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When a standard Phillips screw strips mid-assembly or a hex drive rounds out under torque, the job stops. Engineers, fabricators, and serious DIYers who work with steel panels, machinery housings, and structural brackets need a fastener that holds its drive geometry under high torque — and sits perfectly flush when fully seated. These Torx countersunk machine screws are built for exactly that scenario.
Each screw features a flat (countersunk) head with an 90° included angle, a six-lobe Torx drive recess, and is manufactured to Grade 10.9 — one of the highest strength classes in the metric fastener system. The black oxide finish gives a clean, low-reflectance appearance. Available in thread diameters M3, M4, M5, M6, M8, and M10, with lengths ranging from 4mm (≈5/32") to 40mm (≈1-9/16"), sold in packs of 2, 5, 10, 20, 50, or 100 pieces depending on size.
Typical use cases include flush-mounting steel cover plates and access panels, assembling CNC machine frames and linear rail brackets, securing automotive interior trim and underbody components, and fastening electronics enclosures where a recessed head is required. The Torx drive makes these screws well-suited for power-tool installation in production environments where cam-out would cause rework.
| Drive Type | Torx (Six-Lobe / T-Star) |
|---|---|
| Head Style | Countersunk (Flat Head), 90° included angle |
| Thread Standard | ISO Metric Coarse (DIN 965 profile) |
| Thread Diameters | M3, M4, M5, M6, M8, M10 |
| Available Lengths | 4mm (≈5/32") – 40mm (≈1-9/16"); see variant options for size-specific availability |
| Material | Carbon Steel |
| Property Class / Grade | 10.9 |
| Minimum Tensile Strength | 1040 MPa (typically) |
| Surface Finish | Black Oxide |
| Pack Quantities | 2, 5, 10, 20, 50, or 100 PCS (availability varies by size) |
| Length Measurement | Overall length, tip to top of head (countersunk style) |
| Country of Origin | See variant options |
For countersunk (flat-head) screws, the length is measured from the top of the head to the tip. As a general rule, choose a length equal to the material thickness plus the depth of the tapped hole or nut. For example, if you're fastening a 3mm panel into a 10mm tapped boss, an M4 × 12mm (≈0.47") screw is typically appropriate. Always confirm thread engagement is at least 1× the screw diameter for steel-into-steel applications.
Grade 10.9 is a high-strength metric property class with a minimum tensile strength of 1040 MPa and a proof load strength of approximately 830 MPa. These screws are generally suitable for structural and high-load mechanical assemblies where standard Grade 8.8 fasteners may be insufficient. Always verify load requirements against your specific application.
These screws feature a black oxide finish, which provides mild corrosion resistance and reduces light reflection. Black oxide is generally suitable for indoor or lightly protected environments. For prolonged outdoor exposure, high-humidity conditions, or contact with chemicals, additional sealing (e.g., thread sealant or grease) or a stainless steel alternative is typically recommended.
These screws follow the ISO metric coarse thread standard (DIN 965 / ISO 7046 profile for countersunk heads). They are compatible with standard metric tapped holes and metric nuts of the corresponding size (M3, M4, M5, M6, M8, or M10). They are not compatible with UNC/UNF inch threads or fine-pitch metric variants.
Torx (six-lobe) bit sizes typically correspond to screw diameter as follows: M3 → T10, M4 → T20, M5 → T25, M6 → T30, M8 → T40, M10 → T45. Confirm with your specific fastener before use, as head dimensions can vary slightly by manufacturer. Using an incorrect Torx size risks damaging the drive recess.
No. These screws require a Torx (T-star / six-lobe) driver bit. They are not compatible with Phillips, Pozidriv, or hex (Allen) drivers. The Torx drive is intentional — it provides significantly better torque transfer and cam-out resistance compared to Phillips or slotted drives, which is especially important when using a power driver.
Match the screw diameter to your existing tapped hole or nut size. For light-duty electronics or thin sheet metal, M3–M4 is generally appropriate. For structural brackets, machinery panels, or automotive components, M5–M8 is more common. M10 is typically used in heavy-duty structural or industrial applications. When in doubt, contact us to confirm the right size for your project.
