Denso PK20TT Platinum TT Spark Plug

The PK20TT uses a 1.1mm platinum alloy center electrode with a titanium-enhanced alloy ground, thread size 14mm × 1.25, heat range Denso 20 (inferred from the part number, not confirmed on the product page). Denso is an OE ignition supplier for Honda, Toyota, Mazda, and Subaru; OEM cross-references extend to BMW, VW, and Mitsubishi. Community confirms correct fitment on Honda Accord applications; no heat-range mismatch or construction failure reports appear in the review sample. Community reports two of six plugs needed gap adjustment out-of-box.

Right pick for Honda, Toyota, or Mazda owners whose engine calls for a platinum plug at the Denso 20 heat range (verify via the OEM service manual). Skip if your engine requires double-platinum or iridium, or if a stated mileage rating matters to you.

No chemical exposure pathway; this is a passive ignition-system part with no SDS. The platinum alloy tip carries a small precious-metal mass; the steel shell is recyclable as ferrous scrap, and the alumina-ceramic insulator goes to landfill via standard disposal.