{"product_id":"alu-shaft-coupler-flexible-plum-spider-jaw-coupling-stepper-motor-for-3d-printer","title":"Alu Shaft Coupler Flexible Plum Spider Jaw Coupling Stepper Motor for 3D Printer","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eAluminum Jaw Shaft Coupler — Flexible Plum Coupling for Stepper Motors \u0026amp; 3D Printers\u003c\/h2\u003e\n\u003cp\u003eWhen vibration, minor shaft misalignment, or backlash causes positioning errors in your CNC router, 3D printer, or automation rig, a rigid coupling is often the culprit. Engineers, makers, and machine builders who demand smooth, low-backlash power transmission need a coupling that absorbs shock without sacrificing torque accuracy. This aluminum jaw shaft coupler with a flexible plum spider insert is engineered for exactly that application.\u003c\/p\u003e\n\u003cp\u003eEach coupler consists of two precision-machined aluminum alloy hubs and a polyurethane spider (plum) insert seated between them. The outer diameter spans D20mm (0.79 in) to D95mm (3.74 in), with lengths from L25mm (0.98 in) to L126mm (4.96 in). Shaft bore compatibility ranges from 4mm to 55mm depending on the selected coupler dimension, covering the most common stepper motor and servo shaft sizes.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include NEMA 17 and NEMA 23 stepper motor drives on FDM 3D printers and laser engravers, Z-axis and lead-screw connections on CNC milling machines, and servo-to-gearbox shaft connections in light industrial automation. The flexible spider insert accommodates angular, parallel, and axial misalignment, making this a reliable flexible plum jaw coupling for demanding motion control applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits stepper motors (NEMA 14 \/ 17 \/ 23 \/ 34), servo motors, lead screws, and CNC spindle shafts. Shaft bore range 4mm–55mm (varies by coupler size). Confirm your motor shaft diameter and coupler OD before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Aluminum Jaw Shaft Couplers\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003ePrecision Aluminum Hubs\u003c\/strong\u003e\u003cbr\u003eBoth hubs are CNC-machined from aluminum alloy for dimensional accuracy and a secure clamping fit on motor and driven shafts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🌟\u003c\/span\u003e\u003cstrong\u003eFlexible Plum Spider Insert\u003c\/strong\u003e\u003cbr\u003eThe polyurethane spider element absorbs vibration and shock loads, reducing noise and protecting connected components from impact damage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eWide Size Range\u003c\/strong\u003e\u003cbr\u003eAvailable from D20×L25mm up to D95×L126mm with shaft bore compatibility from 4mm to 55mm — one product line covers most stepper and servo motor applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eMisalignment Tolerance\u003c\/strong\u003e\u003cbr\u003eAccommodates angular, parallel, and axial shaft misalignment, reducing stress on bearings and extending the service life of connected machinery.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cstrong\u003eLow Backlash Transmission\u003c\/strong\u003e\u003cbr\u003eThe interference-fit spider insert minimizes rotational play, maintaining positioning accuracy in CNC, 3D printing, and servo-driven systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eMulti-Pack Options\u003c\/strong\u003e\u003cbr\u003eAvailable in packs of 1, 2, 3, or 5 pieces — stock up for multi-axis builds or keep spares on hand for maintenance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Flexible Jaw Shaft Coupler\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eCoupler Type\u003c\/th\u003e\n\u003ctd\u003eJaw \/ Plum Spider (flexible)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Material\u003c\/th\u003e\n\u003ctd\u003eAluminum alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSpider Insert Material\u003c\/th\u003e\n\u003ctd\u003ePolyurethane (PU)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (D)\u003c\/th\u003e\n\u003ctd\u003e20mm – 95mm (0.79 in – 3.74 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLength (L)\u003c\/th\u003e\n\u003ctd\u003e25mm – 126mm (0.98 in – 4.96 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShaft Bore Range\u003c\/th\u003e\n\u003ctd\u003e4mm – 55mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMisalignment Tolerance\u003c\/th\u003e\n\u003ctd\u003eAngular, parallel, and axial (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eClamp Style\u003c\/th\u003e\n\u003ctd\u003eSet screw (grub screw)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 \/ 2 \/ 3 \/ 5 pcs (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eNatural anodized \/ mill finish\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003e3D printers, CNC machines, stepper\/servo motor drives\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right coupler dimension for my stepper motor?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMatch the coupler's shaft bore range to your motor shaft diameter and your driven shaft diameter. For example, a NEMA 17 stepper typically has a 5mm shaft, so any coupler with a bore range that includes 5mm will fit. Then select the outer diameter (D) and length (L) that fits within your machine's available space. Refer to the variant options for the exact bore range of each coupler size.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the purpose of the plum spider insert?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe polyurethane spider insert sits between the two aluminum hubs and acts as a flexible element. It absorbs vibration and shock, accommodates minor shaft misalignment (angular, parallel, and axial), and reduces noise during operation. It also provides a degree of electrical isolation between the two shafts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan this coupler handle angular and parallel misalignment?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The flexible plum spider insert allows the coupler to tolerate angular misalignment (shafts at a slight angle), parallel misalignment (shafts offset laterally), and axial misalignment (shafts slightly apart or compressed). For best results, minimize misalignment during installation to extend the service life of the spider insert.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this coupler suitable for 3D printer lead screw connections?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. This jaw coupling is widely used on 3D printer Z-axis lead screw connections. The flexible spider compensates for minor misalignment between the stepper motor shaft and the lead screw, reducing binding and improving print quality. Select the coupler dimension that matches your motor shaft and lead screw diameter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow is the coupler secured to the shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eEach hub is secured using set screws (grub screws) that clamp onto the shaft. Tighten the set screws firmly with the appropriate hex key after aligning the coupler. For shafts with a flat (D-cut), align the set screw to the flat for a more secure grip and to prevent rotation under load.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill the spider insert wear out, and can it be replaced?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe polyurethane spider insert can wear over time, especially under high-cycle or high-torque conditions. In most jaw couplings, the spider insert is a separate component that can be replaced without replacing the aluminum hubs. If you notice increased backlash or vibration, inspect the spider for wear and replace it as needed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the various coupler sizes (D20 vs D40 vs D95)?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eLarger outer diameters (D) generally correspond to higher torque capacity and larger shaft bore ranges. Smaller couplers (D20–D25mm) are suited for light-duty applications such as small 3D printers and NEMA 14\/17 motors. Mid-range sizes (D30–D45mm) cover NEMA 23 motors and medium CNC axes. Larger sizes (D55–D95mm) are intended for NEMA 34 motors, servo drives, and heavier industrial applications. Always verify the shaft bore range for your selected size.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Coupler Dimension, Shaft Diameter, and Pack Quantity above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"D 20mm x L 25mm \/ 4mm to 10mm \/ 1","offer_id":52421746950418,"sku":"GYWHLYXKJGK0003x1","price":4.61,"currency_code":"USD","in_stock":true},{"title":"D 20mm x L 30mm \/ 4mm to 10mm \/ 1","offer_id":52421746983186,"sku":"GYWHLYXKJGK0004x1","price":4.75,"currency_code":"USD","in_stock":true},{"title":"D 25mm x L 30mm \/ 5mm to 14mm \/ 1","offer_id":52421747015954,"sku":"GYWHLYXKJGK0005x1","price":5.02,"currency_code":"USD","in_stock":true},{"title":"D 25mm x L 35mm \/ 5mm to 14mm \/ 1","offer_id":52421747048722,"sku":"GYWHLYXKJGK0006x1","price":5.83,"currency_code":"USD","in_stock":true},{"title":"D 30mm x L 35mm \/ 5mm to 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