Beschrijving
What Is a Plain Bore Yoke A‑Pin Hole?
The Plain Bore Yoke A-Pin Hole is a core coupling component used at the input or output end of a PTO drive shaft assembly. Unlike splined yokes, the plain bore design relies on a cross-pin (A-pin) for secure shaft engagement, making it particularly suited to applications where shaft diameters require field-adjustable fixing or where installation access is restricted. The yoke body is forged from medium-carbon steel and heat-treated to deliver high torsional rigidity without excess weight. Across UK agriculture — from Yorkshire arable farms running disc mowers to Scottish estate groundskeeping machinery — this component plays a critical role in transmitting power cleanly and reliably from a tractor’s power take-off to a wide range of implements.
Each EP series yoke is produced with tight bore tolerances and a standardised pin-hole geometry that aligns directly with our universal cross-kits, eliminating the guesswork that comes with sourcing components from multiple suppliers. Our UK B2B customers — including agricultural machinery dealers in the Midlands, hydraulic system integrators in Birmingham, and export distributors supplying the wider European market — consistently report longer service intervals and fewer unexpected downtime events when switching to EP-specification yokes.
Why UK Engineers Choose This Yoke
Precision Bore Tolerances
Each yoke is machined to H7 bore tolerance standards, ensuring a predictable, repeatable shaft fit across every series from 1.05 to 8.05.
A-Pin Locking Security
The transverse pin hole provides a positive mechanical lock that handles torque shock loading — critical in agricultural applications where sudden engage-disengage cycles are routine.
Forged Steel Construction
Medium-carbon steel forgings followed by induction heat treatment deliver a tensile strength that outlasts cast alternatives in both static and dynamic loading environments.
Wide Series Range
Series 1.05 through 8.05 cover bore diameters from 20 mm up to 45 mm, giving UK equipment builders a single-supplier solution across compact and heavy-duty drive applications.
DIN-Compatible Design
Geometry aligns with DIN EN 15173 universal joint standards, making cross-kit interchangeability straightforward for UK dealers and OEM assembly lines alike.
Fast UK Despatch
Stock held for popular bore sizes across Series 1 to 6 enables rapid despatch to mainland UK addresses, supporting urgent replacement requirements during peak harvesting seasons.
Material, Principle & Application Scenarios
🔍 Working Principle
The plain bore yoke receives the shaft end of a PTO tube or implement input shaft directly through its circular bore. Once positioned to the correct engagement depth, a hardened pin is pressed transversely through the pin hole and shaft groove, creating a positive rotary lock. Torque is transmitted through this pin into the yoke body and then outward through the universal joint spider, allowing the drive line to operate through angular misalignment without slip or backlash under normal working loads.
⚙ Material Specification
Yoke bodies are forged from 40Cr or equivalent medium-carbon alloy steel. Post-forging normalising removes residual stress, followed by surface hardening to 52–58 HRC on the bore and pin-hole regions. The outer yoke ears are shot-peened to introduce compressive surface stress, resisting fatigue crack initiation under cyclical bending loads. A phosphate conversion coating provides corrosion resistance during storage and transit, while remaining compatible with common greases used during field assembly.
🌿 Application Scenarios
The Plain Bore Yoke A-Pin Hole finds its primary home in UK farm machinery: balers, disc mowers, tedders, rotary tillers, and fertiliser spreaders operating on tractors from 40 hp up to 180 hp. Beyond agriculture, the same yoke is used by grounds maintenance contractors in Scotland and Wales operating mulchers and large-area mowers, as well as by industrial OEMs building test-bench drive systems, pump drives, and compactor equipment where a reliable, re-assemblable shaft connection is needed without committing to a spline profile.
CNC machining centre — EP Driveline Manufacturing
Technical Specifications
Dimensional data for all Plain Bore Yoke A-Pin Hole series. All measurements in millimetres (mm).
EP Plain Bore Yoke A-Pin Hole — Engineering Drawing | Dimensions: A, B, C, D, E, F
* A = Yoke width across ears | B = Bore-to-ear face length | C = Total yoke length | D = Pin hole diameter | E = Bore diameter | F = Pin diameter
Complete PTO Drive Shaft Series
This yoke is compatible with the following EP PTO drive shaft series. Browse the full range to find the right driveline solution for your UK agricultural or industrial application:
PTO Drive Shaft G Series
General-purpose series for light to medium agricultural implements. Compact profile, broad spline compatibility, widely used on UK market tractor-mounted equipment.
PTO Drive Shaft S Series
Standard heavy-duty series designed for high-torque PTO applications. Reinforced cross-journal and larger tube diameter suit demanding cultivating and baling operations.
PTO Drive Shaft L Series
Long-length series for extended reach between tractor and trailed implement. Popular with contractors running large-acreage combinable crop machinery across England’s Eastern counties.
PTO Drive Shaft T Series
Telescopic high-performance series with overrunning clutch options. Ideal for PTO-driven pumps, generators, and professional vegetation-management equipment operated by UK grounds-care contractors.
Customer Success: UK & European Case Study
Real-world results from B2B customers integrating Plain Bore Yoke A-Pin Hole components into working machinery.
Replacing Multi-Supplier Yoke Procurement — Lincolnshire, England
Hargreaves Agricultural Supplies, a farm machinery parts distributor serving the Lincolnshire and South Yorkshire regions, had been sourcing plain bore yokes from three separate suppliers — creating inconsistencies in bore tolerances that were leading to pin hole misalignment complaints from end customers. After a trial order of 200 units across Series 2.05 and 3.05, their workshop manager reported that zero bore-to-shaft interference issues occurred during bench fitting, compared to a previous failure rate of approximately 8%. The consistent H7 tolerance across every EP batch eliminated the need for their fitters to hand-ream bores on arrival, saving an estimated 1.5 hours of labour per pallet received. Hargreaves now hold EP Series 1 through 6 on consignment stock and report that the plain bore yoke A-pin hole range accounts for 34% of their driveline parts revenue.
“We fitted the 4.05A30 yokes to our round baler fleet before harvest and ran all 14 machines through a full season without a single drive shaft issue. The pin engagement was solid and the dimensional consistency across the batch was noticeably better than what we had before.”
“As a pump drive integrator supplying the water treatment sector across the North West, tolerances matter enormously to us. The EP 7.05A42 units handle continuous 1,000 rpm operation without measurable wear at the pin hole after 18 months in service. Reordering is straightforward — lead times are quoted clearly and deliveries arrive correctly.”
“We export EP plain bore yokes into France and the Netherlands and have zero complaints on dimensional conformance from our European customers. The packaging is also well-protected, which matters when pallets are transiting through multiple hubs. Overall a very reliable supplier for this product category.”
Manufacturing & Custom Engineering Capability
Our production facility operates CNC turning centres, four-axis machining cells, and dedicated forging press lines committed exclusively to PTO driveline components. Every Plain Bore Yoke A-Pin Hole passes through inline bore gauging and pin-hole positional checks before progressing to heat treatment — a process step that many commodity yoke manufacturers skip to reduce cycle time but which we regard as non-negotiable for our quality assurance commitment. UK B2B buyers can inspect our quality control documentation, including hardness test records and batch measurement reports, on request.
Beyond catalogue sizes, our engineering team handles non-standard requests regularly — extended bore depths for thicker tube walls, alternative pin hole diameters, special surface coatings including zinc plating or black oxide for corrosion-sensitive environments, and matched yoke pairs calibrated to custom shaft assemblies. Minimum order quantities for custom variants are discussed case by case, with many UK OEM customers running bespoke series from 50 units. If your application falls outside the standard specification table above, contact us with your drawing or describe your shaft diameter, pin size, and operating torque and we will respond with a feasibility assessment within one working day.
Veelgestelde vragen
What is the difference between a plain bore yoke with an A-pin hole and a splined bore yoke for UK farm machinery?
A plain bore yoke uses a smooth circular bore and a cross-pin (the A-pin) to lock onto the shaft, whereas a splined yoke engages via matching spline profiles cut into both shaft and bore. Plain bore designs are preferred when shaft diameters need to be matched after installation — common in UK agricultural repair situations — and when the connecting shaft does not carry a pre-cut spline. They are also easier to disassemble in the field using basic tools, which matters during harvest when downtime cannot be tolerated.
How much does a Plain Bore Yoke A-Pin Hole cost and what is the price for bulk orders from a UK supplier?
Unit pricing varies by series and bore size, with smaller Series 1 and 2 yokes carrying lower per-unit costs than the larger Series 7 and 8 variants. Volume pricing tiers are available from 10 units upward, with further reductions at 50 and 200+ unit quantities. For an accurate quote tailored to your specific series, bore diameter, and required quantity, please contact our UK sales team at [email protected] — we typically respond with a formal quotation within one business day.
Which series of plain bore yoke should I choose for a 100 hp tractor PTO shaft running a disc mower in the UK?
For a 100 hp tractor application powering a disc mower, the Series 4 or Series 5 plain bore yoke (bore sizes 25–35 mm) is typically the correct selection, depending on the implement’s input shaft diameter. Disc mowers experience significant shock load during stone strikes, so ensuring you select a yoke with a D-dimension (pin hole diameter) of 20 or 25 mm, matched to the cross-kit being used, is critical. Our technical team can assist with selection if you provide the shaft diameter, operating speed in rpm, and the make and model of your mower.
Where can I find a reliable supplier of plain bore PTO yokes for agricultural equipment dealers in England and Scotland?
pto-drive-shafts.com supplies Plain Bore Yoke A-Pin Hole components to agricultural machinery dealers, farm co-operatives, and OEM manufacturers across England, Scotland, and Wales. We hold stock of the most popular bore sizes in Series 1 through 6, with despatch to mainland UK addresses available on a next-day basis for confirmed orders placed before 2 pm. Scottish and Northern Irish customers can confirm lead times during the quotation process. Contact us at [email protected] for stock availability and dealer pricing structures.
Can you supply custom bore sizes or non-standard pin hole diameters for OEM agricultural equipment manufacturing in the UK?
Yes. Our factory operates CNC machining centres capable of producing plain bore yokes to custom bore diameters, pin hole sizes, and overall length specifications beyond the standard catalogue. UK OEM customers typically provide a 2D drawing or describe their shaft and pin requirements, and we confirm feasibility within one working day. Minimum quantities for custom variants start from 50 pieces for most configurations, with tooling amortised across the order. Surface treatments including zinc plating and black oxide can also be applied to custom batches on request.
How do I check if the EP plain bore yoke A-pin hole is compatible with my existing PTO drive shaft cross-kit and tube assembly?
Compatibility depends on three measurements: the yoke ear-to-ear width (dimension A in the table), the cross-kit trunnion diameter, and the bore diameter (E) relative to your shaft OD. If your existing cross-kit matches the A-dimension of the EP yoke series, the yoke ears will accept the spider bearing cups. The bore (E) should match your shaft OD to an H7 sliding fit, and the pin hole diameter (F) must match the pin you intend to use. If you send us your cross-kit part number or the A-dimension of your current yoke, we can confirm the compatible EP series within the same business day.
Ready to Order or Request a Custom Quote?
Our UK B2B sales team is available Monday–Friday, 8 am–6 pm. Quotations for standard series are typically returned within two hours.
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