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6-Groove SPA Pulleys

Compare 6-groove SPA models by diameter references, taper bush, maximum bore and construction type before confirming the shaft interface.

6-Groove SPA Pulleys

Use this family when the working drive uses 6 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.

6-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.

6-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.

Application context

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 6-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.

6-groove model comparison: practical decision notes

Within the 6-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.

For replacement work, start while the drive is still assembled. Photograph both pulley faces, the belt line, the shaft end and any readable marking. Record the active groove count and belt designation before the belts are discarded. If a guard or frame limits access, measure the available axial and radial envelope. Those observations explain the installation in a way that a removed pulley on a workbench cannot.

For a new design, the order is different but the control principle is the same. Define the intended belt profile, speed relationship, shaft, keyway and installation space first. Then compare models inside the correct groove-count family. Do not begin with a part that happens to be available and reshape the drive around it unless the machine design intentionally accepts that change.

When preparing the RFQ, separate standard product identity from special project requirements. Material, finish, balance, tolerance or inspection requirements should be stated only when they are genuinely controlled by the project. This keeps a standard enquiry efficient and prevents a project-specific requirement from being applied to every pulley in the range.

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 RFQ data checklist before sending a mixed-model request.