Description
40B21 Roller Chain Sprocket, #40 Chain, 21 Teeth, B Hub
The 40B21 is a 21-tooth sprocket for ANSI #40 roller chain with a B style hub, machined from steel. Machined from solid stock, never sintered or powdered metal, which matters on sprockets where tooth wear sets the replacement interval.
$50 minimum order on drive components. Mix and match any pulleys, bushings, sheaves, sprockets, and accessories in your cart to reach the $50 minimum. Questions? Call (888) 203-2358.
Specifications
| Specification | Value |
|---|---|
| Part Number | 40B21 |
| Chain Size | ANSI #40 |
| Teeth | 21 |
| Hub Style | B |
| Strands | 1 |
| Outside Diameter | 3.617 in |
| Pitch Diameter | 3.355 in |
| Bore | 5/8 in minimum plain bore |
| Maximum Bore | 1.875 in |
| Material | Steel (no sintered or powdered metal) |
| Weight | 1.73 lb |
| Country of Origin | China |
Applications
- Roller chain drives on conveyors and material handling equipment
- Agricultural machinery and implement drives
- Packaging machinery and light industrial drives
Chain Compatibility
ANSI #40 is a standardized roller chain size, so the 40B21 runs #40 chain from any manufacturer in the same pitch.
Cross Reference
The 40B21 interchanges with these equivalent part numbers, per published manufacturer interchange data:
| Manufacturer | Equivalent Part Number |
|---|---|
| Dodge® | 105035 |
| Martin | 40B21 |
| US Tsubaki | 40B21 |
| Regal Rexnord (Browning®) | 40B21 |
| Ametric | 40B21 |
| McMaster-Carr | 2590K36 |
| Powerdrive | 40B21 |
Always verify dimensions and bore size before substituting part numbers across manufacturers.
Buying in bulk? Save on volume.
Multi-unit and OEM quantities qualify for volume discounts. Call or email for a quantity quote.
Frequently Asked Questions
What chain does the 40B21 sprocket run?
ANSI #40 roller chain. The size is standardized, so #40 chain from any manufacturer fits.
Does the 40B21 replace the Dodge 105035?
Yes. Published interchange data crosses the 40B21 directly to the Dodge 105035, as well as Martin 40B21, US Tsubaki 40B21, Regal Rexnord 40B21. Verify dimensions and bore before ordering.
Does the 40B21 ship from Houston?
Yes. Stock items ship same day from our Houston, Texas warehouse. Call (888) 203-2358 to confirm availability.
All third-party part numbers and trademarks referenced are the property of their respective owners. References are for compatibility identification only and do not imply affiliation or endorsement.
Payment & Security
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.