7055308254 Upper Mantle Extra Fine SH for Metso HP300 | Crusher Wear Parts

Part Number & Specifications

Part number 7055308254 — an upper mantle cast for the Metso HP300 cone crusher, specifically in the extra fine short head cavity profile.

If you’re running an HP300 in SH configuration and need the upper section of the mantle assembly, this is the casting you’re after. We’ve been making these for years, and I can tell you — the extra fine profile is one of those parts where getting the dimensions right actually matters more than people think. Even half a millimeter off on the thread engagement and you’re looking at premature loosening under load.

Typical specs we hold to:

• Material: Mn18Cr2 (standard), Mn22Cr2 available on request
• Hardness: HB 200-230 as-cast, work-hardens to HRC 50+ during service
• Weight: varies by cavity profile — upper mantle sections for HP300 EF/SH run lighter than standard cavity equivalents
• Thread: matches Metso OEM main shaft thread specification
• Surface finish: as-cast with machining on sealing surfaces and thread

Application

The upper mantle on an HP300 short head sits at the top of the crushing chamber. In an extra fine configuration, this part handles the final size reduction — the material coming through here is already pretty small, so you’re dealing with high compressive loads but smaller feed particles.

We see these in:

• Aggregate production where the end product needs to be tightly graded (manufactured sand plants, fine aggregate for asphalt)
• Industrial mineral processing — limestone, dolomite, andesite where the product spec demands consistent fine output
• Recycling applications processing concrete or demolition waste through the fine chamber

The HP300 short head extra fine is a popular setup for customers who need to produce a specific top-size. If your operation is one of those, you probably already know that the upper mantle takes a different wear pattern than the lower section — more abrasion, less impact.

Material & Features

Manganese steel is the go-to material here for a reason. Mn18Cr2 is our standard for HP300 mantles — it gives you a good balance of initial toughness and work-hardening capability. The more the surface gets compressed during crushing, the harder it gets. That’s the beauty of manganese steel.

We’ve had customers ask about Mn13 vs Mn18 — here’s the short version. Mn13 is cheaper upfront but it work-hardens less aggressively. On hard, abrasive rock like granite or basalt, you’ll see significantly shorter life. One customer in Western Australia switched their HP300 mantles from Mn13 to our Mn18Cr2 and got roughly 30% longer wear life on andesite. The math worked out even though the per-unit cost was higher.

For particularly demanding applications — say you’re processing quartzite or something with extreme silica content — we can cast in Mn22Cr2 or add chromium modification. The alloy cost goes up, but if you’re burning through standard mantles every 6-8 weeks, it’s worth the conversation.

What we guarantee on these castings:

• OEM dimensions — we machine from Metso drawings, not reverse-engineered copies
• Proper heat treatment — water toughening at 1050°C followed by controlled cooling
• Chemical composition verified per heat — C, Mn, Cr all within spec
• Thread fit tested before shipping — no cross-threading surprises at install

Why Choose Us

We’ve been casting crusher wear parts for over 40 years. Not trading them, not sourcing them from three different foundries and slapping our name on — actually casting them in our own facility.

When you order a 7055308254 upper mantle from us, you’re getting a part made to the same dimensional standards as the OEM, with material that meets or exceeds the original specification. We’ve done the metallurgical work, we’ve run the wear tests, and we’ve had hundreds of these running in the field across six continents.

A few things customers tell us matter:

• Lead time — we stock common cavity profiles and can ship most HP300 mantles within 2-3 weeks
• Consistency — every casting from the same pattern, same heat treatment cycle, same QC checks
• Technical support — if you’re not sure about cavity profile selection or material grade, we can help

We also make the matching bowl liner, lower mantle, and feed cone for the HP300. If you’re replacing the upper mantle, it’s worth checking whether the rest of the chamber linings are due. Mixed wear across different cavity sections can cause uneven product size and accelerated wear on the newer parts.

For other HP series mantles, we also stock parts like the 7055308252 standard mantle for HP300 and 1050130813 standard mantle for HP200.

Contact

Need a quote on the 7055308254 upper mantle, or not 100% sure this is the right part number for your HP300 configuration? Send us the serial number off your crusher’s nameplate and we’ll confirm the match.

We’re straightforward to work with — no minimum order quantities, no games on pricing. If you’ve got a wear problem or a specific application question, chances are we’ve seen something similar before.

Email: benny@crusherwearparts.cn
WhatsApp: +86 13857400969