The Overlock Upper Knife (Part #20719007) is a genuine JACK original replacement part designed for JACK E4S, C5, C6 and C7 series overlock machines, as well as Siruba 700K, 700L, Speedway SW 7D and Juki MO6800 series models. Manufactured to OEM specifications for precise fit and reliable performance. Equivalent Part Numbers JACK: 20719007 SIRUBA: KR23 Compatible Machines This part fits the following industrial sewing machine models: JACK: E4S series, C5, C6 series, C7 series, E3, C2, C3, E4S-4-M03/333, E4S-3-32R2/223, E4S-5-03/333, E4S-6-03/333, E4S-3-02/233, E5-3-32R2/223, E5-5-03/333, C7-4-M03/333, C7-5-M04/435, C7-3-02/233, C7-6-03/333 SIRUBA: 700K series, 700L series, 737K, 747K, 747L SPEEDWAY: SW 7D series, SW6-4D, SW6-3D, SW6-3D-32R, SW6-5D, SW6-6D, SW7-4D, SW7-5D, SW7-3-32R2/223, SW7-4D/EP/MD JUKI: MO6800 series, MO-6814, MO-6814D Technical Specifications Brand JACK Part Number 20719007 Part Type Knives Condition New – OEM Original Looking for a replacement overlock upper knife for your JACK E4S or C5 overlock machine? This genuine OEM part is also compatible with Siruba 700K, Speedway SW 7D and Juki MO6800 series machines. 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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