The Google Nest Doorbell (1st gen, wired) and the Nest Hello wired doorbell secure its doorbell wires with M3 x 4mm terminal screws. These are our best-selling smart-home part. Each is a Phillips flat head, low-profile screw in black oxide carbon steel.
| Device / location | Screw | Buy |
|---|---|---|
| Google Nest Doorbell (1st gen) / Nest Hello wiring terminals | M3 x 4mm Phillips flat head | 10-pack, $4.99 · singles |
Before you start: doorbells run on low-voltage wiring from a transformer. Turn the doorbell circuit off at the breaker before you loosen terminal screws.
How to check the size in 30 seconds
- Thread: M3 means the threaded shank is 3 mm across; M2.5 is 2.5 mm. They look alike, so hold the old screw against a ruler or use calipers.
- Length: measure from under the head to the tip.
- Head: our smart-home screws are Phillips flat head (low profile), black oxide carbon steel.
Not sure? Send us a photo of the screw next to a ruler and your device model before you order.
Wall and mounting screws
The terminal screws are different from the screws that hold the doorbell plate to the wall. Our Google Nest Doorbell screw size guide covers terminal and wall screws for each Nest Doorbell model.
Related smart-home screws
- Ring Doorbell (1st gen) terminal screws (M3 x 4mm)
- Eufy HomeBase 3 and Eufy camera screws
- Smart lock keypad battery cover screw
- All smart-home and security device screws
Singles: single screws are $0.10 each and the cart needs at least $4.99 per line, so singles are added 50 at a time ($5.00). For one doorbell, the 10-pack is usually the simpler choice.
Shipping and returns: free US shipping on orders of $25 or more; orders ship within 24 hours (Mon–Sat) from South Carolina with tracking, and US delivery takes 1–5 business days after dispatch. 30-day returns.
FAQ
What screw size does the Google Nest Doorbell use for the wires?
The Google Nest Doorbell (1st gen, wired) terminal screws are M3 x 4mm Phillips flat head.
Does it fit the Nest Hello?
Yes. Our Nest listing names the Google Nest Hello wired doorbell wiring terminals as well as the Google Nest Doorbell (1st gen).
I lost one terminal screw. What should I buy?
The M3 x 4mm 10-pack ($4.99) gives you spares. Five packs ($24.95) plus any other item reach the $25 free US shipping threshold.