{"id":3354,"date":"2026-06-24T05:41:43","date_gmt":"2026-06-24T05:41:43","guid":{"rendered":"https:\/\/www.pto-drive-shafts.com\/?post_type=product&p=3354"},"modified":"2026-06-24T05:47:25","modified_gmt":"2026-06-24T05:47:25","slug":"plain-bore-yoke-d-keyway-clamp-bolt","status":"publish","type":"product","link":"https:\/\/www.pto-drive-shafts.com\/fi\/tuote\/plain-bore-yoke-d-keyway-clamp-bolt\/","title":{"rendered":"Plain Bore Yoke D-Keyway & Clamp Bolt"},"content":{"rendered":"
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PTO Drive Shaft Components \u00a0|\u00a0 UK Industrial Supply<\/p>\n

Plain Bore Yoke \u2014 D-Keyway & Clamp Bolt<\/h2>\n

Precision-machined PTO yoke with D-keyway profile and dual clamp bolt retention \u2014 engineered for agricultural, construction, and industrial drive shaft assemblies across the United Kingdom.<\/p>\n

\u2709\u00a0 Get a Quote Now<\/a><\/p>\n<\/div>\n<\/div>\n

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What Makes This Yoke Different<\/h2>\n

\"PlainThe Plain Bore Yoke with D-Keyway and Clamp Bolt is a core connection component in modern PTO drive shaft systems. Unlike standard round-bore yokes, the D-shaped keyway profile ensures a precise angular lock between the yoke and the shaft, completely eliminating rotational slip under high-torque cycling. The integrated clamp bolt arrangement adds a secondary mechanical retention force, meaning the assembly stays secure even when the drivetrain is subject to reversal loads, shock inputs, or vibration \u2014 conditions commonly encountered on UK farms, construction sites, and industrial processing plants.<\/p>\n

Manufactured from high-grade steel with controlled heat treatment, these yokes are designed to work within Ever-Power’s full range of PTO drive shafts \u2014 providing British engineers and procurement teams with a dependable, dimensionally accurate component that meets the demanding cycle requirements of European agricultural machinery standards.<\/p>\n

Request Pricing & Availability<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n

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Why UK Engineers Specify This Yoke<\/h2>\n
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\u2699<\/div>\n

Zero-Slip D-Keyway Drive<\/h3>\n

The flat on the D-bore mates directly with the shaft flat, delivering positive torque transmission without relying solely on friction. Combined with the clamp bolt, shaft pull-out under axial load is resisted far more effectively than plain round-bore designs.<\/p>\n<\/div>\n

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\ud83d\udd27<\/div>\n

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

Each yoke is forged or machined from alloy steel, then heat-treated to achieve the surface hardness and core toughness required for continuous PTO operation. The result is a part that resists both fatigue cracking and deformation across thousands of operating hours.<\/p>\n<\/div>\n

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\ud83d\udcc8<\/div>\n

Wide Series Range<\/h3>\n

Available across Series 1 through 8 with bore diameters from 20 mm to 50 mm, this yoke covers the majority of tractor and implement shaft sizes used on UK and European machinery \u2014 reducing the need to source multiple components from different suppliers.<\/p>\n<\/div>\n

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\ud83d\udce6<\/div>\n

Fast UK Dispatch<\/h3>\n

Stock items ship promptly from our UK-accessible logistics network, with consolidated pallet options for larger orders. Lead times for custom-specified bore sizes and surface treatments are quoted individually and kept as tight as our production schedule allows.<\/p>\n<\/div>\n

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\ud83d\udccb<\/div>\n

Dimensional Consistency<\/h3>\n

CNC machining to tight tolerances on the yoke bore, cross-hole, and clamp bolt thread ensures interchangeability across batch deliveries. UK maintenance teams can therefore replace worn yokes without re-alignment or re-drilling \u2014 saving valuable downtime during seasonal peaks.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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How the D-Keyway & Clamp Bolt System Works<\/h2>\n

\"PTOThe operating principle of this yoke design is elegantly straightforward, yet mechanically robust enough for continuous agricultural field use. When the yoke is slid onto a D-section shaft, the flat on the bore aligns with the flat on the shaft, providing an immediate anti-rotation keyed interface. The clamp bolt \u2014 positioned perpendicular to the bore axis \u2014 is then tightened to draw the yoke walls inward around the shaft, generating a clamping force that acts radially around the circumference. This dual-action retention (keyed engagement plus radial clamp) means the assembly handles both torque and axial withdrawal forces simultaneously.<\/p>\n

Under field conditions \u2014 such as when a tractor PTO engages rapidly, or when a combine’s feeder house reverses to clear a blockage \u2014 the yoke must absorb instantaneous torque spikes without micro-slipping. Micro-slip leads to fretting wear, elongated bores, and eventual catastrophic loosening. The D-keyway prevents this by distributing the tangential load over a much larger contact area than a round bore, while the clamp bolt prevents any linear movement along the shaft that could work the key loose over time. It is this combination that distinguishes the plain bore D-keyway clamp bolt yoke from simpler alternatives and justifies its use on higher-torque PTO drive shafts.<\/p>\n

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Materiaali<\/p>\n

Alloy steel with heat treatment (surface hardened, tough core)<\/p>\n<\/div>\n

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Surface Finish<\/p>\n

Electrophoretic coating or phosphate + oil (corrosion protection for UK climate)<\/p>\n<\/div>\n

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Drive Interface<\/p>\n

D-bore keyway profile + radial clamp bolt for dual retention<\/p>\n<\/div>\n

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Application Temp.<\/p>\n

-20 degrees C to +120 degrees C continuous operation<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Technical Specification & Dimensional Drawing<\/h2>\n

Dimensional reference drawing for the Plain Bore Yoke \u2014 D-Keyway & Clamp Bolt series:<\/p>\n

\"Plain<\/p>\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
Sarja<\/th>\nA (mm)<\/th>\nB (mm)<\/th>\nC (mm)<\/th>\nD (mm)<\/th>\nE (mm)<\/th>\nF (mm)<\/th>\nG (mm)<\/th>\n<\/tr>\n<\/thead>\n
1.05D20<\/td>\n22<\/td>\n54<\/td>\n93<\/td>\n21<\/td>\n6<\/td>\n12.8<\/td>\n20<\/td>\n<\/tr>\n
1.05D30<\/td>\n8<\/td>\n18.3<\/td>\n30<\/td>\n<\/tr>\n
1.05D32<\/td>\n10<\/td>\n19.3<\/td>\n32<\/td>\n<\/tr>\n
2.05D25<\/td>\n23.8<\/td>\n61.3<\/td>\n102<\/td>\n21<\/td>\n8<\/td>\n15.8<\/td>\n25<\/td>\n<\/tr>\n
2.05D30<\/td>\n18.3<\/td>\n30<\/td>\n<\/tr>\n
2.05D32<\/td>\n10<\/td>\n19.3<\/td>\n32<\/td>\n<\/tr>\n
3.05D25<\/td>\n27<\/td>\n70<\/td>\n108<\/td>\n21<\/td>\n8<\/td>\n15.8<\/td>\n25<\/td>\n<\/tr>\n
3.05D32<\/td>\n19.3<\/td>\n32<\/td>\n<\/tr>\n
3.05D35<\/td>\n12<\/td>\n20.8<\/td>\n35<\/td>\n<\/tr>\n
4.05D25<\/td>\n27<\/td>\n74.6<\/td>\n108<\/td>\n21<\/td>\n8<\/td>\n15.8<\/td>\n25<\/td>\n<\/tr>\n
4.05D32<\/td>\n19.3<\/td>\n32<\/td>\n<\/tr>\n
4.05D38<\/td>\n10<\/td>\n22.3<\/td>\n38<\/td>\n<\/tr>\n
5.05D32<\/td>\n30.2<\/td>\n80<\/td>\n108<\/td>\n21<\/td>\n10<\/td>\n19.3<\/td>\n32<\/td>\n<\/tr>\n
5.05D35<\/td>\n20.8<\/td>\n35<\/td>\n<\/tr>\n
6.05D30<\/td>\n30.2<\/td>\n92<\/td>\n118<\/td>\n21<\/td>\n8<\/td>\n18.3<\/td>\n30<\/td>\n<\/tr>\n
6.05D32<\/td>\n10<\/td>\n19.3<\/td>\n32<\/td>\n<\/tr>\n
6.05D38<\/td>\n12<\/td>\n22.3<\/td>\n38<\/td>\n<\/tr>\n
6.05D45<\/td>\n14<\/td>\n26.3<\/td>\n45<\/td>\n<\/tr>\n
6.05D50<\/td>\n28.8<\/td>\n50<\/td>\n<\/tr>\n
7.05D30<\/td>\n30.2<\/td>\n106.5<\/td>\n130<\/td>\n25<\/td>\n8<\/td>\n18.3<\/td>\n30<\/td>\n<\/tr>\n
7.05D35<\/td>\n10<\/td>\n20.8<\/td>\n35<\/td>\n<\/tr>\n
7.05D40<\/td>\n12<\/td>\n23.3<\/td>\n40<\/td>\n<\/tr>\n
8.05D30<\/td>\n35<\/td>\n106.5<\/td>\n130<\/td>\n25<\/td>\n8<\/td>\n18.3<\/td>\n30<\/td>\n<\/tr>\n
8.05D35<\/td>\n10<\/td>\n20.8<\/td>\n35<\/td>\n<\/tr>\n
8.05D40<\/td>\n12<\/td>\n23.3<\/td>\n40<\/td>\n<\/tr>\n
8.05D45<\/td>\n14<\/td>\n26.3<\/td>\n45<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Note: Dimensions are reference values. Custom bore sizes and special surface treatments available on request. Contact our engineering team for non-standard requirements.<\/p>\n<\/div>\n

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Where This Yoke Is Used \u2014 UK Application Scenarios<\/h2>\n

\"Ever-PowerAcross the United Kingdom, the Plain Bore Yoke with D-Keyway and Clamp Bolt turns up in a remarkably wide range of power transmission scenarios. In arable farming, it is the standard connection method on the input end of seed drill PTO drive shafts, where the seasonal start-up loads can be severe and any loosening during a planting run would be costly. On grassland farms in Scotland and the Welsh uplands, the same yoke connects mower-conditioner gearboxes to tractor PTOs \u2014 a demanding application given the continuous high-speed running and the risk of sudden impact from hidden stones. Livestock operations use it on feed mixer wagons, slurry pump shafts, and silage blowers throughout England’s dairy belt, from Somerset through to Shropshire and Cheshire.<\/p>\n

Beyond agriculture, the yoke appears in small-scale construction and civil engineering \u2014 powering compactor plate drives, cable reel drives, and portable generator PTOs on sites across the Midlands and the South East. Industrial applications in food processing \u2014 beet washing, potato handling, vegetable conveyors \u2014 also rely on this type of yoke where the bore must be kept clean and replacement must be quick. The availability of bore sizes from 20 mm to 50 mm means one product family handles the majority of shaft diameters a UK contractor is likely to encounter.<\/p>\n

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\ud83c\udf3f<\/div>\n

Arable & Grassland
\nFarming<\/p>\n<\/div>\n

\n
\ud83c\udfed<\/div>\n

Food Processing
\nPlants<\/p>\n<\/div>\n

\n
\ud83e\ude9f<\/div>\n

Construction &
\nSite Equipment<\/p>\n<\/div>\n

\n
\u26a1<\/div>\n

Portable Generator
\nPTO Drives<\/p>\n<\/div>\n

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\ud83d\udc10<\/div>\n

Livestock &
\nSlurry Equipment<\/p>\n<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

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

This yoke is compatible with all four series in the Ever-Power PTO drive shaft family. Select the series that matches your torque and operating environment:<\/p>\n

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Agricultural<\/p>\n

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

General-purpose agricultural PTO shaft covering standard tractor implement connections up to medium torque applications on UK farms.<\/p>\n<\/div>\n

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Standard Duty<\/p>\n

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

Versatile S Series shaft designed for a broad range of implement types, balancing weight, strength, and cost for everyday field and site operations.<\/p>\n<\/div>\n

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Light Duty<\/p>\n

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

Compact and lightweight design for smaller tractors and horticultural machinery \u2014 widely specified on market garden equipment and compact utility tractors across the UK.<\/p>\n<\/div>\n

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Heavy Duty<\/p>\n

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

Heavy-duty T Series shaft engineered for high-torque applications including large-scale balers, forage harvesters, and industrial PTO-driven machinery requiring maximum power transfer.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Manufacturing Capability & Custom Specification Service<\/h2>\n

Ever-Power operates a dedicated precision machining facility equipped with multi-axis CNC turning centres, coordinate measuring machines, and full in-process quality control. Every batch of Plain Bore Yokes with D-Keyway and Clamp Bolt goes through dimensional verification against the nominal drawing before dispatch, which is why our UK customers rarely see out-of-spec parts arriving on site. The workshop floor covers forging, rough machining, heat treatment, finish machining, and surface coating \u2014 all under one roof \u2014 so lead times are genuinely controlled rather than dependent on sub-supplier schedules.<\/p>\n

Our product customisation service is one of the strongest differentiators we offer to British distributors and OEM machinery builders. Non-standard bore diameters, alternative keyway profiles, modified clamp bolt positions, special coatings for high-moisture environments, and even bespoke yoke arm dimensions can all be quoted from technical drawings or dimensional specifications. We have produced custom PTO yoke components for UK manufacturers of specialist horticultural equipment, offshore energy maintenance platforms, and custom-build agricultural attachments. If your application falls outside the standard series range shown in the table above, send us a drawing or a sample \u2014 our engineering team will assess it within two working days and provide a price and lead time.<\/p>\n

\"Ever-Power<\/div>\n
Get a Quote \u2014 Custom & Standard Orders<\/a><\/div>\n<\/div>\n

<\/p>\n

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Customer Success: Real Results in the Field<\/h2>\n

Here is how buyers across the UK and Europe are putting these yokes to work in demanding real-world conditions.<\/p>\n

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\ud83c\uddec\ud83c\udde7 Case Study \u2014 East Anglian Arable Contractor, UK<\/p>\n

Eliminating Seasonal Yoke Failures on a 3,200-Acre Operation<\/h3>\n

A large arable contracting business operating across Norfolk and Suffolk was experiencing repeated PTO yoke slippage on their fleet of seed drills during the spring planting window. The bores were wearing oval within a single season, causing shaft run-out and ultimately damaging the drill gearboxes. After switching the entire drill fleet to the Ever-Power Series 5 and 6 Plain Bore Yokes with D-Keyway and Clamp Bolt, the contractor reported zero bore wear failures across the following two planting seasons \u2014 covering approximately 6,400 drill-acres. The dual retention system held firm even on the longer daily stints the team was running across the heavy Suffolk clay soils. The maintenance manager noted that the torque-check intervals on the clamp bolts could be extended from weekly to fortnightly without any measurable movement on the shaft flat \u2014 a direct result of the D-keyway taking the primary drive load.<\/p>\n<\/div>\n

<\/p>\n

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\u275d<\/p>\n

We have been sourcing PTO yokes and shafts from Ever-Power for three seasons. The dimensional accuracy is consistent batch to batch, which matters a great deal when you are replacing components mid-season and cannot afford any fitting issues on a field-side repair.<\/p>\n

James H. \u2014 Agricultural Machinery Distributor, Lincolnshire, UK<\/p>\n<\/div>\n

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\u275d<\/p>\n

We supply agricultural spare parts to dealers across Belgium and the Netherlands. The Ever-Power D-keyway clamp bolt yokes have become one of our most reliable product lines \u2014 returns are negligible and the range covers virtually every shaft size we encounter in the field.<\/p>\n

Marc D. \u2014 Agricultural Parts Wholesaler, Ghent, Belgium<\/p>\n<\/div>\n

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\u275d<\/p>\n

Our workshop handles PTO drivetrain repairs for a large client base in the Yorkshire Dales and North York Moors. We switched to Ever-Power yokes two years ago and the callouts for shaft-slippage faults have dropped significantly. The clamp bolt system is something our technicians trust.<\/p>\n

Tom R. \u2014 Agricultural Engineering Workshop, North Yorkshire, UK<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Usein kysytyt kysymykset<\/h2>\n
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\nWhat is the best plain bore yoke with D-keyway and clamp bolt supplier for UK agricultural machinery dealers? +<\/span><\/summary>\n

Ever-Power is a specialist PTO drive shaft component manufacturer supplying D-keyway plain bore yokes across Series 1 to 8 to agricultural machinery dealers throughout England, Scotland, and Wales. Our range covers bore diameters from 20 mm to 50 mm and we offer custom bore sizes on request. Email sales@pto-drive-shafts.com<\/a> for current pricing and stock availability.<\/p>\n<\/details>\n

\nHow does a D-keyway clamp bolt yoke prevent shaft slippage on high-torque UK tractor PTO drive shafts? +<\/span><\/summary>\n

The D-keyway creates a positive angular lock by mating the flat on the yoke bore with the flat on the shaft, eliminating rotational slip under torque. The clamp bolt adds radial clamping force around the shaft, resisting axial pull-out during reversal loads and shock inputs \u2014 a combination that outperforms plain round-bore designs under continuous agricultural duty cycles common on UK farms.<\/p>\n<\/details>\n

\nWhat bore sizes and series are available, and how do I choose the right one for my implement? +<\/span><\/summary>\n

The plain bore D-keyway clamp bolt yoke is available from Series 1 through Series 8, with G bore diameters from 20 mm to 50 mm. Series selection is based on PTO shaft torque rating and implement shaft diameter: lighter tractors and horticultural equipment typically use Series 1 to 3, mid-range agricultural machinery Series 4 to 6, and heavy-duty implements Series 7 to 8. If in doubt, send your shaft specifications to our team for a recommendation.<\/p>\n<\/details>\n

\nWhere can I get a competitive price or bulk quote for plain bore PTO yokes as a UK wholesale distributor? +<\/span><\/summary>\n

UK parts wholesalers can request bulk pricing and lead time quotes by emailing sales@pto-drive-shafts.com<\/a> directly. We supply palletised mixed-series orders to distributors serving England, Scotland, and Wales, and can accommodate scheduled blanket orders for high-volume accounts. Volume discount tiers apply from 50 units per model upwards.<\/p>\n<\/details>\n

\nHow long does it take to receive a custom D-keyway clamp bolt yoke with a non-standard bore for a UK OEM project? +<\/span><\/summary>\n

Custom bore yokes typically require 15 to 25 working days from order confirmation depending on production schedule and specification complexity. For urgent OEM prototype quantities, express tooling lead times may be possible \u2014 contact our engineering team with your drawing for a confirmed timeline and cost estimate.<\/p>\n<\/details>\n

\nWhich surface finish should I specify for PTO yokes used on farm equipment in Scotland and northern England’s wet climate? +<\/span><\/summary>\n

For equipment operating in the wet conditions common across Scotland and northern England, we recommend electrophoretic (e-coat) or phosphate plus oil finish options. Both significantly outperform bare steel or standard paint in corrosion resistance, making them well suited to equipment exposed to frequent rain, mud, and pressure washing between field operations.<\/p>\n<\/details>\n

\nWhen should I replace a worn plain bore PTO yoke, and what are the visible warning signs to look for on farm machinery? +<\/span><\/summary>\n

Replace a plain bore yoke if you observe ovality of the bore when measured with a calliper, play between the yoke and shaft flat when the clamp bolt is correctly torqued, vibration or knocking noise during PTO engagement, or fretting corrosion and heat marks around the bore mouth. Any of these signs indicate the yoke should be replaced before the next season to prevent downstream drivetrain damage.<\/p>\n<\/details>\n<\/div>\n<\/div>\n

<\/p>\n

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

Whether you need a standard catalogue item or a custom specification, our team can provide a detailed quote and technical support within one business day.<\/p>\n

\u2709\u00a0 Email Us: sales@pto-drive-shafts.com<\/a><\/p>\n

gzl:n muokkaama<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

Plain Bore Yoke with D-Keyway & Clamp Bolt \u2014 alloy steel, heat-treated, Series 1\u20138, 20\u201350 mm bore. Zero-slip PTO shaft connection for UK agricultural & industrial use.<\/p>","protected":false},"featured_media":3360,"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-3354","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\/fi\/wp-json\/wp\/v2\/product\/3354","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.pto-drive-shafts.com\/fi\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.pto-drive-shafts.com\/fi\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pto-drive-shafts.com\/fi\/wp-json\/wp\/v2\/comments?post=3354"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.pto-drive-shafts.com\/fi\/wp-json\/wp\/v2\/media\/3360"}],"wp:attachment":[{"href":"https:\/\/www.pto-drive-shafts.com\/fi\/wp-json\/wp\/v2\/media?parent=3354"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.pto-drive-shafts.com\/fi\/wp-json\/wp\/v2\/product_brand?post=3354"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.pto-drive-shafts.com\/fi\/wp-json\/wp\/v2\/product_cat?post=3354"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.pto-drive-shafts.com\/fi\/wp-json\/wp\/v2\/product_tag?post=3354"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}