Overlock knife/blade compatible across the modern overlock family (JACK E4S/E5/C-series, Speedway SW6/SW7, and equivalents). Knives cross thread counts within the family. The Lower Lopper (Part #20717005) is a genuine JACK original replacement part designed for JACK E4S-4 series overlock machines. Manufactured to OEM specifications for precise fit and reliable performance. Equivalent Part Numbers JACK: 20717005, 20717050 (alt) Compatible Machines This part fits the following industrial sewing machine models: JACK: E4S-4, C7-4, JK-798D, JK-904E, JK-798T, JK-799S, C4 SPEEDWAY: SW7-4D, SW6-4D JUKI: MO-6714, MO-6716, MO-6814, MO-6816 SIRUBA: 747, 757 PEGASUS: M700, EX5200 BROTHER: 3034 Technical Specifications Brand JACK Part Number 20717005 Part Type Lubrication Parts Condition New – OEM Original Looking for a replacement lower lopper for your JACK E4S-4 overlock machine? This genuine OEM part ensures reliable performance and precise fit. Shop with confidence — all parts ship from Miami, FL. ⚠️ Compatibility Notice: Always verify your machine model and subclass number before ordering. Part numbers and compatibility are provided as a reference only. Supra Sewing is not responsible for purchases made without confirming compatibility with your specific machine. All sales on replacement parts are final.
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