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FAQs

The standard series answers it: each shaft diameter band has its designated key section — width by height — so measuring the shaft (or the keyway's width) nominates the key, with length set by the hub. The series is listed against the sections; a shaft diameter via Ask Simon gets the section in one reply.

Snug by hand: it should slide into the keyway with firm finger pressure — never hammered, which distorts the seat, and never rattling, which lets reversing loads hammer the keyway oval. Dress burrs, clean the seat, and fit dry; the feel is the gauge, and 'push fit' is the phrase to remember.

Looseness in service, almost always: a slack fit, a hub never properly secured, or reversing and shock loads working a once-snug key — each lets the key hammer its seat oval, and the oval grows. The repair is machining territory; the prevention is fit, the hub's own clamping doing its job, and shock addressed at source.

Both have their place: stock lengths suit the workshop that cuts, dresses and fits to each job — the economical habit — while finished keys suit the repair that wants exact length now. Either way the section comes from the standard series and the ends get dressed; a sharp-cornered key is a stress-raiser in waiting.

Returns are accepted within 30 days of purchase, in original packaging, on orders delivered within the United Kingdom. For damaged-on-arrival items, report within 24 hours with photographs to [email protected] — we will typically arrange collection and replacement at no cost to you. For parts that don't fit your machine, the Fit Guarantee covers a hassle-free return at no cost. For buyer's remorse — you've changed your mind or ordered the wrong item, email us first to obtain a Return Merchandise Number; a restocking fee may apply. Refunds are issued to the original payment method once the return is inspected.

Delivery time depends on the product, your destination, and availability — the estimated time for any item appears on the product page, and 'Check where we deliver' confirms coverage for your postcode before you order. Next-day delivery is available on most products; the option appears at checkout when applicable. We deliver across the UK, Europe, the Middle East, and Africa. Use the country selector at checkout to confirm coverage and delivery options for your destination.

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Parallel Keys

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Parallel keys are the small steel that transmits the torque: the rectangular-section keys seated between shaft and hub that drive pulleys, sprockets, couplings and gears on every machine the rest of the catalogue serves. PartsForMachines supplies parallel keys to the metric standard sizes, in cut lengths and key steel stock, within the fastener section.

The sizing is standardised and shaft-led: key section, width by height, follows the shaft diameter through the standard series, so a shaft's size nominates its key, with length set by the hub and listed per product alongside the section, in plain carbon key steel as standard and stainless where the environment demands. Stock lengths serve the workshop that cuts to suit, finished keys the repair that wants to fit and go, and the related woodruff and gib-head patterns their own legacy fitments.

The fitting truths are the drive's: a key fits its keyway snugly by hand, never hammered, since a key driven in distorts the seat it's about to work in, and never sloppy, because a loose key hammers its keyway oval under reversing loads, the wallowed keyway being the expensive end of a cheap part. Burrs dressed, seats cleaned, and the hub's grub screw or fit doing the holding while the key does only the driving, which is the division of labour the design assumed.

Bolts, retaining clips and the section sit alongside. For section sizing from a shaft diameter, contact the team via WhatsApp 07754288583.

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FAQs

The standard series answers it: each shaft diameter band has its designated key section — width by height — so measuring the shaft (or the keyway's width) nominates the key, with length set by the hub. The series is listed against the sections; a shaft diameter via Ask Simon gets the section in one reply.

Snug by hand: it should slide into the keyway with firm finger pressure — never hammered, which distorts the seat, and never rattling, which lets reversing loads hammer the keyway oval. Dress burrs, clean the seat, and fit dry; the feel is the gauge, and 'push fit' is the phrase to remember.

Looseness in service, almost always: a slack fit, a hub never properly secured, or reversing and shock loads working a once-snug key — each lets the key hammer its seat oval, and the oval grows. The repair is machining territory; the prevention is fit, the hub's own clamping doing its job, and shock addressed at source.

Both have their place: stock lengths suit the workshop that cuts, dresses and fits to each job — the economical habit — while finished keys suit the repair that wants exact length now. Either way the section comes from the standard series and the ends get dressed; a sharp-cornered key is a stress-raiser in waiting.

Returns are accepted within 30 days of purchase, in original packaging, on orders delivered within the United Kingdom. For damaged-on-arrival items, report within 24 hours with photographs to [email protected] — we will typically arrange collection and replacement at no cost to you. For parts that don't fit your machine, the Fit Guarantee covers a hassle-free return at no cost. For buyer's remorse — you've changed your mind or ordered the wrong item, email us first to obtain a Return Merchandise Number; a restocking fee may apply. Refunds are issued to the original payment method once the return is inspected.

Delivery time depends on the product, your destination, and availability — the estimated time for any item appears on the product page, and 'Check where we deliver' confirms coverage for your postcode before you order. Next-day delivery is available on most products; the option appears at checkout when applicable. We deliver across the UK, Europe, the Middle East, and Africa. Use the country selector at checkout to confirm coverage and delivery options for your destination.

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