The standard m.2 SSD screw size is an M2 screw, meaning it has a 2mm thread diameter and a 0.4mm thread pitch. The most common length you will need is M2x3mm, which refers to the 3mm length of the threaded portion.
Where to find your M.2 screw
Before you search for a replacement, check the accessory bag that came with your motherboard. M.2 SSDs generally do not come with mounting screws; these are usually supplied with the motherboard or pre-installed in ready-built systems. Motherboard manufacturers typically provide the M.2 standoff and screw, either pre-installed on the motherboard or included in the accessory bag. SSD manufacturers like Samsung and Crucial generally do not include the mounting screws with their M.2 SSDs, so your motherboard is the first and most reliable source.
How to install an M.2 SSD with the correct screw
Once you have the correct M2 screw, installation is a straightforward process that requires care to avoid damaging the drive or motherboard.
Step 1: Prepare and locate the M.2 slot
Power off your computer and disconnect it from the power source. Locate the M.2 slot on your motherboard. The slot will have a small metal cylinder next to it called a standoff. This standoff is what the screw will thread into. If the standoff is not already installed in the correct hole for your SSD's length, you will need to move it to the appropriate position.
Step 2: Insert the M.2 SSD
Hold the M.2 SSD by its edges and align the notched edge with the keying on the slot. Insert the drive at a slight angle (around 30 degrees) and gently push it into the slot until the gold contacts are fully seated and not visible. The drive should sit flat against the standoff.
Step 3: Secure the drive with the screw
Place the M2 screw into the small notch at the end of the M.2 SSD. Use a Phillips-head screwdriver to turn the screw clockwise until it is snug. Do not overtighten; the screw should hold the drive firmly in place without applying excessive pressure. A good rule of thumb is to turn it until you feel resistance, then give it a small quarter-turn more.
Step 4: Verify the installation
Gently press down on the SSD to confirm it is secured and does not move. The drive should be parallel to the motherboard, not lifted at one end. If it is loose or angled, remove the screw and repeat the insertion process, ensuring the drive is fully seated in the slot.
Where to buy replacement M.2 screws
If you have lost the original screw or did not receive one with your motherboard, you have several options for finding a replacement. First, check the manufacturer's website for your motherboard; they often sell spare parts or provide them upon request. Local computer hardware stores or electronics shops frequently carry screw kits that include M.2 screws. Online retailers like Amazon and Newegg are also reliable sources, search for "M.2 SSD screw kit" to find a variety of options. When purchasing, ensure the kit explicitly states it contains M2 screws with a 0.4mm pitch to guarantee compatibility.
Avoiding damage from the wrong screw
Using the wrong size screw or forcing it can lead to loose connections, damage to the SSD, or damage to the motherboard. If you attempt to use a larger screw, you will strip the threads on the standoff or crack the SSD's circuit board. Conversely, a screw that is too long can protrude through the standoff and short-circuit the motherboard. If the screw does not thread smoothly with minimal resistance, stop immediately and verify that you have the correct M2x0.4 screw. The precise fit is critical because the screw provides both the physical stability and the grounding path for the drive, so a forced or incorrect screw can lead to intermittent failures or permanent hardware damage.
