Side-by-Side Comparison
Metric Threads (ISO)
M12 Thread vs. M3 Thread
Comparing 2 standards across 9 specifications. 9 key differences identified.
Comparing:
M12 Thread
M3 Thread
M12 is an ISO metric machine screw thread with a nominal major diameter of 12.0 mm and a standard coarse pitch of 1.75 mm. Requiring a 10.20 mm tap drill, it provides high tensile clamping strength for automotive wheel hubs, structural steel connections, and industrial machine tool mounts.
M3 is an ISO metric machine screw thread with a nominal major diameter of 3.0 mm and a standard coarse pitch of 0.50 mm. Requiring a 2.50 mm tap drill, it is the world's most widely deployed fastener in 3D printers, consumer electronics, and PC 5.25-inch optical drive bays.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Nominal Major Diameter
|
12.00 mm | 3.00 mm |
|
Standard Coarse Pitch
|
1.75 mm | 0.50 mm |
|
Minor Diameter (Internal)
|
10.106 mm | 2.459 mm |
|
Tensile Stress Area
|
84.3 mm² | 5.03 mm² |
|
Common Drive Size
|
19mm (ISO) / 18mm (DIN) / 10.0mm Allen | PH1 / PH2 / 2.5mm Allen / T10 |
|
Fine Pitch (Automotive)
|
1.50 / 1.25 mm | — |
|
Tap Drill Diameter (Coarse)
|
10.20 mm (75% thread engagement) | — |
|
Fine Pitch (Optional)
|
— | 0.35 mm |
|
Tap Drill Diameter
|
— | 2.50 mm (75% thread engagement) |