Standard Screw Sizes For Computers: Know The Basics

what is the standard screw size for computers

There are a few different screw sizes used in computers, but the most common type is the 6-32 screw. These screws are used for hard drives, power supplies, case covers, and more. The second most common type is the M3 screw, which is used for optical drives, floppy drives, and motherboards. Other screw sizes found in computers include M2 and 4-40 screws. The shape of the screw's head and its length can vary, but there are only three types of threads used: self-tapping, UNC 6-32, and M3x0.5.

Characteristics of Standard Computer Screw Sizes

Characteristics Values
Screw type 6-32, M3, M2, M3x0.5, 4-40
Screw use Hard drives, power supply, expansion cards, case panels, optical drives, floppy drives, motherboard, fans, ducts, case cover, I/O plates, motherboard standoffs, SSDs, VGA, DVI, serial ports, parallel ports, old game ports
Screwdriver type Phillips #1, Phillips #2, Socket wrench
Screw length 0.15", 0.25", 1/4", 3/16", 5mm, 4mm, 7/32", 10mm
Screw head shape Hex, pan, flat, round, knurled

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Screws for power supply, hard drives, expansion cards, and case panels

When building a computer, it is important to use the correct type of screw for each component. Most screws in a computer are UTS 6-32 screws, which are used for the power supply, 3.5" hard drives, securing expansion cards, and the case panels. These screws have a thread size of #6-32 and are typically cut to accept a #2 Phillips screwdriver. The length of these screws can vary, with standard lengths being 1/4" (6.35mm) for case covers and other metallic parts, and 3/16" (4.7625mm) for hard drives. It is important to use the correct length screw when attaching hard drives to avoid damaging the drive.

The other common screw type found in computers is the metric M3x0.5 screw, which uses a 3mm wire with a 0.5mm thread pitch and is cut for a #1 Phillips screwdriver. These screws are typically used for mounting optical drives, floppy drives, and the motherboard. It is important to note that the shape of the screw head can vary, but the thread type and length are the most important factors in selecting the correct screw.

When purchasing a computer case for assembly, it typically comes with a variety of screws and other small components. However, it is not uncommon for cases to be missing certain types of screws, particularly those for the power supply. Most electronics stores sell small bags of miscellaneous computer hardware screws, which can be used to supplement any missing or extra screws that may be needed during the building process.

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Screws for optical drives, floppy drives, and motherboards

Optical drives are typically secured with four screws, which are usually provided with the drive or the case. The screws are inserted from the sides of the drive bay, through the round screw holes on the bay's sidewalls.

Floppy drives typically use 4 mm-long screws with a round head, while motherboard screws can have either a thick or thin thread and a variety of head shapes. Motherboard screws should be screwed in using a #1 Phillips screwdriver.

It is important to note that the shape of the screw head is less important than its length. Using a screw that is too long can damage the hardware. For example, using a screw longer than 3/16" (4.7625 mm) to fasten a hard disk drive can chip or break the drive's printed circuit board.

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Screws for NVMe drives

When it comes to screws for NVMe drives, it's important to note that there isn't a single "standard" screw size that fits all computers. The thread size for an NVMe drive is usually M2x0.4, and many drives nowadays are secured with a tool-free design, such as a plastic lever that rotates. However, it's always a good idea to check the specific requirements for your NVMe drive and motherboard.

If you're looking to purchase screws for your NVMe drive, you can find kits available online, such as the SGTKJSJS M.2 Screw Kit, which includes hex head jackscrews, flat head screws, transparent screw washers, and a screwdriver. This particular kit is compatible with ASUS motherboards and has received positive reviews for its functionality, ease of installation, and value for money.

When installing an M.2 SSD, it's important to be cautious and not force the screw into place if it doesn't fit your system. Forcing the wrong threading or length can damage your hardware. Instead, consult your support resources or the manufacturer for the appropriate parts needed.

In addition to the M.2 screw kits, you may also need standoffs or spacers to elevate the NVMe drive and ensure a secure connection. These standoffs can be plastic or metallic and are placed between the metallic chassis of the case and the motherboard. It's important to use the correct screw size for these standoffs to avoid stripping or damaging your hardware.

Overall, while there isn't a universal standard, knowing the specific requirements for your hardware and taking the necessary precautions during installation will ensure a secure and compatible mounting solution for your NVMe drive.

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Screws for fans and lighting

When it comes to screws for fans and lighting, the standard screw size for computers is a self-tapping plastic screw. These screws are typically 10mm in length and have a flat head that accepts a #2 Phillips screwdriver. They are used exclusively for fastening fans and ventilation-related plastic parts like ducts to the computer case.

While self-tapping plastic screws are the standard for fans and lighting, it is worth noting that some fans use metal screws or alternative mounting systems. Rubber bungee fasteners, for example, are sometimes used instead of screws. Additionally, there are screwless fasteners available on the market, which can be a convenient option for those who want to avoid the hassle of dealing with screws altogether.

If you are looking for replacement screws for your computer fan, you can find them at various online retailers and hardware stores. It is recommended to have the exact measurements of the screws you need (length and diameter) before purchasing, as they can vary slightly in size. Standard fan screws typically have a length of around 10mm and a diameter between 2mm and 3mm.

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Screw types: UNC 6-32 and M3x0.5

UNC 6-32 and M3x0.5 are two types of screw thread found in computers.

UNC 6-32

The UNC 6-32 screw thread is a standard set by the United National Coarse standard. This means that it uses a #6 wire (0.1380”-diameter wire) with 32 threads per inch (0.0313” pitch). These screws are cut to accept a #2 Phillips screwdriver.

The UNC 6-32 screws are used for the power supply, 3.5" hard drives, securing expansion cards, and the case panels.

M3x0.5

The M3x0.5 screw thread is a standard set by ISO using the metric system. It uses a 3-mm wire with a 0.5-mm thread pitch. These screws are cut to accept a #1 Phillips screwdriver.

The M3x0.5 screws are used for mounting optical drives, floppy drives, and the motherboard.

Frequently asked questions

There are three main types of screw used in computers: 6-32 screws, M3 screws, and 4-40 screws. The 6-32 screw is the most common, used for power supplies, hard drives, case covers, and more. The M3 screw is the second most common, used for optical drives, floppy disk drives, and motherboards. The 4-40 screw is used for VGA, DVI, serial ports, parallel ports, and old game ports.

The 6-32 screw is a unified thread standard with a diameter of 3.505mm or 0.1380 inches, 32 threads per inch, and a length of 0.79375mm. The M3 screw is a metric screw with a diameter of 3mm or 0.12 inches and a standard pitch of 0.5mm.

Both 6-32 and M3 screws typically use a #2 Phillips-head screwdriver. 4-40 screws use a #1 Phillips-head screwdriver.

Computer case screws are used to secure the case cover and other metallic parts to the case. They are typically longer than other types of screws used in computers, such as those used for hard drives.

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