{"id":3276,"date":"2026-06-18T05:08:34","date_gmt":"2026-06-18T05:08:34","guid":{"rendered":"https:\/\/www.pto-drive-shafts.com\/?post_type=product&p=3276"},"modified":"2026-06-18T05:40:29","modified_gmt":"2026-06-18T05:40:29","slug":"triangular-tube","status":"publish","type":"product","link":"https:\/\/www.pto-drive-shafts.com\/es\/producto\/triangular-tube\/","title":{"rendered":"Triangular Tube"},"content":{"rendered":"
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PTO Drive Shafts \u00b7 Power Transmission Components<\/p>\n

Triangular Tube for PTO Drive Shafts<\/span><\/h2>\n

Precision-engineered triangular profile tubes designed for demanding UK agricultural and industrial PTO driveline applications \u2014 delivering consistent torque transfer, extended service life, and full Series 1\u20139 coverage.<\/p>\n

Get a Quote \u2014 sales@pto-drive-shafts.com<\/a><\/p>\n<\/div>\n

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What Is a PTO Triangular Tube?<\/h2>\n

\"PTOThe triangular tube is a core telescoping component within a PTO drive shaft assembly. Its three-lobed cross-sectional profile \u2014 machined from high-grade structural steel \u2014 allows the outer and inner tubes to slide axially while transmitting rotational torque without slippage. Unlike round or star-profile tubes, the triangular geometry offers a precise balance between torsional rigidity and smooth telescoping travel, making it particularly well-suited to the variable-length demands of UK tractor-implement connections across uneven terrain. Whether fitted to a compact 30 hp vineyard tractor or a 200 hp arable unit driving a heavy-duty flail mower, the triangular tube absorbs length changes in the driveline without interrupting power flow.<\/p>\n

On our pto-drive-shafts.com platform we supply triangular tubes across Series 1 through Series 9, covering cross kits from T1 (54 mm length, 22 mm pin diameter) all the way to T9 (108 mm length, 41 mm pin diameter). Each series pairs a defined outer tube profile with a matching inner tube profile, giving you a fully engineered sliding fit with controlled clearance tolerances that meet ISO 8210 driveline standards.<\/p>\n<\/div>\n<\/div>\n

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Request a Quote Now<\/a><\/div>\n<\/div>\n

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Why UK Operators Choose Our Triangular Tubes<\/h2>\n
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Precise Three-Lobe Profile<\/h3>\n

The equilateral triangular cross-section ensures uniform load distribution across all three contact faces, dramatically reducing fretting wear compared to two-face splined profiles.<\/p>\n<\/div>\n

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High-Grade Steel Construction<\/h3>\n

Cold-drawn from low-alloy structural steel (equivalent to S355J2 \/ EN10025), each tube undergoes surface hardening treatments to achieve case hardness in the 58\u201362 HRC range at contact lobes, ensuring longevity under sustained farm use in UK conditions.<\/p>\n<\/div>\n

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Full Series 1\u20139 Coverage<\/h3>\n

From the compact Series 1 (outer 32.4 mm) through to the heavy-duty Series 9 (outer 62.7 mm), we hold inventory across all nine series \u2014 meaning you can source replacement triangular tubes for virtually any branded PTO shaft on the UK market without waiting weeks for imports.<\/p>\n<\/div>\n

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Drop-In Cross Kit Compatibility<\/h3>\n

Every tube series aligns with a designated cross kit (T1\u2013T9), so field engineers can replace worn yoke assemblies and cross kits at the same time as the tube without needing custom measurements or machining work on-site.<\/p>\n<\/div>\n

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Custom Length & Coating Options<\/h3>\n

We offer cut-to-length supply, yellow zinc phosphate coating, and special-order galvanising for high-moisture UK environments. OEM branding and private-label packaging are available for agricultural equipment distributors across England, Scotland, and Wales.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Technical Specification \u2014 Triangular Tube Series 1\u20139<\/h2>\n

All dimensions in millimetres (mm). Cross-section wall thickness and circumscribed diameter measured at lobe apex.<\/p>\n

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Technical drawing \u2014 Triangular Tube outer\/inner cross-section dimensions (Series 1\u20139)<\/p>\n<\/div>\n<\/div>\n

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Material, Working Principle & Application Scenarios<\/h2>\n
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\u2699 Material & Surface Treatment<\/h3>\n

Tubes are cold-drawn from low-alloy carbon steel conforming to EN 10025 S355 specification. The cold-drawing process refines the grain structure and produces a smooth bore finish that reduces telescoping friction without additional lubrication in moderate-duty applications. Contact lobes receive induction hardening to 58\u201362 HRC. External surfaces are finished with yellow zinc phosphate passivation as standard; hot-dip galvanising is available on request for coastal or high-humidity UK farm environments such as those found across the Somerset Levels or the Fens of Lincolnshire.<\/p>\n<\/div>\n

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\ud83d\udd04 Working Principle<\/h3>\n

During operation the tractor PTO shaft rotates at 540 rpm or 1000 rpm. The rotational force is carried through the universal joint cross kit, into the outer triangular tube, and transmitted to the inner tube via the three-lobe mating faces. When the implement oscillates vertically \u2014 for example as a disc harrow crosses a furrow \u2014 the inner tube slides within the outer tube, changing the effective driveline length without breaking torque continuity. The triangular profile prevents relative rotation between the two tubes while permitting this axial travel, functioning as both a torque key and a sliding spline in a single geometry.<\/p>\n<\/div>\n

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\ud83c\udf3e Application Scenarios in the UK<\/h3>\n

The triangular tube is found in PTO shafts driving a wide range of implements across UK agriculture and industry. Typical applications include rotary mowers on grass farms in the Yorkshire Dales, slurry pump drives on dairy units in Wales and the South West, baler drives on cereal farms in East Anglia, and woodchipper PTOs used by forestry contractors in Scotland. Industrial applications include concrete mixer drums at ready-mix plants, hydraulic pump drives on mobile plant, and auger drives in grain storage facilities. Series 5\u20139 tubes are frequently specified for contractor-grade equipment where peak torques exceed 3,000 Nm.<\/p>\n<\/div>\n<\/div>\n

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Complete PTO Drive Shaft Range<\/h2>\n

The triangular tube is a replacement or build component used within any of our four main PTO drive shaft series. Each series targets a distinct power and application band:<\/p>\n

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PTO Drive Shaft G Series<\/h3>\n

General-purpose series for light-to-medium agricultural implements. Ideal for rotary mowers, fertiliser spreaders, and seeders on UK farms.<\/p>\n

View G Series \u203a<\/span><\/a><\/p>\n

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PTO Drive Shaft S Series<\/h3>\n

Heavy-duty S Series built for contractor use with reinforced yokes and high torque ratings. Common on balers, chipper-shredders, and slurry equipment.<\/p>\n

View S Series \u203a<\/span><\/a><\/p>\n

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PTO Drive Shaft L Series<\/h3>\n

Extended-length L Series for wider implements and longer tractor-implement spacing. Well-suited to trailed equipment and specialist horticultural machinery in the UK.<\/p>\n

View L Series \u203a<\/span><\/a><\/p>\n

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PTO Drive Shaft T Series<\/h3>\n

T Series targets industrial and municipal applications, offering enhanced corrosion resistance and wider operating temperature ranges for non-agricultural PTO-powered machinery.<\/p>\n

View T Series \u203a<\/span><\/a><\/p>\n<\/div>\n<\/div>\n

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

Our manufacturing facility operates cold-drawing lines, CNC profile-grinding centres, and induction hardening cells under a single roof, enabling us to offer a degree of customisation that few triangular tube suppliers in the UK market can match. From low-MOQ prototype runs for equipment OEMs developing new implements, through to high-volume contract supply for UK agricultural dealers, we tailor wall thickness, temper grade, tube length, surface treatment, and paired cross kit specification to your exact design requirements. ISO 9001:2015-certified production and in-house CMM verification ensure every batch ships to drawing.<\/p>\n

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\u2713 Custom Options Available<\/h3>\n