Side-by-Side Comparison
Metric Threads (ISO)
M1.6 Thread vs. M2.5 Thread
Comparing 2 standards across 8 specifications. 8 key differences identified.
Comparing:
M1.6 Thread
M2.5 Thread
M1.6 is a miniature ISO metric machine screw thread with a nominal major diameter of 1.6 mm and a standard coarse pitch of 0.35 mm. Requiring a 1.25 mm tap drill, it is the standard fastening thread for precision optical equipment, wristwatches, and micro-electronic assemblies.
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
8 Parameters| Parameter / Spec | ||
|---|---|---|
|
Nominal Major Diameter
|
1.60 mm | 2.50 mm |
|
Standard Coarse Pitch
|
0.35 mm | 0.45 mm |
|
Fine Pitch (Optional)
|
0.20 mm | 0.35 mm |
|
Tap Drill Diameter
|
1.25 mm (75% thread engagement) | 2.05 mm (75% thread engagement) |
|
Minor Diameter (Internal)
|
1.221 mm | 2.013 mm |
|
Tensile Stress Area
|
1.27 mm² | 3.39 mm² |
|
Thread Profile Angle
|
60 degrees | — |
|
Common Drive Size
|
— | PH1 / T8 / 2.0mm Allen |