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External Tooth Spur Gears

External tooth spur gears are cylindrical gears with straight, radially projecting teeth for transmitting motion and torque between parallel shafts in various industrial applications. Their involute tooth profile ensures smooth and efficient power transmission, with material selection and gear properties influencing performance, load-carrying capacity, and service life. External tooth spur gears are widely used in aerospace, automotive, robotics, and manufacturing industries due to their simplicity, reliability, and cost-effectiveness.
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#34701
QB48
Boston Gear 30214780 QB48 non-metallic spur gear with 16 diametral pitch, 48 teeth, and 14.5° pressure angle. Designed for general industrial open gearing applications requiring quiet operation and reduced wear. Non-metallic construction provides self-lubricating properties and corrosion resistance.
Brand Boston Gear
Model QB48
$157.06 Each
Free Shipping orders over $100
#34947
S2412
Boston Gear 30215067 S2412 steel spur gear with 24 diametral pitch, 12 teeth, and 14.5 degree pressure angle. Precision-cut open gearing for general industrial drives, machine tools, and power transmission applications requiring fine-pitch steel spur gears.
Brand Boston Gear
Model S2412
$26.81 Each
Free shipping
#35083
YA20
Boston Gear 30215203 YA20 steel spur gear with 20 diametral pitch, 20 teeth, and 20° pressure angle. Designed for general industrial open gearing applications requiring precise power transmission and reliable performance in mechanical drive systems.
Brand Boston Gear
Model YA20
$42.43 Each
Free shipping
#35085
YA30
Boston Gear 30215205 YA30 steel spur gear with 20 diametral pitch, 30 teeth, and 20° pressure angle. Suitable for general industrial open gearing applications requiring precise tooth engagement and moderate load capacity.
Brand Boston Gear
Model YA30
$46.64 Each
Free shipping
#35110
YD24
Boston Gear YD24 30215230 steel spur gear with 12 diametral pitch, 24 teeth, and 20-degree pressure angle. Designed for general industrial power transmission applications requiring precise tooth engagement and load distribution.
Brand Boston Gear
Model YD24
$78.26 Each
Free shipping
#35246
NB40A
Boston Gear NB40A 30215988 steel spur gear with 16 diametral pitch, 40 teeth, and 14.5° pressure angle. Designed for general industrial open gearing applications requiring precise tooth engagement and moderate load capacity.
Brand Boston Gear
Model NB40A
$88.31 Each
Free shipping
#35247
NB48A
Boston Gear NB48A 30215989 steel spur gear with 16 diametral pitch, 48 teeth, and 14.5° pressure angle. Designed for general industrial open gearing applications requiring precise tooth engagement and moderate load capacity.
Brand Boston Gear
Model NB48A
$98.81 Each
Free shipping
#35265
ND42A
Boston Gear ND42A 30216007 steel spur gear with 12 diametral pitch, 42 teeth, and 14.5-degree pressure angle. Designed for general industrial open gearing applications requiring precise tooth engagement and reliable power transmission.
Brand Boston Gear
Model ND42A
$109.50 Each
Free Shipping orders over $100
#35313
NH48
Boston Gear NH48 30216057 steel spur gear with 8 diametral pitch, 48 teeth, and 14.5° pressure angle. Bored hub for shaft mounting. For general industrial power transmission applications requiring precise gear engagement.
Brand Boston Gear
Model NH48
$333.49 Each
Free Shipping orders over $100
#35413
YD48A
Boston Gear 30216164 YD48A steel spur gear with 12 diametral pitch, 48 teeth, and 20° pressure angle. Precision-machined steel construction for general industrial open gearing applications requiring high strength and wear resistance.
Brand Boston Gear
Model YD48A
$146.90 Each
Free Shipping orders over $100
#37310
ND12B-1/2
Boston Gear ND12B-1/2 30229684 steel spur gear with 12 diametral pitch, 12 teeth, and 14.5° pressure angle. Bored to 1/2 inch. For general industrial open gearing applications.
Brand Boston Gear
Model ND12B-1/2
$60.34 Each
Free shipping
#37338
NF20B-1
Boston Gear 30229712 NF20B-1 steel spur gear with 10 diametral pitch, 20 teeth, and 14.5° pressure angle. Bored to 1 inch for direct shaft mounting. Suitable for general industrial power transmission applications requiring precise gear engagement.
Brand Boston Gear
Model NF20B-1
$117.67 Each
Free Shipping orders over $100
#37382
YA20-1/2
Boston Gear 30229756 YA20-1/2 steel spur gear with 20 diametral pitch, 20 teeth, and 20° pressure angle. 1/2" bore. For general industrial open gearing applications.
Brand Boston Gear
Model YA20-1/2
$57.79 Each
Free shipping
#37395
YB20-5/8
Boston Gear 30229769 YB20-5/8 16 diametral pitch steel spur gear with 20 teeth, 20° pressure angle, and 5/8" bore. Precision open gearing for general industrial power transmission applications requiring reliable steel spur gear performance.
Brand Boston Gear
Model YB20-5/8
$64.27 Each
Free shipping
#37408
YD13-5/8
Boston Gear 30229782 YD13-5/8 steel spur gear with 12 diametral pitch, 13 teeth, 20° pressure angle, and 5/8" bore. Designed for general industrial open gearing applications requiring precise power transmission.
Read 1 review
Brand Boston Gear
Model YD13-5/8
$60.07 Each
Free shipping
#250758
C1284
Martin C1284 cast iron spur gear with 12 diametral pitch, 84 teeth, and 14.5-degree pressure angle. 7.166" outside diameter. Cast iron construction provides durability for power transmission applications. Plain bore design for custom machining to required shaft size.
Brand Martin Sprocket
Model C1284
$180.24 Each
Free Shipping orders over $100
#251103
S1015
Martin S1015 steel spur gear with 10 diametral pitch, 15 teeth, 14.5-degree pressure angle, and 1.700" outside diameter. Stock spur gear for power transmission applications. Compatible with other 14.5-degree PA gears.
Brand Martin Sprocket
Model S1015
$82.06 Each
Free shipping
#251112
S1020
Martin S1020 steel spur gear with 10 diametral pitch, 20 teeth, 14.5-degree pressure angle, and 2.200" outside diameter. 14.5-degree pressure angle gears are not interchangeable with 20-degree pressure angle gears. Steel construction for durability in power transmission applications.
Brand Martin Sprocket
Model S1020
$88.32 Each
Free shipping
#251125
S1030
Martin S1030 steel spur gear with 10 diametral pitch, 30 teeth, and 14.5-degree pressure angle. Features a plain bore for custom machining and 3.200" outside diameter. Suitable for power transmission applications requiring 14.5-degree PA.
Brand Martin Sprocket
Model S1030
$117.36 Each
Free Shipping orders over $100
#251133
S1048
Martin S1048 steel spur gear with 10 diametral pitch, 48 teeth, and 14.5-degree pressure angle. Plain bore design for custom shaft fitting. 5.000" outside diameter. Durable steel construction for power transmission applications.
Brand Martin Sprocket
Model S1048
$168.49 Each
Free Shipping orders over $100
#251137
S1060
Martin S1060 steel spur gear with 10 diametral pitch, 60 teeth, and 14.5-degree pressure angle. 6.200" outside diameter. Stock spur gear for industrial power transmission drives. Compatible only with 14.5-degree pressure angle gears.
Brand Martin Sprocket
Model S1060
$190.34 Each
Free Shipping orders over $100
#251140
S1212
Martin S1212 steel spur gear with 12 diametral pitch, 12 teeth, and 14.5-degree pressure angle. Outside diameter is 1.167". This 14.5-degree pressure angle gear is not interchangeable with 20-degree PA gears.
Brand Martin Sprocket
Model S1212
$51.96 Each
Free shipping
#251146
S1215
Martin S1215 steel spur gear with 12 diametral pitch, 15 teeth, and 14.5-degree pressure angle. 1.417" outside diameter. Precision-machined for smooth power transmission in industrial applications. Plain bore design allows custom boring to shaft requirements.
Brand Martin Sprocket
Model S1215
$65.06 Each
Free shipping
#251151
S1218
Martin S1218 steel spur gear with 12 diametral pitch, 18 teeth, and 14.5-degree pressure angle. Steel construction for durable power transmission. Outside diameter 1.667". Compatible with Boston Gear S1218 spur gears.
Brand Martin Sprocket
Model S1218
$70.92 Each
Free shipping
#251167
S1224
Martin S1224 steel spur gear with 12 diametral pitch, 24 teeth, and 14.5-degree pressure angle. Outside diameter is 2.166 inches. This stock spur gear is suitable for power transmission applications requiring precise tooth engagement.
Brand Martin Sprocket
Model S1224
$98.57 Each
Free shipping
#251175
S1230
Martin S1230 steel spur gear with 12 diametral pitch, 30 teeth, and 14.5-degree pressure angle. Plain bore design for custom machining. Outside diameter 2.667". Stock item for power transmission applications.
Brand Martin Sprocket
Model S1230
$88.32 Each
Free shipping
#251176
S1232
Martin S1232 steel spur gear with 12 diametral pitch, 32 teeth, and 14.5-degree pressure angle. Plain bore design for custom shaft fitting. Outside diameter is 2.833". For power transmission applications requiring precise gear meshing.
Brand Martin Sprocket
Model S1232
$96.39 Each
Free shipping
#251178
S1236
Martin S1236 steel spur gear with 12 diametral pitch, 36 teeth, and 14.5-degree pressure angle. Outside diameter is 3.167 inches. Suitable for power transmission applications requiring precise gear meshing.
Brand Martin Sprocket
Model S1236
$101.20 Each
Free Shipping orders over $100
#251180
S1240
Martin S1240 steel spur gear with 12 diametral pitch, 40 teeth, and 14.5-degree pressure angle. 3.500" outside diameter. Stock spur gear for power transmission applications. Compatible with other 14.5-degree PA gears.
Brand Martin Sprocket
Model S1240
$106.47 Each
Free Shipping orders over $100
#251183
S1248
Martin S1248 steel spur gear with 12 diametral pitch, 48 teeth, 14.5-degree pressure angle, and 4.166" outside diameter. Stock spur gear for power transmission applications. Compatible with other 14.5-degree PA gears.
Brand Martin Sprocket
Model S1248
$113.50 Each
Free Shipping orders over $100
#251201
S1616
Martin S1616 steel spur gear with 16 diametral pitch, 16 teeth, and 14.5-degree pressure angle. 1.125" outside diameter. Plain bore design for custom machining to required shaft size. Suitable for industrial power transmission applications.
Brand Martin Sprocket
Model S1616
$47.59 Each
Free shipping
#251204
S1618
Martin S1618 steel spur gear with 16 diametral pitch, 18 teeth, and 14.5-degree pressure angle. Outside diameter is 1.250". Compatible with other 14.5-degree pressure angle gears.
Brand Martin Sprocket
Model S1618
$50.98 Each
Free shipping
#251207
S1620
Martin S1620 steel spur gear with 16 diametral pitch, 20 teeth, and 14.5-degree pressure angle. Plain bore design for custom machining, 1.375" outside diameter. Suitable for power transmission applications requiring precise speed reduction and torque transfer.
Brand Martin Sprocket
Model S1620
$52.94 Each
Free shipping
#251243
S1640
Martin S1640 steel spur gear with 16 diametral pitch, 40 teeth, and 14.5-degree pressure angle. 2.626" outside diameter. Stock spur gear for power transmission drives, conveyor systems, and industrial machinery.
Brand Martin Sprocket
Model S1640
$87.51 Each
Free shipping
#251249
S1660
Martin S1660 steel spur gear with 16 diametral pitch, 60 teeth, and 14.5-degree pressure angle. 3.875" outside diameter. Stock spur gear for power transmission applications. 14.5-degree pressure angle gears are not interchangeable with 20-degree pressure angle gears.
Brand Martin Sprocket
Model S1660
$128.66 Each
Free Shipping orders over $100
#251250
S1664
Martin S1664 steel spur gear with 16 diametral pitch, 64 teeth, and 14.5-degree pressure angle. Outside diameter 4.125". Stock spur gear for power transmission applications. Compatible with other 14.5-degree PA gears.
Brand Martin Sprocket
Model S1664
$109.96 Each
Free Shipping orders over $100
#251256
S1696
Martin S1696 steel spur gear with 16 diametral pitch, 96 teeth, and 14.5-degree pressure angle. Precision-machined from durable steel, this gear has a 6.125" outside diameter. Suitable for power transmission applications requiring a 14.5° PA spur gear.
Brand Martin Sprocket
Model S1696
$142.76 Each
Free Shipping orders over $100
#251277
S2020
Martin S2020 steel spur gear with 20 diametral pitch, 20 teeth, and 14.5-degree pressure angle. Plain bore design for custom machining. Outside diameter is 1.100". Made from steel for durability in power transmission applications.
Brand Martin Sprocket
Model S2020
$46.63 Each
Free shipping
#251306
S2040
Martin S2040 steel spur gear with 20 diametral pitch, 40 teeth, and 14.5-degree pressure angle. Plain bore design for custom shaft fitting. Outside diameter is 2.100". For industrial power transmission applications.
Brand Martin Sprocket
Model S2040
$82.06 Each
Free shipping
#251326
S24120
Martin S24120 steel spur gear with 24 diametral pitch, 120 teeth, 14.5-degree pressure angle, and 5.083" outside diameter. Stock spur gear for power transmission applications. Compatible with other 14.5-degree PA gears.
Brand Martin Sprocket
Model S24120
$152.41 Each
Free Shipping orders over $100
#251337
S2424
Martin S2424 steel spur gear with 24 diametral pitch, 24 teeth, and 14.5-degree pressure angle. 1.083" outside diameter. Plain bore design for re-boring to required shaft size. Suitable for power transmission applications requiring precise gear engagement.
Brand Martin Sprocket
Model S2424
$58.73 Each
Free shipping
#251381
S412
Martin S412 steel spur gear with 4 diametral pitch, 12 teeth, and 14.5-degree pressure angle. Plain bore design for custom machining. Outside diameter 3.500". Stock spur gear for power transmission applications.
Brand Martin Sprocket
Model S412
$205.78 Each
Free Shipping orders over $100
#251387
S416
Martin S416 steel spur gear with 4 diametral pitch, 16 teeth, and 14.5-degree pressure angle. Plain bore design for custom machining to required shaft size. 4.500" outside diameter. Interchanges with Boston Gear and Browning equivalents.
Brand Martin Sprocket
Model S416
$274.84 Each
Free Shipping orders over $100
#251446
S612
Martin S612 steel spur gear with 6 diametral pitch, 12 teeth, 14.5-degree pressure angle, and 2.333" outside diameter. Plain bore design for power transmission applications. Direct replacement for Boston Gear S612.
Brand Martin Sprocket
Model S612
$115.14 Each
Free Shipping orders over $100
#251454
S615
Martin S615 steel spur gear with 6 diametral pitch, 15 teeth, and 14.5-degree pressure angle. Outside diameter is 2.833 inches. Plain bore design allows custom shaft fitting. Suitable for power transmission applications requiring precise gear engagement.
Brand Martin Sprocket
Model S615
$117.36 Each
Free Shipping orders over $100
#251476
S624
Martin S624 steel spur gear with 6 diametral pitch, 24 teeth, and 14.5-degree pressure angle. Plain bore design for custom machining. 4.333" outside diameter. Suitable for power transmission applications requiring moderate torque and speed.
Brand Martin Sprocket
Model S624
$205.78 Each
Free Shipping orders over $100
#251515
S820
Martin S820 steel spur gear with 8 diametral pitch, 20 teeth, and 14.5-degree pressure angle. Outside diameter is 2.750". Stock spur gear for power transmission applications. Compatible with other 14.5-degree PA gears.
Brand Martin Sprocket
Model S820
$133.08 Each
Free Shipping orders over $100
#251524
S824
Martin S824 steel spur gear with 8 diametral pitch, 24 teeth, and 14.5-degree pressure angle. 3.250" outside diameter. Stock spur gear for power transmission applications requiring 14.5-degree pressure angle.
Brand Martin Sprocket
Model S824
$139.22 Each
Free Shipping orders over $100
#251528
S832
Martin S832 steel spur gear with 8 diametral pitch, 32 teeth, and 14.5-degree pressure angle. Plain bore design for custom shaft fitting. Outside diameter 4.250". Stock gear for power transmission applications.
Brand Martin Sprocket
Model S832
$190.34 Each
Free Shipping orders over $100
#251606
TS1025
Martin TS1025 steel spur gear with 10 diametral pitch, 25 teeth, and 20-degree pressure angle. Features a 2.700" outside diameter. Designed for power transmission applications requiring precise tooth engagement. Compatible with other 20-degree pressure angle gears.
Brand Martin Sprocket
Model TS1025
$108.25 Each
Free Shipping orders over $100
#251633
TS1218
Martin TS1218 steel spur gear with 12 diametral pitch, 18 teeth, and 20-degree pressure angle. Features a 1.667" outside diameter. Suitable for power transmission applications requiring precise gear engagement.
Brand Martin Sprocket
Model TS1218
$70.24 Each
Free shipping
#251642
TS1224
Martin TS1224 steel spur gear with 12 diametral pitch, 24 teeth, and 20-degree pressure angle. Features a plain bore design for custom shaft fitting. Outside diameter is 2.166 inches. Ideal for power transmission applications requiring precise gear meshing and high strength.
Brand Martin Sprocket
Model TS1224
$97.65 Each
Free shipping
#251675
TS1620
Martin TS1620 steel spur gear with 16 diametral pitch, 20 teeth, and 20-degree pressure angle. 1.375" outside diameter. 20-degree PA provides higher load capacity and smoother operation than 14.5-degree gears. Stock gear for power transmission applications.
Brand Martin Sprocket
Model TS1620
$52.43 Each
Free shipping
#251704
TS1696
Martin TS1696 steel spur gear with 16 diametral pitch, 96 teeth, and 20-degree pressure angle. Features a 6.125" outside diameter. Designed for high-speed and high-load power transmission applications where 20-degree pressure angle gearing is required.
Brand Martin Sprocket
Model TS1696
$141.41 Each
Free Shipping orders over $100
#251717
TS2020
Martin TS2020 steel spur gear with 20 diametral pitch, 20 teeth, and 20-degree pressure angle. 1.100" outside diameter. Precision power transmission component for applications requiring 20-degree PA compatibility.
Brand Martin Sprocket
Model TS2020
$46.18 Each
Free shipping
#251721
TS2024
Martin TS2024 steel spur gear with 20 diametral pitch, 24 teeth, and 20-degree pressure angle. Plain bore design for custom machining. 1.300" outside diameter. Compatible with other 20-degree PA gears.
Brand Martin Sprocket
Model TS2024
$51.47 Each
Free shipping
#251726
TS2030
Martin TS2030 steel spur gear with 20 diametral pitch, 30 teeth, and 20-degree pressure angle. Outside diameter is 1.600". Suitable for power transmission applications requiring precise gear meshing.
Brand Martin Sprocket
Model TS2030
$58.18 Each
Free shipping
#251732
TS2040
Martin TS2040 steel spur gear with 20 diametral pitch, 40 teeth, and 20-degree pressure angle. Outside diameter is 2.100". Suitable for high-speed and high-load power transmission applications.
Brand Martin Sprocket
Model TS2040
$81.29 Each
Free shipping
#251750
TS420
Martin TS420 steel spur gear with 4 diametral pitch, 20 teeth, and 20-degree pressure angle. Features a 5.500" outside diameter. Suitable for power transmission applications requiring 20-degree PA gears.
Brand Martin Sprocket
Model TS420
$331.23 Each
Free Shipping orders over $100
#251858
TS832
Martin TS832 steel spur gear with 8 diametral pitch, 32 teeth, and 20-degree pressure angle. Features a 4.250" outside diameter. Designed for high-torque power transmission applications requiring precise gear meshing.
Brand Martin Sprocket
Model TS832
$188.54 Each
Free Shipping orders over $100