{"id":2587,"date":"2026-07-01T06:03:33","date_gmt":"2026-07-01T06:03:33","guid":{"rendered":"https:\/\/hydrauliccylindersprice.com\/product\/rotary-drilling-mast-cylinder\/"},"modified":"2026-07-01T06:03:36","modified_gmt":"2026-07-01T06:03:36","slug":"rotary-drilling-mast-cylinder","status":"publish","type":"product","link":"https:\/\/hydrauliccylindersprice.com\/el\/product\/rotary-drilling-mast-cylinder\/","title":{"rendered":"Rotary Drilling Mast Cylinder"},"content":{"rendered":"

<\/p>\n

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\n \"Rotary<\/p>\n
\n Rotary Drilling Rig<\/span><\/p>\n

Rotary Drilling Mast Cylinder<\/h2>\n

The mast is the spine of the drilling rig \u2014 a 20\u201330 metre vertical guide rail along which the power head travels. The mast cylinder positions this spine at the correct angle relative to the ground and braces it against the reaction forces of drilling. Every borehole’s accuracy starts here.<\/p>\n

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140\u2013350mm<\/span>Bore<\/span><\/div>\n
\u22645,550mm<\/span>Stroke<\/span><\/div>\n
32 MPa<\/span>Pressure<\/span><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

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Mast Cylinder vs Luffing Cylinder \u2014 Two Cylinders, Two Kinds of Angle Control<\/span><\/h2>\n
\n \"Rotary<\/p>\n

The luffing cylinder<\/a> (#24) erects the mast from transport-horizontal to working-vertical \u2014 a large-angle, high-force motion performed once per setup. The mast cylinder operates after the mast is erected: it fine-adjusts the mast angle in the fore\/aft plane and \u2014 on some rig designs \u2014 provides the structural bracing that holds the mast rigid against the lateral forces generated during drilling.<\/p>\n<\/div>\n

The mast cylinder connects the top (or mid-height) of the mast to the rig’s chassis through a linkage. By extending or retracting, it tilts the mast forward or backward by small amounts \u2014 typically \u00b15\u00b0 from the vertical set by the luffing cylinder. This fine-tilt capability allows the operator to compensate for ground slope, chassis settling, and borehole position offsets without re-levelling the entire machine.<\/p>\n

The 5,550 mm stroke is driven by the mast height \u2014 the cylinder’s connection point is high on the mast (for maximum leverage), and the long stroke accommodates the full range of mast-to-chassis distance as the mast tilts through its adjustment range. Korea Ever-Power manufactures the mast cylinder as the second of three rotary drilling rig cylinders<\/a>.<\/p>\n<\/section>\n

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Technical Specifications<\/span><\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nSpecification<\/th>\n<\/tr>\n<\/thead>\n
Product<\/td>\nRotary Drilling Mast Cylinder<\/td>\n<\/tr>\n
Function<\/td>\nControl the mast \u2014 adjust angle between mast and ground<\/td>\n<\/tr>\n
Bore Diameter<\/td>\n140 mm \u2013 350 mm<\/td>\n<\/tr>\n
Rod Diameter<\/td>\n90 mm \u2013 230 mm<\/td>\n<\/tr>\n
Stroke<\/td>\n\u2264 5,550 mm<\/td>\n<\/tr>\n
Working Pressure<\/td>\nUp to 32 MPa<\/td>\n<\/tr>\n
Application<\/td>\nRotary Drilling Rig<\/td>\n<\/tr>\n
Certification<\/td>\nISO 9001 \u00b7 100% hydrostatic tested<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/section>\n

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The Mast Cylinder as a Structural Brace \u2014 Absorbing Drilling Reaction Forces<\/h2>\n

During drilling, three reaction forces try to move the mast out of position. The mast cylinder resists all three simultaneously:<\/p>\n

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\n Torque reaction \u2014 rotational twisting<\/strong><\/p>\n

The rotary table applies 200\u2013500 KNm of torque to the drill string. The equal-and-opposite torque reaction tries to twist the mast around its vertical axis. The mast cylinder, connected at an offset from the mast centreline, provides a restoring moment that opposes this twist \u2014 keeping the mast from rotating as the drill turns.<\/p>\n<\/p><\/div>\n

\n Crowd force reaction \u2014 forward tilt<\/strong><\/p>\n

The pressurised cylinder (#26) pushes the power head downward with 100\u2013300 KN of force to penetrate hard ground. This downward force, acting at the top of the mast, creates a forward-tilting moment on the mast base. The mast cylinder pushes back, preventing the mast from leaning forward under the drilling crowd force.<\/p>\n<\/p><\/div>\n

\n Wind loading \u2014 lateral push<\/strong><\/p>\n

A 25-metre mast presents a large sail area to the wind. At working wind speeds (up to 15 m\/s), the lateral wind force on the mast can reach 10\u201330 KN. The mast cylinder’s counterbalance valve and the oil column’s stiffness provide damping that prevents the mast from oscillating in gusty conditions. Contact the Korea Ever-Power engineering team<\/a> for mast cylinder force calculations.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n \"Rotary
\n<\/section>\n

<\/p>\n

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Manufacturing Process<\/span><\/h2>\n
\n \"Korea<\/p>\n

The mast cylinder combines long stroke (5,550 mm) with a substantial bore (140\u2013350 mm) \u2014 creating a large, heavy cylinder that must be manufactured with the same rod-straightness and concentricity standards as the crane luffing cylinder. Rod straightness \u22640.1 mm\/metre across the full 5.5-metre extended length. Euler buckling is verified at full extension under the combined axial and lateral loading from drilling reaction forces.<\/p>\n<\/div>\n

Bore finish Ra 0.2\u20130.4 \u00b5m. Chrome plating 50\u201380 \u00b5m (construction site environment \u2014 bentonite slurry, drilling mud, and cement splash are the primary contaminants). The rod eye uses a spherical bearing to accommodate the changing angle between the cylinder and the mast as the mast tilts. Seals are polyurethane + NBR wipers rated for -30 \u00b0C to +80 \u00b0C.<\/p>\n

Every mast cylinder is hydrostatic tested at 1.5\u00d7 rated pressure and load-holding tested with a counterbalance valve \u2014 verifying zero drift under simulated drilling reaction forces over a defined hold period.<\/p>\n<\/section>\n

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OEM & ODM<\/span><\/h2>\n
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What You Provide<\/strong><\/div>\n
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Rig model, mast height and weight, mast pivot geometry, required tilt range, maximum drilling torque and crowd force, wind speed rating, bore\/rod\/stroke or force requirement, system pressure, counterbalance valve specification, and the mast-to-chassis linkage drawing.<\/p>\n<\/div><\/div>\n

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What the Factory Delivers<\/strong><\/div>\n
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Engineering drawing with bore, rod (buckling-verified), stroke, spherical rod eye, counterbalance valve provisions, seal specification, and mounting dimensions. Hydrostatic + load-holding test certificate. Seal kits. Browse the industrial engineering cylinders<\/a> and the Korea Ever-Power catalogue<\/a>.<\/p>\n<\/div><\/div>\n<\/p><\/div>\n

\"Korea
\n<\/section>\n

<\/p>\n

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FAQ<\/span><\/h2>\n
\n
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How does the mast cylinder differ from the luffing cylinder (#24)?<\/h3>\n

The luffing cylinder erects the mast from horizontal to vertical (large angle, high force, used once per setup). The mast cylinder fine-adjusts the mast angle (small adjustments \u00b15\u00b0, moderate force, used continuously during positioning) and braces the mast against drilling reaction forces. On some rig designs, the mast cylinder also assists the luffing cylinder during mast erection.<\/p>\n<\/p><\/div>\n

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Why is the bore larger than the luffing cylinder?<\/h3>\n

Because the mast cylinder’s bracing function requires higher stiffness \u2014 a larger bore (and rod) increases the hydraulic stiffness of the oil column, reducing mast deflection under dynamic drilling loads. The luffing cylinder’s primary function is motion; the mast cylinder’s primary function is rigidity.<\/p>\n<\/p><\/div>\n

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Can Korea Ever-Power supply all three rotary drilling cylinders as a set?<\/h3>\n

Yes \u2014 luffing (#24), mast (#25), and pressurised (#26) cylinders are available as a coordinated set engineered for the same rig’s hydraulic system. Single-source supply simplifies procurement and guarantees pressure-rating and seal compatibility across all three cylinders. Browse telescopic cylinders<\/a> and forklift cylinders<\/a> for other positioning-cylinder applications.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

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Related Categories<\/span><\/h2>\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><\/p>\n

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

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

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

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

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

Rotary drilling mast cylinder \u2014 the hydraulic actuator that controls the mast position on a rotary drilling rig, adjusting the angle between the mast and the ground. While the luffing cylinder (#24) sets the broad mast angle, the mast cylinder provides fine positional control \u2014 adjusting the mast’s fore\/aft tilt and supporting the mast structure against drilling reaction forces. Bore 140\u2013350 mm, stroke \u22645,550 mm, 32 MPa. The second of three rotary drilling rig cylinders from Korea Ever-Power. ISO 9001. OEM & ODM.<\/div>","protected":false},"featured_media":2588,"comment_status":"closed","ping_status":"open","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[854],"product_tag":[],"class_list":["post-2587","product","type-product","status-publish","has-post-thumbnail","product_cat-mobile-machinery-hydraulic-cylinders","pa_editor-cxm","first","instock","product-type-simple"],"_links":{"self":[{"href":"https:\/\/hydrauliccylindersprice.com\/el\/wp-json\/wp\/v2\/product\/2587","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hydrauliccylindersprice.com\/el\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/hydrauliccylindersprice.com\/el\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/el\/wp-json\/wp\/v2\/comments?post=2587"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/el\/wp-json\/wp\/v2\/media\/2588"}],"wp:attachment":[{"href":"https:\/\/hydrauliccylindersprice.com\/el\/wp-json\/wp\/v2\/media?parent=2587"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/el\/wp-json\/wp\/v2\/product_brand?post=2587"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/el\/wp-json\/wp\/v2\/product_cat?post=2587"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/el\/wp-json\/wp\/v2\/product_tag?post=2587"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}