Black & Silver KB4–KB5 Flat Countersunk Phillips Head Screw for PC Case Cooler Fan Mounting

Black & Silver KB4–KB5 Flat Countersunk Phillips Head Screw for PC Case Cooler & Fan Mounting

The KB4 and KB5 flat countersunk Phillips head screws are the standard specification fasteners for PC case fan mounting, CPU cooler installation, and heatsink bracket assembly. Available in both black and silver finishes to match your build aesthetic, these screws are compatible with all standard ATX cases, 80mm–120mm fans, and heatsink brackets.

Key Specifications

Why Choose KB4/KB5 Fan Mounting Screws?

• Standard PC specification — KB4/KB5 is the industry-standard screw for 80mm, 92mm, and 120mm PC case fan mounting
• Flat countersunk head — sits flush with fan frame; no protruding head to obstruct airflow or interfere with fan blades
• Black & silver options — match your build’s colour scheme; black for dark builds, silver for classic or white builds
• Self-tapping thread — threads directly into fan frame plastic mounting holes; no nut required
• Pack quantities — available in practical quantities for single builds or bulk workshop stock

Typical Applications

• PC case fan mounting (80mm, 92mm, 120mm, 140mm fans)
• CPU cooler and heatsink bracket installation (Intel LGA1700, LGA1200, AM4, AM5)
• Radiator fan mounting in AIO and custom water cooling loops
• Case fan controller and fan hub mounting
• ATX, mATX, ITX case assembly and fan replacement
• Server chassis and rack-mount fan replacement

Compatible With

• Standard 80mm, 92mm, 120mm, 140mm PC case fans (4-pin PWM and 3-pin)
• ATX, mATX, Mini-ITX, E-ATX case fan mounting positions
• CPU coolers: Noctua, be quiet!, Cooler Master, Deepcool, Thermalright heatsink brackets
• AIO radiators: NZXT, Corsair, Arctic, Lian Li 240mm/360mm radiator fan mounts
• Phillips #1 and #2 screwdrivers

Package Contents

• KB4/KB5 fan mounting screws in selected colour and quantity (per variant)

Frequently Asked Questions

Q: What is the difference between KB4 and KB5 screws?

A: KB4 and KB5 refer to slightly different length specifications of the standard PC fan mounting screw. KB4 is typically used for standard fan frame thickness, while KB5 is slightly longer for thicker fan frames or radiator mounting with a gasket. Check your fan or cooler manual for the recommended specification.

Q: Will these fit all PC case fans?

A: Yes. KB4/KB5 screws are the universal standard for PC case fan mounting. They are compatible with all major fan brands (Noctua, be quiet!, Corsair, Arctic, Cooler Master, Deepcool, Lian Li) and all standard ATX case fan positions.

Q: Do I need a nut with these screws?

A: No. KB4/KB5 screws are self-tapping and thread directly into the plastic mounting holes on the fan frame. No nut is required.