{"id":2364,"date":"2026-06-30T08:43:09","date_gmt":"2026-06-30T08:43:09","guid":{"rendered":"https:\/\/hydrauliccylindersprice.com\/product\/hydraulic-press-side-cylinder\/"},"modified":"2026-06-30T08:43:10","modified_gmt":"2026-06-30T08:43:10","slug":"hydraulic-press-side-cylinder","status":"publish","type":"product","link":"https:\/\/hydrauliccylindersprice.com\/es\/product\/hydraulic-press-side-cylinder\/","title":{"rendered":"Hydraulic Press Side Cylinder"},"content":{"rendered":"

<\/p>\n

<\/p>\n

\n
\n Hydraulic Press \u00b7 Side Cylinder<\/span><\/p>\n

The Force Behind
Balanced Pressing<\/h2>\n

A press with only a master cylinder pushes from the centre. Add side cylinders and the force spreads evenly across the entire ram face \u2014 eliminating the angular tilt that ruins forging accuracy and shortens die life. The side cylinder is not “extra force” \u2014 it is balanced force<\/em>.<\/p>\n

\n
\n
24.7 MN<\/div>\n
Per Cylinder<\/div>\n<\/div>\n
\n
420\u20131000mm<\/span><\/div>\n
Plunger Range<\/div>\n<\/div>\n
\n
\u22644500mm<\/span><\/div>\n
Stroke<\/div>\n<\/div>\n
\n
2 or 4<\/div>\n
Per Press (Typical)<\/div>\n<\/div><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n

Why a Press Needs Side Cylinders<\/h2>\n

Imagine pressing a book flat with one finger in the centre \u2014 the edges lift. Now press with your whole palm \u2014 the book stays flat. That is the difference between a press with only a master cylinder and a press with master plus side cylinders. The master cylinder applies force at the centre of the ram; the side cylinders apply supplementary force outboard, toward the ram edges. Together, they produce a uniform pressure distribution across the entire die face \u2014 which is the fundamental requirement for consistent forging thickness, accurate die fill, and long die life.<\/p>\n

Without side cylinders, the ram deflects under load: the centre (directly above the master cylinder) is pushed hardest, while the edges spring away from the die. This angular deflection \u2014 even a fraction of a millimetre \u2014 causes thicker forgings at the edges, premature die wear at the centre, and flash variation around the parting line. Side cylinders eliminate this deflection by providing force exactly where the ram tends to lift. Korea Ever-Power manufactures side cylinders as part of the complete industrial engineering hydraulic cylinder<\/a> system for press builders.<\/p>\n

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

<\/p>\n

\n

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 Side Cylinder<\/td>\n<\/tr>\n
Function<\/td>\nProvide supplementary thrust alongside the master cylinder<\/td>\n<\/tr>\n
Plunger Diameter<\/td>\n420 mm \u2013 1,000 mm<\/td>\n<\/tr>\n
Stroke<\/td>\n\u2264 4,500 mm<\/td>\n<\/tr>\n
Maximum Thrust Force<\/td>\n24.7 MN per cylinder (plunger 1000 mm \/ 31.5 MPa)<\/td>\n<\/tr>\n
Working Pressure<\/td>\nUp to 31.5 MPa<\/td>\n<\/tr>\n
Typical Quantity Per Press<\/td>\n2 (left + right) or 4 (corners)<\/td>\n<\/tr>\n
Certification<\/td>\nISO 9001 \u00b7 100% hydrostatic tested \u00b7 matched to master cylinder<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/section>\n

<\/p>\n

\n

Master Cylinder vs Side Cylinder \u2014 How They Divide the Work<\/h2>\n

On a press with both master and side cylinders, the total press force is the sum of all cylinder forces. The master cylinder typically provides 50\u201370% of the total force; the side cylinders share the remaining 30\u201350%. The exact split depends on the press design and the forging load distribution required.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n
Characteristic<\/th>\nMaster Cylinder<\/th>\nSide Cylinder<\/th>\n<\/tr>\n<\/thead>\n
Position on press<\/td>\nCentre (1 per press)<\/td>\nOutboard (2 or 4 per press)<\/td>\n<\/tr>\n
Primary role<\/td>\nMain thrust<\/td>\nForce balance & anti-tilt<\/td>\n<\/tr>\n
Plunger range<\/td>\n500\u20131,800 mm<\/td>\n420\u20131,000 mm<\/td>\n<\/tr>\n
Force per cylinder<\/td>\nUp to 80 MN<\/td>\nUp to 24.7 MN<\/td>\n<\/tr>\n
Share of total press force<\/td>\n50\u201370%<\/td>\n30\u201350% (combined)<\/td>\n<\/tr>\n
Can press operate without it?<\/td>\nNo \u2014 essential<\/td>\nDepends on press design<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n
\n Example: <\/strong>
\n A 60 MN die-forging press might use one 40 MN master cylinder (plunger 1,270 mm) plus two 10 MN side cylinders (plunger 635 mm each). Total force: 40 + 10 + 10 = 60 MN. The master provides 67% of the force at the centre; the two side cylinders provide 33% distributed to the left and right edges of the ram.<\/span>\n <\/div>\n<\/section>\n

<\/p>\n

\n

Design Features Specific to Side Cylinders<\/h2>\n
\n \"Side<\/p>\n

Side cylinders share many engineering fundamentals with the master cylinder \u2014 honed bore, chrome-plated plunger, high-pressure seals \u2014 but they have several design requirements that are specific to their outboard mounting position and their synchronisation role.<\/p>\n

Stroke synchronisation with the master cylinder<\/strong> is the most critical design requirement. All cylinders on the press must extend at exactly the same rate \u2014 otherwise the ram tilts during the press stroke. Korea Ever-Power manufactures side cylinders with bore tolerances matched to the master cylinder, ensuring that the same hydraulic flow produces the same extension speed across all cylinders. For presses requiring tighter synchronisation, proportional flow divider valves are used in the hydraulic circuit.<\/p>\n

Identical stroke length<\/strong> to the master cylinder is mandatory \u2014 even though the side cylinders have smaller plunger diameters. The ram is a rigid beam: if the master cylinder has a 3,000 mm stroke, the side cylinders must also stroke 3,000 mm so the ram remains parallel throughout the press cycle.<\/p>\n

Symmetrical mounting<\/strong> \u2014 side cylinders are always installed in symmetrical pairs (left\/right) or sets of four (corners). Asymmetric force application would cause the ram to tilt in the opposite direction from the imbalance, defeating the purpose of the side cylinders entirely. The mounting flange dimensions, bolt patterns, and port positions are mirrored between left and right cylinders.<\/p>\n<\/p><\/div>\n

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

<\/p>\n

\n

When Side Cylinders Are Required<\/h2>\n

Not every hydraulic press uses side cylinders \u2014 smaller presses with narrow rams and concentric loads may operate with the master cylinder alone. Side cylinders become necessary when:<\/p>\n

\n
\n Wide-Ram Presses<\/strong><\/p>\n

When the ram width exceeds approximately 1.5\u00d7 the master cylinder plunger diameter, the unsupported edges begin to deflect under load. Side cylinders push the edges down, maintaining parallelism. Common on die-forging presses and multi-station stamping presses with wide bolsters.<\/p>\n<\/p><\/div>\n

\n Off-Centre Loading<\/strong><\/p>\n

When the workpiece or die is not centred under the ram (multi-cavity forging, asymmetric parts), the load centre shifts away from the master cylinder axis. Side cylinders compensate for this eccentric load, preventing ram tilt and uneven die contact.<\/p>\n<\/p><\/div>\n

\n High-Precision Forging<\/strong><\/p>\n

Aerospace and automotive precision forgings require thickness tolerances of \u00b10.5 mm or tighter. Even minor ram tilt produces thickness variation. Side cylinders reduce ram angular deflection from the millimetre range to the hundredths-of-a-millimetre range \u2014 a 10\u201350\u00d7 improvement in parallelism.<\/p>\n<\/p><\/div>\n

\n Total Force Exceeds Single-Cylinder Limit<\/strong><\/p>\n

When the total required press force exceeds what a single master cylinder can provide at the available system pressure, side cylinders contribute additional thrust. A 100 MN press might use a 60 MN master cylinder plus two 20 MN side cylinders rather than attempting an impractically large single plunger.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n \"Side
\n<\/section>\n

<\/p>\n

\n
\n

Engineering Note \u2014 Sizing Side Cylinders for Your Press<\/h2>\n

The side cylinder plunger diameter is determined by how much supplementary force is needed and how many side cylinders the press frame accommodates. The calculation starts from the total press force minus the master cylinder force:<\/p>\n

\n

Step 1:<\/strong> Total press force required = 60 MN<\/span><\/p>\n

Step 2:<\/strong> Master cylinder force (selected) = 40 MN<\/span><\/p>\n

Step 3:<\/strong> Remaining force for side cylinders = 60 \u2212 40 = 20 MN<\/span><\/p>\n

Step 4:<\/strong> Using 2 side cylinders: 20 \u00f7 2 = 10 MN each<\/span><\/p>\n

Step 5:<\/strong> At 31.5 MPa \u2192 plunger area = 10 \u00f7 31.5 = 0.317 m\u00b2 \u2192 plunger \u2205 \u2248 636 mm<\/span><\/p>\n<\/p><\/div>\n

Korea Ever-Power performs this sizing calculation as part of every press cylinder quotation \u2014 including the force split ratio, plunger diameters, and synchronisation verification. The side cylinders are manufactured as a matched set with the master cylinder<\/a> to ensure dimensional compatibility and stroke synchronisation.<\/p>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n

Matched-Set Manufacturing<\/h2>\n
\n \"Korea<\/p>\n

Side cylinders for a hydraulic press are never manufactured individually \u2014 they are produced as matched sets alongside the master cylinder for that specific press. “Matched” means: identical stroke length verified to \u00b10.5 mm, bore diameters within mutual tolerance for synchronised extension speed, identical seal specifications, and port positions mirrored for left\/right symmetry.<\/p>\n

All cylinders in the set \u2014 master and sides \u2014 are pressure-tested on the same bench using the same instrumentation, and their test certificates are issued as a set with cross-referenced serial numbers. This traceability ensures that if a side cylinder needs seal replacement or service in the future, the factory can retrieve the exact specification from the original set.<\/p>\n

For replacement side cylinders on existing presses, Korea Ever-Power can manufacture a single replacement matched to the surviving cylinders \u2014 provide the serial number or drawing number of the original set, and the factory will reproduce the specification exactly.<\/p>\n<\/p><\/div>\n

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

<\/p>\n

\n

OEM & ODM<\/h2>\n
\n
\n
\n

What You Provide<\/h3>\n<\/div>\n
\n

Total press force, master cylinder specification (or let Korea Ever-Power design the full set), number of side cylinders (2 or 4), system pressure, stroke, mounting flange dimensions and bolt pattern, port positions, and press frame GA drawing showing the side cylinder mounting locations. For replacements: serial number or drawing number of the original set.<\/p>\n<\/div><\/div>\n

\n
\n

What the Factory Delivers<\/h3>\n<\/div>\n
\n

Complete matched set (master + side cylinders) or side cylinders only. Engineering drawing with force split, plunger diameters, synchronisation verification, and mirrored port positions. 100% hydrostatic test with set certificate. Seal kits matched to each cylinder in the set. Browse all industrial press cylinders<\/a>.<\/p>\n<\/div><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n

FAQ<\/h2>\n
\n
\n

Can I add side cylinders to a press that currently has only a master cylinder?<\/h3>\n

Potentially \u2014 but the press frame must have mounting provisions (bosses, bolt holes, or machined faces) for the side cylinders, and the hydraulic system must have capacity to supply the additional flow. Retrofitting side cylinders to a press originally designed without them is a significant engineering project that involves structural analysis of the frame, hydraulic system redesign, and control system modification. Contact the hydraulic cylinder engineering team<\/a> for retrofit feasibility assessment.<\/p>\n<\/p><\/div>\n

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What happens if one side cylinder fails during pressing?<\/h3>\n

The press force becomes asymmetric \u2014 the ram tilts toward the working side cylinder and away from the failed one. This produces uneven forging thickness and can damage the dies. Most modern press controls detect the pressure imbalance and stop the press automatically. The failed side cylinder must be repaired before resuming production \u2014 operating with an asymmetric cylinder set is never acceptable.<\/p>\n<\/p><\/div>\n

\n

Do the side cylinders need to be the same brand as the master cylinder?<\/h3>\n

They need to be dimensionally matched \u2014 same stroke, compatible bore tolerances, same pressure rating. Manufacturing them as a set from the same factory (Korea Ever-Power) guarantees this compatibility. Mixing cylinders from different manufacturers risks dimensional mismatches that cause synchronisation problems. This same principle applies to matched forklift lift cylinder pairs<\/a> and telescopic dual-cylinder hoist<\/a> configurations.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n

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

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

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

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

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

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

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

Hydraulic press side cylinder \u2014 the supplementary force actuator that works alongside the master cylinder to deliver balanced, tilt-free press force across the full width of the ram. While the master cylinder provides the primary thrust at the press centre, the side cylinders (typically two or four, mounted symmetrically on the press frame) distribute additional force to the ram edges \u2014 preventing angular deflection that would cause uneven forging thickness or premature die wear. Plunger 420\u20131000 mm, stroke \u22644,500 mm, thrust up to 24.7 MN per cylinder. Korea Ever-Power manufactures side cylinders as matched sets with the master cylinder for guaranteed force synchronisation. ISO 9001. OEM & ODM.<\/div>","protected":false},"featured_media":2365,"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-2364","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\/es\/wp-json\/wp\/v2\/product\/2364","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/comments?post=2364"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/media\/2365"}],"wp:attachment":[{"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/media?parent=2364"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/product_brand?post=2364"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/product_cat?post=2364"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/product_tag?post=2364"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}