NGK Iridium Spark Plug Box of 4 (SILKGR9A7EG)

SKU: NGK91731

High Ignitability Spark Plug

NGK Iridium...

Ngk

NGK Iridium Spark Plug Box of 4 (SILKGR9A7EG)

SKU: NGK91731

High Ignitability Spark Plug

NGK Iridium...

IN STOCK! Est Ship 3-5 days. This item is IN STOCK at one of our warehouses or distribution centres, the ETA is the approximate time required to prepare your order for dispatch.

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Description

NGK Laser Iridium plugs were designed specifically for the performance enthusiast. Fine wire center electrode ensures high durability and a consistently stable spark. Iridium alloy has an extremely high melting point, perfect for today's high-tech, high-performance engines.

Product Overview

2014-13 Mercedes-Benz C300, 2014-12 Mercedes-Benz C350, 2015 Mercedes-Benz C400, 2020-17 Mercedes-Benz C43 AMG, 2016 Mercedes-Benz C450 AMG, 2020-14 Mercedes-Benz CLA45 AMG, 2017-15 Mercedes-Benz CLS400, 2016-14 Mercedes-Benz E300, 2016-12 Mercedes-Benz E350, 2018-14 Mercedes-Benz E400, 2018-17 Mercedes-Benz E43 AMG, 2020-19 Mercedes-Benz E450, 2016-15 Mercedes-Benz GL450, 2019-15 Mercedes-Benz GLA45 AMG, 2020-17 Mercedes-Benz GLC43 AMG, 2018-16 Mercedes-Benz GLE350, 2019-16 Mercedes-Benz GLE400, 2019-17 Mercedes-Benz GLE43 AMG, 2016 Mercedes-Benz GLE450 AMG, 2018-16 Mercedes-Benz GLE550e, 2019-17 Mercedes-Benz GLS450, 2015-12 Mercedes-Benz ML350, 2015 Mercedes-Benz ML400, 2020-18 Mercedes-Benz S450, 2017-15 Mercedes-Benz S550e, 2020-19 Mercedes-Benz S560e, 2016-15 Mercedes-Benz SL400, 2020-17 Mercedes-Benz SL450, 2020-17 Mercedes-Benz SLC43 AMG

Features and Benefits

RECOMMENDED USAGE: Best for vehicles with OE SPE iridium alloy plugs

Product Details

Center Electrode Core Material:	Copper
Center Electrode Tip Material:	Iridium
Description:	NGK Laser Iridium High Ignitability Spark Plug
Electrical Terminal Type:	Cup
Ground Configuration:	Standard
Ground Electrode Core Material:	Copper
Ground Electrode Quantity:	1
Ground Electrode Tip Design:	Projected Square Platinum Electrode - High Ignitability
Hex Size:	14 Bi-Hex
Insulator Height:	51.00
Manufacturer Heat Range:	9
Part Number:	SILKGR9A7EG
Pre-Gap Size:	.028
Reach:	5.6
Resistance:	5500.0
Resistor Type:	Yes
Seat Type:	Flat
Stock Number:	91731
Thread Diameter:	12.00

Application Summary

Part Type

High Ignitability Spark Plug

Data: v4.2 - Upd: 2026-10-14 07:37:46

Features

Copper core aids in heat removal
Pure alumina silicate ceramic insulator provides superior strength and better heat transfer
RECOMMENDED USAGE: Best for vehicles with OE SPE iridium alloy plugs
Triple seals prevent leakage
Trivalent metal plating for superior anti-corrosion and anti-seizing properties

Specifications

Center Electrode Core Material:: Copper
Center Electrode Tip Material:: Iridium
Description:: NGK Laser Iridium High Ignitability Spark Plug
Electrical Terminal Type:: Cup
Ground Configuration:: Standard
Ground Electrode Core Material:: Copper
Ground Electrode Quantity:: 1
Ground Electrode Tip Design:: Projected Square Platinum Electrode - High Ignitability
Hex Size:: 14 Bi-Hex
Insulator Height:: 51.00
Manufacturer Heat Range:: 9
Part Number:: SILKGR9A7EG
Pre-Gap Size:: .028
Reach:: 5.6
Resistance:: 5500.0
Resistor Type:: Yes
Seat Type:: Flat
Stock Number:: 91731
Thread Diameter:: 12.00

Reference Information

Brand Name/s	Ngk
StreetFX SKU	ngk91731
SFX Item ID	4150231
Supplier Item Code	4150231
Manufacturer SKU	91731
Manufacturer UPC	87295917312
Alternative References	(SILKGR9A7EG)