7055308263 Mantle for Metso HP300 | Crusher Wear Parts

Metso HP300 Mantle 7055308263 — Built to Crush, Not to Quit

The mantle sits on top of the main shaft head inside your HP300 cone crusher. While the bowl liner stays fixed up in the upper frame, the mantle gyrates eccentrically — that’s where the actual crushing happens. Rock gets pinched between these two surfaces, and every rotation squeezes it down until it breaks. It’s a brutal job, and the mantle takes the worst of it.

Part number 7055308263 is the standard mantle for the Metso HP300. We’ve been casting these for years, and honestly, this is one of our most-requested items. The HP300 is a mid-range machine that shows up everywhere — aggregate quarries, recycling plants, mining operations. Wherever you see one, you’ll need mantles on speed dial.

What Makes the 7055308263 Different from Other HP300 Mantles

The HP300 runs several cavity profiles, and each one uses a different mantle geometry. The 7055308263 is designed for the standard cavity configuration — it handles medium-to-coarse feed sizes and produces a balanced product gradation. If your operation runs a finer setting, you’d need a different part number (like the EF/SH variants), but for general-purpose secondary or tertiary crushing, this is the go-to.

We keep the dimensions identical to Metso OEM specs. Head diameter, bore tolerance, mounting points — everything lines up. No modifications needed. If your current mantle came out as a 7055308263, ours drops right in.

Material Matters More Than You’d Think

We cast these mantles in Mn18Cr2 — that’s 18% manganese with a chromium addition. Here’s why that matters:

• Higher work-hardening rate. When the mantle surface gets hammered by rock, the manganese crystal structure compresses and gets harder. The more impact it takes, the tougher the surface becomes. Mn13 work-hardens too, but slower — in hard rock applications, it can wear through before reaching full hardness.
• Chromium adds bulk hardness. The Cr addition raises the as-cast hardness, giving you better baseline wear resistance from day one, before work-hardening kicks in. This is critical during the first 48 hours of operation when the surface hasn’t fully compressed yet.
• Longer campaign life. We had a customer running HP300s in a Queensland granite quarry. They were burning through Mn13 mantles every 450 hours. Switched to our Mn18Cr2 and got 680-720 hours before changeout. That’s roughly 50% longer — which sounds small until you calculate the downtime savings over a year.

For extremely abrasive conditions — like quartzite or basalt with high silica content — we can also pour high-chrome white iron variants. But that’s a specialty order. For most applications, Mn18Cr2 hits the sweet spot between cost and lifespan.

Common Reasons Mantles Wear Out Early

After 40 years in this business, we’ve seen a lot of mantles die prematurely. The part itself is usually fine — the problem is something else:

• Wrong cavity profile for the feed. If you’re running a coarse mantle but your feed is mostly small material, you’re not using the full crushing chamber. The rock just rubs instead of getting nipped, and that friction wears the mantle surface unevenly.
• Tramp metal in the feed. Bucket tooth from a loader, worn drill bit, scrap steel — anything that drops into the feed hopper will gouge the mantle. We’ve seen single pieces of rebar carve channels deep enough to crack the casting. Metal detection at the feed point isn’t optional, it’s mandatory.
• Choke feed not maintained. The HP300 is designed to run choke-fed — meaning the crushing chamber stays full. If you’re running starved feed (rock only in one section), you get localized wear on one side of the mantle. It’ll still crush, but the wear pattern goes lopsided and you lose half the liner life.
• Incorrect eccentric throw or speed. The HP300’s stroke and RPM are calibrated for specific liner profiles. If someone adjusted the throw settings without updating the mantle type, the wear pattern goes wrong fast.

How We Make Sure Ours Fit Right

Every mantle we cast goes through dimensional inspection before it ships. We check the head seat diameter, the bore concentricity, the mounting lug positions, and the overall profile height. If it’s out of tolerance by more than 0.5mm on any critical dimension, it doesn’t ship. Simple as that.

We also do material certification on every heat lot — chemical composition verified by spectrometer, hardness tested on samples from each pour. You get a test report with your shipment. No guessing, no “trust me.”

One thing we’ve learned the hard way: casting consistency is more important than individual piece quality. If your 10th mantle from the same order is 2mm shorter than your first, you’ve got a process problem. We control our sand molds, pouring temperature, and cooling rates to keep every casting in the same batch within tight tolerances.

Quick Specs for 7055308263

• Part Number: 7055308263
• Compatible Machine: Metso HP300 cone crusher
• Part Type: Mantle (moving cone liner)
• Material: Mn18Cr2 (high manganese steel with chromium)
• Hardness: HB 200-230 as-cast, work-hardens to HB 500+ in service
• Weight: Approximately 340 kg (depending on profile)
• Surface Finish: As-cast, no machining required on wearing surfaces

If You’re Not Sure Which Mantle You Need

It happens more than you’d think. Someone reads the part number off an old mantle that’s so worn the casting marks are half gone, or they’re not sure if their HP300 is configured for the standard or short-head cavity. Send us a photo of the existing mantle, or the serial number plate from the crusher, and we’ll sort it out. We’ve matched part numbers from blurry photos before — it’s not the first time, and it won’t be the last.

We ship worldwide from our warehouse. Most orders go out within 3-5 business days if we have stock. If you need a custom alloy or non-standard cavity profile, lead time is typically 4-6 weeks from order confirmation.

Drop us a line at benny@crusherwearparts.cn if you want a quote or just want to double-check the part number. No pressure — we’d rather sell you the right part once than sell you the wrong part twice.

Related: Check out our full range of cone crusher wear parts for Metso HP series machines.