<h2>Overview</h2>
<p>The <strong>Martin 40BS11 5/8</strong> is a precision bored-to-size roller chain sprocket engineered for reliable operation in industrial power transmission applications. Manufactured by Martin Sprocket & Gear, this 11-tooth sprocket is designed for #40 standard roller chain with 1/2″ pitch and delivers consistent performance in conveyor systems, machinery drives, and motion control equipment. The finished bore comes pre-machined with keyway and setscrews, making it shaft-ready and eliminating the need for bore finishing on-site.</p>
<h2>Key Features</h2>
<ul>
<li>Finished bore with 5/8″ diameter — shaft-ready, no additional machining required</li>
<li>Keyway on centerline of tooth and dual setscrews for secure shaft mounting</li>
<li>High-carbon steel construction ensures durability and extended service life</li>
<li>Bore concentric to pitch line, minimizing runout and wear</li>
<li>Conforms to ANSI B29.1 roller chain sprocket standards</li>
</ul>
<h2>Technical Specifications</h2>
<ul>
<li><strong>Part Number:</strong> 40BS11 5/8</li>
<li><strong>Chain Pitch:</strong> 1/2″ (#40 chain)</li>
<li><strong>Number of Teeth:</strong> 11</li>
<li><strong>Bore Diameter:</strong> 5/8″</li>
<li><strong>Bore Type:</strong> Finished Bored-to-Size</li>
<li><strong>Outside Diameter:</strong> 2.003″</li>
<li><strong>Length Through Bore:</strong> 7/8″</li>
<li><strong>Keyway:</strong> 3/16″ x 3/32″</li>
<li><strong>Fasteners:</strong> 2 setscrews (1/4-20 x 1/4″)</li>
<li><strong>Material:</strong> High-carbon steel</li>
<li><strong>Sprocket Type:</strong> Single-strand, Type BS</li>
<li><strong>Standards:</strong> ANSI B29.1-1975</li>
</ul>
<h2>Typical Applications</h2>
<ul>
<li>Conveyor drive systems and material handling equipment</li>
<li>Agricultural machinery and salt spreader drives</li>
<li>General-purpose power transmission and motor-driven applications</li>
<li>Industrial machinery requiring compact, low-speed/high-torque drives</li>
<li>Equipment retrofits where finished bores reduce installation time</li>
</ul>
<h2>Compatibility & Replacements</h2>
<h3>Compatible With</h3>
<ul>
<li>ANSI #40 standard roller chain (1/2″ pitch)</li>
<li>Any shaft sized 5/8″ diameter with 3/16″ keyway slot</li>
<li>Single-strand roller chain drive systems</li>
<li>Industrial equipment using 40-pitch chain transmission</li>
</ul>
<h3>Replaces / Drop-In Replacement For</h3>
<ul>
<li>Other Martin 40BS11 5/8 finished-bore sprockets</li>
<li>OEM sprockets in conveyor and material handling equipment with same specifications</li>
<li>Comparable 11-tooth, 40-pitch finished-bore sprockets from other manufacturers (verify bore and keyway dimensions before ordering)</li>
</ul>
<h3>Works With</h3>
<ul>
<li>Standard roller chain lubricants and maintenance systems</li>
<li>Shaft-coupling assemblies and motor mounts</li>
<li>Keyway-compatible shafts and set-screw fastening systems</li>
</ul>
