{"product_id":"04c-roller-chain-sprockets-31t-70t-1-4-pitch-6-35mm-45-steel","title":"04C Roller Chain Sprockets 31T - 70T Chain Links 1\/4\" Pitch 6.35mm 45# Steel","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e04C Roller Chain Sprockets — Precision-Cut 1\/4\" Pitch Drive Components for Compact Machinery\u003c\/h2\u003e\n\u003cp\u003eWhen a worn or undersized sprocket causes chain skip, uneven wear, or unexpected downtime on your small-scale drive system, finding an exact-fit replacement in the right tooth count and bore diameter is the real challenge. These 04C roller chain sprockets are designed for engineers, hobbyists, and repair technicians who need a reliable, dimensionally accurate drive component without sourcing from an industrial distributor.\u003c\/p\u003e\n\u003cp\u003eEach sprocket is machined from 45# medium-carbon steel and engineered to the 04C (1\/4\" pitch, 6.35 mm) roller chain standard. Tooth counts span 31T through 70T, with bore diameters available from 8 mm (0.31 in) to 15 mm (0.59 in). The product line also includes matching 1\/4\" roller chain by the metre and individual chain links for complete drivetrain builds or repairs.\u003c\/p\u003e\n\u003cp\u003eTypical applications include small conveyor drives, go-kart and mini-bike reduction stages, robotics and automation platforms, and compact agricultural or garden equipment where 04C chain is the specified drive standard. Long-tail use cases such as \"04C sprocket replacement for mini conveyor\" or \"1\/4 pitch chain sprocket 40 tooth 10mm bore\" are covered across the full variant matrix.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔗\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for standard \u003cstrong\u003e04C \/ #25 roller chain\u003c\/strong\u003e with 1\/4\" (6.35 mm) pitch. Verify your bore diameter and tooth count before ordering. Chain links and roller chain lengths are also available in this listing.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 04C 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\u003eWide Tooth Count Range (31T–70T)\u003c\/strong\u003e\u003cbr\u003eCover low-speed high-torque and high-speed low-torque reduction ratios in a single product family — from compact 31-tooth pinions to large 70-tooth driven sprockets.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eMultiple Bore Diameters (8–15 mm)\u003c\/strong\u003e\u003cbr\u003eAvailable in 8 mm, 10 mm, 12 mm, 14 mm, and 15 mm bore sizes to fit a broad range of shaft diameters without custom machining.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e \u003cstrong\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e\u003cbr\u003eMachined from 45# steel for a balance of hardness, toughness, and machinability — resisting tooth wear under sustained cyclic loading.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003e04C \/ 1\/4\" Pitch Standard\u003c\/strong\u003e\u003cbr\u003eDimensionally matched to the 04C roller chain pitch of 6.35 mm, ensuring correct engagement geometry and smooth, low-noise chain wrap.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔗\u003c\/span\u003e \u003cstrong\u003eComplete Drivetrain Kit Options\u003c\/strong\u003e\u003cbr\u003ePair any sprocket with the matching 1\/4\" roller chain (sold by 0.5 m, 1.5 m, 5 m, or 10 m lengths) and 04C chain links or half-links available in the same listing.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e \u003cstrong\u003eBroad Application Fit\u003c\/strong\u003e\u003cbr\u003eSuited for mini conveyors, go-karts, robotics, garden machinery, and any compact drive system specifying 04C or #25 roller chain as the power transmission standard.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — 04C Roller Chain Sprockets\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eChain Standard\u003c\/th\u003e\n\u003ctd\u003e04C \/ #25 Roller Chain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch\u003c\/th\u003e\n\u003ctd\u003e1\/4\" (6.35 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e31T – 70T (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e8 mm \/ 10 mm \/ 12 mm \/ 14 mm \/ 15 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e45# Medium-Carbon 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\u003eHub Style\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\u003eSet Screw\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eChain Link Type\u003c\/th\u003e\n\u003ctd\u003e04C \/ 1\/4\" (available as add-on variant)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRoller Chain Lengths\u003c\/th\u003e\n\u003ctd\u003e0.5 m, 1.5 m, 5 m, 10 m (available as add-on variant)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAmount per Order\u003c\/th\u003e\n\u003ctd\u003e1 pcs \/ 5 pcs (see 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 choose the right tooth count for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\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 40T driven sprocket paired with a 20T driver gives a 2:1 reduction — the output shaft turns at half the input speed with twice the torque. Select a tooth count that achieves your target ratio while keeping chain wrap angle above 120° on the smaller sprocket.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I measure my shaft to select the correct bore diameter?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eUse a digital caliper to measure the outer diameter of your shaft at the mounting point. Available bore sizes are 8 mm, 10 mm, 12 mm, 14 mm, and 15 mm. The bore should match your shaft diameter exactly — a loose fit will cause vibration and accelerated wear. If your shaft requires a keyway or set screw, confirm those details in the variant options before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs 45# steel strong enough for my drive load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e45# medium-carbon steel has a tensile strength of approximately 600–800 MPa in its normalized state, making it suitable for moderate-duty cyclic drive loads typical of small conveyors, go-karts, and robotics. For heavy shock loads or continuous high-speed industrial duty, consider whether a hardened or alloy-steel sprocket is more appropriate for your specific application.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill these sprockets resist corrosion in outdoor or damp environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e45# steel without additional surface treatment will oxidize in humid or wet conditions. For outdoor or damp environments, apply a chain lubricant regularly and consider a protective coating such as zinc plating or paint. If corrosion resistance is a primary requirement, evaluate stainless-steel sprocket alternatives for your application.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these sprockets compatible with #25 roller chain as well as 04C?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The 04C designation and the ANSI #25 designation both refer to roller chain with a 1\/4\" (6.35 mm) pitch. These sprockets are dimensionally compatible with both designations. Always verify the roller diameter and inner link width of your existing chain against the sprocket tooth profile if you are mixing chain brands.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I order just the chain or chain links without a sprocket?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. This listing includes 1\/4\" roller chain sold by length (0.5 m, 1.5 m, 5 m, and 10 m) as well as individual 04C chain links (5-piece packs) and half-chain links. Select the appropriate option from the \"Number of Teeth\" dropdown — chain and link variants are listed alongside the sprocket tooth-count options.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I determine how much chain length I need?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eUse the standard chain length formula: L = 2C + (T₁ + T₂)\/2 + (T₂ − T₁)²\/(4π²C), where C is the center distance in pitches, T₁ is the small sprocket tooth count, and T₂ is the large sprocket tooth count. Round up to the nearest even link count. Add 10–15% extra when ordering chain by the metre to allow for trimming and future re-tensioning.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Number of Teeth and Bore Diameter above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"31T \/ 8mm \/ 1 pcs","offer_id":52423215153426,"sku":"GLFBNHHHXCDZH1663x1","price":19.43,"currency_code":"USD","in_stock":true},{"title":"31T \/ 10mm \/ 1 pcs","offer_id":52423215186194,"sku":"GLFBNHHHXCDZH1664x1","price":25.28,"currency_code":"USD","in_stock":true},{"title":"31T \/ 12mm \/ 1 pcs","offer_id":52423215218962,"sku":"GLFBNHHHXCDZH1665x1","price":25.28,"currency_code":"USD","in_stock":true},{"title":"32T \/ 8mm \/ 1 pcs","offer_id":52423215251730,"sku":"GLFBNHHHXCDZH1666x1","price":20.25,"currency_code":"USD","in_stock":true},{"title":"32T \/ 10mm \/ 1 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