BEYOND STFPR/L Boring Bar – Screw-On Type | Internal Turning Toolholders

The BEYOND STFPR/L boring bar series is designed for high-precision internal turning, featuring a robust steel shank and reliable screw-on clamping compatible with TPGT carbide inserts. Fully compliant with ISO toolholder standards, this S-Type boring bar series covers small-diameter internal machining with excellent chip evacuation, vibration control, and long service life.

Main Features

• S-Type screw-on clamping (ISO code: S)
• Compatible with TPGT + edge length inserts
• Steel shank structure providing rigidity and stability
• Triangle insert shape (T) for universal internal turning
• Insert cutting edge angle: F (91°)
• Insert relief angle options based on ISO letter
• Right-hand & left-hand models available
• Multiple bar diameter and length combinations covering small-bore machining

ISO Code Explanation (STFPR/L Series)

• S – Steel Shank (Type of Bar)
• Bar Diameter – Two digits after the first letter (e.g., 20 = Ø20mm)
• Bar Length – Letter following diameter (Q, R, N, M, K, etc.)
• S – Screw-On Clamping (Clamping Method)
• T – Triangle Insert (Insert Shape)
• F – 91° Cutting Edge Angle
• P / B / C / D / E / N – Insert Relief Angle
• R / L – Hand of Tool (Right / Left)
• 08, 09, 11 – Length of Insert Cutting Edge

Compatible Insert Type

The STFPR/L boring bars use the insert model: TPGT + last two digits Example: TPGT1102, TPGT0902, TPGT0802

Available Models & Specifications

Typical Applications

• Internal turning and profiling
• Small-diameter boring operations
• Finishing & semi-finishing
• Steel, stainless steel, cast iron
• Precision machining with carbide inserts

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