Image for Illustration purposes only. Actual product may vary

Martin 50BS20 7/8 Type B Finished Bore roller chain sprocket for #50 chain (5/8" pitch), 20 teeth, 7/8" finished bore with keyway and setscrews, 4.321" outside diameter. Steel construction for power transmission drives. Single-strand, one-hub design for standard re-boring or finished bore applications.

Name: Martin 50BS20 7/8 Type B Finished Bore roller chain sprocket for #50 chain (5/8" pitch), 20 teeth, 7/8" finished bore with keyway and setscrews, 4.321
Brand: Martin Sprocket
Price: 60.15 USD
Availability: InStock
Rating: 5.0 (4 reviews)

MODEL 50BS20 7/8

BRAND

Martin Sprocket

SKU

262732

WEIGHT

1.940 lb

UOM

each

Contact supplier for technical support on: 323-728-8117

$60.15 Each

Prices are subject to change

FREE SHIPPING ON ORDERS OVER $100

Select Quantity

GET A QUOTE

Typically Ships in: 1 day

Returnable: See conditions

Bore

7/8"

Material

Steel

Number Of Teeth

Outside Dia

4.321"

Pitch

0.625 in.

Teeth

Material	Steel	Hub Outside Diameter	3.000 in.
Chain Number	50	Length thru Bore	1.000 in.
Chain Pitch	0.625 in.	Hub Recessed For Chain	No
Number of Chain Rows	1	Construction Detail	Solid
Number of Teeth	20	Bore Type	Bored To Size
Outside Diameter	4.321 in.	Finished Bore Size	0.875 in.
Pitch Diameter	3.995 in.	Key Way Size	3/16x3/32 in.
Single Strand Tooth Thickness	0.343 in.	Set Screw Size	1/4-20X1/4 in.
Hardened Teeth	No	Set Screw Location	(2) Set Screws (1) Over Kw And (1) At 90
Hub Configuration	B
Storage Dimension Length	4.625 in.	Weight	1.95 lbs.
Storage Dimension Width	4.625 in.	Individually Packaged	Yes
Storage Dimension Height	1.060 in.

SKU: 250096

Durable and high quality

I bought a second one to keep as a spare, but the first one still hasn’t shown any signs of wear. Seems like a quality part.

SKU: 251157

21 tooth 12 dp spur gear

The 21 tooth 12 DP gear I bought arrived very quickly. It was exactly what I needed to fix my RV slide out. I had to machine it to fit, but I knew that when I ordered it. VERY SATISFIED!!!

SKU: 264057

Great service and selection

I was very pleased to find this on the shelf. The price was fair, and the delivery was prompt. I will do business again with MRO

SKU: 263484

Solid product at a great price

Solid product, fair and super fast shipping! MROSUPPLY delivers it all!

When will I be charged for my order?

Do you provide credit terms?

Can I get a discounted price? I am a reseller / government entity.

What is the return/warranty policy?

Can it be shipped today?

Does “Usually ships in 24 hours” mean it’s in stock?

Read full FAQ

Suggested Items

#262471

Martin 50A14 Type A plain bore roller chain sprocket for #50 chain with 5/8" pitch and 14 teeth. Steel construction with flat plate design and no hub for lightweight power transmission. Outside diameter is 3.113".

Brand

Martin Sprocket

Model

50A14

$27.78 Each

Free shipping

#262472

Martin 50A15 Type A plain bore roller chain sprocket for #50 chain with 5/8" pitch, 15 teeth, and 3.315" outside diameter. Steel construction with flat plate design and no hub. Suitable for applications requiring a lightweight, compact sprocket that can be bored to size.

Brand

Martin Sprocket

Model

50A15

$28.54 Each

Free shipping

#2265642

HKK RC050R1A (50R10) ANSI 50 single strand roller chain, 5/8" pitch, 10 ft reel. Solid bushings and rollers, 0.200" pin diameter, 0.571" plate height, 0.080" plate thickness, 3/8" roller width, 0.400" roller diameter. Average ultimate strength 7,200 lbs, maximum allowable load 1,620 lbs. ANSI B29.1 compliant. Made in Japan.

Brand

HKK Chain

Model

50R10

Obsolete

See Replacement

#262468

Martin 50A112 Type A plain bore roller chain sprocket for #50 chain (5/8" pitch), 112 teeth, steel construction. Flat plate design with no hub, 22.651" outside diameter. Suitable for applications requiring a lightweight, compact sprocket without a hub projection.

Brand

Martin Sprocket

Model

50A112

$229.31 Each

Free Shipping orders over $100

#262732

Martin 50BS20 7/8 Type B Finished Bore roller chain sprocket for #50 chain (5/8" pitch), 20 teeth, 7/8" finished bore with keyway and setscrews, 4.321" outside diameter. Steel construction for power transmission drives. Single-strand, one-hub design for standard re-boring or finished bore applications.

Brand

Martin Sprocket

Model

50BS20 7/8

$60.15 Each

Free shipping

Recently Viewed

#5704308

Allen-Bradley 440N-G02094 Ferrogard FRS 2 non-contact safety interlock switch from Bulletin 440N. Operates on 24V DC with a magnetic actuator and IP67-rated enclosure for dust and water immersion protection. Designed for guard door monitoring and access control in industrial machinery requiring Category 1 performance.

Brand	Allen Bradley
Model	440N-G02094

$465.00 Each

Free Shipping orders over $100

#949722

Hubbell SFBGGY Snap-Fit BNC connector with gold-plated female-to-female contacts for 75 Ohm applications. Snap-fit design ensures quick, secure connections. Gray housing for easy identification. Suitable for commercial and industrial wiring installations.

Brand	Hubbell Wiring
Model	SFBGGY

$22.00 Each

Free shipping

#5738919

Allen-Bradley 600-TQX4 Bulletin 600 manual starting switch for manual motor control in starting and stopping applications. Rugged construction for industrial environments and reliable switching operation. Designed for use in motor control circuits where manual operation is required.

Brand	Allen Bradley
Model	600-TQX4

$138.00 Each

Free Shipping orders over $100

#5109760

Timken LSE715BRHSFS split cylindrical roller bearing housed unit assembly in a 4-bolt pillow block configuration. Split housing design simplifies installation and maintenance on industrial machinery. Cylindrical roller bearing insert provides high radial load capacity for applications with minimal axial loads, such as gearboxes, conveyors, or industrial fans requiring precise shaft alignment.

Brand	Timken
Model	LSE715BRHSFS

$20,699.83 Each

Free Shipping orders over $100

#5727283

Allen-Bradley 1606-XLE120EE Bulletin 1606 switched-mode power supply delivers 24V DC at 5A (120W) output. This DIN rail-mount unit accepts a wide-range 85-264V AC input (47-63 Hz) and features a compact design for industrial control panels. Built-in protection against overload, short circuit, and overvoltage ensures reliable operation in automation systems.

Brand	Allen Bradley
Model	1606-XLE120EE

$336.00 Each

Free Shipping orders over $100

Reviews

SKU: 250096

Durable and high quality

I bought a second one to keep as a spare, but the first one still hasn’t shown any signs of wear. Seems like a quality part.

SKU: 251157

21 tooth 12 dp spur gear

The 21 tooth 12 DP gear I bought arrived very quickly. It was exactly what I needed to fix my RV slide out. I had to machine it to fit, but I knew that when I ordered it. VERY SATISFIED!!!

SKU: 264057

Great service and selection

I was very pleased to find this on the shelf. The price was fair, and the delivery was prompt. I will do business again with MRO

SKU: 263484

Solid product at a great price

Solid product, fair and super fast shipping! MROSUPPLY delivers it all!

Return policy