{"id":827,"date":"2026-10-11T01:46:29","date_gmt":"2026-10-11T01:46:29","guid":{"rendered":"https:\/\/aft-forge.jk-ideaweb.com\/?post_type=product&#038;p=827"},"modified":"2026-10-19T11:43:34","modified_gmt":"2026-10-19T11:43:34","slug":"crank","status":"publish","type":"product","link":"https:\/\/aft-forge.com\/en\/product\/crank\/","title":{"rendered":"Crank"},"content":{"rendered":"<div id=\"prodNav\">\n<div class=\"tab-content responsive\" style=\"text-align: left;\">\n<div id=\"contentprod0\" class=\"tab-pane active txtNormal\">\n<h2>Forged Aluminum Bicycle Right Crank: 6061-F Crank with Integrated Spider<\/h2>\n<p>The forged aluminum bicycle right crank is the drive-side crank arm of a crankset, with a five-arm chainring spider integrated at the axle end and forged in one piece with the arm, and the pedal mounted at the other end. It is made of 6061-F aluminum with a published weight of 0.29 kg. The one-piece design removes the interface between spider and crank, increasing stiffness.<\/p>\n<p>The right crank must transmit pedaling torque to the chainrings while carrying bending loads, and the central hub where the arms meet is the most complex and highly stressed area. Al Forge Tech (AFT) closed-die hot forges the crank so grain flow runs continuously from the crank arm into all five spider arms. After heat treatment, the axle hole, pedal hole and chainring bolt holes are CNC-machined, with BCD and center distance verified on CMM.<\/p>\n<h3>Key Features<\/h3>\n<ul>\n<li>Crank arm and five-arm spider forged in one piece<\/li>\n<li>6061-F aluminum, 0.29 kg (published specification)<\/li>\n<li>No spider interface, for higher stiffness<\/li>\n<li>BCD, center distance and hole positions measured on CMM<\/li>\n<\/ul>\n<h2>Forged Aluminum Bicycle Right Crank Specifications and Manufacturing Capability<\/h2>\n<div class=\"table-container\">\n<table class=\"table table-bordered table-striped\">\n<thead>\n<tr>\n<th>Item<\/th>\n<th>Details<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Product category<\/td>\n<td>Aluminum Forging Bicycle Parts<\/td>\n<\/tr>\n<tr>\n<td>Application<\/td>\n<td>Bicycle and e-bike cranksets (right\/drive side)<\/td>\n<\/tr>\n<tr>\n<td>Primary process<\/td>\n<td>Closed-die hot forging (hot forging presses 600T\u20138,000T)<\/td>\n<\/tr>\n<tr>\n<td>Material<\/td>\n<td>6061-F aluminum alloy<\/td>\n<\/tr>\n<tr>\n<td>Heat treatment<\/td>\n<td>Per customer specification (published specification: 6061-F)<\/td>\n<\/tr>\n<tr>\n<td>Secondary machining<\/td>\n<td>CNC machining (52 machining centers, 30 lathes), deburring, vibratory finishing<\/td>\n<\/tr>\n<tr>\n<td>Surface finish<\/td>\n<td>Anodizing (including hard anodizing), shot blasting, e-coating or painting, as required<\/td>\n<\/tr>\n<tr>\n<td>Inspection<\/td>\n<td>Zeiss CMM (4 units), hardness testers, spectrometer, fluorescent penetrant inspection line<\/td>\n<\/tr>\n<tr>\n<td>Weight<\/td>\n<td>0.29 kg<\/td>\n<\/tr>\n<tr>\n<td>Dimensions and tolerances<\/td>\n<td>Per customer 2D\/3D drawings<\/td>\n<\/tr>\n<tr>\n<td>Quality system<\/td>\n<td>IATF 16949:2016, ISO 14001:2015<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2>Forged Aluminum Bicycle Right Crank Manufacturing Process<\/h2>\n<ol>\n<li><strong>Drawing review and DFM<\/strong>: we confirm alloy, load direction and critical dimensions, then run QForm simulation to predict metal flow and defect risk.<\/li>\n<li><strong>Die design and manufacturing<\/strong>: the number of die sets (for example, blocker and finisher dies) is planned around part complexity, and die contours are checked with a portable 3D scanner.<\/li>\n<li><strong><a href=\"https:\/\/aft-forge.com\/forging-service\/hot-forging-service\/\">Hot forging<\/a><\/strong>: closed-die forming on 600T\u20138,000T hot forging presses creates a continuous grain flow that follows the part contour.<\/li>\n<li><strong>Heat treatment<\/strong>: T4 solution treatment and T6 artificial aging are performed in-house, with parameters set by alloy and strength requirement.<\/li>\n<li><strong><a href=\"https:\/\/aft-forge.com\/forging-service\/aluminum-cnc-machining-services\/\">CNC machining<\/a> and finishing<\/strong>: holes, threads and mating surfaces are machined, followed by deburring, vibratory finishing, shot blasting or anodizing as required.<\/li>\n<li><strong>Inspection and shipment<\/strong>: dimensions, hardness and chemical composition are verified with CMM, hardness testers and a spectrometer, with lot traceability kept under IATF 16949.<\/li>\n<\/ol>\n<h2>FAQ<\/h2>\n<h3>How does an integrated right crank differ from one with a separate spider?<\/h3>\n<p>A separate-spider design bolts or splines the spider to the crank, allowing different spider specifications but adding an interface. An integrated right crank forms spider and arm from one forging with no interface, giving higher stiffness and fewer parts, but the chainring specification must be fixed at the design stage. AFT can develop either structure to the brand&#8217;s drawing.<\/p>\n<h3>How is complete fill ensured on a multi-branch forging like a right crank?<\/h3>\n<p>The central hub joins the crank arm and five spider arms, so material must split six ways during forging, and poor distribution leaves underfill at the arm tips. AFT plans billet shape and preforms with QForm simulation, forms the part progressively with blocker and finisher dies, and confirms the shape through first-, middle- and last-piece checks.<\/p>\n<h3>Is heat treatment for the Forged Aluminum Bicycle Right Crank done in-house?<\/h3>\n<p>Yes. Al Forge Tech operates 8 T4 solution treatment units and 7 T6 artificial aging units on site, so the Forged Aluminum Bicycle Right Crank can be solution treated, quenched and aged in the same facility before machining and inspection. Keeping heat treatment in-house removes inter-plant transport, reduces lead-time risk and keeps lot traceability within one quality system. Parameters are set according to the alloy grade and your specification.<\/p>\n<h3>Can you assess forging feasibility while the Forged Aluminum Bicycle Right Crank is still in design?<\/h3>\n<p>Yes. Al Forge Tech works mainly as an OEM supplier, and our engineers can give design-for-manufacturability (DFM) feedback at the concept or drawing stage, such as adjusting thin ribs, abrupt section changes or draft angles to avoid laps and underfill. QForm simulation predicts metal flow early, and the results are cross-checked against our die design experience.<\/p>\n<h3>How do you keep the Forged Aluminum Bicycle Right Crank consistent from lot to lot?<\/h3>\n<p>Al Forge Tech runs incoming (IQC), in-process (IPQC) and final (FQC) inspection under IATF 16949:2016, supported by 4 Zeiss CMMs, hardness testers, a spectrometer and a fluorescent penetrant inspection line. First, middle and last pieces of every lot are checked against the die; when wear causes dimensional drift, the die is reworked to keep the Forged Aluminum Bicycle Right Crank stable across lots.<\/p>\n<h2>Request a Quote for the Forged Aluminum Bicycle Right Crank<\/h2>\n<p>Developing a new Forged Aluminum Bicycle Right Crank or converting an existing part to aluminum forging? Send us your 3D\/2D drawings, alloy and temper, annual volume and finishing requirements. Our engineering team will reply with a feasibility review, die plan and quotation.<\/p>\n<ul>\n<li>Online inquiry: <a href=\"https:\/\/aft-forge.com\/contact-us\/\">Contact Us<\/a><\/li>\n<li>Email: <a href=\"mailto:aft@aft-forge.com.tw\">aft@aft-forge.com.tw<\/a><\/li>\n<\/ul>\n<p>To compare similar parts, browse <a href=\"https:\/\/aft-forge.com\/bicycle-parts-bike-parts\/\">Aluminum Forging Bicycle Parts<\/a>\u00a0and our <a href=\"https:\/\/aft-forge.com\/category\/applications\/\">automotive aluminum forging applications<\/a>, or visit <a href=\"https:\/\/aft-forge.com\/about-us\/\">About Us<\/a> for our equipment and certifications.<\/p>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Forged Aluminum Bicycle Right Crank: 6061-F Crank with Integrated Spider The forged aluminum bicycle right crank is the drive-side crank arm of a crankset, with a five-arm chainring spider integrated at the axle end and forged in one piece with the arm, and the pedal mounted at the other end. It is made of 6061-F [&hellip;]<\/p>\n","protected":false},"featured_media":828,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[],"product_cat":[24],"product_tag":[],"class_list":["post-827","product","type-product","status-publish","has-post-thumbnail","product_cat-bicycle-parts-bike-parts","first","instock","taxable","shipping-taxable","product-type-simple"],"acf":[],"_links":{"self":[{"href":"https:\/\/aft-forge.com\/en\/wp-json\/wp\/v2\/product\/827","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aft-forge.com\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/aft-forge.com\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/aft-forge.com\/en\/wp-json\/wp\/v2\/comments?post=827"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/aft-forge.com\/en\/wp-json\/wp\/v2\/media\/828"}],"wp:attachment":[{"href":"https:\/\/aft-forge.com\/en\/wp-json\/wp\/v2\/media?parent=827"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/aft-forge.com\/en\/wp-json\/wp\/v2\/product_brand?post=827"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/aft-forge.com\/en\/wp-json\/wp\/v2\/product_cat?post=827"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/aft-forge.com\/en\/wp-json\/wp\/v2\/product_tag?post=827"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}