M4 vs M6
They differ by 2.0 mm across the threads — enough that they are never interchangeable, but little enough that they are easy to mix up in a parts tray.
| M4 | M6 | |
|---|---|---|
| Thread diameter | 4.00 mm | 6.00 mm |
| Standard pitch | 0.7 mm | 1 mm |
| Tap drill | 3.3 mm | 5 mm |
| Clearance hole | 4.5 mm | 6.6 mm |
| Cap head Ø | 7 mm | 10 mm |
| Hex key | 3.0 mm | 5.0 mm |
| Torque into steel | 2.0-3.0 N·m | 7-10 N·m |
| Into plastic | 0.8-1.4 N·m | 2.5-4.0 N·m |
M4 is normally used for
Rack panels and cage nuts, monitors, VESA 75/100 plates, machine covers, e-bike parts
Everything M4 fits →M6 is normally used for
VESA 200 mounts, bike brake calipers, machine frames, heavy enclosures, furniture
Everything M6 fits →If you are not sure which one you have
Measure across the outside of the threads with a caliper. A reading within about 0.1 mm of the nominal size is your answer — 4.0 mm means M4, 6.0 mm means M6.
Use the screw size finder →Buy these screws at TechSpare Warehouse
In stock and shipped from South Carolina. Our black screws are Phillips wafer head (low profile); match the head style and length to the original before you order.
-
M4 x 25mm Black Wafer Head TV Stand Screws for Vizio V4K50M-0807, VQD50R-1007, VQP75C-84 & TCL 40S303, 43S303 – 8-Pack Replacement
$6.99Choose size -
M4 x 10mm Black Wafer Head Charging Port Screws for GOTRAX G3, G4, GMAX & GMAX Ultra – 10-Pack Replacement
$5.49Choose size -
M4 x 10mm Black Wafer Head Fender Clamp Base Screws for Minoura KODACHI DYK-1R Rear Fender – 8-Pack Replacement
$5.49Choose size -
M6 x 12mm Black Wafer Head TV Back-Panel Screws for Vizio VQD65R-1004, VQD70R-1001, VQM55C-1004, VQM65C-1004 – 8-Pack Replacement
$6.99Choose size -
M6 x 16mm Black Wafer Head Rack Screws for Rittal DK 7094.100 / 7094.110 / 7094.140 19-inch Rack – 20-Pack Replacement
$8.99Choose size -
M6 x 12mm Black Wafer Head Brake Line Screws for GOTRAX G3, G4, GMAX & GMAX Ultra – 8-Pack Replacement
$6.99Choose size
