DENSO 4709 IW20TT Iridium TT Spark Plug

The DENSO 4709 IW20TT Iridium TT spark plug combines advanced iridium and platinum technologies with DENSO's patented 360-degree laser welding process to deliver a lifetime exceeding 100,000 miles. This premium spark plug features the world's smallest 0.4mm iridium center electrode and a 0.7mm platinum needle tip ground electrode, maximizing ignitability while minimizing spark interference for superior power, torque, and fuel economy.

Key Features:

• Twin-Tip (TT) technology with 0.4mm iridium center electrode and 0.7mm platinum ground electrode
• Promotes spark energy concentration and explosion for improved acceleration and economy
• DENSO's patented iridium alloy with highest iridium concentration for maximum durability
• Machine rolled threads prevent seizing or cross-threading during installation and removal
• 100% pre-fired to assure highest quality possible
• Purified alumina powder insulator provides exceptional strength and thermal conductivity

Specifications:

• Thread Size: 14mm (M14)
• Hex Size: 13/16" (20.6mm)
• Reach: 19mm (3/4")
• Seat Type: Gasket
• Gap: 0.040" (1.0mm)
• Heat Range: 20

The twin tips deliver omnidirectional ignition with less interference and spark growth quenching, resulting in improved combustion efficiency compared to conventional flat "sandwich" ignition spark plugs. Tested to last well beyond 100,000 miles with minimal loss of performance, delivering greater lifetime savings than standard spark plugs.

OEM Cross-References: Replaces Chrysler MS851555, GM 19310643, Honda 98079-561-46, Subaru 22401AA120, Suzuki 09482-00285, and many other OEM part numbers.