{"product_id":"simplex-sprocket-wheel-25-04c-roller-chain-9-40t-pitch-1-4-bore-6-20mm","title":"Simplex Sprocket Wheel for #25 (04C) Roller Chain, 9-40T, Pitch 1\/4\" Bore 6-20mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eSimplex Sprocket Wheel for #25 (04C) Roller Chain — Precision Chain Drive for Makers \u0026amp; Builders\u003c\/h2\u003e\n    \u003cp\u003eWhen your drivetrain slips, skips, or simply won't fit the shaft you have on hand, the problem is almost always a mismatched sprocket. Hobbyists, robotics builders, and light-industrial equipment designers who rely on #25 (04C) roller chain need a sprocket that locks onto the shaft cleanly, meshes with the chain without play, and holds up through thousands of cycles without loosening. This simplex sprocket wheel is engineered specifically for that job.\u003c\/p\u003e\n    \u003cp\u003eEach sprocket is machined from carbon steel and finished to close tolerances for the #25 (04C) roller chain standard — pitch 1\/4 inch (6.35 mm). The range covers 9 to 40 teeth and bore sizes from 5 mm to 20 mm (approximately 0.20\" to 0.79\"), with four hub configurations: K-type plain bore, BF-type plain bore, keyway bore (with standard DIN keyway slots), and D-bore (flat-sided shaft engagement). Matching #25 roller chain in 0.5 m and 5 m lengths is also available as a bundle option.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include small conveyor drives and indexing tables where a #25 chain sprocket replacement is needed, DIY go-kart and mini-bike chain drive builds requiring a compact 1\/4-inch pitch sprocket, and robotics or automation rigs that need a keyed or D-bore sprocket for positive shaft engagement without set-screw slip.\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 Chain:\u003c\/strong\u003e #25 \/ 04C-1 Simplex Roller Chain — Pitch 1\/4 inch (6.35 mm)  |  \u003cstrong\u003eTooth Range:\u003c\/strong\u003e 9T – 40T  |  \u003cstrong\u003eBore Range:\u003c\/strong\u003e 5 mm – 20 mm (plain, keyway, D-bore)\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These #25 (04C) Simplex Sprocket Wheels\u003c\/h2\u003e\n    \u003cul class=\"hdiy-list\"\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cstrong\u003eFour Hub Styles in One Listing\u003c\/strong\u003e — Choose K-type plain bore, BF-type plain bore, keyway bore (DIN slot), or D-bore to match your shaft engagement method exactly.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eWide Tooth \u0026amp; Bore Matrix\u003c\/strong\u003e — 9T through 40T tooth counts paired with bore sizes from 5 mm to 20 mm give you the gear ratio and shaft fit you need without custom machining.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eKeyway Variants with Defined Slot Dimensions\u003c\/strong\u003e — Keyway bore options list the exact slot size (e.g., 3×1.4 mm, 4×1.8 mm, 5×2.3 mm, 6×2.8 mm) so you can match your existing key stock without guessing.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e\u003cstrong\u003eCarbon Steel Construction\u003c\/strong\u003e — Machined carbon steel body provides the rigidity and wear resistance needed for continuous-duty chain drive applications in light machinery and DIY builds.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003eStandard #25 \/ 04C Chain Pitch\u003c\/strong\u003e — 1\/4 inch (6.35 mm) pitch conforms to the ANSI #25 \/ ISO 04C-1 roller chain standard, ensuring drop-in compatibility with off-the-shelf chain.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔗\u003c\/span\u003e\u003cstrong\u003eMatching Chain Available\u003c\/strong\u003e — Bundle with #25 (04C-1) roller chain in 0.5 m or 5 m lengths to complete your drive assembly in a single order.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — #25 (04C) Simplex Sprocket Wheel\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eChain Standard\u003c\/th\u003e\n\u003ctd\u003e#25 \/ ANSI 25 \/ ISO 04C-1 Simplex Roller Chain\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eChain Pitch\u003c\/th\u003e\n\u003ctd\u003e1\/4 inch (6.35 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e9T – 40T (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Size Range\u003c\/th\u003e\n\u003ctd\u003e5 mm – 20 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHub \/ Bore Type\u003c\/th\u003e\n\u003ctd\u003eK-type plain bore \/ BF-type plain bore \/ Keyway bore \/ D-bore (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eKeyway Slot Sizes\u003c\/th\u003e\n\u003ctd\u003e3×1.4 mm, 4×1.8 mm, 5×2.3 mm, 6×2.8 mm (keyway variants only)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSimplex \/ Duplex\u003c\/th\u003e\n\u003ctd\u003eSimplex (single-strand)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Chain Length Options\u003c\/th\u003e\n\u003ctd\u003e0.5 m \/ 5 m (sold separately as bundle variant)\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\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 the right number of teeth for my application?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe tooth count determines your drive ratio. Divide the driven sprocket teeth by the driver sprocket teeth to get the reduction ratio. For example, a 9T driver paired with a 40T driven sprocket gives roughly a 4.4:1 reduction. Use a smaller tooth count on the motor side for more torque, or a larger count for higher output speed. If you are replacing an existing sprocket, match the tooth count exactly.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat bore size should I order?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your shaft diameter with a caliper. Select the bore size that matches your shaft — the bore should be a close sliding fit, not loose. For keyway variants, also confirm your key stock dimensions match one of the listed slot sizes (3×1.4 mm, 4×1.8 mm, 5×2.3 mm, or 6×2.8 mm). For D-bore variants, measure both the shaft diameter and the flat-to-round dimension.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between K-type and BF-type hubs?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBoth K-type and BF-type are plain bore (no keyway, no flat). The difference is in hub geometry: K-type typically has a shorter, narrower hub profile suited to compact assemblies, while BF-type has a wider flange face that provides more bearing surface against the chain plate. Check your available shaft engagement length and side clearance before choosing.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill this sprocket work with any #25 roller chain?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. These sprockets are machined to the ANSI #25 \/ ISO 04C-1 standard with a 6.35 mm (1\/4 inch) pitch. They are compatible with any simplex #25 or 04C-1 roller chain from any manufacturer that conforms to that standard. The matching chain variants listed in this product (0.5 m and 5 m) are also #25 (04C-1) and will mesh correctly.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong are these sprockets for continuous-duty use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe carbon steel construction provides solid rigidity for light-to-medium duty continuous operation typical of conveyors, go-karts, mini-bikes, and robotics platforms. For heavy shock-load or high-speed industrial applications beyond the #25 chain's rated working load, consider upgrading to a larger chain pitch series. Always ensure your chain tension and lubrication are within the chain manufacturer's recommendations.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these sprockets corrosion resistant?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eCarbon steel sprockets are not inherently corrosion resistant. For indoor or dry environments, standard carbon steel performs well with periodic lubrication. For damp, outdoor, or washdown environments, apply a chain lubricant or anti-rust coating, or consider stainless steel alternatives if your application demands it.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these sprockets with a duplex (double-strand) chain?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eNo. These are simplex (single-strand) sprockets designed for single-strand #25 \/ 04C-1 roller chain only. Using them with duplex chain will result in misalignment and accelerated wear. If you need duplex chain compatibility, you will need a duplex-rated sprocket with the correct plate spacing.\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 hub type, tooth count, and bore 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 number of teeth for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The tooth count determines your drive ratio. Divide the driven sprocket teeth by the driver sprocket teeth to get the reduction ratio. For example, a 9T driver paired with a 40T driven sprocket gives roughly a 4.4:1 reduction. Use a smaller tooth count on the motor side for more torque, or a larger count for higher output speed. If you are replacing an existing sprocket, match the tooth count exactly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What bore size should I order?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your shaft diameter with a caliper. Select the bore size that matches your shaft. For keyway variants, confirm your key stock dimensions match one of the listed slot sizes (3x1.4 mm, 4x1.8 mm, 5x2.3 mm, or 6x2.8 mm). For D-bore variants, measure both the shaft diameter and the flat-to-round dimension.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between K-type and BF-type hubs?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Both K-type and BF-type are plain bore (no keyway, no flat). K-type typically has a shorter, narrower hub profile suited to compact assemblies, while BF-type has a wider flange face that provides more bearing surface against the chain plate.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this sprocket work with any #25 roller chain?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. These sprockets are machined to the ANSI #25 \/ ISO 04C-1 standard with a 6.35 mm (1\/4 inch) pitch. They are compatible with any simplex #25 or 04C-1 roller chain from any manufacturer that conforms to that standard.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are these sprockets for continuous-duty use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The carbon steel construction provides solid rigidity for light-to-medium duty continuous operation typical of conveyors, go-karts, mini-bikes, and robotics platforms. Always ensure your chain tension and lubrication are within the chain manufacturer's recommendations.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these sprockets corrosion resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Carbon steel sprockets are not inherently corrosion resistant. For indoor or dry environments, standard carbon steel performs well with periodic lubrication. For damp or outdoor environments, apply a chain lubricant or anti-rust coating.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these sprockets with a duplex (double-strand) chain?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No. These are simplex (single-strand) sprockets designed for single-strand #25 \/ 04C-1 roller chain only. Using them with duplex chain will result in misalignment and accelerated wear.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"K-type \u0026 #25 Chain（04C Chain） \/ 1\/4 inch (6.35mm) \/ 9T \u0026 6 mm","offer_id":52423343014162,"sku":"PENG072677x1","price":3.11,"currency_code":"USD","in_stock":true},{"title":"K-type \u0026 #25 Chain（04C Chain） \/ 1\/4 inch (6.35mm) \/ 9T \u0026 8 mm","offer_id":52423343046930,"sku":"PENG072678x1","price":3.11,"currency_code":"USD","in_stock":true},{"title":"K-type \u0026 #25 Chain（04C Chain） \/ 1\/4 inch (6.35mm) \/ 10T \u0026 5 mm","offer_id":52423343079698,"sku":"PENG072679x1","price":3.11,"currency_code":"USD","in_stock":true},{"title":"K-type \u0026 #25 Chain（04C Chain） \/ 1\/4 inch (6.35mm) \/ 10T \u0026 6 mm","offer_id":52423343112466,"sku":"PENG072680x1","price":3.25,"currency_code":"USD","in_stock":true},{"title":"K-type \u0026 #25 Chain（04C Chain） \/ 1\/4 inch (6.35mm) \/ 10T \u0026 8 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