{"id":3313,"date":"2026-06-22T08:06:17","date_gmt":"2026-06-22T08:06:17","guid":{"rendered":"https:\/\/www.pto-drive-shafts.com\/?post_type=product&p=3313"},"modified":"2026-06-22T09:28:45","modified_gmt":"2026-06-22T09:28:45","slug":"triangular-yoke","status":"publish","type":"product","link":"https:\/\/www.pto-drive-shafts.com\/el\/%cf%80%cf%81%ce%bf%cf%8a%cf%8c%ce%bd\/triangular-yoke\/","title":{"rendered":"Triangular Yoke"},"content":{"rendered":"
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PTO Drive Shafts \u203a Components \u203a Triangular Yoke<\/p>\n

Triangular Yoke for PTO Drive Shafts \u2014 Agricultural & Industrial Applications in the UK<\/h2>\n

High-precision triangular yoke connectors engineered for demanding British farming, construction, and industrial power transmission environments. Direct OEM-grade replacement parts supplied worldwide.<\/p>\n<\/div>\n<\/div>\n

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What Is a Triangular Yoke on a PTO Drive Shaft?<\/h2>\n

\"TriangularThe triangular yoke is a core structural component within a PTO drive shaft assembly, serving as the primary coupling element that transfers rotational torque between the tractor’s power take-off stub and the implement gearbox. Unlike round bore yokes, the triangular profile \u2014 also referred to as a trilobed or tri-lobe bore \u2014 provides a mechanical positive drive engagement, eliminating the risk of slippage under high-torque reversals that are common during tillage, baling, slurry pumping, and similar demanding UK farm operations. The geometry creates three contact points distributed equally around the inner bore, which distributes stress evenly and dramatically extends service life compared with older square or splined designs.<\/p>\n

British agricultural contractors and machinery dealers frequently specify PTO drive shaft triangular yoke components for their John Deere, New Holland, Massey Ferguson, and Claas tractor fleets. The component is produced in multiple series \u2014 from Series 1 through Series 10 \u2014 allowing fitment across virtually every torque class in the market, from compact 40 hp utility tractors up to high-output 350 hp+ row-crop machines. Our manufacturing facility maintains ISO 9001 certification and subjects every batch to dimensional inspection against DIN and CE standards before despatch.<\/p>\n

Precise bore tolerances on our triangular yokes ensure that field-replacement is straightforward \u2014 a quality that UK dealers and agricultural engineers consistently rate as a key purchasing criterion when sourcing spare PTO drive shaft components for the busy spring and harvest seasons.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Why UK Engineers Choose Our Triangular Yoke<\/h2>\n
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\u2699<\/div>\n

Positive Torque Transmission<\/h3>\n

The tri-lobe bore geometry creates zero-slip engagement. Peak torque reversals during PLC-controlled implement starts are absorbed without fretting or keyway wear, keeping downtime away from your operations.<\/p>\n<\/div>\n

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\ud83d\udee1<\/div>\n

Grade 45 Steel Construction<\/h3>\n

Forged from medium-carbon alloy steel, heat-treated to 28\u201332 HRC surface hardness, and phosphated against corrosion. Meets the rigorous demands of British weather \u2014 wet fields, salt air, and sub-zero mornings.<\/p>\n<\/div>\n

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\ud83d\udcc8<\/div>\n

Full Series Coverage<\/h3>\n

Series 1 through Series 10 (including 7N, 32, 36, and 38 sub-series) ensures one supplier can cover your entire fleet, reducing vendor count and simplifying your procurement process.<\/p>\n<\/div>\n

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\u2705<\/div>\n

CE & DIN Compliant<\/h3>\n

All triangular yokes leave our facility with full dimensional records and material certificates. UK importers can present these directly to their customers as part of CE-marked PTO shaft assembly documentation.<\/p>\n<\/div>\n

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\ud83d\ude9a<\/div>\n

Custom OEM Machining<\/h3>\n

Non-standard bore profiles, special flange patterns, and bespoke surface treatments available with MOQ as low as 50 pieces. Ideal for UK OEM machinery builders seeking a reliable long-term component partner.<\/p>\n<\/div>\n

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\ud83d\udd5b<\/div>\n

Fast Lead Times<\/h3>\n

Stock items typically ship within 3\u20135 working days ex-works. We hold safety stock across all common series, so UK dealers can promise quick turnaround even during the peak spring cultivation season.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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How It Works \u2014 Principle, Material & Application<\/h2>\n
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\u25b6 Working Principle<\/h3>\n

When a tractor PTO shaft rotates, it slots into the triangular bore of the yoke. The three flat faces of the triangular profile grip the matching stub profile and transmit torque through pure mechanical contact \u2014 no key, no bolt, no friction-dependent clamping. This geometry means the drive is inherently self-centering during engagement. Under load, each face shares the torque load equally, resulting in a lower peak contact stress per unit area compared to a two-flat or splined bore. The joint also accommodates minor angular misalignment through the universal joint cross that attaches to the yoke’s fork, allowing the shaft to flex between the tractor and implement across uneven UK terrain.<\/p>\n<\/div>\n

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\u25b6 Material Specification<\/h3>\n

The yoke body is forged from 45# medium-carbon steel or, for higher-stress series (Series 8 and above), 40Cr alloy steel. Raw forgings are normalised to relieve internal stresses, then machined on CNC turning centres to achieve bore tolerances within H7\/h6 limits. Bore and face surfaces are induction-hardened to 58\u201362 HRC where tri-lobe wear faces contact the shaft stub, while the core remains at 28\u201332 HRC to retain impact toughness. A phosphate-and-oil surface treatment provides baseline corrosion protection; optional hot-dip galvanising is available for coastal or high-humidity UK installations such as seafront estates or tidal flat reclamation projects.<\/p>\n<\/div>\n

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\u25b6 Application Scenarios<\/h3>\n

The triangular yoke is a standard fitment on farm machinery across England, Scotland, Wales, and Northern Ireland \u2014 from Yorkshire arable combines and Suffolk sugar beet harvesters to Cumbrian slurry tankers and Welsh hillside mower-conditioners. Beyond agriculture, the component appears in PTO-driven hydraulic pump packs on construction equipment, portable generators, wood chippers, and industrial mixers. Contractors who need to swap implements frequently favour the triangular profile because engagement and disengagement are faster and more reliable than some older proprietary coupling designs. UK hire-fleet operators also stock triangular yoke spares because self-service in-field replacement is practical without specialist tools.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Technical Specifications \u2014 Triangular Yoke (All Series)<\/h2>\n

All dimensions in millimetres. A = Inner bore width; B = Fork span; C = Overall length; D = Cross journal diameter.<\/p>\n

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\"Triangular<\/div>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u03a3\u03b5\u03b9\u03c1\u03ac<\/th>\nA (mm)<\/th>\nB (mm)<\/th>\nC (mm)<\/th>\n\u0394 (mm)<\/th>\n<\/tr>\n<\/thead>\n
1.06<\/td>\n22<\/td>\n54<\/td>\n77<\/td>\n32.4<\/td>\n<\/tr>\n
1.07<\/td>\n22<\/td>\n54<\/td>\n77<\/td>\n26.6<\/td>\n<\/tr>\n
2.06<\/td>\n23.8<\/td>\n61.3<\/td>\n82<\/td>\n36.1<\/td>\n<\/tr>\n
2.07<\/td>\n23.8<\/td>\n61.3<\/td>\n82<\/td>\n29<\/td>\n<\/tr>\n
3.06<\/td>\n27<\/td>\n70<\/td>\n90<\/td>\n43.4<\/td>\n<\/tr>\n
3.07<\/td>\n27<\/td>\n70<\/td>\n90<\/td>\n36.1<\/td>\n<\/tr>\n
4.06<\/td>\n27<\/td>\n74.6<\/td>\n90<\/td>\n43.4<\/td>\n<\/tr>\n
4.07<\/td>\n27<\/td>\n74.6<\/td>\n90<\/td>\n36.1<\/td>\n<\/tr>\n
5.06<\/td>\n30.2<\/td>\n80<\/td>\n98<\/td>\n51.3<\/td>\n<\/tr>\n
5.07<\/td>\n30.2<\/td>\n80<\/td>\n98<\/td>\n44.7<\/td>\n<\/tr>\n
32.06<\/td>\n32<\/td>\n76<\/td>\n98<\/td>\n51.3<\/td>\n<\/tr>\n
32.07<\/td>\n32<\/td>\n76<\/td>\n98<\/td>\n44.7<\/td>\n<\/tr>\n
6.06<\/td>\n30.2<\/td>\n92<\/td>\n104<\/td>\n53.6<\/td>\n<\/tr>\n
6.07<\/td>\n30.2<\/td>\n92<\/td>\n104<\/td>\n44.7<\/td>\n<\/tr>\n
7.06<\/td>\n30.2<\/td>\n106.5<\/td>\n117<\/td>\n53.6<\/td>\n<\/tr>\n
7.07<\/td>\n30.2<\/td>\n106.5<\/td>\n117<\/td>\n44.7<\/td>\n<\/tr>\n
7N.06<\/td>\n35<\/td>\n94<\/td>\n106<\/td>\n53.6<\/td>\n<\/tr>\n
7N.07<\/td>\n35<\/td>\n94<\/td>\n106<\/td>\n44.7<\/td>\n<\/tr>\n
36.06<\/td>\n36<\/td>\n89<\/td>\n106<\/td>\n53.6<\/td>\n<\/tr>\n
36.07<\/td>\n36<\/td>\n89<\/td>\n106<\/td>\n44.7<\/td>\n<\/tr>\n
8.06<\/td>\n35<\/td>\n106.5<\/td>\n121<\/td>\n62.7<\/td>\n<\/tr>\n
8.07<\/td>\n35<\/td>\n106.5<\/td>\n121<\/td>\n53.6<\/td>\n<\/tr>\n
38.06<\/td>\n38<\/td>\n105.6<\/td>\n121<\/td>\n62.7<\/td>\n<\/tr>\n
38.07<\/td>\n38<\/td>\n105.6<\/td>\n121<\/td>\n53.6<\/td>\n<\/tr>\n
9.06<\/td>\n41<\/td>\n108<\/td>\n130<\/td>\n62.7<\/td>\n<\/tr>\n
9.07<\/td>\n41<\/td>\n108<\/td>\n130<\/td>\n53.6<\/td>\n<\/tr>\n
10.06<\/td>\n41<\/td>\n118<\/td>\n125<\/td>\n62.7<\/td>\n<\/tr>\n
10.07<\/td>\n41<\/td>\n118<\/td>\n125<\/td>\n53.6<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

* Tolerances: bore +0 \/ -0.1 mm. Custom dimensions on request. Contact us for non-standard series availability.<\/p>\n<\/div>\n

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Compatible PTO Drive Shaft Series<\/h2>\n

The triangular yoke is engineered to integrate seamlessly with our four core PTO drive shaft lines. Each series is designed for a different torque class and application environment.<\/p>\n

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

A versatile, general-purpose shaft series suited for standard-duty agricultural implements. Compact design with robust yoke engagement \u2014 ideal for rotary mowers, spreaders, and compact tractor attachments across the UK.<\/p>\n<\/div>\n

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

A safety-enhanced shaft series featuring a friction clutch or shear bolt overload protection. The triangular yoke connection ensures clean engagement while the clutch prevents drive-train damage during sudden blockages, popular with UK arable contractors.<\/p>\n<\/div>\n

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

Extended-length configurations designed to accommodate wider implement-to-tractor distances. The tri-lobe yoke connection maintains alignment integrity at full extension, making this series a favourite for wide-span cultivators and trailed sprayers in large UK fields.<\/p>\n<\/div>\n

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

High-torque series built for demanding applications such as heavy disc harrows, stump grinders, and industrial PTO pump systems. Paired with heavy-duty triangular yokes from Series 8 upward, this shaft handles peak shock loads without joint failure.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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

Our dedicated production facility runs 24 CNC machining centres and 8 forging press lines, giving us the capacity to handle both high-volume blanket orders and bespoke single-series runs. UK OEM partners regularly call on our engineering team to develop non-standard triangular yoke profiles \u2014 modified fork spacing, altered yoke arms, or surface treatments such as hard chrome plating, black oxide, or Geomet coating for aggressive environments. Every custom project is assigned a dedicated applications engineer who manages tolerancing, prototyping, and first-article inspection before volume production begins.<\/p>\n

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\"PTO<\/div>\n
\"PTO<\/div>\n<\/div>\n
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18+<\/p>\n

Years manufacturing PTO components<\/p>\n<\/div>\n

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30+<\/p>\n

Series covered, MOQ from 50 pcs<\/p>\n<\/div>\n

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ISO 9001<\/p>\n

Certified quality management system<\/p>\n<\/div>\n

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CE \/ DIN<\/p>\n

Full compliance documentation supplied<\/p>\n<\/div>\n<\/div>\n

\u2709 Get a Quote \u2014 sales@pto-drive-shafts.com<\/a><\/div>\n<\/div>\n

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Customer Success Case Study<\/h2>\n

UK agricultural machinery dealers and industrial manufacturers choose our triangular yoke components for measurable results in the field.<\/p>\n

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Case Study \u2022 UK Agricultural Machinery Dealer<\/p>\n

Lincolnshire Arable Contractor Reduces PTO Shaft Downtime by 62%<\/h3>\n

Background:<\/strong> A mid-sized arable contracting business in Lincolnshire, operating a mixed fleet of 12 tractors ranging from 90 hp to 280 hp, was experiencing recurring failures of triangular yoke components on their flail mulchers and cultivator wings during the spring drilling season. Downtime incidents averaged 3\u20134 per week, costing approximately \u00a3400\u2013\u00a3600 per callout in parts and lost productivity. The existing supplier could not guarantee delivery within 48 hours for the less common Series 7N and Series 32 sizes.<\/p>\n

\u0394\u03b9\u03ac\u03bb\u03c5\u03bc\u03b1:<\/strong> After a technical review, the contractor switched their approved spares supplier to us. We agreed a consignment stock arrangement covering all triangular yoke<\/a> series in use across the fleet, housed in their workshop. The contractor also requested a minor surface change \u2014 zinc-phosphate undercoat plus an agricultural-grade wax topcoat \u2014 to handle the wet clay conditions typical of the Lincolnshire fens. We produced the modified parts within three weeks on a 200-piece MOQ.<\/p>\n

\u0391\u03c0\u03bf\u03c4\u03ad\u03bb\u03b5\u03c3\u03bc\u03b1:<\/strong> Over the following 12-month period, PTO shaft-related downtime incidents fell by 62%. The field team reported that engagement and disengagement were noticeably smoother, and no premature bore wear was recorded even on shafts running at continuous 540 rpm for 8-hour shifts. Annual parts spend fell by an estimated 28% due to longer service intervals.<\/p>\n<\/div>\n

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\u201c<\/p>\n

We sourced Series 5 and Series 6 triangular yokes for our slurry tanker \u0386\u03be\u03bf\u03bd\u03b5\u03c2 PTO<\/a>. Fit was perfect straight from the box. No modification needed, and the surface finish is noticeably better than our previous Chinese supplier. We’ve reordered three times this year already.<\/p>\n

James H.<\/p>\n

Agricultural Engineering Depot, Yorkshire, UK<\/p>\n<\/div>\n

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\u201c<\/p>\n

As a machinery importer supplying Scottish hire-fleet operators, I need guaranteed dimensions and rapid delivery. These triangular yoke components have both. The material certificates were provided without being asked, which made CE documentation for our customers a much smoother process.<\/p>\n

Fiona M.<\/p>\n

Agricultural Machinery Importer, Aberdeen, Scotland<\/p>\n<\/div>\n

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\u201c<\/p>\n

We build bespoke PTO-driven pump units for water treatment and construction site dewatering in the Midlands. Series 8 and 9 triangular yokes handle the shock-loading well, even when the pumps start against a full head. We requested a custom bore width and they turned around a prototype within two weeks.<\/p>\n

Robert C.<\/p>\n

Pump Systems Manufacturer, Birmingham, UK<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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\u03a3\u03c5\u03c7\u03bd\u03ad\u03c2 \u03b5\u03c1\u03c9\u03c4\u03ae\u03c3\u03b5\u03b9\u03c2<\/h2>\n
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\n\u25bc What is the best triangular yoke series for a 100 hp tractor used in UK arable farming?<\/summary>\n

For a 100 hp tractor running standard arable implements in the UK, Series 5 or Series 6 triangular yokes are typically the correct specification. Series 5 covers shafts up to approximately 65 Nm continuous torque, while Series 6 steps up for heavier cultivator or baler duties. We recommend confirming with your shaft manufacturer’s torque rating chart before ordering.<\/p>\n<\/details>\n<\/div>\n

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\n\u25bc How much does it cost to buy replacement triangular yoke components for PTO drive shafts in the UK and what is the minimum order quantity?<\/summary>\n

Pricing varies by series, surface treatment, and order volume. Standard series yokes are available from MOQ 50 pieces with competitive per-unit pricing. For an accurate quote tailored to your specific series mix and annual volume, email sales@pto-drive-shafts.com. UK buyers typically receive a detailed quotation within 24 working hours.<\/p>\n<\/details>\n<\/div>\n

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\n\u25bc Which triangular yoke profile is compatible with New Holland and Massey Ferguson tractor PTO stubs commonly used on UK farms?<\/summary>\n

Most New Holland and Massey Ferguson tractors in the UK use a 1-3\/8 inch six-spline or 21-spline PTO stub. The triangular yoke sits on the implement-side shaft tube, so selection depends on the implement gearbox input torque class rather than the tractor brand. Our team can cross-reference your implement model to the correct yoke series.<\/p>\n<\/details>\n<\/div>\n

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\n\u25bc Where can I find a reliable supplier of PTO drive shaft triangular yoke parts that ships to dealers across England, Scotland, and Wales?<\/summary>\n

PTO-Drive-Shafts.com ships triangular yoke components to agricultural dealers, machinery importers, and OEM manufacturers throughout the UK. We stock all major series and offer consolidated shipments to reduce freight costs for regular B2B buyers in England, Scotland, Wales, and Northern Ireland.<\/p>\n<\/details>\n<\/div>\n

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\n\u25bc When should I replace the triangular yoke on a PTO drive shaft and what are the signs of wear on UK construction site applications?<\/summary>\n

Replace the triangular yoke when you notice rotational play when hand-turning the shaft, visible bore face cracking or spalling, increased vibration during use, or difficulty sliding the shaft tube onto the yoke stub. On UK construction sites with high shock-load cycles, inspect every 250 hours and replace at signs of 1\u20132 mm play or visible metal fatigue.<\/p>\n<\/details>\n<\/div>\n

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\n\u25bc How do I get a price quote for custom PTO drive shaft triangular yokes with non-standard bore dimensions from a UK-export-ready manufacturer?<\/summary>\n

Email sales@pto-drive-shafts.com with your bore profile dimensions (A, B, C, D), material grade preference, surface treatment, estimated annual volume, and any certification requirements. Our engineering team reviews all custom enquiries within one business day and provides a technical review alongside a commercial quotation.<\/p>\n<\/details>\n<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

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Ready to Source Triangular Yoke Components for Your UK Operation?<\/h2>\n

Send us your series requirement, quantity, and any custom specifications. We respond within 24 hours with a detailed quote and lead time confirmation.<\/p>\n

\u2709 Get a Quote Now<\/a><\/p>\n

sales@pto-drive-shafts.com \u2022 ISO 9001 Certified \u2022 CE Compliant \u2022 UK Export Ready \u00b7 edit by gzl<\/p>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

Forged steel triangular yoke for PTO drive shafts. Tri-lobe bore, zero-slip torque transfer. Series 1\u201310. CE\/DIN<\/p>","protected":false},"featured_media":3314,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[1799],"product_tag":[],"class_list":["post-3313","product","type-product","status-publish","has-post-thumbnail","product_cat-yoke","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/www.pto-drive-shafts.com\/el\/wp-json\/wp\/v2\/product\/3313","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.pto-drive-shafts.com\/el\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.pto-drive-shafts.com\/el\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pto-drive-shafts.com\/el\/wp-json\/wp\/v2\/comments?post=3313"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.pto-drive-shafts.com\/el\/wp-json\/wp\/v2\/media\/3314"}],"wp:attachment":[{"href":"https:\/\/www.pto-drive-shafts.com\/el\/wp-json\/wp\/v2\/media?parent=3313"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.pto-drive-shafts.com\/el\/wp-json\/wp\/v2\/product_brand?post=3313"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.pto-drive-shafts.com\/el\/wp-json\/wp\/v2\/product_cat?post=3313"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.pto-drive-shafts.com\/el\/wp-json\/wp\/v2\/product_tag?post=3313"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}