Product Overview

#25 Stainless Steel Sprockets are precision-manufactured for ANSI No.25 roller chain running on a 1/4-inch (6.35 mm) pitch — the smallest and lightest standard ANSI chain pitch in widespread industrial use. Compact, corrosion-resistant, and available in 9 through 60 teeth, this range covers virtually every drive-ratio requirement that arises in fine-pitch conveying, instrumentation, and light-duty automation equipment. Produced at our Hangzhou facility from 304-grade stainless steel, these sprockets serve as direct-fit replacements for equivalent components from Rexnord, Tsubaki, Martin, and Browning, supplied factory-direct without the distribution premiums that those brands carry when sourced through North American or European channels.

The No.25 chain pitch occupies a unique position in the ANSI chain family: small enough to keep sprocket outside diameters well under 5 inches even at 60 teeth, yet standard enough that replacement chain and connecting hardware is universally available. This makes #25 stainless sprockets the first choice for small-format food-processing conveyors, medical-device handling equipment, laboratory automation, and any application where a stainless-steel power-transmission component must fit into a very tight space.

All sprockets in this series are machined to ANSI B29.1 tooth form tolerances. Hub bores are finished to standard dimensions for direct shaft mounting. Custom bore and keyway machining is available as a value-added service with 5–10 working day lead times from our Hangzhou CNC department.

Chain Parameters & Dimensional Specifications

Complete dimensional data for all standard tooth counts. Outside diameter, stock bore, maximum bore, hub diameter, hub length, and weight are listed for each tooth count. All dimensions in inches.

Material & Manufacturing Standards

Every #25 stainless steel sprocket starts as a 304-grade stainless bar or forged blank — material grade confirmed by mill certificate before production release. The tooth form is CNC-hobbed to ANSI B29.1 specifications, which define the seating curve radius, tooth approach angle, and tip relief that govern smooth roller engagement at fine-pitch chain speeds. Because No.25 chain runs at higher rotational speeds than larger-pitch chains for a given conveying velocity, dimensional accuracy at the tooth level has a proportionally larger effect on vibration and noise than it would on a coarser-pitch drive.

After hobbing, all stainless parts undergo acid passivation to ASTM A967. This step removes iron contamination introduced by the cutting tools and restores the passive chromium-oxide surface layer that gives 304 stainless its corrosion resistance. The result is a sprocket that will not rust in wash-down, steam, or mildly acidic environments, and will not shed iron particles onto the product being conveyed — a critical requirement in food, pharmaceutical, and medical-device manufacturing.

Where #25 Stainless Steel Sprockets Are Used

The fine pitch and compact dimensions of No.25 chain and sprockets make this combination the natural choice for machinery categories where both size and corrosion resistance matter simultaneously. The following application types represent the primary current uses of our #25 SS sprocket range.

Matching Components & Chain Drive Accessories

A complete No.25 stainless drive requires matched chain, connecting links, and tensioning hardware. We stock all items listed below and can consolidate them into a single shipment with your sprocket order — simplifying procurement and reducing freight costs compared to multi-supplier sourcing.

Why Source #25 Sprockets from Ever-Power?

The No.25 stainless steel sprocket market is dominated by a handful of established North American and Japanese brands — Rexnord, Martin, Tsubaki, Browning — that price their products through a multi-tier distribution network. When a machine builder or MRO buyer sources equivalent product factory-direct from Hangzhou Ever-Power, the per-unit price advantage over brand-name distributor pricing is typically 40–60%, with no sacrifice in dimensional accuracy or material quality. Our QC process, material documentation, and customer service infrastructure are designed to meet the expectations of industrial buyers who previously sourced exclusively from major brands.

Our production capacity for #25 stainless sprockets covers all standard tooth counts from 9T through 60T with short lead times. For machine builders placing annual blanket orders, we offer dedicated stock reservation and scheduled call-off programmes that eliminate the risk of supply disruptions. Contact our sales team to discuss a supply agreement tailored to your annual volume.

Customer Reviews

Ordering & Lead Times

Standard stock-bore #25 stainless sprockets ship within 3–5 business days for quantities up to 500 pieces. Custom bore, keyway, or non-catalogue tooth counts require 7–12 business days from drawing confirmation or sample receipt. Minimum order: 1 piece for stock items; 10 pieces per part number for custom configurations. Volume pricing is available from 100 pieces per SKU, and blanket-order agreements with scheduled call-offs can be arranged for annual-volume customers.

Frequently Asked Questions