{"product_id":"d30l40-flexible-jaw-shaft-coupler-cnc-stepper-motor-5-16mm","title":"D30L40 CNC Shaft Coupler Flexible Plum Spider Jaw Coupling Stepper Motor 5~16mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eD30L40 Flexible Jaw Shaft Coupler — Precision CNC Coupling for Stepper \u0026amp; Servo Motors\u003c\/h2\u003e\n\u003cp\u003eMisaligned shafts and vibration-induced positioning errors are a constant headache for CNC builders, 3D printer engineers, and automation integrators. The D30L40 CNC Shaft Coupler is engineered for exactly these challenges — delivering reliable torque transmission with built-in flexibility that absorbs angular, parallel, and axial misalignment without stressing your motor bearings.\u003c\/p\u003e\n\u003cp\u003eThis jaw coupling set consists of two aluminum alloy hubs and a polyurethane spider insert (plum-type elastomer). The outer diameter is 30mm (1.18 in) and the overall length is 40mm (1.57 in). Bore diameters span 5mm to 16mm (0.20–0.63 in), with both same-bore and stepped-bore combinations available to suit mixed-shaft assemblies.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include NEMA 17\/23 stepper motor to lead screw connections on CNC routers and laser engravers, servo motor shaft coupling on pick-and-place automation rigs, and encoder shaft linking on precision measurement equipment — all scenarios where a flexible jaw shaft coupler for stepper motors reduces resonance and extends component life.\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\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits NEMA 17, NEMA 23, and equivalent stepper\/servo motors. Compatible with 5mm–16mm round shafts including metric and 1\/4\" (6.35mm) imperial sizes. Verify your motor shaft and lead screw bore before ordering.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These D30L40 Flexible Jaw 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\u003eDual Aluminum Alloy Hubs\u003c\/strong\u003e\n\u003cp\u003eMachined aluminum hubs deliver low rotational inertia and corrosion resistance, keeping coupling weight minimal while maintaining structural rigidity 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 plum-type elastomer spider absorbs shock, dampens vibration, and accommodates angular misalignment up to approximately 1°, parallel offset up to ~0.2mm, and axial displacement — protecting motor bearings from side-load stress.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n\u003cstrong\u003eWide Bore Range: 5mm to 16mm\u003c\/strong\u003e\n\u003cp\u003eAvailable in 90 shaft diameter combinations — same-bore (e.g., 8mm × 8mm) and stepped-bore (e.g., 6mm × 10mm) — making this coupler compatible with a broad range of CNC, 3D printing, and automation shaft pairings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\n\u003cstrong\u003eSet-Screw Clamping Design\u003c\/strong\u003e\n\u003cp\u003eEach hub is secured via radial set screws for tool-free shaft swaps during prototyping. Tighten with a standard hex key for a firm, slip-resistant grip on both smooth and flat-keyed shafts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\n\u003cstrong\u003eZero-Backlash Torque Transmission\u003c\/strong\u003e\n\u003cp\u003eThe jaw-and-spider interface maintains near-zero backlash under normal CNC loads, preserving positional accuracy on lead screw and ball screw driven axes — critical for repeatable machining and printing results.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n\u003cstrong\u003eCompact D30 × L40 Form Factor\u003c\/strong\u003e\n\u003cp\u003eAt 30mm OD and 40mm length, this coupler fits within tight motor-to-screw clearances common in compact CNC frames, desktop routers, and DIY automation enclosures without requiring spacer modifications.\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 — D30L40 Jaw Shaft Coupler\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eCoupling Type\u003c\/th\u003e\n\u003ctd\u003eFlexible Jaw \/ Plum Spider (Oldham-style elastomer)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003e30mm (1.18 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOverall Length\u003c\/th\u003e\n\u003ctd\u003e40mm (1.57 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter Range\u003c\/th\u003e\n\u003ctd\u003e5mm – 16mm (0.20 – 0.63 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShaft Diameter Combination\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Material\u003c\/th\u003e\n\u003ctd\u003eAluminum alloy (anodized)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSpider \/ Insert Material\u003c\/th\u003e\n\u003ctd\u003ePolyurethane elastomer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eClamping Method\u003c\/th\u003e\n\u003ctd\u003eRadial set screw (hex key)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAngular Misalignment Tolerance\u003c\/th\u003e\n\u003ctd\u003eTypically ≤ 1°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eParallel Offset Tolerance\u003c\/th\u003e\n\u003ctd\u003eTypically ≤ 0.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 Pcs (complete coupling set: 2 hubs + 1 spider)\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\u003ctr\u003e\n\u003cth\u003eCompatible Motor Types\u003c\/th\u003e\n\u003ctd\u003eStepper motor, servo motor, encoder shaft\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\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right shaft diameter combination?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure both shafts you need to connect — your motor output shaft and your lead screw or driven shaft — using a digital caliper. Select the variant that matches both diameters exactly (e.g., \"8mm × 10mm\" means one hub bores 8mm and the other bores 10mm). If both shafts are the same size, choose a same-bore option like \"8mm × 8mm\".\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this coupler work with a 1\/4\" (6.35mm) imperial shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The 6.35mm bore variants are specifically sized for 1\/4\" imperial shafts, which are common on North American stepper motors and some servo motors. Look for any variant listing \"6.35mm\" on either side of the combination.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow much misalignment can this jaw coupling handle?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe polyurethane spider insert accommodates angular misalignment of approximately 1° and parallel (radial) offset of up to ~0.2mm. It also handles minor axial displacement. For best longevity, align shafts as closely as possible — the spider compensates for residual misalignment, not gross assembly errors.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this coupling suitable for high-speed applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThis D30L40 jaw coupler is designed for the low-to-medium RPM range typical of CNC stepper and servo motor applications (generally under 3,000 RPM). For very high-speed spindle or motor applications, verify the dynamic balance requirements of your system before use.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes the spider insert need to be replaced over time?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003ePolyurethane spider inserts are wear components. Under normal CNC duty cycles they last a long time, but if you notice increased vibration, audible clicking, or visible cracking of the elastomer, the spider should be replaced. The two aluminum hubs are reusable — only the spider needs periodic replacement.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this coupler on a 3D printer Z-axis lead screw?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes, this is one of the most common applications. The flexible jaw design compensates for minor Z-axis motor-to-lead-screw misalignment that causes Z-banding artifacts in prints. Select the bore combination matching your motor shaft (typically 5mm for NEMA 17) and your lead screw diameter (typically 8mm for T8 screws).\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I install and tighten the set screws correctly?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eInsert each shaft fully into its respective hub bore. Position the coupler so the spider insert sits centered between the two hubs. Using a hex key (Allen wrench), tighten the set screws firmly — do not overtighten, as this can deform the bore. For flat-keyed shafts, align the set screw over the flat before tightening for maximum grip.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\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\": \"Measure both shafts you need to connect using a digital caliper. Select the variant that matches both diameters exactly. If both shafts are the same size, choose a same-bore option.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this coupler work with a 1\/4\\\" (6.35mm) imperial shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The 6.35mm bore variants are specifically sized for 1\/4\\\" imperial shafts common on North American stepper motors and some servo motors.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How much misalignment can this jaw coupling handle?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The polyurethane spider insert accommodates angular misalignment of approximately 1° and parallel offset of up to ~0.2mm, plus minor axial displacement.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this coupling suitable for high-speed applications?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This coupler is designed for low-to-medium RPM typical of CNC stepper and servo motor applications, generally under 3,000 RPM.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does the spider insert need to be replaced over time?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, polyurethane spider inserts are wear components. The aluminum hubs are reusable; only the spider needs periodic replacement when worn.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this coupler on a 3D printer Z-axis lead screw?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Select the bore combination matching your motor shaft (typically 5mm for NEMA 17) and your lead screw diameter (typically 8mm for T8 screws).\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I install and tighten the set screws correctly?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Insert each shaft fully into its hub bore, center the spider between hubs, then tighten set screws with a hex key. Do not overtighten. Align set screws over flat-keyed shaft flats for maximum grip.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"5mm X 5mm \/ 1 Pcs","offer_id":52422041895186,"sku":"LRP18188x1","price":6.77,"currency_code":"USD","in_stock":true},{"title":"6mm X 6mm \/ 1 Pcs","offer_id":52422041927954,"sku":"LRP18189x1","price":7.68,"currency_code":"USD","in_stock":true},{"title":"6.35mm X 6.35mm \/ 1 Pcs","offer_id":52422041960722,"sku":"LRP18190x1","price":7.68,"currency_code":"USD","in_stock":true},{"title":"7mm X 7mm \/ 1 Pcs","offer_id":52422041993490,"sku":"LRP18191x1","price":7.68,"currency_code":"USD","in_stock":true},{"title":"8mm X 8mm \/ 1 Pcs","offer_id":52422042026258,"sku":"LRP18192x1","price":7.68,"currency_code":"USD","in_stock":true},{"title":"9mm X 9mm \/ 1 Pcs","offer_id":52422042059026,"sku":"LRP18193x1","price":7.68,"currency_code":"USD","in_stock":true},{"title":"10mm X 10mm \/ 1 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