{"id":1423,"date":"2026-07-31T06:49:32","date_gmt":"2026-07-31T06:49:32","guid":{"rendered":"https:\/\/metalite.net\/?post_type=product&p=1423"},"modified":"2026-07-31T07:11:45","modified_gmt":"2026-07-31T07:11:45","slug":"13t-idler-sprocket-1-1-4-pitch-ansi-100","status":"publish","type":"product","link":"https:\/\/metalite.net\/pl\/produkt\/13t-idler-sprocket-1-1-4-pitch-ansi-100\/","title":{"rendered":"13T Idler Sprocket 1-1\/4″ Pitch for ANSI 100 Roller Chain Drives"},"content":{"rendered":"
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Industrial Idler Sprockets for Smooth Chain Drive Operation<\/h1>\n

Precision-engineered replacement idler sprockets manufactured to maintain optimal chain tension, reduce vibration, and extend service life of roller chain drive systems. Available in 13-tooth configuration with 1-1\/4 inch pitch and 3\/4 inch bore diameter.<\/p>\n<\/div>\n

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Why Idler Sprockets Matter in Chain Drive Performance<\/h2>\n

In any roller chain power transmission system, maintaining correct chain tension directly determines operational efficiency and component longevity. An idler sprocket serves as a tensioning and guiding element positioned on the slack side of the chain loop. Unlike drive or driven sprockets, idler sprockets do not transmit power. Instead, they perform three critical functions: absorbing chain slack caused by elongation over time, increasing the wrap angle on smaller drive sprockets to prevent tooth skipping, and dampening chain vibration that accelerates wear on pins and bushings.<\/p>\n

The 13-tooth configuration with 1-1\/4 inch pitch is a common specification in agricultural machinery, industrial conveyors, and material handling equipment where ANSI 100 or equivalent roller chains are used. The 3\/4 inch bore accepts standard shaft sizes, allowing direct replacement without machine modification. Our roller chain idler sprockets<\/strong> are machined from C45 medium carbon steel with induction-hardened tooth profiles to a surface hardness of 45-52 HRC, measured at a depth of 1.5 mm from the tooth flank surface.<\/p>\n

Chain elongation is measurable and predictable. A standard roller chain operating under normal load conditions typically elongates 1.5% to 3% over its service life before requiring replacement. Without a properly functioning idler sprocket, this elongation creates slack that causes whipping, misalignment with driven sprockets, and uneven load distribution across engaged teeth. Installing a correctly sized replacement idler sprocket restores proper tension and prevents the cascading wear that leads to premature chain and bearing failure.<\/p>\n

\"Idler<\/p>\n<\/div>\n

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13T Idler Sprocket Technical Specifications<\/h2>\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>\nIndustrial Idler Sprocket<\/td>\n<\/tr>\n
Number of Teeth<\/strong><\/td>\n13T<\/td>\n<\/tr>\n
Chain Pitch<\/strong><\/td>\n1-1\/4 inch (31.75 mm)<\/td>\n<\/tr>\n
Bore Diameter<\/strong><\/td>\n3\/4 inch (19.05 mm)<\/td>\n<\/tr>\n
Compatible Chain Type<\/strong><\/td>\nANSI 100 \/ ISO 20B Roller Chain<\/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
Hardening Depth<\/strong><\/td>\n1.2-1.8 mm from tooth flank surface<\/td>\n<\/tr>\n
Surface Treatment<\/strong><\/td>\nBlack Oxide or Zinc Plated (per order specification)<\/td>\n<\/tr>\n
Manufacturer<\/strong><\/td>\nChina Fidel Group<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Note:<\/strong> This idler sprocket is a replacement component designed to fit standard ANSI 100 roller chain systems. The specifications listed are based on manufactured dimensions and material certifications. Custom bore sizes, keyway configurations, and set screw placements are available upon request for orders exceeding 50 units.<\/p>\n<\/div>\n

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Key Features of Our Replacement Idler Sprockets<\/h2>\n
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Induction Hardened Tooth Profile<\/h3>\n

Each tooth undergoes induction heating followed by controlled quenching to achieve 45-52 HRC surface hardness. This localized hardening leaves the sprocket core at 18-22 HRC, maintaining toughness to resist shock loads while the hardened flank surfaces resist abrasive wear from chain roller contact. The 1.2-1.8 mm effective case depth provides wear resistance through approximately 3,000-5,000 operating hours under normal loading before measurable tooth profile change occurs.<\/p>\n<\/div>\n

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Precision Hobbed Tooth Geometry<\/h3>\n

Teeth are cut using CNC hobbing machines with carbide cutters, producing tooth profile accuracy within DIN 8196 Class 8 standards. Each tooth flank is machined to match standard ANSI roller chain geometry, ensuring smooth chain engagement and disengagement with less than 0.15 mm radial runout measured at the pitch circle diameter. This precision reduces chain vibration amplitude by an estimated 12-18% compared to non-machined cast sprockets.<\/p>\n<\/div>\n

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Bore Tolerance Control<\/h3>\n

The 3\/4 inch bore is finish-reamed to H7 tolerance (+0.000 to +0.021 mm), providing a slip-fit installation on standard shaft diameters. This tolerance range eliminates the need for hammer fitting while preventing radial play that would cause eccentric rotation and uneven tooth loading. A 3\/16 inch standard keyway is broached to ANSI specifications. Custom bore diameters from 1\/2 inch to 1-1\/2 inch are available for custom made idler sprockets for machinery applications<\/strong>.<\/p>\n<\/div>\n

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Corrosion Resistant Finishing<\/h3>\n

Two surface treatment options are offered. Black oxide finishing provides a thin conversion coating (1-2 micron thickness) that reduces light corrosion during indoor storage while maintaining dimensional accuracy. Zinc plating with clear or yellow chromate delivers 8-12 micron coating thickness with salt spray resistance exceeding 72 hours to white rust per ASTM B117 testing. Select the finish based on your operating environment and storage conditions.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Idler Sprockets for Roller Chain and Conveyor Applications<\/h2>\n
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The 13T idler sprocket for 1-1\/4 inch pitch roller chain serves across multiple industrial sectors where ANSI 100 chain drives transmit power between rotating shafts. Its primary function remains consistent regardless of application: maintaining chain tension while guiding the chain path around obstacles or through complex routing configurations.<\/p>\n

Agricultural Machinery:<\/strong> Round balers, forage harvesters, and combine headers use idler sprockets on pickup reel drives and feed auger chain systems. The 13-tooth configuration provides the wrap angle necessary to prevent chain jumping when crop loads fluctuate suddenly. Operating environments expose these sprockets to dust, chaff, and occasional moisture, making the hardened tooth profile and corrosion-resistant finish essential for maintaining performance through harvest seasons.<\/p>\n

Material Handling Conveyors:<\/strong> Belt conveyors with chain-driven rollers, bucket elevators, and apron conveyors rely on conveyor idler sprockets<\/strong> to maintain tension across long chain spans. Chain elongation in conveyor systems typically measures 2-3% before replacement, and idler sprockets absorb this slack while keeping the chain engaged with drive sprockets. Our sprockets function as idler sprockets for conveyor chain and power transmission equipment<\/strong> in grain handling, aggregate processing, and packaging line applications.<\/p>\n

Industrial Power Transmission:<\/strong> Manufacturing equipment including stamping presses, injection molding machines, and textile machinery incorporates idler sprockets to route chains around machine frame obstructions and increase the arc of contact on smaller diameter drive sprockets. This replacement idler sprocket for roller chain drive<\/strong> systems installs directly onto existing shaft mounts with standard keyway and set screw retention.<\/p>\n

Construction Equipment:<\/strong> Asphalt pavers, concrete mixers, and road milling machines operate chain drives in abrasive conditions where proper tension prevents chain slap against guards and frame components. The induction-hardened teeth maintain profile integrity despite exposure to mineral dust and aggregate particles.<\/p>\n<\/div>\n<\/div>\n

\"chian\"<\/p>\n

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Custom Idler Sprockets for OEM Machinery Requirements<\/h2>\n
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Standard catalog sprockets meet common dimensional requirements, but machinery OEMs and maintenance operations frequently need modified specifications. China Fidel Group provides custom made idler sprockets for machinery applications<\/strong> with the following modification capabilities:<\/p>\n

Bore Modifications:<\/strong> Pilot bores, tapered bores for QD or Taper-Lock bushing systems, and stepped bores for shouldered shaft mounting are available. Bore diameters range from 12 mm to 50 mm for this sprocket body size. Keyways can be single, double, or omitted entirely for clamp-style hub retention.<\/p>\n

Hub Configurations:<\/strong> Standard sprockets can be produced with plain hub (Type A), one-side hub (Type B), or both-side hub (Type C) configurations. Hub diameter and length are adjustable based on shaft engagement requirements and axial space constraints within the machine frame.<\/p>\n

Material Alternatives:<\/strong> While C45 carbon steel is standard, we offer 40Cr alloy steel for higher strength requirements, 304 stainless steel for food-grade or washdown environments, and engineered plastics including UHMW-PE for light-load noise-sensitive applications.<\/p>\n

Additional Processing:<\/strong> Set screw tapping (one or two positions at 90 degrees), snap ring grooves, threaded bores, and drilled lubrication holes can be added to standard sprocket bodies. For high-volume production runs exceeding 500 units, we develop custom forging or casting tooling to reduce material waste and machining time.<\/p>\n

Technical drawing review, material certification, and dimensional inspection reports accompany all custom orders. First-article samples are provided before mass production begins, allowing customer verification of fit and function on target equipment.<\/p>\n<\/div>\n<\/div>\n

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Frequently Asked Questions About Idler Sprockets<\/h2>\n
\nHow do I determine when an idler sprocket needs replacement?<\/summary>\n

Measure tooth thickness at the pitch circle using a gear tooth caliper or sprocket wear gauge. Replace the sprocket when tooth thickness reduces by 8-10% from nominal dimension. Visual indicators include hooked tooth profiles, polished wear steps at the chain roller contact point, and measurable pitch variation exceeding 0.5 mm between adjacent teeth. Operating with worn idler sprockets accelerates new chain wear by forcing rollers to climb asymmetrical tooth profiles.<\/p>\n<\/details>\n

\nWhat chain types are compatible with this 13T idler sprocket?<\/summary>\n

This sprocket is machined for ANSI 100 roller chain with 1-1\/4 inch pitch. It is also compatible with ISO 20B chain, British Standard 1-1\/4 inch pitch chain, and equivalent metric roller chains matching this pitch dimension. The tooth profile follows standard sprocket tooth form for roller chain per ANSI B29.1. Verify chain manufacturer specifications if using specialty chains with thicker link plates or oversized rollers.<\/p>\n<\/details>\n

\nShould I replace only the idler sprocket or the entire set?<\/summary>\n

When the idler sprocket shows measurable wear, inspect the drive and driven sprockets simultaneously. If any sprocket in the system exceeds the 8% tooth wear threshold, replace all sprockets and install a new chain. Mixing worn and new components creates uneven load distribution and reduces new component service life. The idler sprocket typically wears faster than drive sprockets due to reduced wrap angle and higher contact pressure per tooth. A replacement idler sprocket for roller chain<\/a> drive<\/strong> systems installed mid-service life can restore tension, but the remaining components should be within acceptable wear limits for this approach to be effective.<\/p>\n<\/details>\n

\nWhat is the load capacity of this idler sprocket?<\/summary>\n

As a non-power-transmitting component, the idler sprocket primarily bears the tension load from chain wrap and directional change forces. The C45 steel body with 13 teeth at 1-1\/4 inch pitch handles chain tensions up to 3,500 lbs (15.6 kN) in tensioning applications. The limiting factor is typically the shaft bearing supporting the idler assembly rather than the sprocket itself. For specific load calculations, provide your chain pull force, wrap angle, and operating speed for engineering review.<\/p>\n<\/details>\n

\nCan you provide custom bore sizes or special tooth counts?<\/summary>\n

Yes. We manufacture idler sprockets for conveyor chain and power transmission equipment<\/strong> with custom specifications. Bore sizes from 1\/2 inch to 1-1\/2 inch, special keyway dimensions, tooth counts from 10T to 30T for 1-1\/4 inch pitch chain, and non-standard hub configurations are available. Minimum order quantity for custom dimensions is 50 units. Submit your drawing or specification requirements for quotation. First-article samples ship within 15 working days after drawing approval.<\/p>\n<\/details>\n

\nWhat lubrication practice is recommended for idler sprockets?<\/summary>\n

The idler sprocket itself requires no direct lubrication since it does not have internal bearings. However, the roller chain engaging with the sprocket should be lubricated per chain manufacturer recommendations, typically with SAE 30-50 weight oil for manual application or ISO VG 100-220 for automatic lubrication systems. Proper chain lubrication reduces friction at the roller-tooth interface, which directly extends sprocket tooth life. In dusty environments, use dry-film lubricants to avoid creating abrasive paste on tooth surfaces.<\/p>\n<\/details>\n<\/div>\n

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Source Precision Idler Sprockets for Your Chain Drive Systems<\/h2>\n

Contact China Fidel Group for standard and custom idler sprocket quotations. Standard 13T sprockets ship within 7 working days. Custom configurations available with engineering support and first-article sampling.<\/p>\n

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

This 13-tooth idler sprocket with 1-1\/4 inch pitch and 3\/4 inch bore is designed for ANSI 100 roller chain tensioning and guiding applications. Manufactured from C45 carbon steel with induction-hardened teeth (45-52 HRC), it maintains proper chain tension in agricultural machinery, industrial conveyors, and power transmission equipment. Available with black oxide or zinc plated finish.<\/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-1423","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\/pl\/wp-json\/wp\/v2\/product\/1423","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/metalite.net\/pl\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/metalite.net\/pl\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/metalite.net\/pl\/wp-json\/wp\/v2\/media\/1424"}],"wp:attachment":[{"href":"https:\/\/metalite.net\/pl\/wp-json\/wp\/v2\/media?parent=1423"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/metalite.net\/pl\/wp-json\/wp\/v2\/product_brand?post=1423"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/metalite.net\/pl\/wp-json\/wp\/v2\/product_cat?post=1423"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/metalite.net\/pl\/wp-json\/wp\/v2\/product_tag?post=1423"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}