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  • Martin - 100BS - #100 Chain Bore to Size Sprocket

    • Martin - 100BS - #100 Chain Bore to Size Sprocket

    Martin

    SKU:
    100BS19 2 7/16
    UPC:
    697950298962

    Product Description

    Martin - 100BS - #100 Chain Bore to Size Sprocket

    Martin Sprocket & Gear — 102 Configurations

    Overview
    Specifications
    Applications

    Martin sprockets are precision-machined power transmission components designed for roller chain drive systems. Every tooth profile is cut to ANSI standards, ensuring smooth chain engagement, even load distribution, and maximum service life. Martin manufactures sprockets from high-carbon steel or ductile iron depending on the application, with hardened teeth available for high-load or abrasive environments.

    Proper sprocket selection directly impacts chain life, drive efficiency, and maintenance intervals. Martin’s bore-to-size (BS) sprockets come with a finished bore, keyway, and setscrew — ready to mount out of the box. For applications requiring a specific bore size, Martin also offers sprockets with QD (Quick Detachable) or taper bushing mounts for fast installation and removal.

    This product includes 102 variants (100BS8 1, 100BS8 1 3/16, 100BS8 1 1/4, 100BS9 1, 100BS9 1 3/16 and 97 more) covering common tooth counts and bore sizes for professional applications.

    • ANSI Tooth Profile — precision-cut for smooth chain engagement and even load distribution
    • Bore to Size — finished bore, keyway, and setscrew — ready to mount
    • High-Carbon Steel — hardened teeth for maximum wear resistance
    • Precision Machined — concentricity ensures smooth operation at speed
    • USA Heritage — Martin Sprocket & Gear, manufacturing since 1928
    Martin Sprocket & Gear Warranty — Martin products are warranted against defects in material and workmanship. Contact us for warranty claims and replacement.
    SKUTeethBoreODLTBWeight
    8 Teeth (3 bores) — OD: 3.770"
    100BS8 181" - 1in - 25.4mm3.770" - 3.77in - 95.8mm1.875" - 1.88in - 47.6mm2.20 lbs
    100BS8 1 3/1681 3/16" - 1.1875in - 30.16mm3.770" - 3.77in - 95.8mm1.875" - 1.88in - 47.6mm2.00 lbs
    100BS8 1 1/481 1/4" - 1.25in - 31.75mm3.770" - 3.77in - 95.8mm1.875" - 1.88in - 47.6mm2.00 lbs
    9 Teeth (4 bores) — OD: 4.180"
    100BS9 191" - 1in - 25.4mm4.180" - 4.18in - 106.2mm1.875" - 1.88in - 47.6mm3.15 lbs
    100BS9 1 3/1691 3/16" - 1.1875in - 30.16mm4.180" - 4.18in - 106.2mm1.875" - 1.88in - 47.6mm3.00 lbs
    100BS9 1 1/491 1/4" - 1.25in - 31.75mm4.180" - 4.18in - 106.2mm1.875" - 1.88in - 47.6mm2.80 lbs
    100BS9 1 7/1691 7/16" - 1.4375in - 36.51mm4.180" - 4.18in - 106.2mm1.875" - 1.88in - 47.6mm2.60 lbs
    10 Teeth (4 bores) — OD: 4.600"
    100BS10 1101" - 1in - 25.4mm4.600" - 4.60in - 116.8mm1.875" - 1.88in - 47.6mm4.00 lbs
    100BS10 1 3/16101 3/16" - 1.1875in - 30.16mm4.600" - 4.60in - 116.8mm1.875" - 1.88in - 47.6mm3.80 lbs
    100BS10 1 1/4101 1/4" - 1.25in - 31.75mm4.600" - 4.60in - 116.8mm1.875" - 1.88in - 47.6mm3.90 lbs
    100BS10 1 7/16101 7/16" - 1.4375in - 36.51mm4.600" - 4.60in - 116.8mm1.875" - 1.88in - 47.6mm3.60 lbs
    11 Teeth (7 bores) — OD: 5.010"
    100BS11 1111" - 1in - 25.4mm5.010" - 5.01in - 127.3mm1.875" - 1.88in - 47.6mm5.20 lbs
    100BS11 2112" - 2in - 50.8mm5.010" - 5.01in - 127.3mm1.875" - 1.88in - 47.6mm3.80 lbs
    100BS11 1 3/16111 3/16" - 1.1875in - 30.16mm5.010" - 5.01in - 127.3mm1.875" - 1.88in - 47.6mm5.00 lbs
    100BS11 1 1/4111 1/4" - 1.25in - 31.75mm5.010" - 5.01in - 127.3mm1.875" - 1.88in - 47.6mm5.00 lbs
    100BS11 1 7/16111 7/16" - 1.4375in - 36.51mm5.010" - 5.01in - 127.3mm1.875" - 1.88in - 47.6mm4.80 lbs
    100BS11 1 15/16111 15/16" - 1.9375in - 49.21mm5.010" - 5.01in - 127.3mm1.875" - 1.88in - 47.6mm4.00 lbs
    100BS11 2 3/16112 3/16" - 2.1875in - 55.56mm5.010" - 5.01in - 127.3mm1.875" - 1.88in - 47.6mm3.60 lbs
    12 Teeth (7 bores) — OD: 5.420"
    100BS12 1121" - 1in - 25.4mm5.420" - 5.42in - 137.7mm1.875" - 1.88in - 47.6mm6.40 lbs
    100BS12 2122" - 2in - 50.8mm5.420" - 5.42in - 137.7mm1.875" - 1.88in - 47.6mm5.25 lbs
    100BS12 1 3/16121 3/16" - 1.1875in - 30.16mm5.420" - 5.42in - 137.7mm1.875" - 1.88in - 47.6mm6.40 lbs
    100BS12 1 1/4121 1/4" - 1.25in - 31.75mm5.420" - 5.42in - 137.7mm1.875" - 1.88in - 47.6mm6.20 lbs
    100BS12 1 7/16121 7/16" - 1.4375in - 36.51mm5.420" - 5.42in - 137.7mm1.875" - 1.88in - 47.6mm6.00 lbs
    100BS12 1 15/16121 15/16" - 1.9375in - 49.21mm5.420" - 5.42in - 137.7mm1.875" - 1.88in - 47.6mm5.20 lbs
    100BS12 2 3/16122 3/16" - 2.1875in - 55.56mm5.420" - 5.42in - 137.7mm1.875" - 1.88in - 47.6mm4.80 lbs
    13 Teeth (7 bores) — OD: 5.820"
    100BS13 1131" - 1in - 25.4mm5.820" - 5.82in - 147.8mm1.625" - 1.62in - 41.3mm6.40 lbs
    100BS13 2132" - 2in - 50.8mm5.820" - 5.82in - 147.8mm1.625" - 1.62in - 41.3mm5.30 lbs
    100BS13 1 3/16131 3/16" - 1.1875in - 30.16mm5.820" - 5.82in - 147.8mm1.625" - 1.62in - 41.3mm6.20 lbs
    100BS13 1 1/4131 1/4" - 1.25in - 31.75mm5.820" - 5.82in - 147.8mm1.625" - 1.62in - 41.3mm6.20 lbs
    100BS13 1 7/16131 7/16" - 1.4375in - 36.51mm5.820" - 5.82in - 147.8mm1.625" - 1.62in - 41.3mm6.00 lbs
    100BS13 1 15/16131 15/16" - 1.9375in - 49.21mm5.820" - 5.82in - 147.8mm1.625" - 1.62in - 41.3mm5.40 lbs
    100BS13 2 3/16132 3/16" - 2.1875in - 55.56mm5.820" - 5.82in - 147.8mm1.625" - 1.62in - 41.3mm5.00 lbs
    14 Teeth (5 bores) — OD: 6.230"
    100BS14 2142" - 2in - 50.8mm6.230" - 6.23in - 158.2mm1.625" - 1.62in - 41.3mm6.40 lbs
    100BS14 1 1/4141 1/4" - 1.25in - 31.75mm6.230" - 6.23in - 158.2mm1.625" - 1.62in - 41.3mm7.40 lbs
    100BS14 1 7/16141 7/16" - 1.4375in - 36.51mm6.230" - 6.23in - 158.2mm1.625" - 1.62in - 41.3mm7.00 lbs
    100BS14 1 15/16141 15/16" - 1.9375in - 49.21mm6.230" - 6.23in - 158.2mm1.625" - 1.62in - 41.3mm6.40 lbs
    100BS14 2 3/16142 3/16" - 2.1875in - 55.56mm6.230" - 6.23in - 158.2mm1.625" - 1.62in - 41.3mm6.20 lbs
    15 Teeth (5 bores) — OD: 6.630"
    100BS15 2152" - 2in - 50.8mm6.630" - 6.63in - 168.4mm1.750" - 1.75in - 44.4mm8.10 lbs
    100BS15 1 1/4151 1/4" - 1.25in - 31.75mm6.630" - 6.63in - 168.4mm1.750" - 1.75in - 44.4mm9.00 lbs
    100BS15 1 7/16151 7/16" - 1.4375in - 36.51mm6.630" - 6.63in - 168.4mm1.750" - 1.75in - 44.4mm8.80 lbs
    100BS15 1 15/16151 15/16" - 1.9375in - 49.21mm6.630" - 6.63in - 168.4mm1.750" - 1.75in - 44.4mm8.20 lbs
    100BS15 2 3/16152 3/16" - 2.1875in - 55.56mm6.630" - 6.63in - 168.4mm1.750" - 1.75in - 44.4mm7.80 lbs
    16 Teeth (6 bores) — OD: 7.030"
    100BS16 2162" - 2in - 50.8mm7.030" - 7.03in - 178.6mm1.750" - 1.75in - 44.4mm8.80 lbs
    100BS16 1 7/16161 7/16" - 1.4375in - 36.51mm7.030" - 7.03in - 178.6mm1.750" - 1.75in - 44.4mm9.40 lbs
    100BS16 1 15/16161 15/16" - 1.9375in - 49.21mm7.030" - 7.03in - 178.6mm1.750" - 1.75in - 44.4mm9.00 lbs
    100BS16 2 3/16162 3/16" - 2.1875in - 55.56mm7.030" - 7.03in - 178.6mm1.750" - 1.75in - 44.4mm8.50 lbs
    100BS16 2 7/16162 7/16" - 2.4375in - 61.91mm7.030" - 7.03in - 178.6mm1.750" - 1.75in - 44.4mm8.00 lbs
    100BS16 2 15/16162 15/16" - 2.9375in - 74.61mm7.030" - 7.03in - 178.6mm1.750" - 1.75in - 44.4mm7.60 lbs
    17 Teeth (6 bores) — OD: 7.440"
    100BS17 2172" - 2in - 50.8mm7.440" - 7.44in - 189.0mm1.750" - 1.75in - 44.4mm9.40 lbs
    100BS17 1 7/16171 7/16" - 1.4375in - 36.51mm7.440" - 7.44in - 189.0mm1.750" - 1.75in - 44.4mm10.20 lbs
    100BS17 1 15/16171 15/16" - 1.9375in - 49.21mm7.440" - 7.44in - 189.0mm1.750" - 1.75in - 44.4mm9.80 lbs
    100BS17 2 3/16172 3/16" - 2.1875in - 55.56mm7.440" - 7.44in - 189.0mm1.750" - 1.75in - 44.4mm9.20 lbs
    100BS17 2 7/16172 7/16" - 2.4375in - 61.91mm7.440" - 7.44in - 189.0mm1.750" - 1.75in - 44.4mm8.80 lbs
    100BS17 2 15/16172 15/16" - 2.9375in - 74.61mm7.440" - 7.44in - 189.0mm1.750" - 1.75in - 44.4mm9.00 lbs
    18 Teeth (6 bores) — OD: 7.840"
    100BS18 2182" - 2in - 50.8mm7.840" - 7.84in - 199.1mm1.750" - 1.75in - 44.4mm10.20 lbs
    100BS18 1 7/16181 7/16" - 1.4375in - 36.51mm7.840" - 7.84in - 199.1mm1.750" - 1.75in - 44.4mm11.00 lbs
    100BS18 1 15/16181 15/16" - 1.9375in - 49.21mm7.840" - 7.84in - 199.1mm1.750" - 1.75in - 44.4mm10.40 lbs
    100BS18 2 3/16182 3/16" - 2.1875in - 55.56mm7.840" - 7.84in - 199.1mm1.750" - 1.75in - 44.4mm10.00 lbs
    100BS18 2 7/16182 7/16" - 2.4375in - 61.91mm7.840" - 7.84in - 199.1mm1.750" - 1.75in - 44.4mm9.60 lbs
    100BS18 2 15/16182 15/16" - 2.9375in - 74.61mm7.840" - 7.84in - 199.1mm1.750" - 1.75in - 44.4mm9.60 lbs
    19 Teeth (6 bores) — OD: 8.240"
    100BS19 2192" - 2in - 50.8mm8.240" - 8.24in - 209.3mm2.000" - 2.00in - 50.8mm12.00 lbs
    100BS19 1 7/16191 7/16" - 1.4375in - 36.51mm8.240" - 8.24in - 209.3mm2.000" - 2.00in - 50.8mm13.00 lbs
    100BS19 1 15/16191 15/16" - 1.9375in - 49.21mm8.240" - 8.24in - 209.3mm2.000" - 2.00in - 50.8mm12.33 lbs
    100BS19 2 3/16192 3/16" - 2.1875in - 55.56mm8.240" - 8.24in - 209.3mm2.000" - 2.00in - 50.8mm11.80 lbs
    100BS19 2 7/16192 7/16" - 2.4375in - 61.91mm8.240" - 8.24in - 209.3mm2.000" - 2.00in - 50.8mm11.20 lbs
    100BS19 2 15/16192 15/16" - 2.9375in - 74.61mm8.240" - 8.24in - 209.3mm2.000" - 2.00in - 50.8mm11.40 lbs
    20 Teeth (6 bores) — OD: 8.640"
    100BS20 2202" - 2in - 50.8mm8.640" - 8.64in - 219.5mm2.000" - 2.00in - 50.8mm13.00 lbs
    100BS20 1 7/16201 7/16" - 1.4375in - 36.51mm8.640" - 8.64in - 219.5mm2.000" - 2.00in - 50.8mm13.80 lbs
    100BS20 1 15/16201 15/16" - 1.9375in - 49.21mm8.640" - 8.64in - 219.5mm2.000" - 2.00in - 50.8mm13.00 lbs
    100BS20 2 3/16202 3/16" - 2.1875in - 55.56mm8.640" - 8.64in - 219.5mm2.000" - 2.00in - 50.8mm12.60 lbs
    100BS20 2 7/16202 7/16" - 2.4375in - 61.91mm8.640" - 8.64in - 219.5mm2.000" - 2.00in - 50.8mm12.20 lbs
    100BS20 2 15/16202 15/16" - 2.9375in - 74.61mm8.640" - 8.64in - 219.5mm2.000" - 2.00in - 50.8mm12.30 lbs
    21 Teeth (6 bores) — OD: 9.040"
    100BS21 2212" - 2in - 50.8mm9.040" - 9.04in - 229.6mm2.000" - 2.00in - 50.8mm13.90 lbs
    100BS21 1 7/16211 7/16" - 1.4375in - 36.51mm9.040" - 9.04in - 229.6mm2.000" - 2.00in - 50.8mm14.60 lbs
    100BS21 1 15/16211 15/16" - 1.9375in - 49.21mm9.040" - 9.04in - 229.6mm2.000" - 2.00in - 50.8mm13.80 lbs
    100BS21 2 3/16212 3/16" - 2.1875in - 55.56mm9.040" - 9.04in - 229.6mm2.000" - 2.00in - 50.8mm13.40 lbs
    100BS21 2 7/16212 7/16" - 2.4375in - 61.91mm9.040" - 9.04in - 229.6mm2.000" - 2.00in - 50.8mm13.05 lbs
    100BS21 2 15/16212 15/16" - 2.9375in - 74.61mm9.040" - 9.04in - 229.6mm2.000" - 2.00in - 50.8mm13.00 lbs
    22 Teeth (6 bores) — OD: 9.440"
    100BS22 2222" - 2in - 50.8mm9.440" - 9.44in - 239.8mm2.000" - 2.00in - 50.8mm15.00 lbs
    100BS22 1 7/16221 7/16" - 1.4375in - 36.51mm9.440" - 9.44in - 239.8mm2.000" - 2.00in - 50.8mm15.60 lbs
    100BS22 1 15/16221 15/16" - 1.9375in - 49.21mm9.440" - 9.44in - 239.8mm2.000" - 2.00in - 50.8mm15.00 lbs
    100BS22 2 3/16222 3/16" - 2.1875in - 55.56mm9.440" - 9.44in - 239.8mm2.000" - 2.00in - 50.8mm14.43 lbs
    100BS22 2 7/16222 7/16" - 2.4375in - 61.91mm9.440" - 9.44in - 239.8mm2.000" - 2.00in - 50.8mm13.80 lbs
    100BS22 2 15/16222 15/16" - 2.9375in - 74.61mm9.440" - 9.44in - 239.8mm2.000" - 2.00in - 50.8mm14.00 lbs
    23 Teeth (6 bores) — OD: 9.840"
    100BS23 2232" - 2in - 50.8mm9.840" - 9.84in - 249.9mm2.000" - 2.00in - 50.8mm15.80 lbs
    100BS23 1 7/16231 7/16" - 1.4375in - 36.51mm9.840" - 9.84in - 249.9mm2.000" - 2.00in - 50.8mm16.60 lbs
    100BS23 1 15/16231 15/16" - 1.9375in - 49.21mm9.840" - 9.84in - 249.9mm2.000" - 2.00in - 50.8mm16.00 lbs
    100BS23 2 3/16232 3/16" - 2.1875in - 55.56mm9.840" - 9.84in - 249.9mm2.000" - 2.00in - 50.8mm15.40 lbs
    100BS23 2 7/16232 7/16" - 2.4375in - 61.91mm9.840" - 9.84in - 249.9mm2.000" - 2.00in - 50.8mm14.80 lbs
    100BS23 2 15/16232 15/16" - 2.9375in - 74.61mm9.840" - 9.84in - 249.9mm2.000" - 2.00in - 50.8mm14.76 lbs
    24 Teeth (6 bores) — OD: 10.250"
    100BS24 2242" - 2in - 50.8mm10.250" - 10.25in - 260.3mm2.000" - 2.00in - 50.8mm17.10 lbs
    100BS24 1 7/16241 7/16" - 1.4375in - 36.51mm10.250" - 10.25in - 260.3mm2.000" - 2.00in - 50.8mm17.80 lbs
    100BS24 1 15/16241 15/16" - 1.9375in - 49.21mm10.250" - 10.25in - 260.3mm2.000" - 2.00in - 50.8mm17.00 lbs
    100BS24 2 3/16242 3/16" - 2.1875in - 55.56mm10.250" - 10.25in - 260.3mm2.000" - 2.00in - 50.8mm16.80 lbs
    100BS24 2 7/16242 7/16" - 2.4375in - 61.91mm10.250" - 10.25in - 260.3mm2.000" - 2.00in - 50.8mm16.20 lbs
    100BS24 2 15/16242 15/16" - 2.9375in - 74.61mm10.250" - 10.25in - 260.3mm2.000" - 2.00in - 50.8mm16.40 lbs
    25 Teeth (6 bores) — OD: 10.650"
    100BS25 2252" - 2in - 50.8mm10.650" - 10.65in - 270.5mm2.000" - 2.00in - 50.8mm18.00 lbs
    100BS25 1 7/16251 7/16" - 1.4375in - 36.51mm10.650" - 10.65in - 270.5mm2.000" - 2.00in - 50.8mm18.80 lbs
    100BS25 1 15/16251 15/16" - 1.9375in - 49.21mm10.650" - 10.65in - 270.5mm2.000" - 2.00in - 50.8mm18.20 lbs
    100BS25 2 3/16252 3/16" - 2.1875in - 55.56mm10.650" - 10.65in - 270.5mm2.000" - 2.00in - 50.8mm17.75 lbs
    100BS25 2 7/16252 7/16" - 2.4375in - 61.91mm10.650" - 10.65in - 270.5mm2.000" - 2.00in - 50.8mm17.20 lbs
    100BS25 2 15/16252 15/16" - 2.9375in - 74.61mm10.650" - 10.65in - 270.5mm2.000" - 2.00in - 50.8mm17.20 lbs

    Where Martin Sprockets Drive the Chain

    • Conveyor Systems — package handling, bulk material transport, and accumulation conveyors
    • Agricultural Equipment — combine chains, planter drives, grain elevator legs, and feed processing
    • Industrial Machinery — machine tool feeds, printing presses, and automated assembly lines
    • Mining & Aggregate — drag chains, bucket elevators, and apron feeders
    • Food & Beverage — washdown-rated drives, bottling lines, and packaging equipment

    1 All dimensions follow the Lambear tri-format: Imperial fraction – Decimal inches – Metric (mm).

    2 Specifications are catalog values. Contact us for application-specific recommendations.

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