15% OFF ORDERS $35+ | 20% OFF $100+ | ONLINE ONLY
USE CODE
FRESHCAR
*
Exclusions apply.
Advance Auto Parts Logo
Choose a Store
  • Shop All
  • Replacement Parts
  • Performance Parts
  • Accessories
  • Oil & Fluids
  • Special Offers
  • Advance Rewards
  • Advice & How-Tos
  • Project Guides
  • FAQ / Help Desk
Loading...
Share
Product thumb
Product thumb
Product main large
Loading...
How Would You Like To Get This Item?

Store Pickup

Loading...Loading...Loading...

Same Day Home Delivery

Loading...Loading...Loading...

Home Delivery

Loading...Loading...Loading...
Loading...
Loading...
Loading...Loading...Loading...Loading...Loading...

Product Information

Product Details
Part No. 91185
Product Features:
  • DESIGNED FOR RACING - Low angle tip design built to withstand extreme heat and vibration
  • RECOMMENDED USAGE - Racing use only, featuring special configurations and designs to ensure durability and ignitability
  • NGK's OE CERAMIC TECHNOLOGY - High grade alumina silicate ceramic creates a stronger insulator for optimal dielectric performance
  • SOLID COPPER CORE - 98 percent pure copper core offers superior heat dissipation, conductivity and ultra wide heat ranges
  • COLD-ROLLED THREADS - Prevents cross-threading and damage to cylinder heads
  • TRIVALENT METAL PLATING - Delivers superior anti-corrosion and anti-seizing properties, ensuring ease of installation and removal
Specifications
Center Electrode Core Material:
Copper

Center Electrode Design:
Fine Wire

Center Electrode Insulator Tip Projection:
0.02 in

Center Electrode Projection:
Non-Projected

Center Electrode Tip Material:
Iridium

Electrical Terminal Type:
Non-Removable Nut

Grade Type:
Performance

Ground Configuration:
Slant

Ground Electrode Core Material:
Platinum

Ground Electrode Quantity:
1

Ground Electrode Tip Design:
Pin Type

Ground Electrode Tip Material:
Platinum

Hex Size:
5/8" (16mm)

Insulator Height:
2.01 in

Insulator Material:
Ceramic

Manufacturer Heat Range:
10

Pre-Gap Size:
.028 in

Reach:
1.043 in

Resistance:
5000.0 ohm

Resistor Type:
Yes

Seat Type:
Flat

Skirt:
No

Skirt Length:
0.0 in

Thread Diameter:
0.472 in

Thread Size:
M12 - 1.25

Washer Type:
Crush

Washer(s) Included:
Yes
Loading...
Loading...Loading...Loading...Loading...Loading...
Loading...
Loading...
Loading...Loading...Loading...Loading...Loading...
No results
Loading...
Loading...Loading...Loading...Loading...Loading...
Feedback
Be The First To Know About Deals And Promotions.
Plus, create an account to receive $5 off of $20 or more.
TOP REPLACEMENT PARTS
Brake Pads & Shoes
Brake Rotors
Alternators
Water Pumps
Starters
Brake Calipers

Order Lookup

Help Desk

Store Locator

In Store Services

Mobile App

CUSTOMER SUPPORT
Accessibility Statement
Contact Us
Forgot Password
Help Desk
In Store Pickup
In Store Services
Order Tracking
Recall Information
Return Policy
Same Day Delivery
© 2026 Advance Auto Parts
Privacy Policy
Terms of Use
Site Map
ADVANCING A WORLD IN MOTION®