About Double HH Manufacturing
Double HH Manufacturing Agricultural Hardware
Double HH Manufacturing has over 50 years of experience innovating and manufacturing high-quality precision-machined agricultural equipment components. The company pioneered the hitchpin with a heavy-duty, red plastisol-coated head and wide grip handle—a design now industry-standard—and continues to deliver dependable custom-machined and stocked hardware across diverse agricultural and industrial sectors.
Double HH's product line includes durable hitch pins with secure head designs preventing accidental ejection during transport, precision-machined linkage parts (pins, bushings, clevis attachments) for Category 0, 1, 2, and 3 three-point hitches, safety clips, cotterpins, and O-rings. All products are manufactured to exacting tolerances and finished for corrosion resistance.
The company specializes in three-point hitch system components for secure attachment of plows, harrows, mowers, and implements to modern and vintage tractors. Their precision-cast and machined components enable safe, repeatable implement positioning and load transfer during demanding field operations.
Double HH Manufacturing holds ISO 9001 certification, demonstrating commitment to quality management systems and consistent, defect-free production. The company serves OEMs, agricultural equipment distributors, rental fleets, and individual farmers requiring reliable hitch hardware and replacement parts.
ChatMRO users can search Double HH components by three-point hitch category, pin size and type (standard, linch-pin, clevis), or hardware function, and instantly retrieve exact agricultural components with material specs and availability from farm equipment supply distributors.
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Frequently asked questions
What's the difference between a standard hitch pin and a linch-pin for three-point hitches?
Standard hitch pins (Double HH's classic design) require manual removal and insertion for each implement attachment; linch-pins self-retain with a coiled wire loop that prevents accidental loss during operation. Linch-pins suit high-frequency attachment/detachment workflows; standard pins cost less for permanent or seasonal implement mounting.
How do I select the correct three-point hitch category (0, 1, 2, 3) for my tractor and implement?
Hitch categories correspond to tractor PTO horsepower and implement weight capacity: Category 0 suits small utility tractors; Category 1 handles mid-size tractors (25-45 HP); Category 2 supports larger tractors (45-100+ HP); Category 3 is for heavy-duty implements on large row-crop tractors. Always match your implement's hitching category to your tractor's certification to ensure safe load transfer.
Are Double HH hitch pins available in stainless steel for corrosive environments?
Double HH offers stainless steel options for coastal, salt-spray, or chemically-exposed applications; stainless pins cost more than zinc-plated carbon steel. The company's standard red plastisol-coated design provides excellent corrosion resistance for typical farm environments and is cost-effective for most applications.
Can I use aftermarket hitch pins as replacements for OEM parts?
Yes, Double HH pins meet agricultural industry standards (SAE 2000) and are drop-in replacements for most OEM hitch systems. Verify pin length, diameter, and head design against your tractor's manual or OEM parts diagram to ensure proper fit and safe load transmission.
How often should three-point hitch pins and bushings be inspected for wear?
Inspect hitch components before each planting/harvest season and after heavy usage (rocky terrain, transport over poor roads). Look for bent pins, cracked bushings, or excessive slack in joints. Replace worn components immediately—failed hitch connections can cause implement loss or safety hazards during high-speed transport.