SIZE REFERENCE / YZEFY SPROCKETS
40 sprockets
40 sprockets are selected for industrial transmission, packaging, conveyors, agricultural machinery and OEM drives. The #40 chain reference identifies the mating chain family, but it does not finish the sprocket specification. Confirm strand, number of teeth, bore, keyway, hub and available axial space before ordering. #40 is a common ANSI reference, but the sprocket still has to match strand arrangement, teeth, shaft interface and the actual chain dimensions.
A standard request can start with the chain marking and required tooth count. A custom or replacement request should also include a drawing, sample, measured existing sprocket or shaft information. The intended chain and shaft should be reviewed together.
Size reference
40 Sprockets
- SpecificationReference
- Chain referenceANSI #40
- Standard familyANSI / ASME B29.1
Quick Specifications
| Specification | Reference |
|---|---|
| Chain reference | ANSI #40 |
| Standard family | ANSI / ASME B29.1 |
| Pitch | 12.700 mm |
| Roller diameter | 7.920 mm |
| Inner width | 7.950 mm |
| Strand | Simplex, duplex or triplex, stated in the complete chain designation |
| Sprocket forms | Type A plate, Type B hub, Type C double hub and drawing-defined forms |
| Bore and hub | Pilot or finished bore, keyway, bushing or custom shaft interface |
Chain & Size Reference
The values below identify the mating chain. They are not finished sprocket dimensions. Pitch diameter, outside diameter, tooth width, bore and hub dimensions depend on the selected tooth count, strand arrangement and machine drawing.
| Chain | Pitch (mm) | Roller diameter (mm) | Inner width (mm) |
|---|---|---|---|
| #40 | 12.700 | 7.920 | 7.950 |
Simplex / Duplex / Triplex
A simplex sprocket carries one chain row. Duplex and triplex versions carry two or three rows and use different transverse spacing and total tooth width. State the complete suffix with the #40 reference. The base number alone is not enough to select a multi-strand sprocket.
Available Sprocket Configurations
- Type A plate sprockets for compact layouts or separate-hub assemblies.
- Type B sprockets with a hub on one side.
- Type C sprockets with hubs on both sides or a wider shaft interface.
- Idler, split, weld-on, bushing-mounted and other forms defined by the drawing.
Do not assign a tooth count from the chain size alone. Confirm the required driver and driven teeth in the RFQ or drawing.
Materials
Carbon steel is used for many general industrial drives. Alloy steel can be considered for higher load, shock or wear requirements. Stainless steel suits corrosion, washdown and cleaning exposure. Cast iron, aluminum and engineering plastics may fit specific low-load or weight-sensitive designs. State the material grade, supply condition and certificate requirement in the RFQ.
Heat Treatment & Surface Treatment
Tooth hardening, induction hardening or carburizing may be specified when the drawing or application requires greater tooth wear resistance. Protective surface treatment can be considered for corrosion, storage or washdown conditions. Include hardness, case depth, treated area, surface finish and inspection method when those values are controlled by the purchase specification.
Custom #40 Sprockets
Send the chain reference, number of teeth, strand, bore, keyway, hub dimensions and quantity. Add the material, heat treatment, surface treatment, tolerances, marking and inspection requirements from the drawing. For sample-based work, include the chain marking, tooth count, pitch, roller diameter, inner width, face width and shaft measurements. Application speed, load, center distance and operating environment can resolve details that a worn sample cannot show.
Replacement Sprockets
A replacement #40 sprocket should be checked against the mating chain and shaft, not copied from worn tooth tips. Send the old chain marking, tooth count, bore, keyway, hub, face width, photos and any part number. If the failure involved chain elongation, poor alignment, inadequate lubrication or contamination, inspect the chain and mating sprocket before replacing one part.
Applications
#40 sprocket requests commonly come from industrial transmission, packaging, conveyors, agricultural machinery and OEM drives. The application helps define the review, but it does not choose the tooth count or shaft connection. Load, speed, chain line, environment and mounting space still belong in the specification.
Standard & Compatibility Notes
ANSI #40 is an ANSI chain reference within the ASME B29.1 product family. The chain dimensions in this page are used to identify the mating chain. A similar pitch in another standard does not prove interchangeability. Compare the roller or bush diameter, inner width, strand spacing, tooth form and shaft interface before approving a substitute.
How to Select
- Confirm the complete ANSI #40 chain reference and its standard family.
- State simplex, duplex or triplex and the complete strand suffix.
- Record driver and driven teeth, speed ratio, center distance and chain line.
- Check pitch, roller diameter, inner width and transverse spacing.
- Select Type A, Type B, Type C or another drawing-defined form.
- Specify bore, keyway, locking method, hub dimensions and axial clearance.
- Add material, treatment, finish, quantity, inspection and drawing revision.
- Send a sample or measured photo if any original dimension is uncertain.
FAQ
What does #40 identify?
It identifies a common ANSI chain size with a 12.700 mm pitch. It does not identify the sprocket tooth count or bore.
Can an ISO 08B sprocket replace a #40 sprocket?
Not from pitch alone. Compare roller diameter, inner width, strand spacing, tooth form and the mounting interface first.
What bore details are needed for a 40 sprocket?
Provide shaft diameter, keyway size and position, hub side, hub length and axial clearance.
Do you quote custom 40 sprockets?
A drawing, sample or measured part can start a review when it includes the mating chain and shaft information.
Request a Quote for #40 Sprockets
Send the chain reference, number of teeth, strand, bore, keyway, hub, quantity and application. For custom or replacement work, attach a drawing, sample photo, old sprocket dimensions or existing part number. The quote review can then cover both the chain engagement and shaft interface.