Ever received the wrong seal kit for your cylinder? I’ve been there. It wastes time, causes downtime, and risks losing customer trust. Choosing by size avoids all that.

Hydraulic seal kits sized by bore and rod diameter ensure compatibility, reduce failure rates, and simplify maintenance. In this guide, I’ll show you how to select the right kit, fast.

A wrong-sized seal leads to leaks, pressure drops, and equipment failure. Let’s explore how to choose hydraulic seal kits by size with accuracy, speed, and zero guesswork.

What should be included in a standard hydraulic seal kit?

Not all seal kits are equal—some include only basic seals, others pack in everything from buffer seals to wipers. So, what should you look for?

Most complete hydraulic seal kits include 4–6 components: rod seals, piston seals, wipers, guide bands, and optional buffer or wear rings. All must match your groove specs.

What does each component in a hydraulic seal kit do?

A quality kit includes all necessary components to restore sealing performance and prevent wear. Here's a breakdown:

You can explore our hydraulic seal kits categorized by bore and rod size to find the right match for your equipment.

How can I measure and match my hydraulic cylinder to the correct seal kit?

Got an old cylinder but no documentation? That’s where most rebuilders get stuck.

To match the right kit, measure the bore, rod diameter, and groove dimensions. Match these to a corresponding seal kit labeled by size—not machine model.

What measuring techniques help ensure precise sizing?

Using calipers or bore gauges, take the following measurements:

• Rod diameter (e.g. 35 mm)
• Bore diameter (e.g. 63 mm)
• Groove depth & width

For instance:

• Rod Seal: 35x45x7 UN type
• Piston Seal: 63x75x8 KDAS
• Dust Wiper: 35x43x6 FA type

You can also consult our pneumatic cylinder seal or send us a photo. We'll recommend a precise match in hours.

When should you use custom hydraulic seal kits instead of standard ones?

Custom kits sound ideal—but do you really need them?

Standard kits fit 80% of cylinders and offer quick, affordable repairs. Custom kits are only needed for rare or modified cylinders.

How to decide between standard and custom hydraulic seal kits?

Here’s how to decide:

In most shops I’ve worked with, stocking sizes like 40/22, 63/35, 100/55 covers 90% of daily repairs.

Can one hydraulic seal kit be used across different machine brands?

One size might fit many—but not all.

If the bore and rod sizes match, multiple machines may share the same kit. But always confirm seal profile compatibility.

Why brand variation matters when using the same seal size?

Different brands may use different seal profiles, even with identical sizes. A 63/35 cylinder in a Komatsu may use a UN seal, while Volvo uses UHS.

This is why we group kits by size and material—not just brand. See our hydraulic guide rings and dust wipers for pneumatic cylinders for mix-and-match applications.

Conclusion

Pick by size. Avoid mismatches. Improve sealing life. Choosing by bore and rod diameter makes seal kit selection fast, accurate, and worry-free.

Let us help you find the right seal fast

Unsure about size or material? Send a photo, sketch, or part code:
📧 Email: [email protected]
📱 WhatsApp: +86 17622979498
We’ll identify your kit and ship globally. No MOQ.

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How to Measure Hydraulic Seals for Perfect Replacement?
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