{"product_id":"12a-sprocket-wheel-10-26t-roller-chain-sprockets-pitch-19-05mm-45-a3-steel","title":"12A Sprocket Wheel 10~26T Roller Chain Sprockets Pitch 19.05mm 45#-A3# Steel","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e12A Roller Chain Sprockets — Precision-Machined 10–26T for #40 Chain Drives\u003c\/h2\u003e\n\u003cp\u003eWhen a worn or undersized sprocket causes chain skip, uneven wear, or unexpected downtime, finding an exact-spec replacement matters. Engineers, maintenance technicians, and serious DIY builders working with 12A (#40) roller chain drives need sprockets machined to tight tolerances — not generic castings that introduce slop into the drivetrain.\u003c\/p\u003e\n\u003cp\u003eThese 12A roller chain sprockets are machined from 45# carbon steel (equivalent to AISI 1045) with an A3 structural steel option on select variants. The chain pitch is 19.05 mm (¾ inch), matching the ISO 12A \/ ANSI #40 standard. Tooth counts range from 10T to 26T, with outer diameters scaling accordingly from approximately 62 mm (2.44 in) at 10T to approximately 160 mm (6.30 in) at 26T. Available configurations include Flat Sprocket, Cam Sprocket, A-Double Strand Sprocket, and B-Double Strand Sprocket.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include conveyor drive systems requiring a 12A sprocket replacement, agricultural and industrial gearbox output shafts running #40 chain, and custom power-transmission builds where a specific tooth count is needed to achieve a target gear ratio. The double-strand variants suit applications demanding higher load capacity on the same shaft centerline.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔗\u003c\/span\u003e \u003cstrong\u003eCompatible with:\u003c\/strong\u003e ISO 12A \/ ANSI #40 roller chain — pitch 19.05 mm (¾ in) — single and double strand\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 12A Roller Chain Sprockets\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003eISO 12A \/ ANSI #40 Standard Pitch\u003c\/strong\u003e\u003cbr\u003e19.05 mm pitch matches the global #40 chain standard, ensuring drop-in compatibility with existing chain drives without re-spacing.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003e45# Carbon Steel Construction\u003c\/strong\u003e\u003cbr\u003eMachined from 45# carbon steel (AISI 1045 equivalent) for a balance of hardness and machinability — resists tooth deformation under sustained load.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eWide Tooth-Count Range: 10T – 26T\u003c\/strong\u003e\u003cbr\u003eSeventeen tooth-count options let you dial in the exact gear ratio your drive requires without custom fabrication.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eFour Sprocket Configurations\u003c\/strong\u003e\u003cbr\u003eChoose from Flat, Cam, A-Double Strand, or B-Double Strand to match your shaft interface and load requirements.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e \u003cstrong\u003eCorrosion-Resistant Finish\u003c\/strong\u003e\u003cbr\u003eSurface treatment reduces oxidation in moderately humid environments, extending service life between maintenance intervals.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e \u003cstrong\u003ePrecision-Hobbed Tooth Profile\u003c\/strong\u003e\u003cbr\u003eHobbed tooth geometry ensures smooth chain engagement and even load distribution across all teeth, reducing chain elongation over time.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — 12A Roller Chain Sprocket\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eChain Standard\u003c\/th\u003e\n\u003ctd\u003eISO 12A \/ ANSI #40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eChain Pitch\u003c\/th\u003e\n\u003ctd\u003e19.05 mm (¾ in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count (T)\u003c\/th\u003e\n\u003ctd\u003e10T, 11T, 12T, 13T, 14T, 15T, 16T, 17T, 18T, 19T, 20T, 21T, 22T, 23T, 24T, 25T, 26T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSprocket Type\u003c\/th\u003e\n\u003ctd\u003eFlat Sprocket \/ Cam Sprocket \/ A-Double Strand \/ B-Double Strand\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e45# Carbon Steel (AISI 1045 equivalent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Diameter \/ Bore\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Length\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Treatment\u003c\/th\u003e\n\u003ctd\u003eOxidation-resistant finish\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\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\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I know which tooth count to choose?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYour gear ratio equals the driven sprocket tooth count divided by the drive sprocket tooth count. For example, pairing a 13T drive sprocket with a 26T driven sprocket gives a 2:1 reduction. Count the teeth on your existing sprocket or measure the pitch circle diameter and use a sprocket calculator to confirm the tooth count before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this sprocket compatible with ANSI #40 roller chain?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. ISO 12A and ANSI #40 share the same 19.05 mm (¾ in) pitch, so these sprockets are fully interchangeable with standard #40 roller chain from any manufacturer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the Flat, Cam, A-Double Strand, and B-Double Strand types?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe Flat Sprocket is a standard single-strand sprocket with a flat hub face. The Cam Sprocket features a cam-style hub for specific shaft-locking applications. A-Double Strand and B-Double Strand sprockets accept two parallel strands of #40 chain simultaneously, roughly doubling the load capacity compared to a single-strand sprocket — the A and B designations refer to different hub geometries for different shaft configurations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are these sprockets under continuous load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e45# carbon steel (AISI 1045) has a typical tensile strength of approximately 600–700 MPa and yield strength around 355 MPa. For exact load ratings, cross-reference the ANSI #40 chain breaking load (typically 17.8 kN for single strand) with your application's safety factor. Double-strand variants can handle proportionally higher loads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill these sprockets rust in outdoor or humid environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe surface treatment provides moderate corrosion resistance suitable for indoor industrial and sheltered outdoor use. For continuously wet or chemically aggressive environments, apply a chain lubricant regularly and consider stainless steel alternatives if long-term exposure is expected.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I measure my existing sprocket to confirm compatibility?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure three things: (1) chain pitch — the center-to-center distance between two adjacent roller pins, which should be 19.05 mm; (2) tooth count — count all teeth around the sprocket; (3) bore diameter — measure the shaft hole diameter to ensure the replacement sprocket's bore matches your shaft. Contact us with these measurements if you need confirmation before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use a double-strand sprocket with a single-strand chain?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo. Double-strand sprockets are machined with two side-by-side tooth rows and require double-strand #40 chain. Using a single-strand chain on a double-strand sprocket will result in misalignment and accelerated wear. Select the Flat or Cam Sprocket type for single-strand chain applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Products Type and tooth count (Model) above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"Flat Sprocket \/ 12A 10T","offer_id":52423243268370,"sku":"GLFBDMHGLBZSJ073236x1","price":24.32,"currency_code":"USD","in_stock":true},{"title":"Flat Sprocket \/ 12A 11T","offer_id":52423243301138,"sku":"GLFBDMHGLBZSJ073237x1","price":29.34,"currency_code":"USD","in_stock":true},{"title":"Flat Sprocket \/ 12A 12T","offer_id":52423243333906,"sku":"GLFBDMHGLBZSJ073238x1","price":34.5,"currency_code":"USD","in_stock":true},{"title":"Flat Sprocket \/ 12A 13T","offer_id":52423243366674,"sku":"GLFBDMHGLBZSJ073239x1","price":36.96,"currency_code":"USD","in_stock":true},{"title":"Flat Sprocket \/ 12A 14T","offer_id":52423243399442,"sku":"GLFBDMHGLBZSJ073240x1","price":46.88,"currency_code":"USD","in_stock":true},{"title":"Flat Sprocket \/ 12A 15T","offer_id":52423243432210,"sku":"GLFBDMHGLBZSJ073241x1","price":60.83,"currency_code":"USD","in_stock":true},{"title":"Flat Sprocket \/ 12A 16T","offer_id":52423243464978,"sku":"GLFBDMHGLBZSJ073242x1","price":65.96,"currency_code":"USD","in_stock":true},{"title":"Flat Sprocket \/ 12A 17T","offer_id":52423243497746,"sku":"GLFBDMHGLBZSJ073243x1","price":77.45,"currency_code":"USD","in_stock":true},{"title":"Flat Sprocket \/ 12A 18T","offer_id":52423243530514,"sku":"GLFBDMHGLBZSJ073244x1","price":98.08,"currency_code":"USD","in_stock":true},{"title":"Flat Sprocket \/ 12A 19T","offer_id":52423243563282,"sku":"GLFBDMHGLBZSJ073245x1","price":109.85,"currency_code":"USD","in_stock":true},{"title":"Flat Sprocket \/ 12A 20T","offer_id":52423243596050,"sku":"GLFBDMHGLBZSJ073246x1","price":121.61,"currency_code":"USD","in_stock":true},{"title":"Flat Sprocket \/ 12A 21T","offer_id":52423243628818,"sku":"GLFBDMHGLBZSJ073247x1","price":133.44,"currency_code":"USD","in_stock":true},{"title":"Flat Sprocket \/ 12A 22T","offer_id":52423243661586,"sku":"GLFBDMHGLBZSJ073248x1","price":154.43,"currency_code":"USD","in_stock":true},{"title":"Flat Sprocket \/ 12A 23T","offer_id":52423243694354,"sku":"GLFBDMHGLBZSJ073249x1","price":168.54,"currency_code":"USD","in_stock":true},{"title":"Flat Sprocket \/ 12A 24T","offer_id":52423243727122,"sku":"GLFBDMHGLBZSJ073250x1","price":180.53,"currency_code":"USD","in_stock":true},{"title":"Flat Sprocket \/ 12A 25T","offer_id":52423243759890,"sku":"GLFBDMHGLBZSJ073251x1","price":195.4,"currency_code":"USD","in_stock":true},{"title":"Flat Sprocket \/ 12A 26T","offer_id":52423243792658,"sku":"GLFBDMHGLBZSJ073252x1","price":210.77,"currency_code":"USD","in_stock":true},{"title":"Cam Sprocket \/ 12A 10T","offer_id":52423243825426,"sku":"GLFBDMHGLBZSJ073277x1","price":56.62,"currency_code":"USD","in_stock":true},{"title":"Cam Sprocket \/ 12A 11T","offer_id":52423243858194,"sku":"GLFBDMHGLBZSJ073278x1","price":62.83,"currency_code":"USD","in_stock":true},{"title":"Cam Sprocket \/ 12A 12T","offer_id":52423243890962,"sku":"GLFBDMHGLBZSJ073279x1","price":69.09,"currency_code":"USD","in_stock":true},{"title":"Cam Sprocket \/ 12A 13T","offer_id":52423243923730,"sku":"GLFBDMHGLBZSJ073280x1","price":83.06,"currency_code":"USD","in_stock":true},{"title":"Cam Sprocket \/ 12A 14T","offer_id":52423243956498,"sku":"GLFBDMHGLBZSJ073281x1","price":91.5,"currency_code":"USD","in_stock":true},{"title":"Cam Sprocket \/ 12A 15T","offer_id":52423243989266,"sku":"GLFBDMHGLBZSJ073282x1","price":102.15,"currency_code":"USD","in_stock":true},{"title":"Cam Sprocket \/ 12A 16T","offer_id":52423244022034,"sku":"GLFBDMHGLBZSJ073283x1","price":110.96,"currency_code":"USD","in_stock":true},{"title":"Cam Sprocket \/ 12A 17T","offer_id":52423244054802,"sku":"GLFBDMHGLBZSJ073284x1","price":129.38,"currency_code":"USD","in_stock":true},{"title":"Cam Sprocket \/ 12A 18T","offer_id":52423244087570,"sku":"GLFBDMHGLBZSJ073285x1","price":142.58,"currency_code":"USD","in_stock":true},{"title":"Cam Sprocket \/ 12A 19T","offer_id":52423244120338,"sku":"GLFBDMHGLBZSJ073286x1","price":157.69,"currency_code":"USD","in_stock":true},{"title":"Cam Sprocket \/ 12A 20T","offer_id":52423244153106,"sku":"GLFBDMHGLBZSJ073287x1","price":170.12,"currency_code":"USD","in_stock":true},{"title":"Cam Sprocket \/ 12A 21T","offer_id":52423244185874,"sku":"GLFBDMHGLBZSJ073288x1","price":188.84,"currency_code":"USD","in_stock":true},{"title":"Cam Sprocket \/ 12A 22T","offer_id":52423244218642,"sku":"GLFBDMHGLBZSJ073289x1","price":194.72,"currency_code":"USD","in_stock":true},{"title":"Cam Sprocket \/ 12A 23T","offer_id":52423244251410,"sku":"GLFBDMHGLBZSJ073290x1","price":217.57,"currency_code":"USD","in_stock":true},{"title":"A-Double Strand Sprocket \/ 12A 12T","offer_id":52423244284178,"sku":"GLFBDMHGLBZSJ073331x1","price":126.77,"currency_code":"USD","in_stock":true},{"title":"A-Double Strand Sprocket \/ 12A 13T","offer_id":52423244316946,"sku":"GLFBDMHGLBZSJ073332x1","price":142.27,"currency_code":"USD","in_stock":true},{"title":"A-Double Strand Sprocket \/ 12A 14T","offer_id":52423244349714,"sku":"GLFBDMHGLBZSJ073333x1","price":172.23,"currency_code":"USD","in_stock":true},{"title":"A-Double Strand Sprocket \/ 12A 15T","offer_id":52423244382482,"sku":"GLFBDMHGLBZSJ073334x1","price":202.26,"currency_code":"USD","in_stock":true},{"title":"B-Double Strand Sprocket \/ 12A 12T","offer_id":52423244415250,"sku":"GLFBDMHGLBZSJ073351x1","price":106.03,"currency_code":"USD","in_stock":true},{"title":"B-Double Strand Sprocket \/ 12A 13T","offer_id":52423244448018,"sku":"GLFBDMHGLBZSJ073352x1","price":119.58,"currency_code":"USD","in_stock":true},{"title":"B-Double Strand Sprocket \/ 12A 14T","offer_id":52423244480786,"sku":"GLFBDMHGLBZSJ073353x1","price":142.84,"currency_code":"USD","in_stock":true},{"title":"B-Double Strand Sprocket \/ 12A 15T","offer_id":52423244513554,"sku":"GLFBDMHGLBZSJ073354x1","price":162.44,"currency_code":"USD","in_stock":true},{"title":"B-Double Strand Sprocket \/ 12A 16T","offer_id":52423244546322,"sku":"GLFBDMHGLBZSJ073355x1","price":174.19,"currency_code":"USD","in_stock":true},{"title":"B-Double Strand Sprocket \/ 12A 17T","offer_id":52423244579090,"sku":"GLFBDMHGLBZSJ073356x1","price":200.16,"currency_code":"USD","in_stock":true},{"title":"B-Double Strand Sprocket \/ 12A 18T","offer_id":52423244611858,"sku":"GLFBDMHGLBZSJ073357x1","price":217.94,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-06_bfc0432e-ed30-4e64-81e5-99fd43dcadf7.jpg?v=1782653895","url":"https:\/\/homediyer.com\/products\/12a-sprocket-wheel-10-26t-roller-chain-sprockets-pitch-19-05mm-45-a3-steel","provider":"HomeDIYer","version":"1.0","type":"link"}