{"id":3309,"date":"2026-06-22T07:47:49","date_gmt":"2026-06-22T07:47:49","guid":{"rendered":"https:\/\/www.pto-drive-shafts.com\/?post_type=product&p=3309"},"modified":"2026-06-22T09:29:07","modified_gmt":"2026-06-22T09:29:07","slug":"star-yoke","status":"publish","type":"product","link":"https:\/\/www.pto-drive-shafts.com\/it\/prodotto\/star-yoke\/","title":{"rendered":"Star Yoke"},"content":{"rendered":"
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PTO Drive Shaft Components \u2014 United Kingdom<\/p>\n

Star Yoke for Agricultural & Industrial PTO Drive Shaft Applications<\/h2>\n

The star yoke is one of the most mechanically critical components within any PTO drive shaft assembly. Engineered to transmit high torque reliably under continuous agricultural and industrial operating conditions across the UK market, our star yokes deliver dimensional precision, superior metallurgical integrity, and long service intervals \u2014 even in demanding field environments.<\/p>\n

\ud83d\udce7 Request a Quote<\/a><\/p>\n<\/div>\n<\/div>\n

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What Is a Star Yoke and Why Does It Matter?<\/h2>\n

\"StarA star yoke \u2014 sometimes referred to as a spider yoke or cross yoke \u2014 forms the connecting interface between the universal joint cross (spider) and the main shaft tube within a PTO drive shaft assembly. The component’s four-lug geometry distributes rotational forces evenly around the joint centre, which is what makes it so central to smooth, vibration-free power transfer. When a star yoke wears prematurely or is manufactured to loose tolerances, the entire drivetrain suffers: bearing seats become oval, the spider cross tilts under load, and driveline vibration escalates rapidly. Choosing a precision-machined star yoke from a verified supplier is therefore not a minor procurement decision \u2014 it is fundamental to both equipment longevity and operator safety across the UK’s agricultural and light-industrial sectors.<\/p>\n

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

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Why UK Operators Choose Our Star Yokes<\/h2>\n

Backed by 18+ years of PTO drivetrain engineering<\/p>\n

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Precision-Machined Geometry<\/h3>\n

Each star yoke is CNC-machined to tight dimensional tolerances on the bearing cup seats, lug width, and bore diameter. This ensures a controlled interference fit with the spider cross bearing cups, eliminating play that leads to vibration and accelerated wear in field conditions.<\/p>\n<\/div>\n

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\ud83d\udd31<\/div>\n

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

Manufactured from case-hardened alloy steel with a carburised surface layer, our star yokes resist impact fatigue and surface pitting under the cyclic torque reversals typical of PTO-driven implements. The core retains sufficient toughness to absorb shock loads without brittle fracture.<\/p>\n<\/div>\n

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Wide Series Compatibility<\/h3>\n

With 20 standard series configurations \u2014 from the compact 6.06ST through to the heavy-duty 50.07ST \u2014 our star yoke range covers the majority of agricultural tractor PTO shafts operating at 540 RPM and 1000 RPM across UK farms, from arable operations in East Anglia to livestock units in the Welsh borders.<\/p>\n<\/div>\n

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\ud83d\udd12<\/div>\n

Corrosion-Resistant Finish<\/h3>\n

A zinc phosphate and oil surface treatment protects against the high-humidity, muddy working environments common across British farmland and light industrial sites. This finish slows rust initiation significantly during storage and seasonal downtime, preserving dimensional integrity until installation.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Material Composition & Working Principle<\/h2>\n

The star yoke operates on the principle of rigid moment transfer: it clamps mechanically around the outer diameter of the PTO shaft<\/a> tube (or slides over a splined stub) while its four lug arms present precision-bored cup seats to the bearing needles of the spider cross. As the driveshaft rotates, the yoke transmits torque through the spider cross to the mating yoke at the other end of the universal joint, allowing angular misalignment between tractor and implement \u2014 typically up to 15\u00b0 to 25\u00b0 depending on series \u2014 without interrupting power flow. The star geometry ensures that the torque load path divides equally between four bearing cups, keeping unit bearing pressure within safe limits even at rated torque.<\/p>\n

Material-wise, the body is forged from 20CrMnTi or equivalent low-alloy case-hardening steel. Post-forging, components undergo carburising at 920\u00b0C, quenching, and low-temperature tempering to achieve a surface hardness of 58\u201362 HRC with a core hardness of 30\u201342 HRC. This dual-hardness profile is what allows the star yoke to handle shock torque spikes \u2014 such as those generated when a rotary mower strikes a concealed stone \u2014 without yielding or fracturing.<\/p>\n

Dimensional quality is verified through CMM (coordinate measuring machine) inspection of bearing seat diameters, lug parallelism, and bore run-out. Each production batch includes hardness testing and magnetic particle inspection to detect sub-surface cracks before parts leave the factory. This level of process control is what distinguishes a professional-grade star yoke supplier from catalogue resellers operating in the UK market.<\/p>\n<\/div>\n

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Typical Application Scenarios<\/h3>\n
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\ud83c\udf3f Arable Farming (UK)<\/p>\n

Mowers, balers, seed drills, fertiliser spreaders \u2014 all driven by PTO shafts requiring robust star yokes to handle seasonal peak torque.<\/p>\n<\/div>\n

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\ud83d\udd27 Industrial Machinery<\/p>\n

Wood chippers, hydraulic pump drives, and compactor units in construction and waste-processing sectors across England, Scotland, and Wales.<\/p>\n<\/div>\n

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\ud83d\ude97 Groundscare & Turf Management<\/p>\n

Golf courses, sports stadiums, and council maintenance fleets across UK urban and peri-urban zones rely on PTO-driven gang mowers and aerators year-round.<\/p>\n<\/div>\n

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\ud83d\udd54 OEM Driveshaft Assembly<\/p>\n

UK-based and European OEM manufacturers sourcing replacement and production-line PTO components for branded drivetrain assemblies.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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Technical Specifications \u2014 Star Yoke Series<\/h2>\n

All dimensions in millimetres. A = Bore diameter; B = Lug width (yoke ear span); C = Outside width across ears; D = Bearing cup seat diameter.<\/p>\n

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Serie<\/th>\nA (mm)<\/th>\nB (mm)<\/th>\nC (mm)<\/th>\nD (mm)<\/th>\n<\/tr>\n<\/thead>\n
6.06ST<\/td>\n30.2<\/td>\n92<\/td>\n104<\/td>\n56.8<\/td>\n<\/tr>\n
6.07ST<\/td>\n30.2<\/td>\n92<\/td>\n104<\/td>\n47.4<\/td>\n<\/tr>\n
7.06ST<\/td>\n30.2<\/td>\n106.5<\/td>\n117<\/td>\n56.8<\/td>\n<\/tr>\n
7.07ST<\/td>\n30.2<\/td>\n106.5<\/td>\n117<\/td>\n47.4<\/td>\n<\/tr>\n
8.06ST<\/td>\n35<\/td>\n106.5<\/td>\n121<\/td>\n56.8<\/td>\n<\/tr>\n
8.07ST<\/td>\n35<\/td>\n106.5<\/td>\n121<\/td>\n47.4<\/td>\n<\/tr>\n
7N.06ST<\/td>\n35<\/td>\n94<\/td>\n106<\/td>\n56.8<\/td>\n<\/tr>\n
7N.07ST<\/td>\n35<\/td>\n94<\/td>\n106<\/td>\n47.4<\/td>\n<\/tr>\n
32.06ST<\/td>\n32<\/td>\n76<\/td>\n98<\/td>\n56.8<\/td>\n<\/tr>\n
32.07ST<\/td>\n32<\/td>\n76<\/td>\n98<\/td>\n47.4<\/td>\n<\/tr>\n
36.06ST<\/td>\n36<\/td>\n89<\/td>\n106<\/td>\n56.8<\/td>\n<\/tr>\n
36.07ST<\/td>\n36<\/td>\n89<\/td>\n106<\/td>\n47.4<\/td>\n<\/tr>\n
9.06ST<\/td>\n41<\/td>\n108<\/td>\n130<\/td>\n67.5<\/td>\n<\/tr>\n
9.07ST<\/td>\n41<\/td>\n108<\/td>\n130<\/td>\n56.8<\/td>\n<\/tr>\n
10.06ST<\/td>\n41<\/td>\n118<\/td>\n125<\/td>\n67.5<\/td>\n<\/tr>\n
10.07ST<\/td>\n41<\/td>\n118<\/td>\n125<\/td>\n56.8<\/td>\n<\/tr>\n
42.06ST<\/td>\n42<\/td>\n104.5<\/td>\n130<\/td>\n67.5<\/td>\n<\/tr>\n
42.07ST<\/td>\n42<\/td>\n104.5<\/td>\n130<\/td>\n56.8<\/td>\n<\/tr>\n
50.06ST<\/td>\n50<\/td>\n118<\/td>\n133<\/td>\n67.5<\/td>\n<\/tr>\n
50.07ST<\/td>\n50<\/td>\n118<\/td>\n133<\/td>\n56.8<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

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

The star yoke is just one element of a full PTO drive shaft assembly. Our four main shaft series are engineered as complete systems, with star yokes, spider kits, guard tubes, and coupling elements matched for rated torque capacity. Whether you’re a machinery dealer sourcing replacement components or an OEM engineer specifying full driveline assemblies, these series give you a structured choice by duty level and application type.<\/p>\n

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\ud83d\udd17<\/p>\n

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

General-purpose series designed for light to medium agricultural implements. Ideal for mowers, spreaders, and seeders where weight economy and cost-effectiveness are the primary considerations.<\/p>\n<\/div>\n

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\ud83d\udd17<\/p>\n

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

The S Series introduces reinforced yoke arms and upgraded surface treatment, making it the preferred choice for medium-duty implements including balers and rotary tillers operating in high-hour UK farm environments.<\/p>\n<\/div>\n

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\ud83d\udd17<\/p>\n

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

Extended-length configurations optimised for applications where greater operating angles or longer between-centre distances are required \u2014 particularly suited to front-mounted PTO implements and compact utility tractors.<\/p>\n<\/div>\n

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\ud83d\udd17<\/p>\n

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

The T Series is our heavy-duty flagship, engineered for high-torque applications such as wood chippers, stump grinders, and large rotary cutters. Forged yoke arms and wide-series bearing configurations make this the right choice where failure consequences are highest.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Our Manufacturing Capability & Custom Star Yoke Solutions<\/h2>\n
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Our production facility operates CNC turning centres, gear hobbing machines, carburising furnaces, and CMM inspection rooms under one roof. This integrated manufacturing model \u2014 combined with an in-house tooling team \u2014 means we can accommodate non-standard star yoke dimensions, bespoke bore profiles, and modified lug geometries within short lead times. UK distributors and OEM machinery builders regularly rely on us for low-MOQ prototype batches through to full-scale production runs, with drawings reviewed and confirmed before any material is cut.<\/p>\n

Custom services cover: non-standard A\/B\/C\/D dimensions; modified yoke lug thickness for high-angle applications; special bore profiles (splined, keyed, or smooth bore with set-screw pockets); alternative surface treatments including hot-dip galvanising for marine and coastal environments; and OEM laser or stamping marking for traceability requirements.<\/p>\n

Get a Quote for Custom Star Yokes<\/a><\/p>\n<\/div>\n

\"PTO<\/div>\n<\/div>\n<\/div>\n

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Customer Success Stories<\/h2>\n

How UK and European operators have benefited from our star yoke components<\/p>\n

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Case Study \u2014 UK Arable Contractor, Lincolnshire<\/p>\n

Reducing Mid-Season PTO Shaft Failures During Harvest<\/h3>\n

A large arable contracting business operating twelve combine-support machines and three self-propelled forage harvesters across Lincolnshire and South Yorkshire was experiencing recurring star yoke failures during peak harvest \u2014 typically around 300 to 400 operating hours into the season. The root cause traced back to underspecified catalogue yokes with inconsistent bearing seat hardness. After switching to our 9.06ST series star yokes across their PTO-driven grain auger carts, zero in-field failures were recorded across the following two harvest seasons. The contractor reported estimated savings of over \u00a318,000 in avoided downtime costs and emergency part airfreight fees in the first year alone.<\/p>\n

\"PTO<\/p>\n

Industry: Arable Contracting | Location: Lincolnshire, UK | Component: 9.06ST Star Yoke<\/p>\n<\/div>\n

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\u2605\u2605\u2605\u2605\u2605<\/p>\n

“We’ve been sourcing star yoke<\/a>s from this supplier for three seasons now. The dimensional consistency across batches is noticeably better than what we were getting from our previous source. No more shimming required at assembly \u2014 they fit correctly the first time.”<\/p>\n

James H. \u2014 Agricultural Machinery Dealer, Yorkshire, UK<\/p>\n<\/div>\n

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\u2605\u2605\u2605\u2605\u2605<\/p>\n

“We produce a compact wood chipper range and needed a reliable OEM star yoke supplier. The custom boring option let us specify the exact shaft fit we needed. Lead time from approved drawing to first batch delivery was under six weeks.”<\/p>\n

Stefan M. \u2014 OEM Machinery Manufacturer, Bavaria, Germany<\/p>\n<\/div>\n

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\u2605\u2605\u2605\u2605\u2605<\/p>\n

“I manage PTO driveshaft stock for a parts distributor covering Scotland. The range coverage is excellent \u2014 we can supply most common agricultural series from a single supplier, which really simplifies our stock management and reduces freight costs.”<\/p>\n

Callum F. \u2014 Agricultural Parts Distributor, Perth, Scotland<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Ready to Source Star Yokes for Your UK Operation?<\/h2>\n

Send us your series reference, required quantity, and any custom specifications. Our engineering team responds to UK and EU enquiries within one business day.<\/p>\n

\u2709 Get a Quote \u2014 sales@pto-drive-shafts.com<\/a><\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

PTO drive shaft star yoke supplier UK \u2014 forged alloy steel, CNC-machined, 20 series (6.06ST to 50.07ST). Custom bore & OEM batches available.<\/p>","protected":false},"featured_media":3310,"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-3309","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\/it\/wp-json\/wp\/v2\/product\/3309","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.pto-drive-shafts.com\/it\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.pto-drive-shafts.com\/it\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pto-drive-shafts.com\/it\/wp-json\/wp\/v2\/comments?post=3309"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.pto-drive-shafts.com\/it\/wp-json\/wp\/v2\/media\/3310"}],"wp:attachment":[{"href":"https:\/\/www.pto-drive-shafts.com\/it\/wp-json\/wp\/v2\/media?parent=3309"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.pto-drive-shafts.com\/it\/wp-json\/wp\/v2\/product_brand?post=3309"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.pto-drive-shafts.com\/it\/wp-json\/wp\/v2\/product_cat?post=3309"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.pto-drive-shafts.com\/it\/wp-json\/wp\/v2\/product_tag?post=3309"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}