SIZE REFERENCE / YZEFY SPROCKETS
120 sprockets
120 sprockets are selected for heavy conveyors, agricultural machinery, industrial power transmission, material handling and OEM equipment. The #120 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. The #120 page starts with the chain reference, then moves to the larger shaft and hub details that control a replacement or custom part.
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
120 Sprockets
- SpecificationReference
- Chain referenceANSI #120
- Standard familyANSI / ASME B29.1
Quick Specifications
| Specification | Reference |
|---|---|
| Chain reference | ANSI #120 |
| Standard family | ANSI / ASME B29.1 |
| Pitch | 38.100 mm |
| Roller diameter | 22.230 mm |
| Inner width | 25.220 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) |
|---|---|---|---|
| #120 | 38.100 | 22.230 | 25.220 |
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 #120 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 #120 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 #120 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
#120 sprocket requests commonly come from heavy conveyors, agricultural machinery, industrial power transmission, material handling and 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
ANSI #120 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 #120 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 are the #120 chain reference dimensions?
The table lists a 38.100 mm pitch, 22.230 mm roller diameter and 25.220 mm inner width.
Does #120 specify the number of teeth?
No. The driver and driven tooth counts must be selected for the speed ratio, wrap and application.
What should be checked on a #120 replacement?
Check the mating chain, tooth count, face width, bore, keyway, hub, chain line and shaft space.
Can a #120 sprocket be made from a drawing?
Yes. Include the drawing revision, chain marking, strand, shaft details, material and treatment requirements.
Request a Quote for #120 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.