Overview
The Martin 35BS15HT 5/8 is a single-strand roller chain sprocket engineered for precise power transmission in industrial machinery. This Type BS (bored-to-size) unit features a 5/8 inch bore diameter, 1.989 inch outside diameter, and is designed for #35 roller chain with 3/8 inch pitch and 15 teeth. The Type BS sprocket with hardened teeth includes two setscrews and a keyway, and is suitable for use with the series 35 chain with 3/8″ pitch.
Key Features
- Hardened teeth — ensures extended wear life and reliable meshing with #35 roller chain
- Bored-to-size construction — finished bore with keyway and dual setscrews for immediate installation
- Type BS hub design — robust single-strand configuration for standard power transmission duty
- ANSI-compliant — meets or exceeds ANSI standards
- Steel construction — durable carbon steel for industrial reliability
Technical Specifications
- Chain Size: #35 (3/8″ pitch)
- Number of Teeth: 15
- Bore Diameter: 5/8″ (finished)
- Outside Diameter: 1.989″
- Hub Diameter: 1.344″
- Hub Width: 0.75″ (length through bore)
- Keyway: 3/16″ × 3/32″
- Fasteners: 1/4-20 × 1/4″ setscrews (qty. 2)
- Material: Steel (hardened teeth)
- Weight: Approximately 0.25 lb
- Chain Row Width: 0.168″ nominal
Typical Applications
Chain-drive systems provide minimal slippage, a fixed ratio between rotating shafts, and versatility with many different chain attachments and sprocket material selections. The 35BS15HT is commonly used in conveyor systems, packaging machinery, small AC/DC motor drives, and compact industrial automation where space is limited and 15-tooth input or driven sprockets are required.
Compatibility & Replacements
Compatible With
- #35 single-strand roller chain (ANSI 35-1)
- Motors with 5/8″ shaft mounting (3/16″ keyway standard)
- Single-strand chain drive systems up to 30 HP at low speed
- Any machinery or drive system originally designed for Martin #35 sprockets
Replaces / Drop-In Replacement For
- Martin 35BS15 (standard equivalent without “HT” hardened designation)
- Other OEM #35 sprockets with 15 teeth, 5/8″ bore, 3/8″ pitch
- Equivalent competitor sprockets in the same bore and tooth count
Works With
- #35 roller chain (standard ANSI 35-1 simplex)
- Standard shaft keyways (metric or imperial)
- Coupled or rigid motor/transmission mounting
- Belt and chain drive systems requiring sprocket-based speed reduction or multiplication
