Description
Stainless Steel Sprockets
SUS40B
The world’s most widely used chain pitch in stainless steel — SUS40B sprockets deliver the load capacity of the 40-series with full corrosion immunity for food, pharma, and process-industry drives.
SUS40B in the Industrial Drive Chain Family
The 12.7 mm pitch — half an inch exactly — is the single most common chain pitch in global industrial machinery. The No.40SS chain that mates with the SUS40B sprocket shares this pitch with the widely adopted ANSI #40 standard, and as a result the SUS40B sits at the centre of the stainless steel roller chain sprocket market. Machinery built to North American, European, and Asian standards alike uses this pitch class, which means SUS40B sprockets appear across an exceptionally broad range of equipment types: from food processing conveyors and pharmaceutical packaging lines through to chemical plant transfer systems, printing machinery, and general industrial automation cells. The SUS40B designation follows the same naming logic as the broader SUS series — “SUS” for 304 stainless steel, “40B” for the 12.7 mm pitch class.
What makes this pitch class particularly significant from a maintenance standpoint is the sheer volume of replacement demand it generates. Because No.40SS chain is installed in more machines worldwide than any other stainless chain pitch, the need for accurate, reliable SUS40B replacement sprockets is constant. Dimensional conformity with the original specification is critical: a replacement sprocket carrying even a small accumulated pitch error will accelerate chain wear from the first hours of service. Hangzhou Ever-Power manufactures SUS40B sprockets to the same dimensional standards as OEM-fitted parts, ensuring that replacement installations perform identically to the original drive design throughout the service interval.
Our SUS40B range covers 26 tooth counts from 10T through 40T, produced from solid 304 stainless bar stock with CNC-hobbed tooth profiles and H7-tolerance bores as standard. Simplex (single-strand) is the catalogue configuration; duplex and triplex are available to order. Custom bore, keyway, hub geometry, and non-standard tooth counts are produced from customer drawings with no minimum order restriction.
Chain Parameters & Complete Dimensional Specifications
Four chain parameters define every aspect of SUS40B tooth geometry. The identical roller diameter and internal width values — both 7.95 mm — are characteristic of the No.40SS chain family and distinguish it from other pitch classes. These parameters are fixed inputs to the tooth profile calculation; holding them accurately across the full 26-size production range is what ensures every SUS40B sprocket engages the chain consistently from the first link in service to the last.
Complete SUS40B Dimensional Table — All 26 Sizes
| Type | Teeth | OD Do (mm) | PCD Dp (mm) | Stock Bore | Min. Bore | Max. Bore | Hub BD | Hub BL | Wt. (kg) |
|---|---|---|---|---|---|---|---|---|---|
| SUS 40B | 10 | 46 | 41.10 | 9.8 | 11.8 | 18 | 32 | 22 | 0.14 |
| SUS 40B | 11 | 51 | 45.08 | 10.8 | 12.8 | 20 | 36 | 22 | 0.19 |
| SUS 40B | 12 | 55 | 49.07 | 10.8 | 12.8 | 22 | 40 | 22 | 0.22 |
| SUS 40B | 13 | 59 | 53.07 | 13.5 | 15.5 | 20 | 37 | 22 | 0.23 |
| SUS 40B | 14 | 63 | 57.07 | 13.5 | 15.5 | 25 | 42 | 22 | 0.28 |
| SUS 40B | 15 | 67 | 61.08 | 13.5 | 15.5 | 28 | 46 | 22 | 0.34 |
| SUS 40B | 16 | 71 | 65.10 | 13.5 | 15.5 | 30 | 50 | 22 | 0.40 |
| SUS 40B | 17 | 76 | 69.12 | 13.5 | 15.5 | 32 | 54 | 22 | 0.46 |
| SUS 40B | 18 | 80 | 73.14 | 13.5 | 15.5 | 35 | 57 | 22 | 0.51 |
| SUS 40B | 19 | 84 | 77.16 | 13.5 | 15.5 | 40 | 62 | 22 | 0.59 |
| SUS 40B | 20 | 88 | 81.18 | 14.5 | 16.5 | 45 | 67 | 25 | 0.76 |
| SUS 40B | 21 | 92 | 85.21 | 14.5 | 16.5 | 48 | 71 | 25 | 0.85 |
| SUS 40B | 22 | 96 | 89.24 | 14.5 | 16.5 | 51 | 75 | 25 | 0.95 |
| SUS 40B | 23 | 100 | 93.27 | 14.5 | 16.5 | 51 | 77 | 25 | 1.00 |
| SUS 40B | 24 | 104 | 97.30 | 14.5 | 16.5 | 42 | 63 | 25 | 0.84 |
| SUS 40B | 25 | 108 | 101.33 | 14.5 | 16.5 | 42 | 63 | 25 | 0.88 |
| SUS 40B | 26 | 112 | 105.36 | 14.5 | 16.5 | 42 | 63 | 25 | 0.92 |
| SUS 40B | 27 | 116 | 109.40 | 14.5 | 16.5 | 42 | 63 | 25 | 0.96 |
| SUS 40B | 28 | 120 | 113.43 | 14.5 | 16.5 | 42 | 63 | 25 | 1.00 |
| SUS 40B | 30 | 128 | 121.50 | 14.5 | 16.5 | 42 | 63 | 25 | 1.10 |
| SUS 40B | 32 | 137 | 129.57 | 14.5 | 16.5 | 45 | 68 | 28 | 1.30 |
| SUS 40B | 34 | 145 | 137.64 | 14.5 | 16.5 | 45 | 68 | 28 | 1.30 |
| SUS 40B | 35 | 149 | 141.68 | 14.5 | 16.5 | 45 | 68 | 28 | 1.40 |
| SUS 40B | 36 | 153 | 145.72 | 14.5 | 16.5 | 45 | 68 | 28 | 1.50 |
| SUS 40B | 38 | 161 | 153.79 | 14.5 | 16.5 | 45 | 68 | 28 | 1.60 |
| SUS 40B | 40 | 169 | 161.87 | 16.5 | 18.5 | 45 | 68 | 28 | 1.70 |
SUS40B vs ANSI #40: Understanding the Relationship
Engineers familiar with the ANSI roller chain #40 standard will notice that the SUS40B shares its 12.7 mm pitch and 7.95 mm roller diameter. This alignment is intentional: the metric “B” series and the ANSI inch series converge at the half-inch pitch class, and the tooth geometry required to engage either chain family is functionally the same. In practice, a correctly dimensioned SUS40B sprocket will engage standard ANSI #40 chain, and ANSI #40 sprockets will engage No.40SS chain — provided the tooth width falls within the chain’s inner link clearance. This cross-compatibility is valuable for operators who run mixed-standard equipment on the same production floor.
The practical difference between the two standards lies in material and surface treatment, not geometry. ANSI #40 sprockets are most commonly supplied in carbon steel with induction-hardened teeth — maximizing wear life in dry, well-lubricated industrial environments. The SUS40B trades some of that tooth hardness for full stainless construction, making it the right choice wherever carbon steel would corrode, stain, or fail hygiene requirements. For applications where both corrosion resistance and elevated tooth hardness are needed simultaneously, consult our team about available options.
Precision Manufacturing — From Bar Stock to Finished Sprocket
At the 12.7 mm pitch scale, the SUS40B occupies the boundary between light and medium industrial duty. Parts in this size range have enough mass that dimensional errors, if present, create measurable force imbalances during operation — elevated vibration, uneven load distribution across the tooth face, and accelerated fatigue at the bore-to-shaft interface. Our manufacturing sequence addresses each of these failure modes through process controls at every machining stage.
Performance Characteristics of the SUS40B
Understanding what the SUS40B does well — and where its operating limits lie — helps maintenance engineers and procurement teams make the right specification decision the first time. The four performance characteristics below represent the most commonly evaluated criteria for a chain sprocket wholesale purchase at this pitch class, and the values listed reflect the as-machined 304 stainless condition without any additional heat treatment.
Corrosion Resistance
Self-passivating 304 stainless resists most acids, alkalis, and humidity. No protective coating required. Surface regenerates after each cleaning cycle.
Tensile Strength
Adequate for the load range of No.40SS chain drives in food, pharma, and light industrial applications. Exceeds the tensile demand at rated chain capacity.
Temperature Range
304 stainless maintains its passive film and mechanical properties across this range, covering cold-store conveying, ambient, and steam-process environments.
Noise & Vibration
CNC-hobbed tooth profiles minimize polygonal action. Using ≥ 17 teeth on the small sprocket further reduces impact noise at moderate chain speeds.
Where SUS40B Sprockets Are Installed
Because the 12.7 mm pitch is the global default for medium-duty chain drives, SUS40B sprockets appear in an unusually diverse collection of machinery types. The thread connecting all these applications is the need for a drive component that performs reliably in a humid, wet, or chemically active environment without the maintenance burden that carbon steel would impose. The sectors below represent the primary installation bases for this sprocket series.
🏭
Food Processing Conveyors
Meat slicing lines, vegetable processing cells, bakery transfer conveyors, and frozen food packaging systems all rely on No.40SS chain drives that can tolerate daily hot caustic washdown. SUS40B sprockets run through these cycles without rust formation, keeping production lines compliant with HACCP and BRC hygiene standards throughout the equipment service life.
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Beverage & Liquid Filling
High-speed can and bottle filling lines, pasteurization tunnels, and carbonated drink packaging equipment depend on chain drives that handle steam, condensate, and rinse water continuously. SUS40B sprockets deliver the same pitch-class performance as carbon steel equivalents in these zones without the corrosion maintenance cycles that would interrupt production.
💊
Pharmaceutical Production
GMP-regulated solid-dose and liquid-fill lines require drive components that do not contaminate the production environment. SUS40B sprockets meet GMP material requirements, tolerate IPA and peroxide-based sanitation, and can be supplied electropolished for cleanroom-class Ra surface finish requirements in classified manufacturing areas.
🧪
Chemical Process Equipment
Pump drives, agitator couplings, and conveyor systems in chemical plants handle acidic vapors, caustic splashes, and solvent exposure that would strip protective coatings from carbon steel within a production season. Stainless construction removes this failure mode entirely, supporting longer planned maintenance intervals and reduced unscheduled downtime.
📦
Packaging & Cartoning Machinery
Horizontal flow-wrappers, vertical form-fill-seal machines, and cartoning equipment use No.40SS chain for product indexing and carton transport. Machinery builders who export to food-sector customers increasingly specify stainless chain drives as standard rather than option, and SUS40B sprockets from Hangzhou Ever-Power are dimensionally matched to their OEM requirements for direct fitment.
🌿
Outdoor & Agricultural Machinery
Irrigation controllers, greenhouse automation systems, and outdoor material handling equipment face persistent exposure to rain, fertilizer, and soil moisture. SUS40B sprockets eliminate the rust-and-seize failures that commonly ground carbon steel chain drives in these environments, reducing field service calls and extending the productive life of remote machinery installations.
Ordering Options & Custom Configurations
Standard SUS40B orders — specifying a tooth count from the table, a bore diameter within the listed range, and quantity — are processed from our production schedule with a typical turnaround of 3–7 business days for common sizes. For configurations outside the standard table, or for duplex and triplex strand versions, the process begins with a drawing or written specification and proceeds through a quoted approval before production starts. There is no minimum order quantity for any SUS40B variant.
📋 Standard Catalogue Order
Select any tooth count from 10T–40T, specify bore diameter within the catalogue range, and provide quantity. Keyway or set-screw can be added to a catalogue bore at no tooling charge for DIN 6885 standard key sizes. Lead time: 3–7 business days.
🔗 Duplex / Triplex Strand
Double or triple tooth face width for multi-strand No.40SS chain. Specify strand count, tooth count, bore, and hub length. Both tooth rows are hobbed to the same pitch tolerance as simplex versions. Lead time: 7–14 business days from order confirmation.
📐 Custom Drawing / OEM
Non-standard teeth counts, hub geometries, split-sprocket designs, or reverse-engineered replacements produced from customer DXF/PDF drawings or physical samples. Drawing approval before production. First-article inspection report included. Lead time: 7–14 business days for first article.
Why Choose Hangzhou Ever-Power for SUS40B Sprockets
At the 12.7 mm pitch class, dimensional conformity between replacement and original equipment sprockets is non-negotiable. We stake our repeat order rate on delivering parts that match their drawings exactly — every batch, every tooth count, every bore size.
stainless sprockets
counts in range
standard on all parts
for standard sizes
Bar stock to finished, marked, and packed sprocket — all in one facility. No subcontract machining, no split quality responsibility, no communication gaps between suppliers.
Mill test certificates confirming chemical composition and heat number traceability are available on request for food, pharma, and other regulated procurement categories.
All export paperwork — commercial invoice, packing list, certificate of origin, and shipping marks — prepared in-house in English for smooth customs clearance in any destination market.
Technical queries go directly to production engineers, not through a call-centre. Bore sizing questions, duplex load calculations, and reverse engineering assessments are answered from first-hand production knowledge.
Frequently Asked Questions
Common questions about SUS40B stainless steel sprockets.
