{"product_id":"universal-flexible-shaft-coupling-motor-u-joint-connector-45-steel","title":"Universal Flexible Shaft Coupling Coupler Motor U Joint Connector 45# Steel","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eUniversal Flexible Shaft Coupling — Reliable U Joint Connector in 45# Steel\u003c\/h2\u003e\n\u003cp\u003eWhen a worn or mismatched shaft coupling causes vibration, noise, or power loss in your motor drive system, the fix starts with the right universal flexible shaft coupling. These U joint connectors are built for engineers, machine builders, and DIY automation enthusiasts who need a dependable, torque-transmitting connection between shafts that are not perfectly aligned.\u003c\/p\u003e\n\u003cp\u003eEach universal flexible shaft coupling is machined from 45# carbon steel — a medium-carbon steel known for its balanced strength, toughness, and machinability. The range covers inner diameters (I.D.) from 5 mm (0.20 in) to 30 mm (1.18 in), outer diameters (O.D.) from 10 mm (0.39 in) to 48 mm (1.89 in), and lengths from 31 mm (1.22 in) to 123 mm (4.84 in), giving you a wide selection to match your specific shaft and housing dimensions.\u003c\/p\u003e\n\u003cp\u003eTypical applications include CNC machine tool spindle drives, robotic arm joint connections, conveyor and feed-axis motor couplings, and general industrial machinery where angular or parallel shaft misalignment must be accommodated without sacrificing torque transmission efficiency.\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 motor shafts and driven shafts with I.D. from 5 mm to 30 mm. Select the Coupler Size (I.D. × O.D. × Length) that matches your shaft diameters and available installation space. Available in 1 pc, 3 pcs, and 5 pcs quantities.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These Universal Flexible Shaft Couplings\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003cstrong\u003e45# Carbon Steel Construction\u003c\/strong\u003e\n\u003cp\u003eMachined from 45# medium-carbon steel for a strong combination of tensile strength and impact toughness. Suitable for continuous-duty motor coupling applications where cast or aluminum alternatives would wear prematurely.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔄\u003c\/div\u003e\n\u003cstrong\u003eUniversal Joint (U Joint) Design\u003c\/strong\u003e\n\u003cp\u003eThe Cardan-style universal joint design transmits torque across angular misalignment between two shafts, making it suitable for drives where the motor and load axes are not perfectly collinear.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cstrong\u003eWide Size Range\u003c\/strong\u003e\n\u003cp\u003eAvailable in 24 size combinations spanning I.D. 5–30 mm, O.D. 10–48 mm, and lengths 31–123 mm. This breadth covers small servo motor shafts up to larger industrial drive shafts in a single product line.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e⚡\u003c\/div\u003e\n\u003cstrong\u003eEfficient Torque Transmission\u003c\/strong\u003e\n\u003cp\u003eThe rigid steel yoke and cross-pin construction minimizes power loss during torque transfer, maintaining consistent rotational speed and reducing heat buildup compared to elastomeric coupling designs.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🛠️\u003c\/div\u003e\n\u003cstrong\u003eMulti-Pack Options\u003c\/strong\u003e\n\u003cp\u003eAvailable in 1 pc, 3 pcs, and 5 pcs quantities. Multi-pack options reduce per-unit cost for machine builders stocking spares or outfitting multiple axes simultaneously.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔧\u003c\/div\u003e\n\u003cstrong\u003eStraightforward Installation\u003c\/strong\u003e\n\u003cp\u003eStandard bore and yoke dimensions allow direct installation onto motor and driven shafts using set screws or keyway arrangements (confirm bore style for your selected size). No special tooling required for assembly.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003ch2\u003e📐 Technical Specifications — Universal Flexible Shaft Coupling\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eUniversal Flexible Shaft Coupling (U Joint \/ Cardan Style)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e45# Carbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInner Diameter (I.D.) Range\u003c\/th\u003e\n\u003ctd\u003e5 mm – 30 mm (0.20 in – 1.18 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (O.D.) Range\u003c\/th\u003e\n\u003ctd\u003e10 mm – 48 mm (0.39 in – 1.89 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLength Range\u003c\/th\u003e\n\u003ctd\u003e31 mm – 123 mm (1.22 in – 4.84 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCoupler Size (I.D. × O.D. × Length)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eClamping Method\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 \/ 3 pcs \/ 5 pcs (select Amount variant)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTypical Application\u003c\/th\u003e\n\u003ctd\u003eCNC drives, robotic joints, conveyor motors, industrial machinery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Shaft Types\u003c\/th\u003e\n\u003ctd\u003eMotor shafts, lead screws, drive shafts within I.D. range\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight per Unit\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 select the correct coupler size for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure the outer diameter of your motor shaft (this becomes the I.D. of the coupling bore) and the outer diameter of your driven shaft. Then choose the variant whose I.D. matches both shaft diameters. Also check that the O.D. fits within your housing or frame clearance, and that the length suits your shaft-to-shaft gap. If your two shafts have different diameters, contact us to confirm availability of stepped-bore variants.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between a universal joint coupling and a helical flexible coupling?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA universal joint (U joint \/ Cardan joint) uses a cross-pin and yoke mechanism to transmit torque across a significant angular misalignment — typically up to 15–30° depending on the design. A helical flexible coupling is machined from a single piece of metal with a spiral slot and handles only small angular misalignment (typically under 3°) but with near-zero backlash. Choose a U joint when you need to accommodate larger angular offsets between shafts; choose a helical coupling when positional accuracy and zero backlash are the priority.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eIs 45# steel strong enough for my motor coupling application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel (equivalent to SAE 1045) has a typical tensile strength of approximately 600–800 MPa in the normalized condition, making it suitable for most motor coupling applications in CNC machines, conveyors, and light-to-medium industrial drives. For very high-torque or shock-load applications, verify that the selected coupling size's torque rating meets your system requirements. Contact us if you need specific torque capacity data for your chosen size.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow corrosion-resistant is the 45# steel coupling?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel has moderate corrosion resistance — it will oxidize if exposed to moisture without protection. For indoor, dry, or lightly oiled environments (typical of most machine tool and CNC applications), the material performs well. If your application involves exposure to water, coolant mist, or outdoor conditions, consider applying a rust-inhibiting oil or grease to the coupling surfaces, or contact us about surface-treated options.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this coupling to connect shafts of two different diameters?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe standard variants listed have a single I.D. dimension, meaning both bore ends are the same diameter. If your motor shaft and driven shaft have different diameters, check the variant list carefully — some sizes (e.g., 6 × 16 × 42 mm vs. 8 × 16 × 42 mm) share the same O.D. and length but differ in I.D., which may allow you to select a size that fits one shaft while using a shaft adapter or sleeve on the other. Contact us to confirm the best approach for mixed-diameter shaft pairings.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eShould I order 1 pc, 3 pcs, or 5 pcs?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eOrder 1 pc if you need a single replacement or are prototyping a new machine. Order 3 pcs or 5 pcs if you are outfitting multiple axes on the same machine, building a batch of machines, or want to keep spares on hand for maintenance. Multi-pack options offer a lower per-unit cost compared to ordering individual pieces separately.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the maximum angular misalignment this coupling can handle?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eUniversal joint couplings of this type can typically accommodate angular misalignment in the range of 10–30° depending on the specific size and operating speed. Higher misalignment angles reduce the coupling's torque capacity and increase vibration at the output shaft. For best performance and longevity, keep misalignment as low as practically possible and verify the operating angle against the coupling's rated capacity for your chosen size.\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 Coupler Size (I.D. × O.D. × Length) and Amount 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 select the correct coupler size for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure the outer diameter of your motor shaft (this becomes the I.D. of the coupling bore) and the outer diameter of your driven shaft. Then choose the variant whose I.D. matches both shaft diameters. Also check that the O.D. fits within your housing or frame clearance, and that the length suits your shaft-to-shaft gap.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between a universal joint coupling and a helical flexible coupling?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A universal joint uses a cross-pin and yoke mechanism to transmit torque across significant angular misalignment (typically up to 15–30°). A helical flexible coupling handles only small angular misalignment (under 3°) but with near-zero backlash. Choose a U joint for larger angular offsets; choose a helical coupling for positional accuracy.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is 45# steel strong enough for my motor coupling application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel (equivalent to SAE 1045) has a typical tensile strength of approximately 600–800 MPa, suitable for most motor coupling applications in CNC machines, conveyors, and light-to-medium industrial drives.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How corrosion-resistant is the 45# steel coupling?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel has moderate corrosion resistance and will oxidize if exposed to moisture without protection. For indoor or lightly oiled environments it performs well. Apply a rust-inhibiting oil or grease if exposed to water, coolant mist, or outdoor conditions.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this coupling to connect shafts of two different diameters?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Standard variants have a single I.D. dimension for both bore ends. Some sizes share the same O.D. and length but differ in I.D., which may allow fitting one shaft while using a shaft adapter on the other. Contact us to confirm the best approach for mixed-diameter shaft pairings.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Should I order 1 pc, 3 pcs, or 5 pcs?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Order 1 pc for a single replacement or prototype. Order 3 pcs or 5 pcs when outfitting multiple axes, building a batch of machines, or stocking spares. Multi-pack options offer a lower per-unit cost.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the maximum angular misalignment this coupling can handle?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Universal joint couplings of this type can typically accommodate angular misalignment of 10–30° depending on size and operating speed. For best performance, keep misalignment as low as practically possible.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"5 x 10 x 31mm \/ 1pcs","offer_id":52423087096082,"sku":"YULESHXJZC6897x1","price":10.59,"currency_code":"USD","in_stock":true},{"title":"6 x 12 x 34mm \/ 1pcs","offer_id":52423087128850,"sku":"YULESHXJZC6898x1","price":8.77,"currency_code":"USD","in_stock":true},{"title":"8 x 18 x 40mm \/ 1pcs","offer_id":52423087161618,"sku":"YULESHXJZC6899x1","price":11.22,"currency_code":"USD","in_stock":true},{"title":"10 x 20 x 48mm \/ 1pcs","offer_id":52423087194386,"sku":"YULESHXJZC6900x1","price":13.26,"currency_code":"USD","in_stock":true},{"title":"12 x 23 x 56mm \/ 1pcs","offer_id":52423087227154,"sku":"YULESHXJZC6901x1","price":16.17,"currency_code":"USD","in_stock":true},{"title":"14 x 25 x 74mm \/ 1pcs","offer_id":52423087259922,"sku":"YULESHXJZC6902x1","price":19.98,"currency_code":"USD","in_stock":true},{"title":"16 x 30 x 70mm 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