{"product_id":"6-pcs-5mm-to-8mm-rigid-shaft-coupler-aluminum-alloy-motor-connector-with-4-screw-locking-for-3d-printer-cnc-size-5mm-to-8mm","title":"6 Pcs 5mm to 8mm Rigid Shaft Coupler – Aluminum Alloy Motor Connector with 4-Screw Locking for 3D Printer \u0026 CNC - size: 5mm to 8mm","description":"\u003ch3\u003eAbout this item\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e【Important – Precision Alignment Required】 – This is a rigid coupling. Requires perfect shaft alignment (eccentricity \u0026lt;0.05mm) for proper operation. For applications with vibration or unavoidable misalignment, use a flexible coupling instead. This 5mm to 8mm coupler is designed for precision applications where shafts are perfectly aligned.\u003c\/li\u003e\n\u003cli\u003e【Secure 4-Screw Locking Mechanism】 – Features a top-tight design with 4 set screws (90° distribution) gripping the 5mm shaft firmly without slipping. This 4-screw locking system eliminates detachment risk during high-speed rotation – a stable CNC motor coupler for stepper motors and CNC machines.\u003c\/li\u003e\n\u003cli\u003e【Durable \u0026amp; Heat-Resistant Build】 – Crafted from anodized aluminum in a professional blue finish – resistant to corrosion, oil, and heat. This aluminum coupling ensures long service life even in continuous operation, reducing maintenance frequency for your automated equipment. The rigid shaft coupler design delivers precise torque transmission from 5mm to 8mm shafts.\u003c\/li\u003e\n\u003cli\u003e【Complete Installation Kit】 – Includes 6 couplers (5mm to 8mm bore) + matching hex wrench + pre-installed screws. No extra tools needed – simply slide onto shafts and tighten. Size: 14mm OD × 25mm length. Note: Ensure both shafts are perfectly aligned before tightening to prevent bearing damage. This shaft coupler kit is ready to use out of the box.\u003c\/li\u003e\n\u003cli\u003e【Wide Application Range】 – Perfect for connecting NEMA 17 stepper motors (5mm shaft) to lead screws or components with 8mm shafts. Suitable for 3D printers, CNC machines, encoders, and precision robotics.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOverview\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFastener Type:\u003c\/strong\u003e Set Screw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size:\u003c\/strong\u003e M4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Anodized\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Blue\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Brand: RiseDirectly","offers":[{"title":"Default Title","offer_id":67577002950876,"sku":"B0GS2TVVMF-size-5mm-to-8mm","price":13.26,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0837\/0913\/3020\/files\/41-qEv1uBKL.jpg?v=1790468534","url":"https:\/\/stemora.us\/products\/6-pcs-5mm-to-8mm-rigid-shaft-coupler-aluminum-alloy-motor-connector-with-4-screw-locking-for-3d-printer-cnc-size-5mm-to-8mm","provider":"Stemora","version":"1.0","type":"link"}