{"product_id":"6-22mm-d40l55-flexible-jaw-coupler-cnc-shaft-spider-stepper-motor-plum-coupling","title":"6-22mm D40L55 Flexible Jaw Coupler CNC Shaft Spider Stepper Motor Plum Coupling","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eD40L55 Flexible Jaw Coupler — Precision Shaft Coupling for CNC \u0026amp; Stepper Motor Drives\u003c\/h2\u003e\n\u003cp\u003eWhen shaft misalignment or motor vibration causes premature wear on your CNC machine, 3D printer, or automation rig, the coupling is almost always the culprit. Engineers and DIY builders who demand smooth, low-backlash power transmission rely on the D40L55 flexible jaw coupler to bridge motor and lead screw without transferring shock loads or angular error.\u003c\/p\u003e\n\u003cp\u003eThis plum-style spider coupling consists of two aluminum hubs (outer diameter 40 mm \/ 1.57 in, length 55 mm \/ 2.17 in total) and a polyurethane spider insert. Inner bore sizes range from 6 mm to 22 mm (approx. 0.24 in – 0.87 in), covering the most common NEMA stepper motor shaft and lead-screw combinations. Each hub is secured with a radial clamping screw for a firm, slip-free grip.\u003c\/p\u003e\n\u003cp\u003eTypical applications include CNC router Z-axis and X\/Y drives, NEMA 17\/23 stepper motor to ball-screw connections, servo motor test benches, and light-duty rotary encoder mounts — anywhere a flexible jaw coupler for stepper motor is needed to absorb torsional shock and compensate for minor parallel or angular misalignment.\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\u003eCompatible with:\u003c\/strong\u003e NEMA 17 \u0026amp; NEMA 23 stepper motors · Ball screws \u0026amp; lead screws (T8, T12, SFU1204, SFU1605) · Servo motor shafts · CNC router, 3D printer, and laser engraver drive systems\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These D40L55 Flexible Jaw Spider Couplings\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\n\u003cstrong\u003eWide Bore Range 6–22 mm\u003c\/strong\u003e\n\u003cp\u003e23 inner-size variants from 6×6 mm up to 8×22 mm let you match both motor shaft and lead-screw diameters in a single coupling without adapters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\n\u003cstrong\u003eVibration \u0026amp; Shock Absorption\u003c\/strong\u003e\n\u003cp\u003eThe polyurethane spider insert cushions torsional impulses from stepper motor step pulses, reducing resonance and protecting downstream components.\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 up to typically 1°–3° and parallel offset up to ~0.2 mm, keeping your axis running true even when mounting isn't perfect.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n\u003cstrong\u003eAluminum Alloy Hubs\u003c\/strong\u003e\n\u003cp\u003eLightweight yet rigid 6061-series aluminum hubs resist corrosion and keep rotational inertia low — critical for responsive stepper motor acceleration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e\n\u003cstrong\u003eRadial Clamping Screw Design\u003c\/strong\u003e\n\u003cp\u003eSet-screw clamping on each hub provides a secure, tool-adjustable grip on the shaft, preventing axial slip under load reversals common in CNC cutting cycles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n\u003cstrong\u003eDrop-In Replacement Spider Insert\u003c\/strong\u003e\n\u003cp\u003eThe polyurethane spider is a separate, replaceable element — swap it out for a stiffer or softer durometer without replacing the entire coupling assembly.\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 Jaw Coupler\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (D)\u003c\/th\u003e\n\u003ctd\u003e40 mm (1.57 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOverall Length (L)\u003c\/th\u003e\n\u003ctd\u003e55 mm (2.17 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInner Bore Range\u003c\/th\u003e\n\u003ctd\u003e6 mm – 22 mm (0.24 in – 0.87 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Configuration\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 (6061-series)\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\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural anodized \/ mill finish\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFastening 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\u003c\/th\u003e\n\u003ctd\u003eTypically 1°–3°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eParallel Offset Tolerance\u003c\/th\u003e\n\u003ctd\u003eTypically ≤ 0.2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMax Recommended RPM\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCoupling Style\u003c\/th\u003e\n\u003ctd\u003eJaw \/ Spider (Plum)\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 bore size for my stepper motor and lead screw?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure the output shaft diameter of your motor (commonly 5 mm for NEMA 17, 6.35 mm or 8 mm for NEMA 23) and the lead-screw or ball-screw shaft diameter separately. Select the variant whose two bore dimensions match — for example, 6×10 mm means one hub bored to 6 mm and the other to 10 mm. If both shafts are the same diameter, choose a matching pair such as 6×6 mm or 8×8 mm.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan this coupling handle the torque of a NEMA 23 stepper motor?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe D40L55 jaw coupler is rated for light-to-medium duty CNC and automation loads. NEMA 23 motors in typical CNC router or 3D printer applications operate well within the coupling's torsional capacity. For high-torque servo drives or heavy milling applications, verify the rated torque against your motor's holding torque specification before ordering.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs the spider insert replaceable, and what hardness options are available?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — the polyurethane spider is a separate component that can be removed and replaced without disturbing the hubs. Standard inserts are medium-durometer PU, which balances vibration damping with torsional stiffness. If you need a stiffer insert for higher-precision positioning, contact us to confirm availability of alternative durometer options.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow corrosion-resistant are the aluminum hubs?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe 6061-series aluminum hubs form a natural oxide layer that provides good resistance to moisture and mild chemicals in typical workshop environments. For exposure to coolant mist in CNC machining, the anodized finish adds an additional protective barrier. They are not recommended for prolonged immersion in harsh acids or salt-spray environments.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this coupler fit a T8 lead screw and a NEMA 17 motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA standard T8 lead screw has an 8 mm shaft, and most NEMA 17 motors have a 5 mm output shaft. You would need the 5×8 mm variant — however, the current range starts at 6 mm minimum bore. If your motor shaft is 5 mm, please contact us to confirm availability of a 5×8 mm option, or consider a 6 mm bore with a 5-to-6 mm shaft adapter sleeve.\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 until it bottoms out or reaches the desired engagement depth. Use the supplied hex key to tighten the radial set screw firmly — typically 1.5–2 N·m for M3 screws. Avoid over-tightening, which can deform the bore. After initial run-in (approximately 30 minutes of operation), re-check and re-torque the screws as the spider insert may compress slightly under load.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between a jaw coupler and a rigid coupler for CNC use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA rigid coupler transmits torque with zero compliance — any shaft misalignment creates bearing side-loads and accelerated wear. A jaw (spider) coupler like this D40L55 introduces a small amount of controlled flex through the polyurethane insert, absorbing vibration and compensating for minor misalignment without sacrificing positional accuracy for typical CNC routing and 3D printing tasks.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your Inner Size 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 bore size for my stepper motor and lead screw?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure the output shaft diameter of your motor (commonly 5 mm for NEMA 17, 6.35 mm or 8 mm for NEMA 23) and the lead-screw or ball-screw shaft diameter separately. Select the variant whose two bore dimensions match. If both shafts are the same diameter, choose a matching pair such as 6x6 mm or 8x8 mm.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can this coupling handle the torque of a NEMA 23 stepper motor?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The D40L55 jaw coupler is rated for light-to-medium duty CNC and automation loads. NEMA 23 motors in typical CNC router or 3D printer applications operate well within the coupling's torsional capacity.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is the spider insert replaceable, and what hardness options are available?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — the polyurethane spider is a separate component that can be removed and replaced without disturbing the hubs. Standard inserts are medium-durometer PU. Contact us to confirm availability of alternative durometer options.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How corrosion-resistant are the aluminum hubs?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The 6061-series aluminum hubs form a natural oxide layer providing good resistance to moisture and mild chemicals. The anodized finish adds additional protection for CNC coolant mist environments.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this coupler fit a T8 lead screw and a NEMA 17 motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A standard T8 lead screw has an 8 mm shaft and most NEMA 17 motors have a 5 mm output shaft. The current bore range starts at 6 mm minimum. Contact us to confirm availability of a 5x8 mm option.\"\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. Tighten the radial set screw to approximately 1.5–2 N·m for M3 screws. Re-check after initial run-in as the spider insert may compress slightly under load.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between a jaw coupler and a rigid coupler for CNC use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A rigid coupler transmits torque with zero compliance — any misalignment creates bearing side-loads. A jaw coupler introduces controlled flex through the polyurethane insert, absorbing vibration and compensating for minor misalignment without sacrificing positional accuracy for typical CNC and 3D printing tasks.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"6x6mm","offer_id":52421816811794,"sku":"HLS606-0","price":12.43,"currency_code":"USD","in_stock":true},{"title":"6x8mm","offer_id":52421816844562,"sku":"HLS606-1","price":12.43,"currency_code":"USD","in_stock":true},{"title":"6x10mm","offer_id":52421816877330,"sku":"HLS606-2","price":12.43,"currency_code":"USD","in_stock":true},{"title":"6x12mm","offer_id":52421816910098,"sku":"HLS606-3","price":12.43,"currency_code":"USD","in_stock":true},{"title":"6x14mm","offer_id":52421816942866,"sku":"HLS606-4","price":12.43,"currency_code":"USD","in_stock":true},{"title":"6x15mm","offer_id":52421816975634,"sku":"HLS606-5","price":12.43,"currency_code":"USD","in_stock":true},{"title":"6x16mm","offer_id":52421817008402,"sku":"HLS606-6","price":12.43,"currency_code":"USD","in_stock":true},{"title":"6x17mm","offer_id":52421817041170,"sku":"HLS606-7","price":12.43,"currency_code":"USD","in_stock":true},{"title":"6x18mm","offer_id":52421817073938,"sku":"HLS606-8","price":12.43,"currency_code":"USD","in_stock":true},{"title":"6x19mm","offer_id":52421817106706,"sku":"HLS606-9","price":12.43,"currency_code":"USD","in_stock":true},{"title":"6x20mm","offer_id":52421817139474,"sku":"HLS606-10","price":12.43,"currency_code":"USD","in_stock":true},{"title":"6x22mm","offer_id":52421817172242,"sku":"HLS606-11","price":12.43,"currency_code":"USD","in_stock":true},{"title":"8x8mm","offer_id":52421817205010,"sku":"HLS606-12","price":12.43,"currency_code":"USD","in_stock":true},{"title":"8x10mm","offer_id":52421817237778,"sku":"HLS606-13","price":12.43,"currency_code":"USD","in_stock":true},{"title":"8x12mm","offer_id":52421817270546,"sku":"HLS606-14","price":12.43,"currency_code":"USD","in_stock":true},{"title":"8x14mm","offer_id":52421817303314,"sku":"HLS606-15","price":12.43,"currency_code":"USD","in_stock":true},{"title":"8x15mm","offer_id":52421817336082,"sku":"HLS606-16","price":12.43,"currency_code":"USD","in_stock":true},{"title":"8x16mm","offer_id":52421817368850,"sku":"HLS606-17","price":12.43,"currency_code":"USD","in_stock":true},{"title":"8x17mm","offer_id":52421817401618,"sku":"HLS606-18","price":12.43,"currency_code":"USD","in_stock":true},{"title":"8x18mm","offer_id":52421817434386,"sku":"HLS606-19","price":12.43,"currency_code":"USD","in_stock":true},{"title":"8x19mm","offer_id":52421817467154,"sku":"HLS606-20","price":12.43,"currency_code":"USD","in_stock":true},{"title":"8x20mm","offer_id":52421817499922,"sku":"HLS606-21","price":12.43,"currency_code":"USD","in_stock":true},{"title":"8x22mm","offer_id":52421817532690,"sku":"HLS606-22","price":12.43,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture1of7_fccccc5c-34e7-4a1f-9cec-3247e9127125.jpg?v=1783329964","url":"https:\/\/homediyer.com\/products\/6-22mm-d40l55-flexible-jaw-coupler-cnc-shaft-spider-stepper-motor-plum-coupling","provider":"HomeDIYer","version":"1.0","type":"link"}