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3-Groove SPA Pulleys

Compare 3-groove SPA models by diameter references, taper bush, maximum bore and construction type before confirming the shaft interface.

3-Groove SPA Pulleys

Use this family when the working drive uses 3 active SPA V-grooves. Groove count is the first filter, not the final selection. Compare P, O, construction type, taper bush and maximum bore on the individual model pages, and keep the shaft interface attached to the purchasing record.

3-groove SPA pulley

Where to start

For replacement work, photograph the installed drive before disassembly. Record the marking, belt section, shaft, keyway and bush marking. For a new drive, begin from speed relationship and installation envelope rather than from an arbitrary outside diameter.

Adjacent SPA sizes can share a groove count while using different bush or construction arrangements. Open the model page before releasing the RFQ.

3-groove construction overview

SPA construction overview

The individual model row identifies which type applies. Do not copy hub or letter dimensions from a neighbouring model.

Selection variables

P and O

Keep both diameter references separate.

Bush and bore

Confirm the actual shaft requirement; max bore is not the ordered bore.

Construction type

Use the type to select the correct technical view and hub arrangement.

Application context can add duty, environment and service-access questions, but it does not change the model-specific data. That separation keeps technical selection and operating context clear.

Contesto applicativo

How to compare models

Shortlist by the full model identity, then validate the bush and actual shaft. Check any available exact type drawing when hub position or axial clearance matters. If an exact drawing is not available for a model, request the controlled drawing rather than treating a family view as exact geometry.

Published model range

Request 3-Groove QuotationSPA Size Guide

How to compare adjacent model rows without creating a false match

Move through the family in a controlled order. First keep the SPA profile and groove count fixed. Next compare the P and O references. Then check the taper-bush designation and the actual shaft requirement. Finally, confirm construction type and the letter dimensions that affect axial position or guard clearance. This order reduces the chance that one attractive diameter match hides a different mounting arrangement.

When a model is being replaced from field measurements, write down where each number came from. A measured outside diameter, a marking on the pulley and a value on an old drawing are three different sources of information. They may agree, but they should not be silently merged. If two references conflict, send both with the RFQ and identify which one the machine is expected to control.

For mixed-model purchasing, list each full model and quantity on its own line. The commercial order can still be combined, but the technical identity of each line stays intact. That is especially useful when several machines share the same belt profile but use different shaft sizes or groove counts.

SPA pulley selection parameters

Category-level buying checklist

Replacement

Photograph the drive before removal, capture model and bush markings, measure the shaft and identify the belt profile. Use the model page to compare the correct construction view.

New equipment

Start from the required speed relationship, belt family, shaft and installation envelope. Do not use an arbitrary outside diameter as the starting design constraint.

Custom requirement

Keep the standard SPA geometry separate from any drawing-controlled change. State special material, finish, bore, keyway or inspection only when the project requires it.

Before releasing a purchase order, confirm that the full model, quantity and shaft interface are visible in the order record. If the installation depends on an exact hub offset or letter dimension, attach the current drawing rather than relying on a product photo. This keeps purchasing and maintenance aligned with the same technical reference.

3-groove model comparison: practical decision notes

Within the 3-groove SPA family, groove count stays fixed while diameter, bush and construction details change across the model range. A buyer should be able to trace every important decision to a model marking, a drawing reference, a measurement or a stated machine requirement. When the data comes from different places, keep those references separate until they have been reconciled. This is especially important for pulley diameter, hub position and the shaft interface, because visually similar parts can use different construction arrangements.

Per la sostituzione, iniziare con il gruppo di trasmissione ancora assemblato. Fotografare entrambe le superfici delle pulegge, la linea della cinghia, l'estremità dell'albero e qualsiasi marcatura leggibile. Annotare il numero di scanalature attive e la denominazione della cinghia prima di smaltirle. Se una protezione o un telaio limitano l'accesso, misurare l'ingombro assiale e radiale disponibile. Queste osservazioni spiegano l'installazione in un modo che una puleggia rimossa su un banco di lavoro non può.

Per un nuovo progetto, l'ordine è diverso ma il principio di controllo rimane lo stesso. Definire innanzitutto il profilo della cinghia desiderato, il rapporto di velocità, l'albero, la sede della chiavetta e lo spazio di installazione. Quindi confrontare i modelli all'interno della famiglia di numero di scanalature corretta. Non partire da un componente disponibile e rimodellare la trasmissione attorno ad esso, a meno che il progetto della macchina non accetti intenzionalmente tale modifica.

Nella preparazione della richiesta di offerta (RFQ), è fondamentale distinguere l'identità standard del prodotto dai requisiti specifici del progetto. I requisiti relativi a materiali, finitura, bilanciamento, tolleranze o ispezione devono essere indicati solo se effettivamente vincolati dal progetto. In questo modo, la richiesta di offerta standard risulta più efficiente ed si evita che un requisito specifico del progetto venga applicato a ogni puleggia della gamma.

Before you move from category to model

Confirm the quantity and the machine position as well as the technical identity. A category page is useful for narrowing the range, but the individual model page is where the bush, construction type and letter dimensions become specific. Keep that model page or its accepted drawing with the purchase record.

If the requirement is urgent maintenance, resist the temptation to choose the nearest visual match. A short delay to confirm the belt, shaft and construction reference is usually less costly than installing a part that shifts the belt line or cannot be removed within the available service space.

Related selection tools

Use the taper-bush interface guide when the shaft connection is open, and the Lista di controllo dei dati della richiesta di offerta (RFQ) before sending a mixed-model request.