Side-by-Side Comparison
Metric Threads (ISO)
M12 Thread vs. M2.5 Thread
Comparing 2 standards across 9 specifications. 9 key differences identified.
Comparing:
M12 Thread
M2.5 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.
M2.5 is an ISO metric machine screw thread with a nominal major diameter of 2.5 mm and a standard coarse pitch of 0.45 mm. Requiring a 2.05 mm tap drill, it is the standard fastener for 2.5-inch SATA/SAS hard drive caddies, Raspberry Pi mounting standoffs, and consumer drone frames.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Nominal Major Diameter
|
12.00 mm | 2.50 mm |
|
Standard Coarse Pitch
|
1.75 mm | 0.45 mm |
|
Minor Diameter (Internal)
|
10.106 mm | 2.013 mm |
|
Tensile Stress Area
|
84.3 mm² | 3.39 mm² |
|
Common Drive Size
|
19mm (ISO) / 18mm (DIN) / 10.0mm Allen | PH1 / T8 / 2.0mm Allen |
|
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
|
— | 2.05 mm (75% thread engagement) |