{"product_id":"shaft-coupler-flexible-single-double-joint-universal-coupling-cnc-motor-40cr","title":"Shaft Coupler Flexible Single\/Double Joint Universal Coupling CNC Motor 40Cr","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eFlexible Shaft Coupler — Precision Universal Coupling for CNC Motors \u0026amp; Drives\u003c\/h2\u003e\n\u003cp\u003eWhen misalignment between motor and driven shaft causes vibration, premature wear, or lost motion in your CNC machine, 3D printer, or automation rig, a rigid coupling simply won't cut it. These flexible shaft couplers are engineered for DIYers, machinists, and automation builders who need reliable torque transmission even when shafts are slightly offset, angular, or axially displaced.\u003c\/p\u003e\n\u003cp\u003eEach coupler is machined from 40Cr alloy steel — a chromium-alloyed structural steel known for its tensile strength, toughness, and resistance to fatigue. Available in single-joint (Type A) and double-joint (Type B) configurations, sizes span inner diameters from 6 mm (~0.24 in) to 20 mm (~0.79 in), outer diameters from 12 mm to 42 mm, and lengths from 31 mm (~1.22 in) to 94 mm (~3.70 in). The 07G Type B variant features a black surface treatment for added corrosion resistance.\u003c\/p\u003e\n\u003cp\u003eTypical applications include CNC router spindle-to-motor connections, stepper motor shaft coupling for 3D printer Z-axis drives, servo motor linkages in robotic arms, and flexible universal joint replacement in light industrial machinery. The multi-pack options (1, 2, 3, 5, or 10 pcs) make these couplers practical for both single-machine repairs and workshop stock.\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 standard CNC motor shafts, stepper motors, servo motors, and light industrial drives with shaft diameters ID6–ID20 mm. Verify your shaft ID and OD clearance before ordering.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These Flexible Shaft Couplers\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e⚙️\u003c\/div\u003e\n\u003cstrong\u003e40Cr Alloy Steel Construction\u003c\/strong\u003e\n\u003cp\u003eMachined from chromium-alloyed 40Cr steel for high tensile strength, fatigue resistance, and long service life under cyclic torque loads.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔄\u003c\/div\u003e\n\u003cstrong\u003eSingle \u0026amp; Double Joint Options\u003c\/strong\u003e\n\u003cp\u003eType A single-joint couplers handle moderate angular misalignment; Type B double-joint couplers accommodate larger offset angles for more demanding drive layouts.\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\u003eInner diameters from 6 mm to 20 mm and lengths from 31 mm to 94 mm cover the most common CNC motor and servo shaft sizes in one product family.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🛡️\u003c\/div\u003e\n\u003cstrong\u003eBlack Surface Treatment (07G Type B)\u003c\/strong\u003e\n\u003cp\u003eThe largest double-joint variant features a black oxide or coating finish that improves surface corrosion resistance and reduces light reflection in precision setups.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📦\u003c\/div\u003e\n\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e\n\u003cp\u003eOrder 1, 2, 3, 5, or 10 pieces per SKU — ideal for single repairs, spare-parts kits, or stocking a workshop with matched couplers across multiple machines.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🎯\u003c\/div\u003e\n\u003cstrong\u003ePrecision-Machined Bores\u003c\/strong\u003e\n\u003cp\u003eBores are machined to close tolerances to minimize runout and ensure concentric shaft engagement, reducing vibration at operating speeds.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003ch2\u003e📐 Technical Specifications — Flexible Shaft Couplers\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e40Cr Alloy Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eJoint Type\u003c\/th\u003e\n\u003ctd\u003eSingle Joint (Type A) \/ Double Joint (Type B)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInner Diameter (ID) Range\u003c\/th\u003e\n\u003ctd\u003e6 mm – 20 mm (0.24 in – 0.79 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD) Range\u003c\/th\u003e\n\u003ctd\u003e12 mm – 42 mm (0.47 in – 1.65 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLength (L) Range\u003c\/th\u003e\n\u003ctd\u003e31 mm – 94 mm (1.22 in – 3.70 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eNatural machined (Type A) \/ Black treated (07G Type B)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity Options\u003c\/th\u003e\n\u003ctd\u003e1 \/ 2 \/ 3 \/ 5 \/ 10 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTorque Capacity\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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\u003eWeight (per piece)\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 between Type A (single joint) and Type B (double joint)?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eType A single-joint couplers are suited for applications with small angular misalignment (typically up to ~5°) between the motor and driven shaft. Type B double-joint couplers can handle larger angular offsets and are better for layouts where the motor and shaft centerlines cannot be closely aligned. If your setup has significant parallel or angular offset, choose Type B.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhich size coupler do I need for my CNC motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your motor output shaft diameter (the ID you need) and the driven shaft diameter. Then check the OD to confirm it clears your housing or frame. The variant names list ID × OD × L in millimeters — for example, \"ID10 x OD20 x L42mm\" means a 10 mm bore, 20 mm outer diameter, and 42 mm total length.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eIs 40Cr steel strong enough for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e40Cr is a chromium-alloyed structural steel with a tensile strength typically in the range of 900–1100 MPa after heat treatment. It is widely used in mechanical transmission components, shafts, and couplings for light to medium industrial loads. For very high-torque or shock-load applications, verify the specific torque rating of the variant you select against your system requirements.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill these couplers rust or corrode?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e40Cr steel is not stainless and will oxidize if exposed to moisture without protection. The standard Type A variants have a natural machined finish — apply a light machine oil or grease if used in humid environments. The 07G Type B variant includes a black surface treatment that provides additional corrosion resistance for exposed installations.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these couplers on stepper motors for 3D printers?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. These flexible shaft couplers are commonly used on 3D printer Z-axis lead screw drives where the stepper motor shaft and lead screw may have slight misalignment. Select the variant whose ID matches your stepper motor shaft diameter (typically 5 mm, 6.35 mm, or 8 mm) — the ID8 variants are a common fit for NEMA 17 and NEMA 23 motors.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the standard Type A variants and the \"GD\" variants (01GD, 1GD)?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe GD-suffix variants (01GD, 1GD) have a longer overall length (L58 mm and L68 mm respectively) compared to their standard counterparts at the same ID and OD. The extended length provides more flexibility and a longer working section, which can be useful when greater axial travel or a softer coupling action is needed between the motor and driven shaft.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eDo the multi-pack options include the same size coupler?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. When you select a pack quantity of 2, 3, 5, or 10 pcs, all pieces in the pack are identical — same type, same ID × OD × L dimensions. Multi-packs are priced at a lower per-unit cost than single-piece orders, making them economical for workshop stock or multi-machine builds.\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 Type, Size, and Pack 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\": \"How do I choose between Type A (single joint) and Type B (double joint)?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Type A single-joint couplers are suited for small angular misalignment (typically up to ~5°). Type B double-joint couplers handle larger angular offsets. Choose Type B when motor and shaft centerlines cannot be closely aligned.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which size coupler do I need for my CNC motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your motor output shaft diameter (ID) and driven shaft diameter. Check the OD clears your housing. Variant names list ID × OD × L in millimeters — e.g., ID10 x OD20 x L42mm means 10 mm bore, 20 mm OD, 42 mm length.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is 40Cr steel strong enough for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"40Cr alloy steel has tensile strength typically 900–1100 MPa after heat treatment, suitable for light to medium industrial torque loads. Verify the specific torque rating against your system requirements for high-torque or shock-load applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these couplers rust or corrode?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"40Cr steel is not stainless and will oxidize without protection. Apply light machine oil for Type A variants in humid environments. The 07G Type B variant includes a black surface treatment for additional corrosion resistance.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these couplers on stepper motors for 3D printers?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. These couplers are commonly used on 3D printer Z-axis lead screw drives. Select the variant whose ID matches your stepper motor shaft diameter — ID8 variants fit many NEMA 17 and NEMA 23 motors.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between standard Type A variants and the GD variants (01GD, 1GD)?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"GD-suffix variants have a longer overall length (L58 mm and L68 mm) compared to standard counterparts at the same ID and OD. The extended length provides more flexibility and a longer working section for greater axial travel or softer coupling action.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do the multi-pack options include the same size coupler?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. All pieces in a 2, 3, 5, or 10 pcs pack are identical — same type, same ID × OD × L dimensions. Multi-packs offer a lower per-unit cost than single-piece orders.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"00G (Type A) \/ ID6 x OD12 x L31mm \/ 1 pcs","offer_id":52421838995730,"sku":"FOB09096x1","price":10.88,"currency_code":"USD","in_stock":true},{"title":"01G (Type A) \/ ID8 x OD16 x L36mm \/ 1 pcs","offer_id":52421839028498,"sku":"FOB09097x1","price":9.89,"currency_code":"USD","in_stock":true},{"title":"1G (Type A) \/ ID10 x OD20 x L42mm \/ 1 pcs","offer_id":52421839061266,"sku":"FOB09098x1","price":12.21,"currency_code":"USD","in_stock":true},{"title":"02G (Type A) \/ ID12 x OD23 x L52mm \/ 1 pcs","offer_id":52421839094034,"sku":"FOB09099x1","price":16.43,"currency_code":"USD","in_stock":true},{"title":"03GG (Type A) \/ ID12 x OD25 x L59mm \/ 1 pcs","offer_id":52421839126802,"sku":"FOB09100x1","price":22.07,"currency_code":"USD","in_stock":true},{"title":"03G (Type A) \/ ID14 x OD25 x L59mm \/ 1 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