Kubota Cylinder Head Bolt Set for D662–DG972 Engines – 14-Piece OEM Replacement

Product Specifications

Compatible Models

Tired of Cylinder Head Bolts Snapping Under Torque? Get the Right Kubota Cylinder Head Bolt Set for D662–DG972 Engines

Every unscheduled engine shutdown costs operators $1,200–$3,500 per day in idle labor, rental penalties, and missed deadlines. Counterfeit or low-grade head bolts fail during final torque — causing cylinder head warping, coolant leaks, and catastrophic engine failure. OEM replacements take 18–25 days to arrive from Japan, halting critical maintenance cycles across construction, agriculture, and municipal fleets.

OEM-Equivalent Quality, Ready to Ship from Guangzhou Warehouse

This 14pcs Kubota cylinder head bolt set is manufactured in ISO 9001-certified factories and tested to match original torque retention, tensile strength, and thermal expansion behavior. Designed for full compatibility with D662–DG972 engines used in Kubota tractors, excavators, and generators, it supports high-load operations including earthmoving, trenching, and continuous-duty genset applications. With 10 years’ experience supplying Kubota aftermarket parts to 120+ countries, XUNPO ensures every batch meets OEM-equivalent performance standards before shipment.

Where This Part Works

These bolts secure the cylinder head under extreme cyclic loading — from 300°C combustion temperatures to repeated thermal shock during cold starts and heavy load transitions. They’re routinely installed on job sites in Southeast Asia’s humid rice fields, Middle East’s high-heat quarries, North America’s freeze-thaw municipal infrastructure projects, and Africa’s remote mining support fleets. Correct clamping force is non-negotiable: a single underspec bolt risks head gasket blowout, leading to oil-coolant mixing and irreversible liner scoring.

Engineering Details That Matter

Each bolt is forged from SCM435 alloy steel and quenched & tempered to 10.9 grade per ISO 898-1 — delivering minimum tensile strength of 1000 MPa and yield strength of 900 MPa. Surface hardness is precisely controlled between 32–39 HRC to prevent thread galling during installation. Thread pitch and root radius conform to JIS B1051 specifications for exact fit with factory head threads. All bolts undergo magnetic particle inspection to eliminate subsurface flaws. Zinc flake coating (DIN EN 13858) provides 720-hour salt-spray corrosion resistance — critical for coastal ports and irrigation-dependent farms.

The Real Cost of Wrong Parts

A $4.20 counterfeit bolt may save $1.80 upfront but increases total cost of ownership by 370%: rework labor ($220), new head gasket ($145), coolant flush ($65), and 14.5 hours of downtime ($2,100). Industry data shows non-OEM head bolts fail 2.3× faster under cyclic load testing — verified by independent lab reports per ASTM F606. Using this Kubota D662–DG972 cylinder head bolt replacement avoids hidden costs tied to warranty voids, secondary damage, and failed emissions compliance during annual inspections. Total lifecycle value exceeds OEM pricing by 22% when factoring lead time and reliability.

Why Customers Trust XUNPO

Packaging & Shipping

• Individually sorted and labeled in rigid cardboard tray with anti-rust VCI paper and molded EPE foam
• In-stock items ship within 2–5 working days after payment confirmation
• Flexible logistics: DHL/FedEx/UPS express (3–7 days), air freight (7–12 days), or sea freight (25–40 days)
• Real-time tracking provided from Guangzhou warehouse to destination port or door
• MOQ is 1 piece — supporting urgent field repairs and small workshop inventories

Get Your Kubota Cylinder Head Bolt Set Now

Your excavator or tractor isn’t generating revenue while waiting for parts. Send us your machine model (e.g., BX2380 or KX018-4), quantity needed, and destination country — we’ll email a competitive quote within 24 hours. First-time buyers can request a sample set for physical verification before bulk order. With Guangzhou warehouse stock and strict quality control, you get reliable delivery without OEM delays.

Frequently Asked Questions