Side-by-Side Comparison
Metric Threads (ISO)
M1.6 Thread vs. M4 Thread
Comparing 2 standards across 8 specifications. 8 key differences identified.
Comparing:
M1.6 Thread
M4 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.
M4 is an ISO metric machine screw thread with a nominal major diameter of 4.0 mm and a standard coarse pitch of 0.70 mm. Requiring a 3.30 mm tap drill, it is the mandated standard fastener for VESA MIS-D (75×75 mm and 100×100 mm) computer monitor and small TV wall mounting brackets.
Specification Comparison Table
8 Parameters| Parameter / Spec | ||
|---|---|---|
|
Nominal Major Diameter
|
1.60 mm | 4.00 mm |
|
Standard Coarse Pitch
|
0.35 mm | 0.70 mm |
|
Fine Pitch (Optional)
|
0.20 mm | 0.50 mm |
|
Tap Drill Diameter
|
1.25 mm (75% thread engagement) | 3.30 mm (75% thread engagement) |
|
Minor Diameter (Internal)
|
1.221 mm | 3.242 mm |
|
Tensile Stress Area
|
1.27 mm² | 8.78 mm² |
|
Thread Profile Angle
|
60 degrees | — |
|
Common Drive Size
|
— | PH2 / PZ2 / 3.0mm Allen / T20 |