XR5IX NGK Iridium Spark Plug | Genuine NGK Spark Plug

🔧 Product Description

NGK Iridium Spark Plug – Part Number: XR5IX

Iridium NGK spark plugs offer a longer service life than a standard nickel-tipped spark plug: while nickel-alloy plugs offer a service life of roughly 20,000-40,000km, NGK Iridium IX spark plugs offer a service life of up to 60,000km, so fewer replacements are needed over time despite the higher initial cost.

Precious-metal spark plugs like the NGK Iridium IX also offer higher ignitability, achieved with an exposed fine-tip centre electrode that promotes superior flame growth compared with a standard spark plug. Iridium has a much higher melting point (2410°C) than nickel (1453°C), allowing the centre electrode diameter to be reduced from 2.5mm to 0.6mm – a smaller electrode mass that reduces the impedance to flame progress, helping acceleration, fuel consumption and idle quality.

⚙️ Key Features

• Fine iridium-tipped centre electrode for a slow wear rate and stable idle
• Longer service life than standard nickel plugs
• Trivalent metal plating provides superior anti-corrosion and anti-seizing properties
• Corrugated ribs reduce the risk of flashover
• Pure alumina silicate ceramic insulator, providing superior strength and better heat transfer
• Copper core aids in heat removal
• Triple seals prevent leakage

📏 Specifications

• NGK stock number: 7355
• Thread: 14 mm
• Reach: 9.5 mm (3/8 in)
• Hex: 20.8 mm (13/16 in)
• Seat: Gasket
• Terminal: Solid
• Type: Projected

🚘 Application

Listed in NGK's application charts for marine, motorcycle, ATV and snowmobile equipment and automotive vehicles. The gap is not the same on all of them – the chart lists between 0.5 mm and 1.0 mm depending on the engine, so check the line for yours.

• Chrysler M80 (8 CYL) – Inboard Engine
• Chrysler M318A (8 CYL) – Inboard Engine
• Chrysler M318B (8 CYL) – Inboard Engine
• Chrysler M318C (8 CYL) – Inboard Engine
• Chrysler M318GD (8 CYL) – Inboard Engine
• Chrysler M383B (8 CYL) – Inboard Engine
• Chrysler M383BV (8 CYL) – Inboard Engine
• Chrysler M400B (8 CYL) – Inboard Engine
• Chrysler M400BV (8 CYL) – Inboard Engine
• Chrysler M400S (8 CYL) – Inboard Engine
• Chrysler M413B (8 CYL) – Inboard Engine
• Chrysler M413D (8 CYL) – Inboard Engine
• Chrysler M426B (8 CYL) – Inboard Engine
• Chrysler M426D (8 CYL) – Inboard Engine
• Chrysler M426-SKI (8 CYL) – Inboard Engine
• Chrysler M440B (8 CYL) – Inboard Engine
• Chrysler M440BJ (8 CYL) – Inboard Engine
• Chrysler M440BV (8 CYL) – Inboard Engine
• Chrysler M440D (8 CYL) – Inboard Engine
• Chrysler M440S (8 CYL) – Inboard Engine
• Chrysler M440SV (8 CYL) – Inboard Engine
• Hardin H240J (1990-1969) – Inboard Engine
• Hardin H240V (1990-1969) – Inboard Engine
• Hardin H295J (1976-1960) – Inboard Engine
• Hardin H295V (1976-1960) – Inboard Engine

That is the 25 most common of 387 applications NGK's charts list for this plug – ask us to check yours.

🔄 Supersession & Cross Reference

NGK's cross-reference tables list this plug against these part numbers.

• Autolite: 75, 76, AP85, XS85, XS85DP
• ACDelco: 41-833, B44S
• Champion: J13Y, J14YC
• Motorcraft: A52CU

📦 Condition

• Brand new genuine product
• Supplied in original packaging