Product Overview

The ANSI No.40 roller chain at 1/2-inch pitch is the single most widely used standard chain size in North American industry, and the #40 Stainless Steel Sprocket series provides factory-direct stainless precision matching to this universal chain. Available in tooth counts from 10T through 60T, the range covers every standard drive ratio from the fastest conveyor return drives to the slowest, highest-torque speed-reduction configurations in general machinery, food equipment, and agricultural systems.

Manufactured in 304-grade stainless steel at our Hangzhou CNC facility, #40 SS sprockets are dimensioned to ANSI B29.1 and drop in directly as replacements for Tsubaki 40SS, Rexnord / Browning 40SS, Martin Sprocket 40SS, and equivalent Dodge/ABB stainless sprockets. Factory-direct sourcing from Ever-Power typically delivers a 40–60% per-unit cost saving versus buying through North American or European distributors, with equivalent dimensional accuracy and material quality backed by mill certificates and inspection records.

The 1/2-inch pitch of No.40 chain occupies the most favourable position in the ANSI chain family for general-purpose power transmission: large enough to handle significant torque and shock loads, small enough to fit comfortably in mid-sized machinery without demanding large sprocket diameters. This versatility explains why #40 stainless sprockets appear in more diverse application types than any other single chain size — from bottling-plant conveyors to grain-handling equipment, from pharmaceutical packaging lines to light-industrial automated assembly systems.

Complete Dimensional Specifications

All standard #40 SS configurations. Dimensions are in US customary units. Entries represent Type B (hubbed) sprockets unless otherwise stated. Custom configurations available on request.

Manufacturing & Material Details

Production of #40 SS sprockets follows the same five-stage process applied across the Ever-Power stainless sprocket range: certified 304 bar stock → CNC hobbing to ANSI B29.1 tooth form → bore finishing to standard dimensions → passivation per ASTM A967 → batch dimensional inspection. For the #40 range specifically, the 1/2-inch pitch and 0.312-inch roller diameter represent the hobbing target values that drive the most significant quality differences between suppliers: an undersized seating curve radius causes the roller to ride too high on the tooth, accelerating flank wear; an oversized approach angle allows the roller to impact hard on tooth entry, creating noise and shock loading.

Our CNC hobbing programme for #40 sprockets is maintained and verified quarterly against calibrated master gauges. Tooth-form inspection using optical comparator or CMM is performed on the first article from each production batch and on statistical samples thereafter. This practice, standard in precision gear manufacturing but often omitted in sprocket production, catches tooling wear before it generates out-of-tolerance parts — the invisible root cause of many “noisy sprocket” field complaints.

For buyers who need higher tooth-face hardness than 304 stainless can deliver, C45 carbon steel with high-frequency quench hardening (40–50 HRC on tooth flanks) is available across the full #40 range. This grade is specified for agricultural machinery, mining-support conveyors, and other applications where abrasive grit or heavy shock loads would erode a softer stainless tooth surface within a single season.

Application Sectors & Grade Selection Guide

Performance Features

Matching Components — Complete No.40 Drive Supply

We stock No.40 chain drive components alongside our sprocket range, enabling single-supplier consolidated ordering for complete drive systems or refurbishment kits.

Customer Reviews

Lead Times, MOQ & How to Order

Standard-bore #40 SS sprockets ship within 3–6 business days for quantities to 200 pieces. Custom bore, keyway, taper-lock, or non-standard tooth count orders require 8–12 business days from drawing confirmation or sample receipt. Minimum order quantity: 1 piece (stock bore); 10 pieces per part number (custom configuration). Annual supply agreements with blanket-order pricing are available for customers with predictable ongoing demand.

Frequently Asked Questions