Product Overview

Stainless Steel Metric Sprockets cover the BS/DIN roller chain series that dominates European, Australian, South American, and Asian industrial markets outside North America — specifically chain designations 06B, 08B, 10B, 12B, and 16B, conforming to ISO 606 (British Standard BS 228 and DIN 8187). These standards define a metric tooth geometry and roller-engagement profile that differs meaningfully from ANSI B29.1 — a difference that makes BS/DIN sprockets and ANSI sprockets physically non-interchangeable despite some chains sharing the same pitch dimension.

At Hangzhou Ever-Power, our stainless metric sprocket range spans tooth counts from 12T to 30T across the five standard BS/DIN chain sizes, machined in 304-grade stainless steel to ISO 606 tooth-form tolerances at our Hangzhou CNC facility. This range provides a factory-direct stainless alternative to metric sprockets from Renold, Iwis, Tsubaki (European series), Rexnord, and SKF — brands whose metric-format stainless components carry significant distribution premiums when sourced through European distributors. Buyers in the EU, UK, Australia, Netherlands, Germany, and South Korea who specify BS/DIN chain on their machinery can source equivalent stainless metric sprockets factory-direct from Hangzhou at substantially lower per-unit cost.

The metric BS/DIN format also defines the dimensional column headers differently from ANSI catalogues. The key column labels in this range are: O (outside diameter), K (tip-circle diameter for chain clearance purposes), N (hub outer diameter), D (keyway width), B (bore diameter), and L (hub length). These labels correspond to standard ISO 606 dimensional reporting, which European machine builders will recognise immediately from their own technical documentation.

Understanding BS/DIN Metric Chain Standards

The BS (British Standard) and DIN (Deutsche Institut für Normung) roller chain standards were harmonised into ISO 606 in the 1990s, and today the terms BS, DIN, and ISO B-series are used interchangeably in most markets to describe the same chain and sprocket dimensional family. The key distinguishing feature is that BS/DIN chains use metric tooth and roller dimensions with a tooth profile calculated for those specific metric roller diameters — making the sprocket tooth geometry different from an ANSI sprocket of the same pitch even when the pitch dimension happens to coincide.

For procurement purposes, the key identifiers are the chain designation letters and numbers: 06B = 3/8-inch pitch BS chain; 08B = 1/2-inch pitch BS chain; 10B = 5/8-inch pitch BS chain; 12B = 3/4-inch pitch BS chain; 16B = 1-inch pitch BS chain. These are the same designations that will appear on equipment documentation, maintenance manuals, and replacement-part lists for European-designed machinery operating anywhere in the world.

No.06B Stainless Steel Metric Sprockets

All dimensions in millimetres. Columns: O = outside diameter, K = tip-circle diameter, N = hub outer diameter, D = keyway width, B = bore diameter, L = hub length.

No.08B Stainless Steel Metric Sprockets

No.08B is the most widely used BS/DIN chain size globally — equivalent in pitch to ANSI No.40 but with a different roller diameter, making sprockets non-interchangeable between the two standards.

No.10B Stainless Steel Metric Sprockets

No.10B shares pitch and roller diameter with ANSI No.50 chain but differs in inner width (9.65 mm vs 9.53 mm ANSI) and tooth form geometry. Always confirm BS or ANSI standard before ordering.

No.12B Stainless Steel Metric Sprockets

No.12B is widely used in European agricultural machinery, food-processing equipment, and industrial conveyors. It is the BS/DIN equivalent pitch to ANSI No.60, but with different roller geometry — sprockets are not interchangeable.

No.16B Stainless Steel Metric Sprockets

No.16B is the BS/DIN heavy-pitch standard, equivalent in pitch to ANSI No.80 and No.100 but with a distinct roller width. It is commonly specified on large European agricultural machines, heavy conveyors, and offshore equipment.

Material, Surface Treatment & ISO 606 Compliance

All metric stainless sprockets in this range are manufactured in 304-grade stainless steel conforming to EN 10088 / ASTM A276 chemical composition requirements. The tooth form is CNC-hobbed to the seating curve radius and approach angle defined by ISO 606 for each specific roller diameter — a critical detail that distinguishes correctly manufactured BS/DIN sprockets from ANSI sprockets that happen to share the same pitch. Supplying an ANSI-profile sprocket on a BS/DIN chain is a common sourcing error that produces rapid tooth wear and chain noise because the roller seats at the wrong geometry.

Our engineering team maintains separate CNC hobbing programmes for each of the five BS/DIN chain sizes, each qualified by first-article tooth-form inspection using optical comparator measurement of the seating curve radius, approach arc, and tip relief. This qualification step is performed at the start of every production batch rather than assumed from the previous run — ensuring that tooling wear does not produce out-of-tolerance tooth forms that pass visual inspection but fail in service.

After hobbing and bore machining, all 304 SS metric sprockets undergo acid passivation per ASTM A967. This treatment is particularly important for stainless components destined for food-processing, pharmaceutical, or marine environments in Europe, Australia, and other regions where supplier documentation requirements include evidence of correct passivation treatment for stainless steel components in contact with food or wash-down chemicals.

ANSI vs. BS/DIN — Why the Distinction Matters for Sourcing

One of the most common and costly errors in industrial sprocket sourcing is substituting an ANSI sprocket for a BS/DIN requirement, or vice versa, on the assumption that matching the pitch dimension is sufficient. It is not. The tooth profile differences between ANSI B29.1 and ISO 606 arise from differences in roller diameter between the two standards at the same pitch — and a mismatched tooth form produces measurably higher contact stresses, noise, and wear rates that shorten both chain and sprocket service life.

This table confirms that even when roller diameters coincide (10B/No.50 and 16B/No.80), the inner width and side-plate geometry differ — so the tooth form is still not identical between standards. If you are unsure which standard applies to your machine’s chain, share the chain markings or a photograph with our sales team and we will identify the correct sprocket specification before you order.

Where Stainless Steel Metric Sprockets Are Specified

Matching BS/DIN Chain & Drive Components

A complete BS/DIN stainless drive system requires matched chain, connecting links, and tensioner hardware. We stock all five BS/DIN chain sizes in 304 and 316 stainless grades and can supply complete drive kits — sprockets, chain cut to length, and connecting links — as a single consolidated shipment.

Factory-Direct BS/DIN Sprockets from Hangzhou

Sourcing BS/DIN metric stainless sprockets through European distributors typically means paying for the ISO 606 tooth-form expertise, local stock, and distributor margin that established brands like Renold, Iwis, and Tsubaki Europe offer. For buyers who need correct dimensions and material quality but do not need local distributor services — particularly OEM machine builders placing annual volumes and MRO operations with adequate planning lead time — sourcing factory-direct from Hangzhou Ever-Power delivers the same dimensional and material quality at a significantly lower per-unit cost.

Our export experience with BS/DIN metric sprockets covers the EU, UK, Australia, New Zealand, South Korea, the Netherlands, Germany, Brazil, and Canada. We understand the documentation requirements that regulated-industry buyers in these markets need — material certificates in English, dimensional reports referencing ISO 606 acceptance criteria, and passivation records suitable for food-grade supplier qualification programmes — and we provide this documentation as a standard part of every order without additional charges or delays.

Customer Reviews

Custom Options, Lead Times & Ordering

Standard bore metric stainless sprockets from the five BS/DIN sizes listed above ship within 4–7 business days. Custom bore and DIN 6885A keyway orders: 8–12 business days from drawing confirmation. Non-catalogue tooth counts within any of the five chain sizes: 10–14 business days after engineering review confirmation. MOQ: 1 piece (stock); 10 pieces (custom configurations). For each chain size, we can also supply duplex (two-strand) versions on request.

When ordering, please specify: chain size designation (06B, 08B, 10B, 12B, or 16B), tooth count, bore diameter in mm, keyway dimensions if required, material grade (304 SS standard; 316L available), and quantity. If you have a part number from a Renold, Iwis, Tsubaki, or Rexnord catalogue, share it with us and we will cross-reference to the correct Ever-Power equivalent before production begins.

Frequently Asked Questions