{"product_id":"d18-l25-rigid-shaft-coupling-cnc-motor-coupler-3d-printer","title":"D18*L25 Flexible Shaft Coupling Rigid CNC Motor Coupler 3D Printer 3\/4\/5\/6\/7\/8mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eD18*L25 Rigid Shaft Coupling — Zero-Backlash CNC Motor Coupler for Precision Motion Control\u003c\/h2\u003e\n\u003cp\u003eWhen even the slightest rotational play ruins a cut, a print, or a calibration run, engineers and makers need a coupling that transmits torque without compromise. The D18*L25 rigid shaft coupling is designed for CNC router builders, 3D printer enthusiasts, and automation technicians who demand exact shaft alignment and zero backlash in every axis.\u003c\/p\u003e\n\u003cp\u003eThis coupler features a one-piece aluminum alloy body measuring 18mm in outer diameter and 25mm in length (approximately 0.71 in × 0.98 in). Bore combinations range from 3mm to 8mm (approx. 0.12 in to 0.31 in) on each side, with both same-diameter and stepped-bore configurations available. Clamping is achieved via radial set screws for a firm, slip-resistant grip on each shaft end.\u003c\/p\u003e\n\u003cp\u003eTypical applications include connecting NEMA 17 and NEMA 23 stepper motor shafts to lead screws on CNC mills and laser engravers, coupling servo motor outputs to encoder shafts in robotics platforms, and linking motor shafts to ball screws in DIY linear actuator builds — all scenarios where a rigid shaft coupler for stepper motors outperforms flexible alternatives.\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 stepper motors, standard lead screws, ball screws, and encoder shafts with bore diameters from 3mm to 8mm (including 6.35mm \/ ¼ inch). Verify shaft diameters before ordering.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These D18*L25 Rigid Shaft Couplings\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n\u003cstrong\u003eZero-Backlash Rigid Design\u003c\/strong\u003e\n\u003cp\u003eOne-piece construction eliminates rotational play, ensuring direct torque transfer from motor shaft to lead screw with no lost motion.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n\u003cstrong\u003eCompact D18 × L25mm Body\u003c\/strong\u003e\n\u003cp\u003eThe 18mm outer diameter and 25mm length fit into tight motor mounts and carriage assemblies where larger couplers cannot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\n\u003cstrong\u003eWide Bore Range (3–8mm)\u003c\/strong\u003e\n\u003cp\u003eAvailable in 28 bore combinations — same-diameter and stepped — covering the most common stepper motor and lead screw shaft sizes, including the 6.35mm (¼ in) imperial standard.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e\n\u003cstrong\u003eAluminum Alloy Construction\u003c\/strong\u003e\n\u003cp\u003eLightweight yet rigid aluminum alloy body resists deformation under continuous rotational load, keeping shaft alignment stable over long duty cycles.\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\u003eRadial set screws on each bore end clamp firmly to the shaft, preventing axial slip during direction reversals and high-acceleration moves.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n\u003cstrong\u003eFlexible Quantity Options\u003c\/strong\u003e\n\u003cp\u003eOrder as a single piece for a repair or upgrade, or choose 5, 10, or 20-piece packs for machine builds, classroom kits, or workshop stock.\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 — Rigid Shaft Coupling\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (D)\u003c\/th\u003e\n\u003ctd\u003e18mm (approx. 0.71 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLength (L)\u003c\/th\u003e\n\u003ctd\u003e25mm (approx. 0.98 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter (d1)\u003c\/th\u003e\n\u003ctd\u003e3mm – 8mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter (d2)\u003c\/th\u003e\n\u003ctd\u003e3mm – 8mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Combinations\u003c\/th\u003e\n\u003ctd\u003e28 options including 6.35mm (¼ in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eAluminum alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCoupling Type\u003c\/th\u003e\n\u003ctd\u003eRigid (zero-backlash)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eClamping Method\u003c\/th\u003e\n\u003ctd\u003eRadial set screws\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMax Shaft Misalignment\u003c\/th\u003e\n\u003ctd\u003eDesigned for aligned shafts only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Quantities\u003c\/th\u003e\n\u003ctd\u003e1 \/ 5 \/ 10 \/ 20 pcs\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\u003eWhat is the difference between a rigid and a flexible shaft coupling?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA rigid shaft coupling transmits torque with zero rotational play, making it ideal for CNC and 3D printer axes where positional accuracy is critical. A flexible coupling absorbs minor misalignment and vibration but introduces a small amount of backlash. If your shafts are precisely aligned, a rigid coupler delivers more accurate motion.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the correct bore size for my motor and lead screw?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure the outer diameter of both your motor shaft and your lead screw or ball screw shaft with a caliper. Select the variant whose d1 matches your motor shaft and d2 matches your lead screw. Common NEMA 17 motor shafts are 5mm; common lead screws are 8mm. If one shaft is imperial (¼ in = 6.35mm), choose a variant that includes 6.35mm.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this coupler work with my NEMA 17 or NEMA 23 stepper motor?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. NEMA 17 motors typically have a 5mm output shaft, and NEMA 23 motors commonly use 6.35mm or 8mm shafts. Both are covered by the available bore combinations. Confirm your motor's shaft diameter in its datasheet before selecting a variant.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this coupling suitable for high-speed or high-torque applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThis D18*L25 rigid coupler is well-suited for the torque and speed ranges typical of CNC routers, 3D printers, and light automation equipment. For very high-torque industrial drives or applications with significant shaft misalignment, consult the torque rating of your specific motor and verify that a rigid coupling is appropriate — misaligned shafts can cause bearing wear when using rigid couplers.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes aluminum corrode, and how should I maintain this coupler?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eAluminum alloy forms a natural oxide layer that resists corrosion in typical indoor workshop and machine environments. For humid or mildly corrosive environments, a light coat of machine oil on the exterior is sufficient. Keep the set screw threads clean and re-torque periodically if the machine experiences heavy vibration.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I install and secure the coupler to the shafts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSlide each shaft end into the corresponding bore until it reaches the center of the coupler body. Align the shafts as precisely as possible — rigid couplers do not compensate for misalignment. Tighten the set screws on each side with an appropriate hex key until firm. Avoid over-tightening, which can deform the bore or damage the shaft surface.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eShould I order a single piece or a multi-pack?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eIf you are replacing a single coupler or testing a design, the 1-piece option is the most economical starting point. For full machine builds with multiple axes, the 5 or 10-piece packs offer a lower per-unit cost. The 20-piece pack is suited for classroom kits, batch production, or workshop inventory.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your Hole (d1 × d2) size and quantity 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\": \"What is the difference between a rigid and a flexible shaft coupling?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A rigid shaft coupling transmits torque with zero rotational play, making it ideal for CNC and 3D printer axes where positional accuracy is critical. A flexible coupling absorbs minor misalignment and vibration but introduces a small amount of backlash. If your shafts are precisely aligned, a rigid coupler delivers more accurate motion.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the correct bore size for my motor and lead screw?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure the outer diameter of both your motor shaft and your lead screw or ball screw shaft with a caliper. Select the variant whose d1 matches your motor shaft and d2 matches your lead screw. Common NEMA 17 motor shafts are 5mm; common lead screws are 8mm. If one shaft is imperial (1\/4 in = 6.35mm), choose a variant that includes 6.35mm.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this coupler work with my NEMA 17 or NEMA 23 stepper motor?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. NEMA 17 motors typically have a 5mm output shaft, and NEMA 23 motors commonly use 6.35mm or 8mm shafts. Both are covered by the available bore combinations. Confirm your motor's shaft diameter in its datasheet before selecting a variant.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this coupling suitable for high-speed or high-torque applications?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This D18*L25 rigid coupler is well-suited for the torque and speed ranges typical of CNC routers, 3D printers, and light automation equipment. For very high-torque industrial drives or applications with significant shaft misalignment, consult the torque rating of your specific motor and verify that a rigid coupling is appropriate.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does aluminum corrode, and how should I maintain this coupler?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Aluminum alloy forms a natural oxide layer that resists corrosion in typical indoor workshop and machine environments. For humid or mildly corrosive environments, a light coat of machine oil on the exterior is sufficient. Keep the set screw threads clean and re-torque periodically if the machine experiences heavy vibration.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I install and secure the coupler to the shafts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Slide each shaft end into the corresponding bore until it reaches the center of the coupler body. Align the shafts as precisely as possible. Tighten the set screws on each side with an appropriate hex key until firm. Avoid over-tightening, which can deform the bore or damage the shaft surface.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Should I order a single piece or a multi-pack?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If you are replacing a single coupler or testing a design, the 1-piece option is the most economical starting point. For full machine builds with multiple axes, the 5 or 10-piece packs offer a lower per-unit cost. The 20-piece pack is suited for classroom kits, batch production, or workshop inventory.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"3mm * 3mm \/ 1","offer_id":52421711069458,"sku":"LXDLIIIIU0001x1","price":4.75,"currency_code":"USD","in_stock":true},{"title":"3mm * 4mm \/ 1","offer_id":52421711102226,"sku":"LXDLIIIIU0002x1","price":4.75,"currency_code":"USD","in_stock":true},{"title":"3mm * 5mm \/ 1","offer_id":52421711134994,"sku":"LXDLIIIIU0003x1","price":4.75,"currency_code":"USD","in_stock":true},{"title":"3mm * 6mm \/ 1","offer_id":52421711167762,"sku":"LXDLIIIIU0004x1","price":4.75,"currency_code":"USD","in_stock":true},{"title":"3mm * 6.35mm \/ 1","offer_id":52421711200530,"sku":"LXDLIIIIU0005x1","price":4.75,"currency_code":"USD","in_stock":true},{"title":"3mm * 8mm \/ 1","offer_id":52421711233298,"sku":"LXDLIIIIU0006x1","price":4.75,"currency_code":"USD","in_stock":true},{"title":"4mm * 4mm \/ 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