RS-100-8 4-Inch Octagonal HSS Rotary Blade for Speedway SP100DD & 4" Handheld Cutters - Generic High Speed Steel Replacement Knife

Round-knife blade for industrial cloth cutting machines. Fits 4-inch round cutters (Speedway SP100DD, KM RS/RC series, Eastman Falcon).

The RS-100-8 (marked RS-100(8)) is a 4-inch (100 mm) octagonal high-speed-steel (HSS) rotary blade — a generic aftermarket replacement cutting knife for 4-inch handheld rotary cloth cutters. The eight-sided blade profile is engineered to shear cleanly through stacked fabric plies, and the hardened HSS steel holds a sharp edge far longer than standard carbon-steel blades, resisting the heat build-up that dulls lesser knives on long production runs.

This is a direct drop-in replacement blade: the center mounting hole with its four-notch drive pattern and two locating pin holes matches the standard 4-inch handheld cutter mount, so it seats and locks without modification.

Machine Compatibility — Available at Supra Sewing

• SPEEDWAY SP100DD — 4-Inch Direct Drive Servo Motor Cutting Machine

Compatible Cutters

• Speedway SP100DD and other 4-inch (100 mm) handheld rotary cloth cutters
• Standard 4-inch octagonal-blade rotary cutter platforms using the RS-100 / RS-100(8) blade format

Cross-Reference

• RS-100-8
• RS-100(8)
• RSD-100
• 4" Octagonal HSS Rotary Blade

Technical Specifications

Ideal For

• Replacing a worn, chipped, or dull blade on a 4-inch handheld rotary cutter
• Keeping a spare cutting edge on hand for production downtime
• Cutting stacked plies of woven and knit fabric, and light-to-medium materials
• Garment, upholstery, and general textile cutting shops running 4-inch rotary cutters

Compatible Machines

• SPEEDWAY: SP100DD 4 inch
• KM: RS-100, RS-100N, RC-100, RC-280
• EASTMAN: Falcon, Falcon II