{"id":2040,"date":"2026-04-08T05:50:59","date_gmt":"2026-04-08T05:50:59","guid":{"rendered":"https:\/\/drivensprockets.top\/product\/12b-metric-roller-chain-sprocket\/"},"modified":"2026-04-08T05:50:59","modified_gmt":"2026-04-08T05:50:59","slug":"12b-metric-roller-chain-sprocket","status":"publish","type":"product","link":"https:\/\/drivensprockets.top\/nn\/product\/12b-metric-roller-chain-sprocket\/","title":{"rendered":"12B Metric Roller Chain Sprocket"},"content":{"rendered":"
\n

12B Metric Roller Chain Sprocket \u2014 Heavy-Duty Power Transmission for Demanding Environments<\/h2>\n

The 12B sprocket is the workhorse of heavy-duty ISO metric chain drive systems. Operating at 19.05mm (3\/4 inch) pitch, it delivers substantially higher torque capacity than 08B and 10B sprockets, making it the preferred choice for mining conveyor drives, sugar mill machinery, timber processing equipment, and large-scale materials handling across Australian industry. We manufacture 12B sprockets in simplex (12B-1), duplex (12B-2), and triplex (12B-3) with tooth counts from 9 to 114.<\/p>\n

\n
\"12B<\/div>\n
\"12B<\/div>\n<\/div>\n

Technical Specifications<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\n12B-1 Simplex<\/th>\n12B-2 Duplex<\/th>\n12B-3 Triplex<\/th>\n<\/tr>\n<\/thead>\n
Pitch<\/td>\n19.05 mm (3\/4″)<\/td>\n19.05 mm<\/td>\n19.05 mm<\/td>\n<\/tr>\n
Roller Diameter<\/td>\n12.07 mm<\/td>\n12.07 mm<\/td>\n12.07 mm<\/td>\n<\/tr>\n
Internal Width<\/td>\n11.68 mm<\/td>\n11.68 mm<\/td>\n11.68 mm<\/td>\n<\/tr>\n
Tooth Count Range<\/td>\n9 – 114T<\/td>\n9 – 114T<\/td>\n9 – 114T<\/td>\n<\/tr>\n
Tooth Radius (r)<\/td>\n19 mm<\/td>\n19 mm<\/td>\n19 mm<\/td>\n<\/tr>\n
Radius Width C<\/td>\n2 mm<\/td>\n2 mm<\/td>\n2 mm<\/td>\n<\/tr>\n
Tooth Width B1<\/td>\n11.1 mm<\/td>\n11.1 mm<\/td>\n11.1 mm<\/td>\n<\/tr>\n
Standard<\/td>\nISO\/R 606, DIN 8187<\/td>\nISO\/R 606<\/td>\nISO\/R 606<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

12B Sprocket Wear Progression and Replacement Criteria<\/h2>\n

Understanding when to replace a 12B driven sprocket is critical for preventing chain failure in heavy-duty applications. The table below provides wear stage indicators:<\/p>\n

\n\n\n\n\n\n\n\n\n
Wear Stage<\/th>\nTooth Profile<\/th>\nAction Required<\/th>\nRemaining Life<\/th>\n<\/tr>\n<\/thead>\n
Stage 1: Normal<\/td>\nSymmetric flanks, no visible wear<\/td>\nContinue monitoring<\/td>\n100%<\/td>\n<\/tr>\n
Stage 2: Moderate<\/td>\nSlight asymmetry, loaded flank shows polishing<\/td>\nPlan replacement at next shutdown<\/td>\n40-60%<\/td>\n<\/tr>\n
Stage 3: Hook<\/td>\nHook\/wave shape on loaded flank, >25% material loss<\/td>\nReplace immediately<\/td>\n0-10%<\/td>\n<\/tr>\n
Stage 4: Critical<\/td>\nChain rides on tooth tips, skipping under load<\/td>\nEmergency replacement \u2014 risk of chain failure<\/td>\nOverdue<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

Key Advantages<\/h2>\n
\n
\n

2.4x<\/p>\n

Load capacity vs 08B simplex<\/p>\n<\/div>\n

\n

HRC 50<\/p>\n

Max tooth surface hardness<\/p>\n<\/div>\n

\n

0.025<\/p>\n

mm TIR bore concentricity<\/p>\n<\/div>\n

\n

3x<\/p>\n

Wear life vs unhardened<\/p>\n<\/div>\n<\/div>\n

\n

⚙ Heavy-Gauge Tooth Construction:<\/strong> Wider tooth faces and deeper root profiles than smaller pitch sprockets handle the higher chain tension encountered in mining and heavy industrial drives.<\/p>\n

🔥 Induction Hardened to HRC 40-50:<\/strong> Critical for abrasive environments \u2014 iron ore dust, coal fines, wood chips, and sugar cane fibre all accelerate tooth wear on unhardened sprockets.<\/p>\n

🛠 CNC Precision Manufacturing:<\/strong> Teeth hobbed to AGMA quality class. Bores to H7. Keyways to DIN 6885. Full dimensional inspection before dispatch.<\/p>\n

🏭 Material Certification:<\/strong> EN 10204 Type 3.1 available. Satisfies Australian mining AS\/NZS ISO 9001 audit requirements and RPEQ project documentation.<\/p>\n

✅ Split Sprocket Option:<\/strong> Available in split construction for field replacement without removing the chain. Essential for mining shutdown maintenance.<\/p>\n

📈 Multiple Hub Configurations:<\/strong> A-plate, B-hub, C-hub, taper-lock, and QD bushed versions to match your shaft and installation requirements.<\/p>\n<\/div>\n

Compatibility<\/h2>\n
\n\n\n\n\n\n\n\n\n
Component<\/th>\nSpecification<\/th>\n<\/tr>\n<\/thead>\n
Chain<\/td>\n12B-1, 12B-2, 12B-3 ISO roller chain (19.05mm pitch)<\/td>\n<\/tr>\n
Bore Range<\/td>\n8mm – 60mm (varies by tooth count)<\/td>\n<\/tr>\n
Keyway<\/td>\nDIN 6885 \/ AS 1403<\/td>\n<\/tr>\n
Not Compatible With<\/td>\nANSI #60 chain (different roller diameter and internal width despite similar pitch)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Selection Guide<\/h2>\n

By Load:<\/strong> 12B simplex handles approximately 2.4x the load of 08B simplex. Select duplex for 1.7x additional capacity, triplex for 2.5x. Consult horsepower rating charts for your operating speed.<\/p>\n

By Environment:<\/strong> C45 steel with black oxide for standard indoor. Zinc or zinc-nickel for outdoor. SS316 for marine, chemical, or food-grade. 4140 alloy steel for extreme fatigue and shock loading in mining.<\/p>\n

By Maintenance Access:<\/strong> Standard hub for permanent installations. Taper-lock for easy removal. Split sprocket where chain cannot be broken during replacement.<\/p>\n

Material and Process<\/h2>\n

Standard:<\/strong> C45 (1045) carbon steel, 570-700 MPa. High-Fatigue:<\/strong> 4140 alloy steel, 655-900 MPa for mining and heavy shock loads.<\/p>\n

Heat Treatment:<\/strong> Induction hardened tooth flanks HRC 40-50 with ductile core. Controlled depth prevents brittle fracture under impact loading.<\/p>\n

Surface:<\/strong> Black oxide, zinc, zinc-nickel, hot-dip galvanise, hard chrome, or electro-polish. Selected based on corrosion exposure and industry standards.<\/p>\n

Application Scenarios<\/h2>\n
\n
\"12B<\/p>\n

Mining Conveyor Drives<\/h4>\n

Primary and secondary conveyor head drives in iron ore, coal, and mineral processing. 4140 steel with induction-hardened teeth for abrasive dust environments. Duplex and triplex for drives exceeding 150 kW.<\/p>\n<\/div>\n

\"12B<\/p>\n

Sugar Milling & Timber Processing<\/h4>\n

Cane carrier chains, bagasse conveyors, sawmill log decks, and chip conveyors. SS316 or hard-chrome plated versions for corrosive sugar cane juice exposure.<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Customer Reviews<\/h2>\n
\n
\n

“12B triplex sprockets on our coal handling conveyor head drive. After 14 months tooth wear is under 2%. Outstanding quality compared to previous supplier.”<\/p>\n

★★★★★ \u2014 Maintenance Superintendent, Hunter Valley, Australia<\/p>\n<\/div>\n

\n

“We use 12B-2 on our sawmill log deck drives. Split sprocket option saved us significant shutdown time during replacement. Good dimensional accuracy.”<\/p>\n

★★★★★ \u2014 Mill Manager, Launceston, Australia<\/p>\n<\/div>\n

\n

“Reliable 12B sprockets for our European-made packaging machinery. Fit was perfect as OEM replacement. Material certification was included.”<\/p>\n

★★★★☆ \u2014 Technical Director, Dusseldorf, Germany<\/p>\n<\/div>\n

\n

“We ordered stainless steel 12B for our sugar mill cane carrier. The hard chrome finish is holding up well against the abrasive fibre. Will reorder.”<\/p>\n

★★★★★ \u2014 Plant Engineer, Mackay, Australia<\/p>\n<\/div>\n

\n

“Good heavy-duty sprockets for our cement plant conveyor. The 4140 alloy steel option handles the shock loading from irregular feed well.”<\/p>\n

★★★★☆ \u2014 Reliability Engineer, Mumbai, India<\/p>\n<\/div>\n<\/div>\n

FAQ<\/h2>\n
\nIs 12B the same as ANSI #60?<\/summary>\n
No. Both have 19.05mm pitch but 12B has a roller diameter of 12.07mm while ANSI #60 has 11.91mm. Internal widths also differ. They are not interchangeable. Always match sprocket to chain standard.<\/div>\n<\/details>\n
\nCan I get 4140 alloy steel for mining applications?<\/summary>\n
Yes. We manufacture 12B sprockets in 4140 alloy steel (655-900 MPa tensile) for high-fatigue mining applications. This material provides superior resistance to shock loading and cyclic stress compared to standard C45.<\/div>\n<\/details>\n
\nAre split 12B sprockets available?<\/summary>\n
Yes. Split hub construction allows replacement without breaking the chain. Available in common tooth counts for 12B-1 and 12B-2 configurations. Contact us for availability on specific sizes.<\/div>\n<\/details>\n
\nWhat is the maximum bore for 12B sprockets?<\/summary>\n
Maximum bore depends on tooth count. For 17T: approximately 25mm. For 25T: approximately 38mm. For 57T and above: approximately 70-80mm. We can machine to your shaft specification within the available hub diameter.<\/div>\n<\/details>\n
\nWhat surface treatment for coastal Queensland sugar mills?<\/summary>\n
We recommend either SS316 stainless steel for long-service installations or hard-chrome plated C45 steel for a balance of wear and corrosion resistance. Zinc-nickel plating is a cost-effective alternative for less aggressive exposure.<\/div>\n<\/details>\n

Related Products<\/h2>\n
\n
\"12B<\/p>\n

12B Roller Chains<\/p>\n<\/div>\n

\"Bushings\"<\/p>\n

Taper-Lock Bushings<\/p>\n<\/div>\n

\"Tensioner\"<\/p>\n

Chain Tensioners<\/p>\n<\/div>\n<\/div>\n

Installation<\/h2>\n

1.<\/strong> Confirm 12B chain pitch (19.05mm). Verify tooth count, bore, and keyway match shaft.<\/p>\n

2.<\/strong> Mount sprocket, insert key, torque set screws. For taper-lock: tighten bolts evenly in star pattern.<\/p>\n

3.<\/strong> Align drive\/driven sprockets within 0.5mm per 300mm centre distance using laser or straightedge.<\/p>\n

4.<\/strong> Install chain with 2-3% sag on slack side. For vertical drives, maintain minimum wrap angle of 120 degrees.<\/p>\n

5.<\/strong> Lubricate with ISO VG 68-100 oil for operating temperatures above 40C. ISO VG 30-50 below 40C.<\/p>\n

Maintenance<\/h2>\n

Lubricate:<\/strong> Oil at engagement point per schedule. Never use grease on roller chain.<\/p>\n

Inspect:<\/strong> Compare tooth profile against new template at each chain change. Check alignment quarterly in vibration-prone environments.<\/p>\n

Replace:<\/strong> At hook wear stage (see wear chart above) or if chain skips under load. Target: 2-3 chain lives per sprocket.<\/p>\n

Certifications<\/h2>\n

✅ ISO 9001:2015   ✅ ISO\/R 606   ✅ DIN 8187   ✅ EN 10204 Type 3.1   ✅ AS\/NZS audit compatible<\/p>\n

Why Ever-Power Australia<\/h2>\n
\n
\n

We are a full-range power transmission manufacturer with 15+ years serving Australian mining, agriculture, and manufacturing. 3,200+ sprocket SKUs, ISO 9001 certified, CNC hobbing and induction hardening capability. We provide 4140 alloy steel sprockets for mining, SS316 for food-grade, and engineering support for sprocket selection. OEM manufacturing with custom bore, surface treatment, and documentation to your requirements.<\/p>\n<\/div>\n

\"Ever-Power<\/div>\n<\/div>\n
\n

Request 12B Sprocket Quotation<\/h3>\n

Provide your 12B specifications including tooth count, bore, material, and quantity.<\/p>\n

Contact Us<\/a> All Sprockets<\/a>\n<\/div>\n

About Ever-Power Australia<\/a><\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

12B metric roller chain sprocket engineered for heavy-duty power transmission at 19.05mm (3\/4 inch) pitch. Manufactured from C45 carbon steel with induction-hardened teeth to HRC 40-50. Designed for mining conveyors, sugar mill cane carriers, timber processing, and industrial mixer drives across Australia. Available in simplex, duplex, and triplex configurations with 9 to 114 teeth. ISO\/R 606 and DIN 8187 compliant.<\/p>","protected":false},"featured_media":1986,"comment_status":"closed","ping_status":"open","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[3007,3006],"product_tag":[3021,3022,3024,3023,3009],"class_list":{"0":"post-2040","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-iso-metric-bs-sprockets","7":"product_cat-sprockets","8":"product_tag-12b-sprocket","9":"product_tag-19-05mm-pitch-sprocket","10":"product_tag-heavy-duty-driven-sprocket","11":"product_tag-iso-12b-sprocket","12":"product_tag-metric-roller-chain-sprocket","14":"first","15":"instock","16":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/drivensprockets.top\/nn\/wp-json\/wp\/v2\/product\/2040","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/drivensprockets.top\/nn\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/drivensprockets.top\/nn\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/drivensprockets.top\/nn\/wp-json\/wp\/v2\/comments?post=2040"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/drivensprockets.top\/nn\/wp-json\/wp\/v2\/media\/1986"}],"wp:attachment":[{"href":"https:\/\/drivensprockets.top\/nn\/wp-json\/wp\/v2\/media?parent=2040"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/drivensprockets.top\/nn\/wp-json\/wp\/v2\/product_brand?post=2040"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/drivensprockets.top\/nn\/wp-json\/wp\/v2\/product_cat?post=2040"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/drivensprockets.top\/nn\/wp-json\/wp\/v2\/product_tag?post=2040"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}