SIZE REFERENCE / YZEFY SPROCKETS
08A sprockets
08A sprockets are selected for industrial transmission, packaging lines, conveyors and international OEM equipment. The 08A designation identifies the ISO 606 A-series chain family, but it does not finish the sprocket specification. Confirm strand, teeth, bore, keyway, hub and available axial space before ordering. 08A shares a nominal pitch with some other chain families, so the roller diameter and inner width must stay in the identification check.
A standard request can start with the chain marking and required tooth count. A custom or replacement request should include the applicable drawing, sample, measured sprocket or shaft information. The chain and the shaft interface need to be checked as one assembly.
Size reference
08A Sprockets
- SpecificationReference
- Chain referenceISO 606 08A
- SeriesA-series
Quick Specifications
| Specification | Reference |
|---|---|
| Chain reference | ISO 606 08A |
| Series | A-series |
| Pitch | 12.700 mm |
| Roller or bush diameter | 7.950 mm |
| Inner width | 7.850 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
These values identify the mating chain. They are not finished sprocket dimensions. Pitch diameter, outside diameter, tooth width, bore and hub dimensions depend on the tooth count, strand arrangement and machine drawing.
| Chain | Series | Pitch (mm) | Roller or bush diameter (mm) | Inner width (mm) |
|---|---|---|---|---|
| 08A | A | 12.700 | 7.950 | 7.850 |
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. Include the full strand suffix with 08A. The base designation alone is not enough for a multi-strand part.
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 drawing-defined forms.
Do not assign a tooth count from the chain size alone. Confirm 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 08A Sprockets
Send the ISO series, chain reference, number of teeth, strand, bore, keyway, hub dimensions and quantity. Add 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 or bush 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 08A 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
08A sprocket requests commonly come from industrial transmission, packaging lines, conveyors and international OEM equipment. 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
An ISO 08A chain and an ISO 08B chain have the same listed pitch but different chain dimensions. Their sprockets are not interchangeable from pitch alone. The series suffix must stay in every RFQ and drawing. Compare pitch, roller or bush diameter, inner width, strand spacing, tooth form and shaft interface before approving a substitute.
How to Select
- Confirm ISO 606, the A-series suffix and the complete 08A chain reference.
- 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 or bush 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 are the 08A chain dimensions?
The 08A row lists 12.700 mm pitch, 7.950 mm roller or bush diameter and 7.850 mm inner width.
Is 08A the same as 08B?
No. The series suffix identifies different chain geometry even though the pitch is shared.
What bore options can an 08A sprocket have?
The RFQ can specify pilot or finished bore, keyway, bushing, hub and another drawing-defined shaft interface.
How do I order a replacement 08A sprocket?
Send the chain marking, teeth, strand, worn sprocket dimensions, shaft details and any original drawing.
Request a Quote for 08A Sprockets
Send the ISO series, chain reference, number of teeth, strand, bore, keyway, hub, quantity and application. For custom or replacement work, attach the drawing, sample photo, old sprocket dimensions or existing part number. This prevents a shared-pitch comparison from being treated as a complete fit confirmation.