Gift CardContactAbout
0 My Cart

Your cart is currently empty.

Continue shopping
Total: $0.00
View cart
Toggle menu
0
  • Home
  • NGK - Iridium IX Spark Plug - 6509
-33%
NGK - Iridium IX Spark Plug - 6509
Load image into Gallery viewer, NGK - Iridium IX Spark Plug - 6509

Have Questions?

(425) 295-1665 Ask an Experts

  • Trusted by Racers

    Professional-grade parts used trackside.

  • Real Support, Real People

    Expert help during business hours.

  • Secure Shopping

    Encrypted checkout & trusted payments.

  • Fast U.S. Shipping

    Orders ship quickly from regional warehouses.

NGK - Iridium IX Spark Plug - 6509

NGK
NGK6509
In stock
Iridium Spark Plug
$17.99 $11.99
Description:The NGK Iridium IX 6509 Spark Plug is designed for performance-focused applications where consistent ignition and...
$11.99
NGK - Iridium IX Spark Plug - 6509
Description

Description:
The NGK Iridium IX 6509 Spark Plug is designed for performance-focused applications where consistent ignition and durability are important. It uses a fine-wire iridium center electrode (0.6 mm) to support a stable spark under demanding conditions, while iridium’s high melting point helps maintain electrode integrity over time in high-tech, high-performance engines.

This plug features trivalent metal plating for anti-corrosion and anti-seizing properties, corrugated ribs to help prevent flashover, and a pure alumina silicate ceramic insulator for strength and heat transfer. A copper core aids heat removal, and triple seals help prevent leakage for consistent operation. The 6509 is a resistor-type plug (5k ohm) with NGK heat range 6, a tapered seat, and a factory 0.043" (1.1 mm) gap.

Features:

  • Iridium IX fine-wire center electrode for stable spark and durability

  • Center electrode material: Iridium

  • Center electrode type: Fine wire (0.6 mm)

  • Center electrode projection: Projected

  • Ground electrode material: Nickel

  • Ground electrode shape: Taper cut (standard type)

  • Trivalent metal plating helps resist corrosion and seizing

  • Corrugated ribs help prevent flashover

  • Pure alumina silicate ceramic insulator for strength and heat transfer

  • Copper core aids heat removal

  • Triple seals help prevent leakage

  • Resistor: Yes (5k ohm)

  • Heat range: 6

  • Warranty: 60 days

  • Longevity: 50k miles

Specifications:

  • Thread diameter: 14 mm

  • Thread pitch: 1.25 mm

  • Seat type: Tapered

  • Reach: 25 mm (1")

  • Hex size: 5/8" (16 mm)

  • Terminal type: Solid

  • Gap: 0.043" (1.1 mm)

  • Torque specs: Cast iron 10.8–18 lb-ft; aluminum 7.2–14.5 lb-ft

Read More
Read Less

Shipping

Order Processing
All orders are processed and shipped within 24 hours of purchase (excluding weekends and holidays).
Orders placed after 3:00 PM EST may ship the following business day.

Shipping Methods
Customers select their preferred shipping method and speed at checkout.
Shipping times are determined by the carrier and cannot be guaranteed by us.
Tracking information will be provided once your order has shipped.

Shipping Coverage
If your package arrives damaged, please notify the delivery driver immediately and contact the shipping carrier to file a claim.
You must report any missing or damaged items within 14 days of delivery.
After this time, we cannot be held responsible for lost or damaged items.

Returns

Return Window
You have 30 days from the date of delivery to request a return.
After 30 days, we are unable to accept returns, exchanges, or refund requests.

Eligibility
Items must be returned in their original condition—unused, unwashed, and with all tags and packaging intact.
Certain products may not be eligible for return (e.g., special-order items, customized products, or perishable goods).
Items that have been altered, installed, or modified cannot be returned.

Return Process
Contact our Customer Support team to request a Return Authorization (RMA) before sending items back.
Once your return is approved, you’ll receive instructions on where to send the product.
Customers are responsible for return shipping costs unless the item was defective or incorrect.

Refunds
Refunds are issued to the original payment method once the returned item has been received and inspected.
Please allow 5–10 business days for the refund to appear on your account.
In some cases, a restocking fee may apply (if applicable, this will be disclosed during your return authorization).

Your cart

×