Description
Stainless Steel Sprockets
SUS25B
Precision-machined No.25 chain stainless steel sprockets from Hangzhou Ever-Power — a factory-direct replacement for Tsubaki, Rexnord, and Martin compatible ANSI 25 sprocket assemblies.
Product Overview
The SUS25B is a miniature-pitch stainless steel sprocket designed to pair with ANSI No.25 roller chain. With a 6.35 mm pitch and stainless steel 304 construction, it serves compact drive systems found in food processing equipment, laboratory automation, pharmaceutical machinery, and light packaging lines. The SUS25B range covers tooth counts from 10T to 32T, offering designers a wide gear ratio spread within a small physical envelope.
At Hangzhou Ever-Power, every SUS25B sprocket is hobbed on CNC gear machinery to ensure accurate pitch-to-pitch spacing and uniform tooth flank geometry. The result is quieter operation, reduced chain wear, and a longer service interval compared to stamped or cast alternatives. Custom bore sizes and keyways are available to order with short lead times from our Hangzhou factory.
Full Dimensional Specifications
The table below covers all standard tooth counts available in the SUS25B series. Bore dimensions are shown for stock bore and maximum rebored sizes. All dimensions in millimetres.
| Chain: No.25SS | Pitch (P): 6.35 mm | Int. Width (W): 3.18 mm | Roller Dia. (Dr): 3.30 mm | Teeth Width (T): 2.8 mm | ||||||||
|---|---|---|---|---|---|---|---|---|
| Teeth No. | Outside Dia. Do (mm) | Pitch Dia. Dp (mm) | Bore Stock (mm) | Bore Min (mm) | Bore Max (mm) | Hub BD (mm) | Hub BL (mm) | Weight (kg) |
| 10 | 23 | 20.55 | 6 | 8 | 8 | 13 | 14 | 0.01 |
| 11 | 25 | 22.54 | 6 | 8 | 8 | 15 | 14 | 0.02 |
| 12 | 28 | 24.53 | 8 | 10 | 10 | 17 | 14 | 0.02 |
| 13 | 30 | 26.53 | 8 | 10 | 10 | 18 | 14 | 0.03 |
| 14 | 32 | 28.54 | 8 | 10 | 10 | 19 | 14 | 0.03 |
| 15 | 34 | 30.54 | 8 | 10 | 10 | 20 | 14 | 0.04 |
| 16 | 36 | 32.55 | 8 | 10 | 11 | 21 | 16 | 0.06 |
| 17 | 38 | 34.56 | 8 | 10 | 11 | 23 | 16 | 0.06 |
| 18 | 40 | 36.57 | 8 | 10 | 12 | 25 | 16 | 0.07 |
| 19 | 42 | 38.58 | 8 | 10 | 14 | 26 | 16 | 0.08 |
| 20 | 44 | 40.59 | 8 | 10 | 16 | 28 | 16 | 0.09 |
| 21 | 46 | 42.61 | 8 | 10 | 16 | 30 | 18 | 0.11 |
| 22 | 48 | 44.62 | 8 | 10 | 16 | 30 | 18 | 0.11 |
| 23 | 50 | 46.63 | 8 | 10 | 16 | 30 | 18 | 0.11 |
| 24 | 52 | 48.65 | 8 | 10 | 16 | 30 | 18 | 0.12 |
| 25 | 54 | 50.66 | 8 | 10 | 16 | 30 | 18 | 0.12 |
| 26 | 56 | 52.68 | 10 | 12 | 16 | 30 | 18 | 0.12 |
| 27 | 58 | 54.7 | 10 | 12 | 16 | 30 | 18 | 0.13 |
| 28 | 60 | 56.71 | 10 | 12 | 16 | 30 | 18 | 0.13 |
| 30 | 64 | 60.75 | 10 | 12 | 16 | 30 | 18 | 0.14 |
| 32 | 68 | 64.78 | 10 | 12 | 16 | 30 | 18 | 0.15 |
Key Performance Advantages
CNC hobbing holds pitch tolerance within DIN quality grade 8, ensuring smooth engagement and minimal vibration even at elevated chain speeds.
Full SUS304 body resists corrosion from wash-down chemicals, steam, and mild acids — critical in food, pharma, and marine environments.
Precise tooth-flank geometry reduces roller-impact noise compared to rougher-machined alternatives, suitable for noise-sensitive environments.
Stock bore fits standard shaft sizes. Reboring with keyway, set-screw, or taper-lock preparation is available with 5–10 day lead time.
10T to 32T selection covers most compact drive ratio requirements without sourcing from multiple suppliers.
Minimum order from 10 pieces per size for custom-bore versions. Stock bore items available as single-piece samples for engineering validation.
Typical Applications
No.25 chain and the SUS25B sprocket are a favoured combination wherever space constraints demand a small-pitch drive with reliable corrosion resistance. Common installation environments include:
Compatible Components & Related Products
A sprocket is only as good as the chain it runs with. Ever-Power supplies a complete range of components that pair directly with the SUS25B, so you can consolidate procurement and ensure dimensional compatibility across your drive assembly.
Full SUS304 simplex roller chain in 6.35 mm pitch. Supplied in 5 m, 10 m rolls or cut-to-length. Direct mate for all SUS25B sprockets.
Stainless steel master links for No.25 chain. Available in slip-fit and press-fit styles. Sold separately or in bulk packs of 50.
Stainless A2-70 parallel keys and socket-head set screws to complete the bore-to-shaft assembly. Multiple sizes in stock.
SUS25B teeth on pre-bored idler hubs with stainless bearing inserts — ready to mount on tensioning arms without additional machining.
Customer Reviews
“Ordered 200 pieces of SUS25B 18T for our bottling line rebuild. Dimensional accuracy was spot-on — no shimming needed at all. Delivery from Hangzhou to Hamburg in 9 days. Will reorder.”
“We’ve been replacing our Tsubaki No.25 sprockets with Ever-Power’s SUS25B for two years now. Same fit, noticeably better price. The corrosion resistance in our seafood processing plant has been excellent.”
“Good quality stainless sprockets for pharmaceutical conveyor project. Lead time on custom bore was 8 days which met our schedule. Minor packaging improvement would be welcome but the parts themselves are great.”
Frequently Asked Questions
Share your chain type, tooth count, bore size, and quantity. Our engineers will reply with pricing and lead time the same business day.
📍 SHENHUA ROAD, HANGZHOU, CHINA · 📞 +86-571-88220653
