The Hook Left HA1-105 (Part #HA1-105) is a genuine JACK original replacement part designed for JACK industrial sewing machines, as well as Singer Blackhead HA1 15 class series models. Manufactured to OEM specifications for precise fit and reliable performance. Equivalent Part Numbers JACK: HA1-105 Compatible Machines This part fits the following industrial sewing machine models: SINGER: Blackhead HA1 15 class Technical Specifications Brand JACK Part Number HA1-105 Part Type Hooks Condition New – OEM Original Looking for a replacement hook left ha1-105 for your JACK industrial sewing machine? This genuine OEM part is also compatible with Singer Blackhead HA1 15 class 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.