{"id":2362,"date":"2026-06-30T08:43:09","date_gmt":"2026-06-30T08:43:09","guid":{"rendered":"https:\/\/hydrauliccylindersprice.com\/product\/hydraulic-press-master-cylinder\/"},"modified":"2026-06-30T08:43:09","modified_gmt":"2026-06-30T08:43:09","slug":"hydraulic-press-master-cylinder","status":"publish","type":"product","link":"https:\/\/hydrauliccylindersprice.com\/ja\/product\/hydraulic-press-master-cylinder\/","title":{"rendered":"Hydraulic Press Master Cylinder"},"content":{"rendered":"

<\/p>\n

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\n
\n
\n Hydraulic Press<\/span>
\n Master Cylinder<\/span>\n <\/div>\n

Hydraulic Press Master Cylinder<\/h2>\n

The master cylinder is the primary force-generating actuator at the heart of every hydraulic press \u2014 converting pump pressure into the massive linear thrust that drives the ram downward to forge, stamp, extrude, or form the workpiece. Plunger diameters from 500 mm to 1,800 mm. Thrust forces up to 80 MN<\/strong>.<\/p>\n

\n
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80 MN<\/div>\n
Max Thrust<\/div>\n<\/div>\n
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1800mm<\/span><\/div>\n
Max Plunger<\/div>\n<\/div>\n
\n
4500mm<\/span><\/div>\n
Max Stroke<\/div>\n<\/div><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n \"Hydraulic
\n<\/section>\n

<\/p>\n

\n

The hydraulic press master cylinder sits at the structural and functional centre of every hydraulic press. When the pump delivers high-pressure fluid into the cylinder bore, it acts on the plunger’s cross-sectional area to generate enormous linear force \u2014 sufficient to forge steel ingots, stamp automotive body panels, extrude aluminium profiles, and compact powder metallurgy components. Korea Ever-Power manufactures master cylinders across the full industrial press range \u2014 from compact 10 MN laboratory presses to 80 MN free-forging presses \u2014 as part of our industrial engineering hydraulic cylinder<\/a> programme.<\/p>\n<\/section>\n

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Technical Specifications<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nValue<\/th>\n<\/tr>\n<\/thead>\n
Product<\/td>\nHydraulic Press Master Cylinder<\/td>\n<\/tr>\n
Function<\/td>\nProvide the main thrust for the press<\/td>\n<\/tr>\n
Plunger Diameter<\/td>\n500 mm \u2013 1,800 mm<\/td>\n<\/tr>\n
Stroke<\/td>\n\u2264 4,500 mm<\/td>\n<\/tr>\n
Maximum Thrust Force<\/td>\n80 MN (plunger 1800 mm \/ pressure 31.5 MPa)<\/td>\n<\/tr>\n
Working Pressure<\/td>\nUp to 31.5 MPa<\/td>\n<\/tr>\n
Application<\/td>\nHydraulic press (forging, stamping, forming, extrusion)<\/td>\n<\/tr>\n
Certification<\/td>\nISO 9001 \u00b7 100% hydrostatic pressure tested<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/section>\n

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How the Master Cylinder Works<\/h2>\n
\n \"Master<\/p>\n

The master cylinder operates on Pascal’s law: pressure applied to a confined fluid is transmitted equally in all directions. The hydraulic pump forces fluid into the master cylinder bore at pressures up to 31.5 MPa. This pressure acts on the plunger’s full cross-sectional area \u2014 and because the plunger can be up to 1,800 mm in diameter (an area of approximately 2.54 m\u00b2), the resulting linear force reaches 80 MN (approximately 8,000 tonnes-force).<\/p>\n

The plunger extends downward through the stroke length (up to 4,500 mm), pushing the press ram against the workpiece. The stroke speed is controlled by the pump’s volumetric flow rate \u2014 higher flow means faster press approach speed, lower flow means more precise control during the forming phase. This variable speed capability is a fundamental advantage of hydraulic presses over mechanical presses, which operate at a fixed stroke profile.<\/p>\n

The master cylinder’s bore surface is honed to a mirror finish (typically Ra 0.2\u20130.4 \u00b5m) to ensure consistent seal contact and leak-free operation at the extreme pressures involved. The plunger is hard-chrome plated and ground to matching surface finish \u2014 creating a precision-fitted pair that seals reliably under full working pressure across the entire stroke.<\/p>\n<\/p><\/div>\n

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Engineering Advantages<\/h2>\n
\n
\n
1<\/span><\/div>\n
Extreme Force Output<\/strong><\/p>\n

Up to 80 MN thrust \u2014 sufficient for free-forging presses processing heavy steel ingots, aerospace alloy billets, and large-diameter ring blanks. The large plunger diameter distributes hydraulic force evenly across the press ram face.<\/p>\n<\/div><\/div>\n

\n
2<\/span><\/div>\n
Precise Speed and Force Control<\/strong><\/p>\n

Variable speed throughout the stroke \u2014 fast approach, slow forming, dwell at bottom dead centre, controlled return. This multi-phase profile is essential for precision forging and isothermal forming processes.<\/p>\n<\/div><\/div>\n

\n
3<\/span><\/div>\n
Long Stroke Capability<\/strong><\/p>\n

Strokes up to 4,500 mm accommodate deep drawing, extrusion, and multi-stage pressing operations where the ram must travel a significant distance to complete the forming cycle.<\/p>\n<\/div><\/div>\n

\n
4<\/span><\/div>\n
Inherent Overload Protection<\/strong><\/p>\n

Unlike mechanical presses, the hydraulic master cylinder cannot exceed the set system pressure \u2014 the relief valve limits maximum force regardless of workpiece resistance. This prevents structural damage to the press frame, dies, and cylinder.<\/p>\n<\/div><\/div>\n

\n
5<\/span><\/div>\n
Dwell and Hold at Full Pressure<\/strong><\/p>\n

The master cylinder can hold full pressure at any stroke position \u2014 indefinitely if needed. Critical for powder compaction, composite moulding, and isothermal forging where the workpiece must remain under pressure for a defined time at temperature.<\/p>\n<\/div><\/div>\n

\n
6<\/span><\/div>\n
Field-Repairable Seals<\/strong><\/p>\n

Seals are designed for in-situ replacement without removing the cylinder from the press frame \u2014 reducing maintenance downtime from days to hours. Korea Ever-Power supplies matched seal kits for every master cylinder configuration.<\/p>\n<\/div><\/div>\n<\/p><\/div>\n<\/section>\n

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Application Scenarios<\/h2>\n
\n \"Master<\/p>\n

The hydraulic press master cylinder is the core actuator across the broadest range of industrial metal forming equipment. Korea Ever-Power supplies master cylinders to press builders serving multiple industries \u2014 each with specific force, speed, and precision requirements matched to the forming process.<\/p>\n

Free-forging presses (10\u201380 MN)<\/strong> \u2014 open-die forging of steel ingots, shafts, rings, and blocks. The master cylinder provides the full press tonnage for upsetting, drawing-out, and punching operations on workpieces that can weigh tens of tonnes.<\/p>\n

Die-forging presses (16\u201365 MN)<\/strong> \u2014 closed-die forging of automotive crankshafts, connecting rods, gears, and aerospace structural forgings. The master cylinder must deliver precise force control for consistent die fill and dimensional accuracy.<\/p>\n

Extrusion presses<\/strong> \u2014 aluminium, copper, and steel profile extrusion. The master cylinder provides steady, sustained pressure throughout the long extrusion stroke to maintain constant material flow through the die orifice.<\/p>\n

Sheet metal stamping and deep drawing<\/strong> \u2014 automotive body panels, appliance housings, pressure vessel heads. The master cylinder’s variable speed profile prevents material tearing during deep draws by reducing ram speed as the material approaches its forming limit.<\/p>\n<\/p><\/div>\n

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Engineering Insight \u2014 Force Calculation<\/h2>\n

The thrust force of a hydraulic press master cylinder is calculated from the plunger area and system pressure: F = P \u00d7 A<\/strong>, where F is force (N), P is pressure (Pa), and A is plunger cross-sectional area (m\u00b2). For the maximum configuration \u2014 a 1,800 mm plunger at 31.5 MPa:<\/p>\n

\n
\n
Plunger Area<\/div>\n
\u03c0 \u00d7 (0.9)\u00b2 \u2248 2.545 m\u00b2<\/div>\n<\/p><\/div>\n
\n
System Pressure<\/div>\n
31.5 MPa<\/div>\n<\/p><\/div>\n
\n
Thrust Force<\/div>\n
\u2248 80 MN<\/div>\n<\/p><\/div>\n<\/p><\/div>\n

This illustrates why plunger diameter is the most impactful parameter \u2014 doubling the plunger diameter quadruples the force at the same pressure. When specifying a master cylinder, define the required force first, then work backward to the plunger diameter at your available system pressure. Korea Ever-Power’s engineering team performs this calculation and optimises the plunger-to-pressure ratio for each application. Contact the hydraulic cylinder engineering team<\/a> for custom force calculations.<\/p>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n \"Industrial
\n<\/section>\n

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Manufacturing Process<\/h2>\n

\"Korea<\/p>\n

Master cylinders at the 500\u20131,800 mm plunger scale require specialised heavy machining capability: large-bore deep-hole boring machines for the cylinder barrel, heavy-duty CNC lathes for the plunger and end caps, and precision honing equipment to achieve the Ra 0.2\u20130.4 \u00b5m bore finish required for high-pressure sealing. Korea Ever-Power’s manufacturing facility includes bore-honing capacity up to 2,000 mm diameter and deep-hole boring to 6,000 mm depth \u2014 covering the full master cylinder range. Every cylinder undergoes 100% hydrostatic proof testing at 1.5\u00d7 working pressure before shipment, with individual test certificates traceable by serial number. Mill certificates for the forged steel barrel and plunger materials are available on request for customers with full material traceability requirements.<\/p>\n<\/section>\n

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OEM & ODM \u2014 Custom Master Cylinder Manufacturing<\/h2>\n
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What You Provide<\/h3>\n<\/div>\n
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Required press force (MN or tonnes), system pressure (MPa), stroke length, ram speed profile (approach \/ forming \/ return speeds), mounting interface dimensions (flange bolt pattern, port positions), and press frame drawing or GA drawing. For replacement cylinders: existing cylinder measurements, seal condition photos, and original drawing number if available.<\/p>\n<\/div><\/div>\n

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What the Factory Delivers<\/h3>\n<\/div>\n
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Engineering drawing with plunger diameter, bore, stroke, seal specification, mounting dimensions, and material grade \u2014 all calculated from your force and pressure requirements. Samples for verification. Production timeline 45\u201390 days depending on size. 100% hydrostatic test with certificate. Replacement seal kits available throughout the lifecycle. Browse all industrial engineering hydraulic cylinders<\/a> for complete press systems.<\/p>\n<\/div><\/div>\n<\/p><\/div>\n<\/section>\n

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Frequently Asked Questions<\/h2>\n
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What is the difference between a master cylinder and a side cylinder?<\/h3>\n

The master cylinder provides the primary press force \u2014 it is the largest cylinder, typically mounted centrally, with the largest plunger diameter. The side cylinder<\/a> provides supplementary thrust alongside the master cylinder, typically mounted on either side of the press frame. Together, they share the total press force. Not all presses use side cylinders \u2014 they are added when the total required force exceeds the practical single-plunger capacity.<\/p>\n<\/p><\/div>\n

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How long do the seals last before needing replacement?<\/h3>\n

Seal life depends on cycle rate, system cleanliness, fluid condition, and operating temperature. Typical seal service intervals for master cylinders in forging press duty range from 2,000 to 8,000 operating hours \u2014 roughly 1\u20134 years depending on the duty cycle. Regular fluid analysis and filtration significantly extend seal life. Korea Ever-Power supplies matched replacement seal kits for field changeout without cylinder removal.<\/p>\n<\/p><\/div>\n

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Can you manufacture a replacement for an existing press?<\/h3>\n

Yes. Provide the existing cylinder dimensions (plunger diameter, bore, stroke, mounting interface, port positions) or the original press drawing, and the engineering team will produce an exact replacement. If the original drawing is unavailable, Korea Ever-Power can reverse-engineer from physical measurements. This applies across the full hydraulic cylinder product range<\/a>, including forklift cylinders<\/a> and telescopic cylinders<\/a>.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n

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Related Hydraulic Cylinder Categories<\/h2>\n
\n <\/p>\n
\n
\"Telescopic<\/div>\n
\n
Telescopic Hydraulic Cylinders \u2192<\/div>\n
Dump truck, trailer, and hoist applications.<\/div>\n<\/p><\/div>\n<\/p><\/div>\n

<\/a>
\n <\/p>\n

\n
\"Forklift<\/div>\n
\n
Forklift Hydraulic Cylinders \u2192<\/div>\n
Lift, tilt, steer \u2014 HCYY OEM replacement.<\/div>\n<\/p><\/div>\n<\/p><\/div>\n

<\/a>
\n <\/p>\n

\n
\"Aerial<\/div>\n
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Aerial Work Vehicle Cylinders \u2192<\/div>\n
Scissor, boom, articulating platforms.<\/div>\n<\/p><\/div>\n<\/p><\/div>\n

<\/a>\n <\/div>\n<\/section>\n

<\/p>\n

<\/main><\/p>","protected":false},"excerpt":{"rendered":"

Hydraulic press master cylinder \u2014 the primary force-generating component at the heart of every hydraulic press. The master cylinder converts pump pressure into linear thrust, driving the press ram downward to forge, stamp, draw, or form the workpiece. Plunger diameter 500\u20131800 mm, stroke up to 4,500 mm, maximum thrust force 80 MN (at 1800 mm plunger \/ 31.5 MPa). Korea Ever-Power engineers and manufactures master cylinders for free-forging presses, die-forging presses, extrusion presses, and multi-directional forging presses across the 10 MN\u201380 MN force range. ISO 9001 certified. Custom bore, stroke, mounting, and port configuration. OEM & ODM.<\/div>","protected":false},"featured_media":2363,"comment_status":"closed","ping_status":"open","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[852],"product_tag":[],"class_list":["post-2362","product","type-product","status-publish","has-post-thumbnail","product_cat-industrial-engineering-hydraulic-cylinders","pa_editor-cxm","first","instock","product-type-simple"],"_links":{"self":[{"href":"https:\/\/hydrauliccylindersprice.com\/ja\/wp-json\/wp\/v2\/product\/2362","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hydrauliccylindersprice.com\/ja\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/hydrauliccylindersprice.com\/ja\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/ja\/wp-json\/wp\/v2\/comments?post=2362"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/ja\/wp-json\/wp\/v2\/media\/2363"}],"wp:attachment":[{"href":"https:\/\/hydrauliccylindersprice.com\/ja\/wp-json\/wp\/v2\/media?parent=2362"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/ja\/wp-json\/wp\/v2\/product_brand?post=2362"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/ja\/wp-json\/wp\/v2\/product_cat?post=2362"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/ja\/wp-json\/wp\/v2\/product_tag?post=2362"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}