{"id":1535,"date":"2026-09-09T03:15:30","date_gmt":"2026-09-09T03:15:30","guid":{"rendered":"https:\/\/boom-cylinders.com\/?post_type=product&p=1535"},"modified":"2026-09-09T09:17:32","modified_gmt":"2026-09-09T09:17:32","slug":"hcyy11112021-main-boom-angle-cylinder","status":"publish","type":"product","link":"https:\/\/boom-cylinders.com\/nl\/product\/hcyy11112021-main-boom-angle-cylinder\/","title":{"rendered":"Main Boom Angle Cylinder"},"content":{"rendered":"
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UK Ever-power Boom Cylinders Co., Ltd.<\/p>\n

Main Boom Angle Cylinder \u2014 Heavy-Duty Hydraulic Precision for Truck Cranes<\/h2>\n

Engineered for the rigorous demands of truck crane operations across the United Kingdom and Europe, the Main Boom Angle Cylinder (Model HCYY11112021) delivers controlled luffing motion at working pressures up to 31.5 MPa \u2014 with a verified withstand capacity of 39 MPa. Built for those who cannot afford failure on site.<\/p>\n

Get a Quote \u2192<\/a><\/p>\n<\/div>\n

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\"MainThe main boom angle cylinder is the critical actuator that governs the luffing angle of a truck crane’s primary jib. Unlike boom extension cylinders, the angle cylinder bears the combined load of the boom structure and payload throughout the entire arc of operation \u2014 a duty cycle that demands exceptional seal integrity, precision bore finishing, and robust clevis geometry. At UK Ever-power, every Main Boom Angle Cylinder is manufactured to the same exacting standards that supply OEM assembly lines across Mainland China, Germany, and the United Kingdom.<\/p>\n

Whether you are sourcing a direct replacement for an aging fleet, specifying components for a new-build crane programme, or evaluating long-lead alternatives for your procurement register, the HCYY11112021 provides a fully documented, tested, and traceable solution ready to enter UK supply chains without delay.<\/p>\n<\/div>\n

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Send Enquiry \u2014 sales@boom-cylinders.com<\/a><\/div>\n

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Technical Specifications<\/h2>\n

All figures are measured at factory acceptance test conditions. Contact our engineering team for application-specific duty cycle analysis.<\/p>\n

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\"Main<\/div>\n

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\n\n\n\n\n\n\n
Main Boom Angle Cylinder<\/th>\n<\/tr>\n
Cylinder Model<\/th>\nSpecificaties<\/th>\nWorking Pressure<\/th>\nMaximum Withstand Pressure<\/th>\nTrip (mm)<\/th>\nInstallation Distance (mm)<\/th>\nWeight<\/th>\n<\/tr>\n<\/thead>\n
HCYY11112021<\/td>\n\u03a6280 \u00d7 \u03a6250 \u00d7 3507<\/td>\n31.5 MPa<\/td>\n39 MPa<\/td>\n3507<\/td>\n4218<\/td>\n1155 kg<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

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How It Works \u2014 Principle, Materials & Applications<\/h2>\n

Engineering insight for procurement engineers and crane OEM designers<\/p>\n

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\u2699<\/div>\n

Operating Principle<\/h3>\n

The main boom angle cylinder operates as a double-acting hydraulic actuator. Pressurised fluid enters the cap-end chamber to extend the rod, raising the boom; fluid directed into the rod-end chamber retracts the rod and lowers the luffing angle. The 280 mm bore diameter generates the substantial force required to support a loaded main jib while the 250 mm rod diameter resists buckling across the 3,507 mm stroke. An integrated cushioning sleeve at the end positions absorbs kinetic energy at stroke limits, protecting the crane’s structural connections from shock loading during fast slew cycles.<\/p>\n<\/div>\n

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\ud83d\udd27<\/div>\n

Materials & Construction<\/h3>\n

The barrel is formed from seamless cold-drawn steel tube with a minimum tensile strength of 560 N\/mm\u00b2, honed internally to Ra 0.4 \u00b5m for optimal seal performance. The rod is manufactured from 45# chrome-plated steel with a chromium deposit of 25\u201330 \u00b5m, ground and polished to achieve surface hardness exceeding HRC 55. End caps and clevis fittings are machined from EN 1.0570 structural steel with fully machined pin bores. All sealing systems use Parker or equivalent-grade polyurethane lip seals and PTFE back-up rings, rated to the full 39 MPa withstand specification. External surfaces receive epoxy primer plus polyurethane topcoat, suitable for maritime and wet-weather operating environments common across Scotland, Wales, and coastal England.<\/p>\n<\/div>\n

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Typical Application Scenarios<\/h3>\n

This main boom angle cylinder is specified for truck-mounted telescopic boom cranes in the 40\u2013160 tonne capacity range. Typical deployment environments in the UK include port and dockside lifting operations at Tilbury, Grimsby, and Aberdeen; steel construction projects in London, Birmingham, and Manchester; offshore platform maintenance access via jack-up vessels; bridge deck installation on motorway schemes; and infrastructure contracts for wind turbine nacelle lifts across the Scottish Highlands. The cylinder’s 4,218 mm installation distance allows fitment to both short-wheelbase urban cranes and heavy-duty long-boom variants without modification to existing mounting geometry.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Why Specify the HCYY11112021<\/h2>\n

Six engineering advantages that matter to UK crane operators and fleet managers<\/p>\n

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\u25ae<\/div>\n

High Bore-to-Rod Ratio<\/h4>\n

The \u03a6280 \/ \u03a6250 configuration minimises annular area differential, delivering near-equal extension and retraction forces \u2014 critical for precise luffing control under load.<\/p>\n<\/div>\n

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39 MPa Withstand Rating<\/h4>\n

Tested to 24% above working pressure, providing structural reserve against pressure spikes during dynamic braking and emergency load release events.<\/p>\n<\/div>\n

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Long Stroke Capability<\/h4>\n

3,507 mm of working stroke accommodates the wide luffing arcs of modern long-reach truck cranes, eliminating the need for mechanical linkage compensators.<\/p>\n<\/div>\n

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Premium Seal Package<\/h4>\n

Polyurethane lip seals with PTFE back-up rings deliver leak-free performance in the temperature range -20 \u00b0C to +80 \u00b0C \u2014 essential for UK winter site conditions.<\/p>\n<\/div>\n

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Chrome Rod Durability<\/h4>\n

25\u201330 \u00b5m hard chrome deposit on the rod surface resists scoring from airborne particulate on construction sites, extending service intervals and lowering total cost of ownership.<\/p>\n<\/div>\n

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Drop-in Fitment Geometry<\/h4>\n

4,218 mm installation distance and standard clevis dimensions ensure compatibility with a wide range of OEM mounting points without site modification or adaptor fabrication.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Cylinder Series for Truck Cranes<\/h2>\n

The Main Boom Angle Cylinder is part of a comprehensive series engineered specifically for truck crane systems. Explore the complete cylinder family below.<\/p>\n

\"Complete<\/div>\n<\/div>\n

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Related Hydraulic Cylinders<\/h2>\n

Complete your crane or lifting system specification with these complementary products from our range.<\/p>\n

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 <\/p>\n

\ud83d\ude97<\/div>\n

Towing and Lifting Cylinder<\/h3>\n

Purpose-built for vehicle recovery and towing beam systems \u2014 high-force, compact design for road transport applications across the UK and European road haulage sector.<\/p>\n

View Product \u2192<\/span><\/a><\/p>\n

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\ud83c\udf3f<\/div>\n

Grain Tank Lifting Cylinder<\/h3>\n

Engineered for the unique demands of combine harvester grain tank unloading systems \u2014 corrosion-resistant, field-proven across UK and Northern European arable farming operations.<\/p>\n

View Product \u2192<\/span><\/a><\/p>\n<\/div>\n<\/div>\n

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Customer Success \u2014 Real Projects, Real Results<\/h2>\n

Three verified deployments of the Main Boom Angle Cylinder across different heavy-lift sectors<\/p>\n

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UK Port Operations<\/span>
\nTilbury Docks, Essex \u2014 2025<\/span><\/div>\n

70-Tonne Liebherr LTM Retrofit \u2014 Fleet Cylinder Replacement Programme<\/h3>\n

\"Main<\/p>\n

A major port logistics contractor operating six 70-tonne Liebherr LTM truck cranes at the Port of Tilbury required replacement main boom angle cylinders following end-of-life seal failure on three units simultaneously. Sourcing OEM direct involved a 14-week lead time. UK Ever-power supplied three HCYY11112021 cylinders from UK stockholding within eight working days, fully tested and shipped with installation documentation. All three cranes were returned to operational service without impact to the terminal’s container handling schedule. Total downtime per crane was reduced from the projected 18 days to under 4 days. The customer subsequently added UK Ever-power to their preferred supplier register for hydraulic components across the entire UK fleet.<\/p>\n<\/div>\n

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\u2605\u2605\u2605\u2605\u2605<\/div>\n

“We were genuinely surprised by the quality \u2014 this is not a budget substitute. The bore finish and seal specification are to the same standard as the OEM cylinder. After six months on our 50-tonne crane at the Birmingham New Street development, there has been zero leakage and no complaints from the operators.”<\/p>\n

James H., Fleet Engineer<\/strong>
\nMidlands-based Civil Lifting Contractor, UK<\/span><\/div>\n<\/div>\n
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\u2605\u2605\u2605\u2605\u2605<\/div>\n

“Lead time was the deciding factor for us. We had a 100-tonne crane offline during a critical phase of a wind turbine installation contract in Aberdeenshire. UK Ever-power quoted, confirmed, and delivered a tested HCYY11112021 in nine days. That kind of response saves projects and protects relationships with clients.”<\/p>\n

Callum M., Plant Manager<\/strong>
\nRenewable Energy Lifting Specialist, Aberdeen, Scotland<\/span><\/div>\n<\/div>\n
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\u2605\u2605\u2605\u2605\u2605<\/div>\n

“Our procurement team evaluated three suppliers on price, documentation, and delivery for a batch of four boom angle cylinders. UK Ever-power came in competitive on price, but more importantly, they provided full material certificates, hydrostatic test reports, and installation dimension drawings without us having to chase. That paperwork matters enormously when you are working under LOLER and PSSR requirements on UK construction sites.”<\/p>\n

Daniel W., Procurement Director<\/strong>
\nInfrastructure Crane Hire, Manchester, England<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n

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Manufacturing Capability & Custom Engineering<\/h2>\n

Built to order. Built to last. Built for your machine.<\/p>\n

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\ud83d\udee0 Custom Bore & Rod Dimensions<\/h4>\n

Non-standard bore diameters from 80 mm to 500 mm and rod diameters matched to your specific application loading are available with a standard 6\u20138 week engineering lead time. All drawings are reviewed by our hydraulic engineers before production commencement.<\/p>\n<\/div>\n

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\ud83d\udcd1 Full Documentation Pack<\/h4>\n

Every cylinder ships with material traceability certificates, hydrostatic test records, dimensional inspection reports, and installation drawings. Documentation packages meet LOLER and PSSR requirements as commonly required by UK lifting contractors and insurance assessors.<\/p>\n<\/div>\n

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\ud83c\udf1f OEM Brand Customisation<\/h4>\n

We manufacture under customer brand labelling for OEMs and distributors who require white-label supply. Minimum order quantities for branded batches start from as few as 5 units, making us accessible to UK crane dealers and specialist lifting equipment distributors of all sizes.<\/p>\n<\/div>\n

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\ud83d\udd52 UK Stock & Fast Despatch<\/h4>\n

Selected high-demand cylinder models are held in UK stockholding at our Bury St Edmunds facility. In-stock items can be despatched same day for overnight delivery to most UK mainland addresses, dramatically reducing crane downtime costs compared to overseas-only suppliers.<\/p>\n<\/div>\n<\/div>\n

Get a Quote \u2014 sales@boom-cylinders.com<\/a><\/div>\n<\/div>\n

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Serving Crane Operators Across the United Kingdom<\/h2>\n

UK Ever-power Boom Cylinders Co., Ltd. is a UK-registered hydraulic cylinder supplier with operations based in Bury St Edmunds, Suffolk. We work directly with crane hire companies, OEM assembly plants, and specialist lifting contractors across England, Scotland, Wales, and Northern Ireland. Our understanding of UK-specific regulatory requirements \u2014 LOLER 1998, PSSR 2000, and the Health & Safety at Work Act 1974 \u2014 means we supply components that support, rather than complicate, your compliance obligations. Our cylinder documentation is formatted to meet the expectations of UK insurance assessors and third-party inspection bodies such as SGS, Bureau Veritas, and LEEA-accredited certifiers.<\/p>\n

Whether you are a crane hire firm based in London, a lifting specialist serving the North Sea offshore sector from Aberdeen, a civil contractor running projects in the West Midlands, or an agricultural machinery dealer in East Anglia, we offer the same direct technical support, competitive pricing, and fast logistics regardless of order size. Send your enquiry to sales@boom-cylinders.com<\/a> and receive a formal quotation within one business day.<\/p>\n<\/div>\n

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Frequently Asked Questions<\/h2>\n

Common questions from UK crane operators, fleet engineers, and procurement managers<\/p>\n

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\nWhat is the typical lead time and price for supplying a main boom angle cylinder to a truck crane operator in the UK?\u2304<\/span><\/summary>\n
For the HCYY11112021 specifically, in-stock units can be despatched within 24 hours from our Bury St Edmunds facility. For custom-dimensioned cylinders, the production lead time is 6\u20138 weeks from drawing approval. Pricing is provided on application via a formal quotation \u2014 contact sales@boom-cylinders.com<\/a> with your machine model and quantity for a same-day cost estimate.<\/div>\n<\/details>\n
\nHow do I know if the HCYY11112021 main boom angle cylinder is compatible with my specific truck crane model operating on UK construction sites?\u2304<\/span><\/summary>\n
Compatibility is confirmed using three key dimensions: bore diameter (\u03a6280 mm), rod diameter (\u03a6250 mm), and installation distance (4,218 mm). If these match your existing cylinder’s envelope, the HCYY11112021 is a direct replacement. Where they differ, we offer custom sizing. Send us your OEM part number or a dimensional drawing and our engineers will confirm fitment within one working day.<\/div>\n<\/details>\n
\nWhich documentation is supplied with a main boom angle cylinder to support LOLER compliance for lifting operations in England and Scotland?\u2304<\/span><\/summary>\n
Every cylinder is supplied with: (1) material traceability certificates for barrel and rod stock; (2) hydrostatic test record signed by the quality inspector; (3) dimensional inspection report confirming bore and rod tolerances; (4) installation drawing with mounting dimensions; and (5) seal specification sheet. These documents are formatted to meet the evidence requirements most commonly requested by UK LOLER examination bodies and insurance engineers.<\/div>\n<\/details>\n
\nWhere can I find a reliable hydraulic boom angle cylinder supplier in the UK that offers competitive pricing and fast delivery for urgent crane repairs?\u2304<\/span><\/summary>\n
UK Ever-power Boom Cylinders Co., Ltd., headquartered in Bury St Edmunds, Suffolk, holds UK stock of selected high-demand models including the HCYY11112021 and offers same-day despatch via overnight carrier to all UK mainland postcodes. For urgent requirements, call or email our technical sales team and quote “URGENT CRANE DOWN” \u2014 we prioritise these enquiries and respond within two hours during normal business hours.<\/div>\n<\/details>\n
\nWhat is the maximum withstand pressure of the main boom angle cylinder and how does that affect safety margins for offshore lifting operations in the North Sea?\u2304<\/span><\/summary>\n
The HCYY11112021 is hydrostatically tested to its maximum withstand pressure of 39 MPa, which is 24% above the rated working pressure of 31.5 MPa. This margin accommodates transient pressure spikes associated with rapid valve actuation, dynamic wave-induced boom motion on jack-up vessels, and emergency load release scenarios common in North Sea operations. For offshore applications, we recommend specifying the optional stainless steel rod option \u2014 please enquire for pricing.<\/div>\n<\/details>\n
\nCan UK Ever-power supply a custom-dimensioned main boom angle cylinder when the standard HCYY11112021 does not match my crane’s original equipment specification?\u2304<\/span><\/summary>\n
Yes. Our factory routinely produces custom boom angle cylinders for bore diameters from 80 mm to 500 mm, with stroke lengths to 8,000 mm, to match OEM dimensional envelopes precisely. To initiate a custom order, supply either the OEM part number, a dimensional drawing, or physical measurements of the existing cylinder (bore, rod, stroke, installation distance, end fitting type). Our engineers will issue a formal custom quotation within two working days.<\/div>\n<\/details>\n<\/div>\n<\/div>\n

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Ready to Specify the HCYY11112021?<\/h3>\n

Contact our UK technical sales team \u2014 quotations issued within one business day.<\/p>\n

Get a Quote \u2014 sales@boom-cylinders.com<\/a><\/p>\n

UK Ever-power Boom Cylinders Co., Ltd. \u00a0|\u00a0 Bury St Edmunds, Suffolk IP32 7LX, UK \u00a0|\u00a0 sales@boom-cylinders.com | edit by gzl<\/p>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

Heavy-duty main boom angle cylinder HCYY11112021 \u2014 31.5MPa working pressure, 3507mm stroke. UK stock, fast delivery. Custom sizing available. Quote: sales@boom-cylinders.com<\/a><\/p>","protected":false},"featured_media":1542,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[1081],"product_tag":[],"class_list":["post-1535","product","type-product","status-publish","has-post-thumbnail","product_cat-cylinder-series-for-truck-cranes","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/boom-cylinders.com\/nl\/wp-json\/wp\/v2\/product\/1535","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/boom-cylinders.com\/nl\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/boom-cylinders.com\/nl\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/boom-cylinders.com\/nl\/wp-json\/wp\/v2\/comments?post=1535"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/boom-cylinders.com\/nl\/wp-json\/wp\/v2\/media\/1542"}],"wp:attachment":[{"href":"https:\/\/boom-cylinders.com\/nl\/wp-json\/wp\/v2\/media?parent=1535"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/boom-cylinders.com\/nl\/wp-json\/wp\/v2\/product_brand?post=1535"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/boom-cylinders.com\/nl\/wp-json\/wp\/v2\/product_cat?post=1535"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/boom-cylinders.com\/nl\/wp-json\/wp\/v2\/product_tag?post=1535"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}