK/EF)

• Ball screw nut housing

• Custom lengths with machined ends