{"product_id":"d40mm-l78mm-flexible-plum-shaft-coupler-cnc-stepper-motor-jaw-spider","title":"D40mm L78mm Shaft Coupler Flexible Plum Coupling CNC Stepper Motor Jaw Spider","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eD40mm L78mm Flexible Plum Shaft Coupler — Precision Jaw Spider Coupling for CNC \u0026amp; Stepper Motors\u003c\/h2\u003e\n    \u003cp\u003eWhen misalignment, vibration, or backlash causes positioning errors in your CNC machine or stepper motor drive system, a rigid coupling simply won't cut it. The D40mm L78mm flexible plum coupling is engineered for builders, machinists, and automation engineers who need reliable torque transmission with built-in compensation for angular, parallel, and axial shaft misalignment — without sacrificing rotational accuracy.\u003c\/p\u003e\n    \u003cp\u003eThis jaw spider coupling consists of two aluminum alloy hubs and a polyurethane (PU) spider insert. The outer diameter is 40mm (1.57 in) and the overall length is 78mm (3.07 in). Shaft bore options span from 8mm to 22mm (0.31 in – 0.87 in), covering both same-diameter and stepped-bore configurations. Each hub is secured via set screws for tool-free shaft changes.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include CNC router Z-axis lead screw coupling, 3D printer stepper motor to ball screw connection, laser engraver drive shaft coupling, and general industrial automation flexible shaft coupling for servo and stepper motor applications.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e\n    Compatible with NEMA 23, NEMA 34, and other stepper and servo motors with shaft diameters from 8mm to 22mm. Also suitable for lead screw and ball screw assemblies in CNC and automation systems.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These Flexible Plum Shaft Couplers\u003c\/h2\u003e\n    \u003cdiv class=\"hdiy-list\"\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n        \u003cstrong\u003eAluminum Alloy Hubs\u003c\/strong\u003e\n        \u003cp\u003eBoth coupling hubs are machined from aluminum alloy for a lightweight yet rigid structure that resists deformation under continuous torque loads.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🟡\u003c\/span\u003e\n        \u003cstrong\u003ePolyurethane Spider Insert\u003c\/strong\u003e\n        \u003cp\u003eThe PU jaw spider insert absorbs shock and vibration between hubs, reducing noise and protecting motor bearings from impact loads during direction reversals.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003eWide Bore Range: 8mm – 22mm\u003c\/strong\u003e\n        \u003cp\u003e120 shaft diameter combinations available — both equal-bore (e.g., 10mm × 10mm) and stepped-bore (e.g., 8mm × 14mm) — to match virtually any motor-to-screw pairing.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n        \u003cstrong\u003eMisalignment Compensation\u003c\/strong\u003e\n        \u003cp\u003eAccommodates angular misalignment (typically up to 1°), parallel offset, and axial displacement, reducing stress on motor shafts and linear guide components.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\n        \u003cstrong\u003eSet Screw Clamping\u003c\/strong\u003e\n        \u003cp\u003eEach hub is secured with set screws for a firm, slip-resistant grip on the shaft. No special tools required for installation or shaft swaps.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e\n        \u003cstrong\u003eCNC \u0026amp; Automation Ready\u003c\/strong\u003e\n        \u003cp\u003eDesigned for CNC routers, 3D printers, laser engravers, and industrial automation systems where consistent torque transmission and low backlash are critical.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — Flexible Plum Jaw Shaft Coupler\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003e40mm (1.57 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOverall Length (L)\u003c\/th\u003e\n\u003ctd\u003e78mm (3.07 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eShaft Bore Range\u003c\/th\u003e\n\u003ctd\u003e8mm – 22mm (0.31 in – 0.87 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Configuration\u003c\/th\u003e\n\u003ctd\u003eEqual-bore and stepped-bore (see variant options)\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\u003eCoupling Type\u003c\/th\u003e\n\u003ctd\u003eJaw \/ Plum \/ Spider flexible coupling\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eClamping Method\u003c\/th\u003e\n\u003ctd\u003eSet screw\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAngular Misalignment\u003c\/th\u003e\n\u003ctd\u003eTypically up to 1°\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMax RPM\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMax Torque\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 Pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eAnodized \/ natural aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-faq\"\u003e\n    \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right shaft diameter combination?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSelect the variant that matches your motor shaft diameter (first number) and your lead screw or ball screw shaft diameter (second number). For example, if your NEMA 23 stepper motor has a 10mm shaft and your ball screw has a 12mm shaft, choose the 10mm × 12mm variant. If both shafts are the same size, choose the equal-bore option (e.g., 10mm × 10mm).\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between a plum coupling and a rigid coupling?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA rigid coupling transmits torque with zero flex, which means any shaft misalignment directly stresses the motor bearings and screw supports. A plum (jaw\/spider) coupling uses a flexible PU insert between the two aluminum hubs to absorb angular and parallel misalignment, vibration, and shock loads — extending the service life of your motor and linear components.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs this coupling suitable for NEMA 23 and NEMA 34 stepper motors?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The bore range of 8mm to 22mm covers the standard shaft diameters for NEMA 23 (typically 6.35mm or 8mm) and NEMA 34 (typically 12mm or 14mm) stepper motors. Please verify your motor's exact shaft diameter before ordering. For shafts below 8mm, this specific coupling is not suitable.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong is the aluminum hub — will it deform under high torque?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe hubs are machined from aluminum alloy, which provides a good strength-to-weight ratio for CNC and automation applications. For exact torque ratings, contact us to confirm. The set screw clamping ensures the hub stays firmly seated on the shaft under normal operating loads.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDoes the PU spider insert need to be replaced over time?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe polyurethane spider insert is a wear component that absorbs vibration and shock between the two hubs. In high-cycle or high-load applications, the insert may show wear before the aluminum hubs. The three-piece design (two hubs + one spider) allows you to replace only the insert without replacing the entire coupling, reducing long-term maintenance costs.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use this coupling for a CNC router lead screw or ball screw?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — this is one of the most common applications. The D40mm L78mm flexible plum coupling is widely used to connect stepper or servo motor shafts to lead screws and ball screws on CNC routers, laser engravers, and 3D printers. The flexible insert compensates for minor misalignment between the motor and screw supports, reducing binding and improving positioning accuracy.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat does the \"D40mm L78mm\" designation mean?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e\"D40mm\" refers to the outer diameter of the coupling body (40mm \/ 1.57 in), and \"L78mm\" refers to the total assembled length of the coupling (78mm \/ 3.07 in). These dimensions determine whether the coupling will physically fit within your machine's frame clearance. Always verify available space before ordering.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your shaft diameter combination above, then add to cart.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right shaft diameter combination?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Select the variant that matches your motor shaft diameter (first number) and your lead screw or ball screw shaft diameter (second number). For example, if your NEMA 23 stepper motor has a 10mm shaft and your ball screw has a 12mm shaft, choose the 10mm × 12mm variant. If both shafts are the same size, choose the equal-bore option (e.g., 10mm × 10mm).\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between a plum coupling and a rigid coupling?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A rigid coupling transmits torque with zero flex, which means any shaft misalignment directly stresses the motor bearings and screw supports. A plum (jaw\/spider) coupling uses a flexible PU insert between the two aluminum hubs to absorb angular and parallel misalignment, vibration, and shock loads — extending the service life of your motor and linear components.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this coupling suitable for NEMA 23 and NEMA 34 stepper motors?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The bore range of 8mm to 22mm covers the standard shaft diameters for NEMA 23 (typically 6.35mm or 8mm) and NEMA 34 (typically 12mm or 14mm) stepper motors. Please verify your motor's exact shaft diameter before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong is the aluminum hub — will it deform under high torque?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The hubs are machined from aluminum alloy, which provides a good strength-to-weight ratio for CNC and automation applications. The set screw clamping ensures the hub stays firmly seated on the shaft under normal operating loads. Contact us to confirm exact torque ratings for your application.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does the PU spider insert need to be replaced over time?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The polyurethane spider insert is a wear component that absorbs vibration and shock between the two hubs. In high-cycle or high-load applications, the insert may show wear before the aluminum hubs. The three-piece design allows you to replace only the insert without replacing the entire coupling.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this coupling for a CNC router lead screw or ball screw?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The D40mm L78mm flexible plum coupling is widely used to connect stepper or servo motor shafts to lead screws and ball screws on CNC routers, laser engravers, and 3D printers. The flexible insert compensates for minor misalignment, reducing binding and improving positioning accuracy.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does the D40mm L78mm designation mean?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"D40mm refers to the outer diameter of the coupling body (40mm \/ 1.57 in), and L78mm refers to the total assembled length of the coupling (78mm \/ 3.07 in). These dimensions determine whether the coupling will physically fit within your machine's frame clearance.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"8mm X 8mm \/ 1 Pcs","offer_id":52421834146066,"sku":"LRP18949x1","price":45.61,"currency_code":"USD","in_stock":true},{"title":"9mm X 9mm \/ 1 Pcs","offer_id":52421834178834,"sku":"LRP18950x1","price":45.61,"currency_code":"USD","in_stock":true},{"title":"10mm X 10mm \/ 1 Pcs","offer_id":52421834211602,"sku":"LRP18951x1","price":45.61,"currency_code":"USD","in_stock":true},{"title":"11mm X 11mm \/ 1 Pcs","offer_id":52421834244370,"sku":"LRP18952x1","price":45.61,"currency_code":"USD","in_stock":true},{"title":"12mm X 12mm \/ 1 Pcs","offer_id":52421834277138,"sku":"LRP18953x1","price":45.61,"currency_code":"USD","in_stock":true},{"title":"12.7mm X 12.7mm \/ 1 Pcs","offer_id":52421834309906,"sku":"LRP18954x1","price":45.61,"currency_code":"USD","in_stock":true},{"title":"13mm X 13mm \/ 1 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