12B-1 20T Idler Sprocket

Model: 12B-1-20T-IDLER

12B-1 20T Idler Sprocket (model 12B-1-20T-IDLER) from the KEDI Idler Sprockets range, Chain Drive Series. Standard sizes ship quickly; material, heat treatment, bore and finish can be customised to drawing.

Chain Size12B-1
Teeth20
BoreBearing / custom idler bore
RowsSimplex

Send inquiry CAD / technical drawings

Specifications & dimensions

Chain Size	12B-1
Teeth	20
Bore	Bearing / custom idler bore

Technical parameters

Rows

Simplex

Values are nominal; final dimensions are confirmed against the approved drawing.

CAD / technical drawings

2D/3D drawings (PDF, DWG, STEP) for this model are available on request.

Request drawing

Performance features

Bearing or bushed idler arrangements
Hardened tooth options
Common ISO/DIN chain sizes
Suitable for tensioning and routing

Application scenarios

Chain tensioners
Conveyors
Packaging equipment
Industrial power transmission

Industries served

Material handling & logisticsAgricultural machineryPackaging & food processingMining & cementGeneral machinery

Product description

Idler sprockets used to guide, tension or redirect roller-chain drives while maintaining correct chain engagement. This page is prepared for model identification, preliminary selection and quotation. The exact production configuration should be confirmed before order placement.

About this model

12B-1 20T Idler Sprocket (model 12B-1-20T-IDLER) is a standard item in the KEDI Idler Sprockets range, with Chain Size 12B-1; Teeth 20; Bore Bearing / custom idler bore; Rows Simplex. It is produced to drawing and standard, inspected for dimensions and hardness before shipment, and can be supplied alone or as a matched set with mating transmission parts. Material, heat treatment, bore and surface finish can be adapted to the application.

Material & process

Material	Carbon steel or alloy steel plates, case-hardened pins, bushings and rollers
Heat treatment	Through-hardened plates; carburised pins and bushings for wear resistance
Surface	Pre-lubricated; black, shot-peened, zinc or nickel plated and stainless versions on request
Standards	ISO 606 / DIN 8187 (B series) and ANSI B29.1 (A series) dimensions
Custom options	Attachments (A/K/SA/SK), extended pins, hollow pins, special lengths and connecting links

Quality control

Pitch length measured under specified load
Tensile strength sampling per batch
Hardness of pins, bushings and plates checked after heat treatment
Visual check of riveting, rotation and lubrication before packing

How to select

Calculate design power: motor power multiplied by the service factor of the driven machine.
Choose pitch and number of strands from the power rating at the small sprocket speed.
Use at least 17 teeth on the small sprocket; keep a single-stage ratio below 7:1.
Set the centre distance at 30 to 50 pitches and plan lubrication for the running speed.
Order chain and sprockets together so pitch, roller width and tooth form match.

Ordering & packing

For a quotation, send: model 12B-1-20T-IDLER, quantity and delivery destination
For custom versions: drawing or sample, material, heat treatment and finish
Packing: anti-rust oil, moisture-proof wrap, carton or wooden case; labels on request
Lead time: confirmed with the quotation for standard sizes, and after drawing review for custom parts