Side-by-Side Comparison
Metric Threads (ISO)
M2 Thread vs. M2.5 Thread
Comparing 2 standards across 7 specifications. 7 key differences identified.
Comparing:
M2 Thread
M2.5 Thread
M2 is an ISO metric machine screw thread with a nominal major diameter of 2.0 mm and a standard coarse pitch of 0.40 mm. Requiring a 1.60 mm tap drill, it is the universal standard thread for M.2 NVMe solid-state drive mounting standoffs and laptop internal chassis fastening.
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
7 Parameters| Parameter / Spec | ||
|---|---|---|
|
Nominal Major Diameter
|
2.00 mm | 2.50 mm |
|
Standard Coarse Pitch
|
0.40 mm | 0.45 mm |
|
Fine Pitch (Optional)
|
0.25 mm | 0.35 mm |
|
Tap Drill Diameter
|
1.60 mm (75% thread engagement) | 2.05 mm (75% thread engagement) |
|
Minor Diameter (Internal)
|
1.567 mm | 2.013 mm |
|
Tensile Stress Area
|
2.07 mm² | 3.39 mm² |
|
Common Drive Size
|
PH0 / PH1 / T6 / T8 | PH1 / T8 / 2.0mm Allen |