The NGK BP6ES spark plug has a spanner size of 20.8 mm, a thread size of M14 x 1.25, and a thread length of 19.0 mm. These dimensions are crucial for ensuring compatibility and proper fit within an engine's cylinder head.
Detailed Specifications of the NGK BP6ES
Understanding the specific measurements of a spark plug like the NGK BP6ES is essential for automotive maintenance, as selecting the correct size prevents damage to the engine and ensures optimal performance.
Here are the precise dimensions:
| Characteristic | Measurement |
|---|---|
| Spanner Size | 20.8 mm |
| Thread Size | M14 x 1.25 |
| Thread Length | 19.0 mm |
Breaking down these dimensions:
- Spanner Size (20.8 mm): This refers to the hexagonal size of the spark plug's body, which dictates the size of the spark plug wrench or socket required for installation and removal. A 20.8 mm spanner size is equivalent to a 13/16 inch socket in imperial measurements, which is a common size for many spark plugs.
- Thread Size (M14 x 1.25): This describes the diameter and pitch of the spark plug's threads. "M14" indicates a metric thread with a nominal diameter of 14 millimeters. "1.25" is the thread pitch, meaning the distance between threads is 1.25 millimeters. This specification is critical for mating correctly with the cylinder head's threaded bore.
- Thread Length (19.0 mm): This measurement specifies the length of the threaded portion of the spark plug. It ensures the spark plug reaches the correct depth within the combustion chamber without fouling or interfering with the piston. A 19.0 mm thread length is often referred to as a "reach" of 3/4 inch.
Beyond these core dimensions, the NGK BP6ES also features an unscrewable SAE connector and a nickel middle electrode, both standard characteristics for a reliable spark plug designed for general automotive applications. The unscrewable SAE connector allows for versatility in connecting the spark plug to different types of ignition cables, while the nickel middle electrode offers good durability and performance for standard operating conditions.
