Image for Illustration purposes only. Actual product may vary

Martin Sprocket 0003902R D50B24 ALT SPK ROLLER DOUBLE B HARDEN TEETH 1 15/16" BORE (1.9375/1.9395) 1/2" X 1/4" STD KEYWAY (2) 1/2-13 UNC SET SCREWS

MODEL 0003902R

BRAND

Martin Sprocket

SKU

95772514

WEIGHT

1.750 lb

UOM

each

Not Returnable This item is made to order.

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

$289.27 Each

Prices are subject to change

FREE SHIPPING ON ORDERS OVER $100

Select Quantity

GET A QUOTE

Returnable:No

Type B Multi-Strand Sprockets The Martin Sprocket 0003902R D50B24 ALT SPK ROLLER is a high-performance Type B multi-strand sprocket designed for optimal power transmission and durability in demanding industrial applications. Engineered with precision, this sprocket features hardened teeth to enhance longevity and reliability under heavy loads.

Key Features

Construction	Double B roller design with hardened teeth ensures high wear resistance and extended service life.
Bore Dimensions	Fits a bore size of 1 15/16" (1.9375"/1.9395") for versatile compatibility with various setups.
Keyway	Standard 1/2" x 1/4" keyway facilitates secure mounting and alignment.
Set Screws	Equipped with two 1/2-13 UNC set screws for enhanced retention and stability during operation.
Material Quality	Manufactured from high-grade materials that meet stringent industry standards for reliability.

Applications

Industrial Machinery	Ideal for use in conveyor systems, material handling equipment, and other machinery requiring robust power transmission solutions.
Compatibility	Compatible with various chain types, making it suitable for diverse operational environments.
Heavy-Duty Use	Designed to withstand the rigors of heavy-duty applications, ensuring dependable performance in challenging conditions.

Benefits

Enhanced Durability	Hardened teeth resist wear, reducing maintenance frequency and downtime.
Reliable Performance	Precision engineering ensures optimal power transfer and efficiency, contributing to improved operational productivity.
Versatile Installation	The standard keyway and set screws allow for easy installation and secure fit across various applications. --- Product information compiled with AI assistance for reference purposes.

How do I read a Martin roller chain sprocket part number like D160B16H 2 1/4? This product

Martin numbers read left to right. The prefix is the strand count: none single, D double, E triple, F quadruple, DS double single. Next is the chain number, the pitch in eighths of an inch for ANSI chain (80 is 1"); metric sprockets use the ISO number (08B, 16B), double pitch a 20 prefix (2040, 2060). Then the type: A plate only, B hub one side, C hubs both sides, D detachable hub, BS bored to size, BTB taper bushed, a QD or MST code, or BB, NB, BR idlers. Then tooth count, H hardened teeth or SS stainless, and the bore. So D160B16H 2 1/4 is a double No. 160, Type B, 16 hardened teeth, 2-1/4" bore.

What is the difference between Martin BTB, QD and MST bushed sprockets, and can I swap bushings between them? This product

Martin makes bushed sprockets for three bushing systems. BTB sprockets take TB (taper bushed) bushings sized by number, such as 1610 or 2517. QD sprockets take QD bushings coded JA, SH, SDS, SD, SK, SF, E, F, J, M, N, P, W and S. MST (Martin Split Taper) sprockets take bushings coded G, H, P1 to P3, Q1 to Q3, R1, R2, S1, S2, U0 to U2, W1 and W2; for example 100R45 uses an R1 bushing. Martin states the styles are not interchangeable with each other, but each one is interchangeable with the same style from other manufacturers. Match the bushing style and size on the sprocket before ordering.

When should I use a Martin hardened tooth sprocket? This product

Martin marks hardened tooth sprockets with an H suffix after the tooth count, for example D35B19H; the bored to size tables use HT, as in 40BS12HT. Martin recommends hardened teeth on the smaller sprocket of a roller chain drive when the ratio is 4:1 or greater, or when the small sprocket has 24 teeth or fewer and runs above 600 RPM, because hardened teeth give longer chain and sprocket life. Some stock lines are hardened as standard: triple No. 35 stock sprockets with 25 teeth or fewer, and all Martin needle bearing idlers. Hardened versions are listed across plain bore, bored to size, taper bushed and MST sprockets in our Martin range.

What is the difference between a Martin stock bore (MPB) sprocket and a BS bored-to-size sprocket? This product

Stock bore sprockets, shown on our listings as MPB (minimum plain bore), have a small plain bore for reboring to your shaft. Martin lists a recommended maximum bore for each, sized to leave room for a standard keyseat with a setscrew over it; slightly larger bores are possible with no keyseat or a shallow one. BS sprockets are finished at the factory to a listed shaft size with a keyway on the center line of a tooth and two setscrews; the smallest bores (3/8" and 1/2" on No. 35 and No. 40) get setscrews only, no keyway. For example, 40BS60 1 1/2 is a No. 40, 60 tooth sprocket with a 1-1/2" finished bore.

Which Martin idler sprocket do I need: BB, NB or BR? This product

Martin codes idler sprockets by bearing type. BB is a ball bearing idler, normally with hardened steel teeth (35BB19H 1/2); an NM suffix means non-metallic teeth (40BB17NM 1/2). NB is a needle bearing idler with hardened teeth (80NB13H 1). BR is a bronze bearing idler, with a grease groove on the 7/8" and 1-1/8" bores (60BR15 7/8). Martin publishes radial load capacities for ball and needle bearing idlers based on 2,500 hours average bearing life: a 3/4" bore ball bearing idler is rated 600 lb at 1,000 RPM, a 1" bore needle bearing idler 1,379 lb. Sintered bronze bushed idlers are rated to 2,500 RPM and 50 lb. Select by chain size, bore and load.