Saeyang Marathon N7 + SH37LN 40K RPM + Pedal

The Saeyang Marathon N7 + SH37LN is a professional e-file set designed for nail technicians who need a stronger stationary unit for manicure, gel removal, and full pedicure work. Current retailer pages position the N7 as a more powerful salon drill with overload protection and stable performance for heavier daily use.

Key Features

• Up to 40,000 RPM
• SH37LN handpiece included
• Pedal included for this SKU/version
• Forward / reverse control
• Overload protection
• Built-in handpiece holder / cradle
• Standard 3/32" / 2.35 mm bit compatibility.

Why It Works Well for Professional Use

This model is best suited for nail techs who want more power and torque than compact 30K units. Seller pages describe the Marathon N7 as a machine that easily handles complete pedicure treatments, while also being suitable for manicure and correction work.

SH37LN Handpiece

The SH37LN is the main performance upgrade in this set. Current listings describe it as a 40,000 RPM handpiece with 4.5 Ncm torque, 210 g weight, and a Twist-Lock chuck for quick bit changes, plus a cooling system for more stable performance during longer sessions.

Pedal

For this product page, it is correct to keep the “+ Pedal” positioning. Your store listing already uses that naming, and current retailer pages also show N7 bundles sold with pedal-equipped configurations, including variable-pedal versions.

Technical Specifications

• Product type: Professional electric nail drill set
• Model: Marathon N7 + SH37LN
• Max speed: 40,000 RPM
• Handpiece torque: 4.5 Ncm
• Bit size: 3/32" / 2.35 mm
• Control unit weight: 1,700 g / 3.75 lb
• Control unit size: 115 × 147 × 96 mm
• Handpiece weight: 210 g.

Best For

This model is a strong choice for nail technicians who want a stationary 40K salon e-file with stronger pedicure capability than lightweight portable systems, especially when torque and stable long-session performance matter.

Important Note

Some seller pages say advanced Saeyang models can switch direction while running, but the safer product-page guidance is still to stop the motor before switching Forward / Reverse. Your source text includes that warning, and it is the safer usage instruction to keep.