Side-by-Side Comparison
Electrical & Ignition Standards
Automotive Blade Fuses vs. Spark Plug Threads & Dimensions
Comparing 2 standards across 15 specifications. 15 key differences identified.
Comparing:
Automotive Blade Fuses
Spark Plug Threads & Dimensions
Automotive blade fuses protect 12V/24V/48V vehicle electrical circuits, standardized under ISO 8820-3 / SAE J1284 into six physical form factors (Micro2, Micro3, Mini, Low-Profile Mini, Regular ATO/ATC, and Maxi) using universal color-coded amperage ratings from 1A to 80A.
Internal combustion engine spark plugs are standardized under ISO 1919 and SAE J548 into standard metric thread diameters (M10×1.0, M12×1.25, M14×1.25, M18×1.5), thread reaches (9.5mm to 26.5mm), hex wrench drive sizes (14mm, 16mm / 5/8", 21mm / 13/16"), and terminal configurations.
Specification Comparison Table
15 Parameters| Parameter / Spec | ||
|---|---|---|
|
Governing Standards
|
ISO 8820-3 / SAE J1284 (Blade Type) / SAE J2077 (Miniature) | ISO 1919 / ISO 2344 / ISO 28741 / SAE J548 |
|
Micro2 Fuse (Dual-Blade)
|
9.1 × 3.8 × 15.3 mm | 5A to 30A | Modern tight packaging standard | — |
|
Micro3 Fuse (Three-Blade)
|
14.4 × 3.8 × 18.0 mm | Dual circuits sharing one center power terminal | — |
|
Mini Fuse (ATM / APM)
|
10.9 × 3.6 × 16.3 mm | 2A to 30A | Common in 1990s–2010s vehicles | — |
|
Low-Profile Mini (APS / ATT)
|
10.9 × 3.8 × 8.7 mm | Ultra-short tabs flush with plastic housing | — |
|
Regular Fuse (ATO / ATC / APR)
|
19.1 × 5.1 × 18.5 mm | 1A to 40A | Universal benchmark standard | — |
|
Maxi Fuse (APX / MAX)
|
29.2 × 8.5 × 34.3 mm | 20A to 80A | High-current under-hood primary feeds | — |
|
Standard Operating Voltage
|
32V DC (Standard 12V/24V) / 58V DC (Specialty hybrid/48V mild hybrid) | — |
|
Standard Automotive Thread
|
— | M14 × 1.25 mm (dominates ~80% of passenger vehicle engines) |
|
Downsized Modern Engine Thread
|
— | M12 × 1.25 mm (modern turbocharged direct-injection engines) |
|
Small Engine / Powersports Thread
|
— | M10 × 1.0 mm (powersports, motorcycles, chainsaws) |
|
Heavy-Duty / Industrial Thread
|
— | M18 × 1.5 mm (vintage tractors, industrial stationary gas engines) |
|
Common Hex Drive Sizes
|
— | 14.0 mm (Bi-hex / 12-point), 16.0 mm (5/8" hex), 20.6 mm (13/16" hex) |
|
Standard Reach Depths
|
— | Short (9.5 mm / 3/8"), Standard (19.0 mm / 3/4"), Long Reach (26.5 mm / 1.04") |
|
Standard Spark Gap
|
— | 0.028"-0.032" (0.7-0.8 mm turbo) / 0.040"-0.044" (1.0-1.1 mm NA) |