Plain Bore Yoke Type A-Pin Hole for PTO Shaft

The Plain Bore Yoke Type A-Pin Hole is the most fundamental implement-end PTO yoke design: a precision-bored cylindrical hole with a cross-drilled pin hole for securing the yoke to round shafts using a roll pin or clevis pin. This time-proven retention method has been the industry standard for decades, prized for its simplicity, low cost, and universal applicability across gearbox inputs, pump shafts, and general implement connections.

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Description

Plain Bore Yoke Type A (Pin Hole) — Simple, Proven Round-Bore PTO Yoke for Implement Connections

Plain Bore Yoke Type A-Pin Hole for PTO Shaft

The Plain Bore Yoke Type A-Pin Hole represents the original and most widely recognized implement-end PTO yoke connection. A cylindrical bore accepts standard round shafts, and a cross-drilled hole allows a roll pin or spring pin to pass through both the yoke bore and shaft for rotational and axial retention. This design has remained virtually unchanged for half a century because it works — reliably, predictably, and at the lowest cost of any yoke retention method. Type A is the default choice for gearbox input shafts, centrifugal pumps, and standard agricultural implement PTO connections.

🔧 Technical Specifications

Series A(mm) B(mm) C(mm) D(mm) E(mm) F(mm)
1.05A20 22 54 77 20 20 6
1.05A25 22 54 77 20 25 8
1.05A30 22 54 77 20 30 10
2.05A20 23.8 61.3 82 20 20 6
2.05A25 23.8 61.3 82 20 25 8
2.05A30 23.8 61.3 82 20 30 10
3.05A22 27 70 90 20 22 8
3.05A25 27 70 90 20 25 10
3.05A30 27 70 90 20 30 10
3.05A35 27 70 90 20 35 13
4.05A25 27 74.6 90 20 25 8
4.05A30 27 74.6 90 20 30 10
4.05A35 27 74.6 90 25 35 13
5.05A30 30.2 80 98 20 30 10
5.05A35 30.2 80 98 20 35 13
5.05A40 30.2 80 98 20 40 13
6.05A30 30.2 92 104 20 30 10
6.05A35 30.2 92 104 20 35 13
6.05A40 30.2 92 104 20 40 13
7.05A35 30.2 106.5 117 25 35 13
7.05A40 30.2 106.5 117 25 40 13
7.05A42 30.2 106.5 117 25 42 13
7.05A45 30.2 106.5 117 25 45 13
8.05A35 35 106.5 121 25 35 13
8.05A40 35 106.5 121 25 40 13
8.05A42 35 106.5 121 25 42 13
8.05A45 35 106.5 121 25 45 13

specifications

⭐ Key Features & Benefits

📌 Cross-Drilled Pin Hole

Precision-drilled through-hole aligned for standard roll pins — the simplest, most foolproof shaft retention.

💰 Lowest Cost Retention

Pin-hole yokes are the most economical option, keeping replacement parts costs minimal.

🔧 Universal Shaft Compatibility

Cylindrical bore accepts any round shaft with a matching pin hole — no keyway, spline, or special feature required.

📐 20-45mm Bore Range

Covers shaft diameters from 20 mm to 45 mm across Series 1-8, matching nearly all standard implement inputs.

⚙ CNC-Bored to H7 Tolerance

Precision cylindrical bore provides a controlled slip fit on standard h6/js6 shafts.

💪 Forged Alloy Steel

Same premium 40Cr forging and heat treatment as all our yoke types — pin-hole simplicity does not mean lower quality.

🔄 Compatibility Information

Fits any cylindrical implement shaft with a cross-drilled pin hole in the matching diameter range (20-45 mm). Works with gearbox inputs from Comer, Bondioli & Pavesi, Brevini, OMSI, Reggiana Riduttori, and all standard agricultural implement manufacturers. Compatible with all cross kit series.

📚 Selection Guide

Step 1 — Measure Shaft Diameter: Use a caliper to measure the implement shaft OD precisely. Select the matching E (bore) dimension.

Step 2 — Check Pin Hole Position: Verify the shaft pin hole location aligns with the yoke pin hole when the yoke is fully seated.

Step 3 — Select Pin Size: F dimension indicates the pin hole diameter. Use a matching roll pin (slightly oversized for interference fit).

selection guide

🌾 Typical Application Scenarios

⚙ Gearbox Input Shafts
Standard connection for agricultural gearbox and angle drive input shafts
💧 Pump Drives
Centrifugal, submersible, and transfer pumps with round input shafts
🌾 Standard Implements
Mower deck spindles, rotary tiller inputs, spreader mechanisms
🔧 General Engineering
Industrial equipment, conveyor drives, fan shafts with pin-hole provision

🛠 Installation & Usage Guide

  1. Slide yoke onto shaft: The bore should slide on smoothly with a slight slip fit. If it is too tight, check shaft for burrs.
  2. Align pin holes: Rotate the yoke until the yoke pin hole aligns perfectly with the shaft pin hole.
  3. Insert roll pin: Tap a standard roll pin through both yoke and shaft holes using a pin punch and hammer.
  4. Verify pin is flush: Pin should be seated flush with the yoke surface to avoid interference with adjacent components.
  5. Install cross kit: Mount universal joint and PTO shaft components.
  6. Grease and inspect: Lubricate bearings and verify the pin shows no signs of bending or looseness.

❓ Frequently Asked Questions

What type of pin should I use?
Standard spring (roll) pins in the matching F dimension. Use a pin slightly longer than the yoke bore diameter for full engagement.
Can I use a bolt instead of a roll pin?
A shouldered bolt with locknut can work but adds cost. Roll pins provide adequate shear strength for rated loads.
How do I remove a stuck roll pin?
Use a pin punch and hammer from the opposite side. If corroded, apply penetrating oil first.
Is pin-hole retention as strong as keyway?
For pure rotational retention, keyways are stronger. Pin holes provide both rotational and axial retention in one simple feature.
What bore tolerance can I expect?
H7 standard (e.g., 30 mm bore = 30.000 to 30.021 mm).
Are custom bore sizes available?
Yes. We can bore to any diameter within the yoke body capacity. Minimum order applies.


application

🌟 Customer Reviews

★★★★★

Ken D. — 🇦🇺 Australia

“Simple, effective, and affordable. These pin-hole yokes fit our Comer gearbox inputs perfectly. We keep a stock of all common bore sizes.”

★★★★★

Wolfgang E. — 🇩🇪 Germany

“H7 bore tolerance is consistently achieved. Pin holes are clean and well-positioned. Basic design, premium execution.”

★★★★☆

Luciano B. — 🇧🇷 Brazil

“Good value for the quality. The forging and heat treatment are identical to more complex yoke types. Pin retention works reliably.”

★★★★★

Carl H. — 🇺🇸 United States

“We use these on pump drive shafts. The pin hole retention is perfectly adequate for our application. Cannot beat the price.”

★★★★★

Sylvie P. — 🇫🇷 France

“Exactly what you need for standard implement connections. No unnecessary complexity. Quality forging and precise boring.”

⚖ Our Product vs. Inferior Alternatives

Feature Ever-power Low-Cost Alternatives
Cost Most economical yoke type Often similar price despite lower quality
Installation Simplicity Pin and hammer — done in 60 seconds May require special tools
Bore Accuracy CNC H7 tolerance Rough-drilled, no standard
Material Forged alloy steel, heat treated Cast or mild steel
Pin Hole Quality Precision drilled, deburred Rough-drilled, off-center
Quality System ISO 9001:2015 No certification

🔗 Related Products & Accessories

Roll Pin Assortments

Standard spring pin kits in common sizes

Gearbox Input Shafts

Matching round shafts for gearbox connections

Cross Kits

Universal joint kits for all series

PTO Safety Shields

Drive shaft guard assemblies

Explore our full PTO shaft components catalog for matching parts.

Ever-power factory

✅ Certifications & Quality Standards

  • ISO 9001:2015 Certified
  • H7 Bore Tolerance Verification

Related products

As one of the PTO Shaft manufacturers, suppliers, and exporters, we supply agricultural PTO shaft solutions. Find the PTO shaft products here. Choose high-quality PTO shafts and parts on ptoparts.top.
If there is any copyright infringement or find objectionable information, please contact us, and we will delete it immediately. Address:27B Harley Crescent, Condell Park NSW 2200, Sydney, Australia. The use of original equipment manufacturer (OEM) part numbers or trademarks is for informational purposes only, describing product use and compatibility and replacing damaged original equipment parts. Our company and the replacement parts listed here are not sponsored, approved, or manufactured by the OEM. Edited by Zqq.