Strong H KR23C Heavy Duty Upper Knife for Siruba 757

Upgrade your workshop’s cutting precision with the premium Strong H KR23C Broad Upper Knife. Manufactured by Strong H, a global leader in industrial sewing cutting components, this upper blade is built to original factory dimensions to ensure perfect timing and clean fabric slicing on your Siruba 757 overlock machine.

Optimized for Heavy Fabric Performance

Standard overlock knives can quickly dull or deflect when cutting through dense, heavy-duty textiles. The KR23C broad upper knife features an optimized edge profile designed to easily shear through multiple layers of thick denim, canvas, fleece, or workwear, ensuring a clean edge preparation before the 5-thread seaming process.

Key Features & Technical Specifications

• Premium Steel Alloy: Crafted from high-wear industrial tool steel to maintain maximum sharpness and resist chipping during high-speed factory operation.

• Exact Siruba 757 Fit: Direct drop-in replacement part calibrated for the standard knife holder assembly of the Siruba 700F / 757 series.

• Clean Seams, No Snagging: Provides clean, distortion-free cuts that prevent ragged fabric edges from interfering with looper threads.

Looking for the Full Parts Book?

If you need to verify nearby assembly hardware like the lower knife or locking screws, you can directly access the official manual. Click to download the Siruba 700F Parts Book for complete schematic references.