{"id":1427,"date":"2026-07-31T07:15:35","date_gmt":"2026-07-31T07:15:35","guid":{"rendered":"https:\/\/metalite.net\/?post_type=product&p=1427"},"modified":"2026-07-31T07:20:54","modified_gmt":"2026-07-31T07:20:54","slug":"12t-industrial-idler-sprocket-1-inch-pitch-ansi-80","status":"publish","type":"product","link":"https:\/\/metalite.net\/fr\/produit\/12t-industrial-idler-sprocket-1-inch-pitch-ansi-80\/","title":{"rendered":"12T Industrial Idler Sprocket for 1″ Pitch ANSI 80 Roller Chain"},"content":{"rendered":"
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12T Industrial Idler Sprocket for Reliable Roller Chain Drive Systems<\/h1>\n

Precision-machined 12-tooth industrial idler sprocket engineered for 1-inch pitch roller chain systems. Maintains optimal chain tension, reduces vibration, and extends drivetrain component service life in demanding industrial and agricultural applications.<\/p>\n<\/div>\n

\"industrial<\/p>\n

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Understanding the Role of an Idler Sprocket in Power Transmission<\/h2>\n

In roller chain drive systems, an idler sprocket functions as a tensioning and guiding component positioned on the slack side of the chain loop. Unlike drive sprockets that transmit rotational force, or driven sprockets that receive it, the idler sprocket absorbs chain slack caused by normal wear elongation, increases wrap angle on smaller sprockets to prevent tooth skipping, and dampens vibration that accelerates pin and bushing wear. This chain idler sprocket<\/strong> does not transmit torque, but its dimensional accuracy and material quality directly influence overall drivetrain reliability.<\/p>\n

The 12-tooth configuration with 1-inch pitch (ANSI 80 equivalent) represents one of the most commonly specified sizes in material handling, agricultural machinery, and industrial manufacturing equipment. The tooth profile is CNC-hobbed from C45 medium carbon steel, then induction-hardened to achieve 45-52 HRC surface hardness with a core hardness of 18-22 HRC. This dual-hardness structure provides wear-resistant tooth flanks while maintaining sufficient toughness in the sprocket body to absorb shock loads without crack propagation.<\/p>\n

Chain elongation follows a predictable pattern. Standard roller chain operating under normal load conditions elongates 1.5% to 3% over its service life. Without a properly functioning idler sprocket, this elongation produces chain slack that manifests as whipping, misalignment, and uneven load distribution across engaged teeth. Installing a correctly specified replacement industrial idler sprocket<\/strong> restores tension balance and interrupts the accelerated wear cycle that leads to premature chain and bearing failure.<\/p>\n<\/div>\n

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Features of Our Industrial Idler Sprocket<\/h2>\n
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Induction-Hardened Tooth Surfaces<\/h3>\n

Each tooth undergoes precision induction heating followed by controlled quenching, producing a surface hardness of 45-52 HRC measured at 1.5 mm depth from the tooth flank. This hardened layer resists abrasive wear from continuous roller chain contact while the softer core (18-22 HRC) absorbs impact energy. Laboratory testing shows approximately 3,000-5,000 operating hours before measurable tooth profile changes occur under standard loading conditions.<\/p>\n<\/div>\n

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CNC-Hobbed Tooth Geometry<\/h3>\n

Teeth are cut using carbide-tipped hobs on CNC gear hobbing machines, achieving tooth profile accuracy within DIN 8196 Class 8 tolerances. Radial runout at the pitch circle measures less than 0.15 mm, ensuring smooth roller engagement and disengagement. This precision reduces chain vibration amplitude by 12-18% compared to cast sprockets with non-machined tooth profiles, contributing to quieter operation and reduced chain wear rates.<\/p>\n<\/div>\n

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Precision Bore and Hub Machining<\/h3>\n

The bore diameter is finish-reamed to H7 tolerance, providing consistent slip-fit installation on standard shaft diameters. The hub face is machined perpendicular to the bore axis within 0.05 mm TIR, eliminating wobble that causes uneven tooth loading. As a 12 tooth idler sprocket for roller chain<\/strong> systems, this precision ensures the chain tracks correctly across the sprocket face without edge loading or accelerated side plate wear.<\/p>\n<\/div>\n

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Corrosion-Resistant Surface Options<\/h3>\n

Available with black oxide finish providing light corrosion protection for indoor storage, or zinc plating with 8-12 micron thickness achieving 72+ hours salt spray resistance per ASTM B117. The zinc option is recommended for equipment operating in humid environments, outdoor applications, or washdown conditions where moisture exposure is frequent.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Technical Specifications of 12T Idler Sprocket<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nSpecification<\/th>\n<\/tr>\n
Product Type<\/strong><\/td>\nChain Idler Sprocket<\/td>\n<\/tr>\n
Number of Teeth (Z)<\/strong><\/td>\n12<\/td>\n<\/tr>\n
Chain Pitch<\/strong><\/td>\n1 inch \u00d7 17.02 mm (ANSI 80)<\/td>\n<\/tr>\n
Outside Diameter (de)<\/strong><\/td>\n109.0 mm<\/td>\n<\/tr>\n
Pitch Circle Diameter (dp)<\/strong><\/td>\n98.14 mm<\/td>\n<\/tr>\n
Tooth Width (A)<\/strong><\/td>\n16.2 mm<\/td>\n<\/tr>\n
Hub Diameter (D1)<\/strong><\/td>\n20 mm<\/td>\n<\/tr>\n
Hub Width (F)<\/strong><\/td>\n47 mm<\/td>\n<\/tr>\n
Bore Diameter (B)<\/strong><\/td>\n14 mm (Standard)<\/td>\n<\/tr>\n
Keyway Width (H)<\/strong><\/td>\n17.7 mm<\/td>\n<\/tr>\n
Material<\/strong><\/td>\nC45 Medium Carbon Steel<\/td>\n<\/tr>\n
Tooth Hardness<\/strong><\/td>\n45-52 HRC (Induction Hardened)<\/td>\n<\/tr>\n
Surface Treatment<\/strong><\/td>\nBlack Oxide or Zinc Plated<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Note:<\/strong> Standard bore diameter is 14 mm with 17.7 mm keyway. Custom bore sizes, keyway dimensions, and hub configurations are available. Contact our engineering team with your specifications for custom orders. This sprocket is also available in additional tooth counts for 1-inch pitch chain, including 10T through 18T configurations. Consult the specification chart for complete dimensional data across the product range.<\/p>\n<\/div>\n

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Replacement Industrial Idler Sprocket for Roller Chain Applications<\/h2>\n
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This 12T sprocket is part of a complete range of industrial roller chain idler sprocket supplier<\/strong> products available from China Fidel Group. The following configurations are manufactured for common roller chain specifications:<\/p>\n

\n\n\n\n\n\n\n\n\n
Z<\/th>\nPitch<\/th>\nde (mm)<\/th>\ndp (mm)<\/th>\nA (mm)<\/th>\nD1 (mm)<\/th>\nF (mm)<\/th>\nB (mm)<\/th>\nH (mm)<\/th>\n<\/tr>\n
12<\/td>\n1\u2033\u00d717.02<\/td>\n109.0<\/td>\n98.14<\/td>\n16.2<\/td>\n20<\/td>\n47<\/td>\n14<\/td>\n17.7<\/td>\n<\/tr>\n
13<\/td>\n1\u20331\/4\u00d73\/4\u2033<\/td>\n147.8<\/td>\n132.65<\/td>\n18.5<\/td>\n25<\/td>\n52<\/td>\n15<\/td>\n21.0<\/td>\n<\/tr>\n
15<\/td>\n3\/4\u2033\u00d77\/16\u2033<\/td>\n99.8<\/td>\n91.63<\/td>\n11.1<\/td>\n16<\/td>\n40<\/td>\n12<\/td>\n18.3<\/td>\n<\/tr>\n
17<\/td>\n5\/8\u2033\u00d73\/8\u2033<\/td>\n93.0<\/td>\n86.39<\/td>\n9.1<\/td>\n16<\/td>\n40<\/td>\n12<\/td>\n18.3<\/td>\n<\/tr>\n
21<\/td>\n3\/8\u2033\u00d77\/32\u2033<\/td>\n68.0<\/td>\n63.90<\/td>\n5.3<\/td>\n16<\/td>\n40<\/td>\n12<\/td>\n18.3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

The complete range covers chain pitches from 3\/8 inch to 1-1\/4 inch with tooth counts from 12T to 23T. Each configuration maintains consistent material specifications and heat treatment standards. Contact us for full dimensional catalogs or to discuss custom configurations outside these standard ranges.<\/p>\n<\/div>\n<\/div>\n

\"industrial<\/p>\n

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Applications of Industrial Idler Sprocket in Industrial Equipment<\/h2>\n
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The 12-tooth industrial idler sprocket<\/strong> for 1-inch pitch roller chain serves across multiple sectors where ANSI 80 chain drives transmit power or move materials. Its primary functions\u2014maintaining chain tension and guiding chain routing\u2014remain consistent regardless of application, but operating conditions and performance requirements vary significantly by industry.<\/p>\n

Agricultural Machinery:<\/strong> Combine harvesters, forage harvesters, and square balers use idler sprockets on header drives, feeder house chains, and pickup reel systems. The 12T configuration provides adequate wrap angle to prevent chain jumping when crop intake fluctuates suddenly. Dust, chaff, and moisture are constant environmental factors, making induction-hardened teeth and corrosion-resistant finishing essential specifications for agricultural duty cycles.<\/p>\n

Material Handling Conveyors:<\/strong> Chain-driven roller conveyors, bucket elevators, and apron conveyors depend on chain idler sprocket<\/strong> components to maintain tension across spans that may exceed 10 meters. Chain elongation in conveyor applications typically reaches 2-3% before replacement, and idler sprockets positioned at tensioning points absorb this slack while keeping the chain properly engaged with drive sprockets at both ends of the system.<\/p>\n

Manufacturing Equipment:<\/strong> Stamping presses, injection molding machines, packaging lines, and textile machinery incorporate idler sprockets to route chains around frame obstructions, increase arc of contact on smaller drive sprockets, and maintain tension in multi-shaft drive systems. These applications often operate continuously in 2-3 shift production schedules, accumulating 4,000-6,000 operating hours annually.<\/p>\n

Construction and Mining Equipment:<\/strong> Asphalt pavers, concrete batch plants, crushers, and screening equipment use roller chain drives in abrasive environments. The idler sprocket must maintain dimensional stability despite exposure to mineral dust, aggregate particles, and vibration levels that exceed typical industrial settings. Induction hardening provides the surface durability required for these conditions.<\/p>\n<\/div>\n<\/div>\n

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Frequently Asked Questions About Idler Sprocket<\/h2>\n
\nWhat is an idler sprocket used for?<\/summary>\n

An idler sprocket serves three functions in roller chain drive systems. First, it maintains proper chain tension by absorbing slack that develops as chains elongate through normal wear. Second, it guides chain routing around obstacles or through complex paths within machine frames. Third, it increases the wrap angle on smaller diameter drive sprockets, which prevents tooth skipping under fluctuating loads. Unlike drive or driven sprockets, an idler sprocket does not transmit torque. It rotates freely on its bearing or bushing, driven only by chain movement. Properly specified and maintained idler sprockets extend chain life by 15-25% compared to systems operated with incorrect tension.<\/p>\n<\/details>\n

\nWhat chain types can work with an idler sprocket?<\/summary>\n

This industrial roller chain idler sprocket supplier<\/strong> product line is compatible with standard ANSI and ISO roller chains matching the specified pitch. The 12T sprocket described here works with ANSI 80 chain (1-inch pitch). It is also compatible with ISO 16B chain, British Standard 1-inch pitch roller chain, and equivalent metric chains. The tooth profile is machined to ANSI B29.1 sprocket tooth form standards, which ensures correct roller engagement with standard chain dimensions. Double-pitch roller chains and specialty attachment chains may require different tooth profiles. Verify chain manufacturer specifications if using non-standard chain types.<\/p>\n<\/details>\n

\nWhat is the difference between an idler sprocket and a drive sprocket?<\/summary>\n

The fundamental difference is function. A drive sprocket transmits rotational force from the power source to the chain, experiencing torque loads and requiring a keyed or clamped connection to its shaft. A driven sprocket receives power from the chain and transfers it to the driven shaft. An idler sprocket transmits no power. It rotates freely, positioned on the slack side of the chain loop solely to maintain tension and guide chain routing. Because idler sprockets do not experience torque, they can use simpler mounting methods. However, their tooth surfaces experience the same contact stresses as drive sprockets, which is why our 12 tooth idler sprocket for roller chain<\/strong> systems uses the same induction hardening process applied to our drive sprockets.<\/p>\n<\/details>\n

\nCan you manufacture custom idler sprockets based on drawings?<\/summary>\n

Yes. China Fidel Group manufactures custom idler sprockets to customer specifications. We accept technical drawings in PDF, DWG, DXF, or STEP formats. Custom parameters include non-standard bore diameters, special keyway dimensions, modified hub configurations, alternative tooth counts, and non-standard materials such as 40Cr alloy steel, 304 stainless steel, or engineered polymers. Minimum order quantity for custom sprockets is 50 units per specification. We provide first-article samples for customer approval before proceeding with batch production. Typical lead time is 15-20 working days from drawing confirmation to sample shipment, with production quantities following within 25-30 working days.<\/p>\n<\/details>\n

\nHow do I choose the correct idler sprocket size?<\/summary>\n

Selecting the correct industrial idler sprocket<\/strong> requires four measurements. First, measure chain pitch, which is the center-to-center distance between adjacent chain pins divided by two. This sprocket suits 1-inch pitch chain. Second, count the chain roller width to confirm it matches the sprocket tooth width specification of 16.2 mm. Third, measure the shaft diameter where the idler will mount and verify it matches the 14 mm standard bore or specify a custom bore. Fourth, consider the tooth count. A 12-tooth idler provides a pitch circle diameter of 98.14 mm. Larger tooth counts produce larger diameters, which reduce rotational speed and bearing load but require more mounting space. If you have the original sprocket part number or chain specification, provide these for direct cross-referencing. Our technical team can assist with selection based on your chain type and installation space constraints.<\/p>\n<\/details>\n<\/div>\n

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Source Precision Industrial Idler Sprockets for Your Equipment<\/h2>\n

Contact China Fidel Group for standard 12T idler sprocket pricing, custom configuration quotations, and bulk order terms. Standard sprockets ship within 7 working days. Custom orders include engineering review and first-article sampling.<\/p>\n

Request Quotation<\/a><\/p>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

This 12-tooth industrial idler sprocket is engineered for 1-inch pitch ANSI 80 roller chain systems. Machined from C45 carbon steel with induction-hardened teeth (45-52 HRC), it maintains proper chain tension and guides chain routing in agricultural machinery, material handling conveyors, and manufacturing equipment. Outside diameter 109 mm, pitch circle diameter 98.14 mm, standard bore 14 mm.<\/p>","protected":false},"featured_media":1424,"template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[53],"product_tag":[],"class_list":["post-1427","product","type-product","status-publish","has-post-thumbnail","product_cat-idler-sprockets","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/metalite.net\/fr\/wp-json\/wp\/v2\/product\/1427","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/metalite.net\/fr\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/metalite.net\/fr\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/metalite.net\/fr\/wp-json\/wp\/v2\/media\/1424"}],"wp:attachment":[{"href":"https:\/\/metalite.net\/fr\/wp-json\/wp\/v2\/media?parent=1427"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/metalite.net\/fr\/wp-json\/wp\/v2\/product_brand?post=1427"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/metalite.net\/fr\/wp-json\/wp\/v2\/product_cat?post=1427"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/metalite.net\/fr\/wp-json\/wp\/v2\/product_tag?post=1427"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}