{"product_id":"rigid-metal-flange-shaft-coupling-3-8mm-threaded-options","title":"Rigid Metal Flange Shaft Coupling,3–8mm Bores and M3\/M4\/M6 Threaded Options","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\u003cp\u003eThis \u003ca href=\"https:\/\/rcdrone.top\/collections\/gears-transmission-parts\"\u003erigid flange shaft coupling\u003c\/a\u003e connects a matching shaft to a flat surface or mechanism through its round mounting disc. Choose a smooth bore, an internally threaded bore, or a separate set-screw and hex-key accessory. The product selector represents these distinct items rather than interchangeable bore types.\u003c\/p\u003e\u003ch2\u003eFeatures\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eMetal flange and hub for compact mechanical connections.\u003c\/li\u003e\n\u003cli\u003eFive smooth-bore sizes: 3, 4, 5, 6 and 8 mm.\u003c\/li\u003e\n\u003cli\u003eFour face mounting holes on the illustrated smooth-bore flange designs.\u003c\/li\u003e\n\u003cli\u003eOpposing radial set screws secure a matching smooth shaft.\u003c\/li\u003e\n\u003cli\u003eM 3, M 4 andM 6 internally threaded bore alternatives.\u003c\/li\u003e\n\u003cli\u003eSeparate M 3 orM 4 set-screw and hex-key options.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cdiv style=\"overflow-x:auto\"\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct\u003c\/td\u003e\n\u003ctd\u003eMetal rigid flange shaft coupling \/ mounting connection disc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eConnects a matching shaft to a flat mounting surface or attached mechanism\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSmooth bore options\u003c\/td\u003e\n\u003ctd\u003e3 mm, 4 mm, 5 mm, 6 mm and 8 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThreaded bore options\u003c\/td\u003e\n\u003ctd\u003eM 3, M 4 andM 6 internal threaded holes; do not treat them as smooth bores\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeparate accessories\u003c\/td\u003e\n\u003ctd\u003eM 3 orM 4 set screws with hex key; these options do not include a flange\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlange package\u003c\/td\u003e\n\u003ctd\u003eOne selected flange with two fixing set screws and one hex key\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFastener selection\u003c\/td\u003e\n\u003ctd\u003e3\/4\/5\/6 mm bore flanges use M 3 set screws; 8 mm uses M 4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eMetal; exact alloy and surface treatment not specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotor\u003c\/td\u003e\n\u003ctd\u003eDemonstration only; no motor included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003eNo measured source mass; 0.10 kg shipping estimate under current unknown-small-item default\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\u003ch2\u003e3–6 mm Smooth-Bore Dimensions\u003c\/h2\u003e\u003cdiv style=\"overflow-x:auto\"\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSmooth bore sizes\u003c\/td\u003e\n\u003ctd\u003e3 \/4 \/5 \/6 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlange outside diameter\u003c\/td\u003e\n\u003ctd\u003e22 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHub diameter \/ overall length\u003c\/td\u003e\n\u003ctd\u003e10 mm \/12 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlange thickness \/ bottom reference\u003c\/td\u003e\n\u003ctd\u003e2 mm \/8.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFace mounting holes\u003c\/td\u003e\n\u003ctd\u003eFour Ø3.0 mm holes, 16 mm opposite-hole reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRadial fastening\u003c\/td\u003e\n\u003ctd\u003eTwo opposing M 3 set screws\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\u003ch2\u003e8 mm Smooth-Bore Dimensions\u003c\/h2\u003e\u003cdiv style=\"overflow-x:auto\"\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSmooth bore\u003c\/td\u003e\n\u003ctd\u003e8 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlange outside diameter\u003c\/td\u003e\n\u003ctd\u003e32 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHub diameter \/ overall length\u003c\/td\u003e\n\u003ctd\u003e16 mm \/13 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlange thickness \/ bottom reference\u003c\/td\u003e\n\u003ctd\u003e3 mm \/8.3 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFace mounting holes\u003c\/td\u003e\n\u003ctd\u003eFour Ø4.0 mm holes, 24 mm opposite-hole reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRadial fastening\u003c\/td\u003e\n\u003ctd\u003eTwo opposing M 4 set screws\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\u003cp\u003eDimensions are in millimetres. Original drawing segments below preserve the numeric geometry and hole locations. M 3 andM 4 opposing-hole callouts are translated in the tables above. These smooth-bore diagrams do not establish the outer geometry, thread pitch or load rating of the M 3\/M 4\/M 6 internally threaded alternatives; verify the selected threaded fit before installation.\u003c\/p\u003e\u003ch2\u003eSelection Guide\u003c\/h2\u003e\u003cdiv style=\"overflow-x:auto\"\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eItem\u003c\/th\u003e\n\u003cth\u003eSelection note\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e3 mm Smooth Bore Flange\u003c\/td\u003e\n\u003ctd\u003eSmooth shaft size must match the stated bore\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e4 mm Smooth Bore Flange\u003c\/td\u003e\n\u003ctd\u003eSmooth shaft size must match the stated bore\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e5 mm Smooth Bore Flange\u003c\/td\u003e\n\u003ctd\u003eSmooth shaft size must match the stated bore\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e6 mm Smooth Bore Flange\u003c\/td\u003e\n\u003ctd\u003eSmooth shaft size must match the stated bore\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e8 mm Smooth Bore Flange\u003c\/td\u003e\n\u003ctd\u003eSmooth shaft size must match the stated bore\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM 3 Set Screws + Hex Key\u003c\/td\u003e\n\u003ctd\u003eAccessory screws and hex key only; no flange\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM 4 Set Screws + Hex Key\u003c\/td\u003e\n\u003ctd\u003eAccessory screws and hex key only; no flange\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM 3 Threaded-Bore Flange\u003c\/td\u003e\n\u003ctd\u003eInternally threaded flange; confirm mating thread and dimensions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM 4 Threaded-Bore Flange\u003c\/td\u003e\n\u003ctd\u003eInternally threaded flange; confirm mating thread and dimensions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM 6 Threaded-Bore Flange\u003c\/td\u003e\n\u003ctd\u003eInternally threaded flange; confirm mating thread and dimensions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003ch2\u003eWhat's Included\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eEach flange choice: one selected metal flange coupling, two fixing set screws and one hex key.\u003c\/li\u003e\n\u003cli\u003eM 3 Set Screws + Hex Key: separate M 3 screw accessory and matching key; flange not included.\u003c\/li\u003e\n\u003cli\u003eM 4 Set Screws + Hex Key: separate M 4 screw accessory and matching key; flange not included.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThe exact screw quantity in the separately sold accessory options is not specified. The two supplied set screws and one key are explicitly identified for the flange packages. Photos showing multiple flanges illustrate alternative sizes and views, not a multi-flange bundle.\u003c\/p\u003e\u003ch2\u003eInstallation and Compatibility\u003c\/h2\u003e\u003cp\u003eMatch the bore to the actual shaft and align the flange face with the attached surface. Tighten the opposing set screws evenly and use suitable face-mounting fasteners for the four holes. Confirm clearance, concentricity and screw engagement before operation. A rigid coupling does not provide flexible misalignment compensation. Threaded-bore variants require a matching threaded part; do not force them onto a smooth shaft.\u003c\/p\u003e\u003cp\u003eExample motor assemblies demonstrate how a flange can attach to a small DC gear motor. Motors, gearboxes, drives and complete mechanisms are not included. Select dimensions by the actual shaft and mounting pattern rather than the appearance of a demonstration motor. No torque, speed or precision rating is specified.\u003c\/p\u003e\u003ch2\u003eApplications\u003c\/h2\u003e\u003cp\u003eCompact robot mechanisms, shaft-to-disc connections, small motor-driven fixtures and mechanical prototypes requiring a rigid flanged attachment.\u003c\/p\u003e\u003ch2\u003eFAQ\u003c\/h2\u003e\u003ch3\u003eDoes the M 3 screw option include a flange?\u003c\/h3\u003e\u003cp\u003eNo. It is a separate set-screw and hex-key accessory.\u003c\/p\u003e\u003ch3\u003eIs a threaded bore the same as a 3 mm or 4 mm smooth bore?\u003c\/h3\u003e\u003cp\u003eNo. M 3, M 4 andM 6 specify internally threaded alternatives. Match the mating thread separately.\u003c\/p\u003e\u003ch3\u003eIs the motor shown in the installation example included?\u003c\/h3\u003e\u003cp\u003eNo. The motor is shown only to demonstrate mounting.\u003c\/p\u003e\u003ch2\u003eVisual Details\u003c\/h2\u003e\u003cfigure\u003e\u003ca href=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/local68-132-drawing8.webp?v=1792807024\" target=\"_blank\" rel=\"noopener\"\u003e\u003cimg src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/local68-132-drawing8.webp?v=1792807024\" alt=\"Original 8mm flange geometry - see complete English dimensions\" style=\"max-width:100%;height:auto\" loading=\"lazy\"\u003e\u003c\/a\u003e\u003cfigcaption\u003eOriginal 8mm flange geometry - see complete English dimensions\u003c\/figcaption\u003e\u003c\/figure\u003e\u003cfigure\u003e\u003ca href=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/local68-132-drawing3to6.webp?v=1792807028\" target=\"_blank\" rel=\"noopener\"\u003e\u003cimg src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/local68-132-drawing3to6.webp?v=1792807028\" alt=\"Original 3–6mm flange geometry - see complete English dimensions\" style=\"max-width:100%;height:auto\" loading=\"lazy\"\u003e\u003c\/a\u003e\u003cfigcaption\u003eOriginal 3–6mm flange geometry - see complete English dimensions\u003c\/figcaption\u003e\u003c\/figure\u003e\u003cfigure\u003e\u003ca href=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/local68-132-dimensions.webp?v=1792807032\" target=\"_blank\" rel=\"noopener\"\u003e\u003cimg src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/local68-132-dimensions.webp?v=1792807032\" alt=\"Flange coupling dimensions\" style=\"max-width:100%;height:auto\" loading=\"lazy\"\u003e\u003c\/a\u003e\u003cfigcaption\u003eFlange coupling dimensions\u003c\/figcaption\u003e\u003c\/figure\u003e\u003cfigure\u003e\u003ca href=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/local68-132-selection.webp?v=1792807036\" target=\"_blank\" rel=\"noopener\"\u003e\u003cimg src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/local68-132-selection.webp?v=1792807036\" alt=\"Flange and accessory contents\" style=\"max-width:100%;height:auto\" loading=\"lazy\"\u003e\u003c\/a\u003e\u003cfigcaption\u003eFlange and accessory contents\u003c\/figcaption\u003e\u003c\/figure\u003e","brand":"CHIHAI MOTOR","offers":[{"title":"3mm Smooth Bore Flange","offer_id":68123454832864,"sku":"FLANGE-68132-001","price":9.31,"currency_code":"USD","in_stock":true},{"title":"4mm Smooth Bore Flange","offer_id":68123454865632,"sku":"FLANGE-68132-002","price":9.31,"currency_code":"USD","in_stock":true},{"title":"5mm Smooth Bore Flange","offer_id":68123454898400,"sku":"FLANGE-68132-003","price":9.31,"currency_code":"USD","in_stock":true},{"title":"6mm Smooth Bore Flange","offer_id":68123454931168,"sku":"FLANGE-68132-004","price":9.31,"currency_code":"USD","in_stock":true},{"title":"8mm Smooth Bore Flange","offer_id":68123454963936,"sku":"FLANGE-68132-005","price":10.23,"currency_code":"USD","in_stock":true},{"title":"M3 Set Screws + Hex Key","offer_id":68123454996704,"sku":"FLANGE-68132-006","price":7.92,"currency_code":"USD","in_stock":true},{"title":"M4 Set Screws + Hex Key","offer_id":68123455029472,"sku":"FLANGE-68132-007","price":7.92,"currency_code":"USD","in_stock":true},{"title":"M3 Threaded-Bore Flange","offer_id":68123455062240,"sku":"FLANGE-68132-008","price":9.77,"currency_code":"USD","in_stock":true},{"title":"M4 Threaded-Bore Flange","offer_id":68123455095008,"sku":"FLANGE-68132-009","price":9.77,"currency_code":"USD","in_stock":true},{"title":"M6 Threaded-Bore Flange","offer_id":68123455127776,"sku":"FLANGE-68132-010","price":9.77,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0643\/3210\/3904\/files\/local68-132-g1.jpg?v=1792807040","url":"https:\/\/rcdrone.top\/ms\/products\/rigid-metal-flange-shaft-coupling-3-8mm-threaded-options","provider":"RCDrone","version":"1.0","type":"link"}