Torx Flanged Button Head Screws — 18-8 Stainless Steel with Built-In Washer Flange, ISO 7380-2
Stripped hex sockets, loose washers falling out of alignment, and fasteners that rust after a single season outdoors — these are the frustrations that send engineers, fabricators, and serious DIYers searching for a better solution. Torx flanged button head screws in 18-8 stainless steel solve all three problems at once, making them a go-to choice for anyone building equipment, enclosures, or assemblies that need to stay tight and corrosion-free over the long haul.
Each pack contains ISO 7380-2 flanged button head screws machined from 18-8 (AISI 304) stainless steel. Thread sizes range from M2 (≈0.079") through M8 (≈0.315"), with lengths from 3mm (≈1/8") up to 80mm (≈3.15") depending on the variant. The integrated flange beneath the button head acts as a built-in flat washer, eliminating the need for a separate washer in most applications. Pack quantities range from 2 to 100 pieces to suit both one-off repairs and production runs.
These screws are well-suited for electronics enclosure assembly and rack-mount panel fastening where a low-profile head and tamper-resistant Torx drive are both needed; bicycle, motorcycle, and automotive trim work where stainless steel resists road salt and moisture; and furniture, cabinetry, and outdoor structures where a clean dome head profile and rust-free finish matter as much as holding strength.
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Compatibility: ISO metric thread standard (M-series), ISO 7380-2. Compatible with standard metric nuts, threaded inserts, and tapped holes. Requires a Torx (star) driver bit — T6 through T40 depending on screw size. Not compatible with Phillips, hex, or UNC/UNF inch-thread fasteners.
✅ Key Features of These Torx Flanged Button Head Screws
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18-8 Stainless Steel Construction: AISI 304 alloy resists rust, oxidation, and mild chemical exposure, making these screws a dependable choice for outdoor assemblies, humid environments, and applications where carbon steel would corrode.
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Torx Drive Recess: The 6-lobe Torx socket transfers torque more efficiently than Phillips or hex drives, reducing cam-out and bit slippage — especially useful in tight spaces or when driving at high speed with a power tool.
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Integrated Flange (Built-In Washer): The flanged head distributes clamping load over a wider footprint, reducing pull-through risk in softer materials like aluminum, plastic, and composites — no separate flat washer needed in most applications.
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Wide Size Selection: Available in M2 through M8 thread diameters and lengths from 3mm to 80mm, covering the most common metric machine screw sizes for electronics, fabrication, and light structural work.
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ISO 7380-2 Standard: Conforms to the international flanged button head screw standard, ensuring consistent head dimensions, thread pitch, and mechanical properties across all sizes for predictable assembly results.
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Flexible Pack Quantities: Choose from 2 to 100 pieces per order. Small packs suit prototyping and single-project repairs; larger packs reduce per-unit cost for production runs or workshop stock replenishment.
🎯 Who Is This For?
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Electronics & Enclosure Builders
Ideal for rack-mount panels, server enclosures, and PCB standoff assemblies where a low-profile head and Torx drive prevent accidental loosening and cam-out during assembly.
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Fabricators & Machinists
A reliable choice for aluminum extrusion frames, jigs, and fixtures where the flanged head eliminates loose washers and speeds up assembly on the shop floor.
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Cycling & Automotive Enthusiasts
Stainless steel construction resists road salt, moisture, and grime — perfect for bicycle components, motorcycle trim, and automotive interior panels exposed to the elements.
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DIY Home & Outdoor Projects
Use on outdoor furniture, garden structures, and cabinetry where a rust-free, clean dome-head finish is as important as long-term holding strength.
📐 Technical Specifications
| Material |
18-8 Stainless Steel (AISI 304) |
| Head Type |
Flanged Button Head (low-profile dome with integrated washer flange) |
| Drive Type |
Torx (6-lobe star recess) |
| Standard |
ISO 7380-2 |
| Thread Standard |
ISO metric coarse pitch (M-series) |
| Thread Sizes Available |
M2, M2.5, M3, M4, M5, M6, M8 |
| Length Range |
3mm (≈1/8") to 80mm (≈3.15") — varies by thread size; see variant options |
| Thread Pitch |
Standard ISO coarse pitch per size (e.g., M3 = 0.5mm, M4 = 0.7mm, M5 = 0.8mm, M6 = 1.0mm, M8 = 1.25mm) |
| Torx Bit Size |
Varies by screw size — typically T6 (M2) through T40 (M8); see variant options or contact us to confirm |
| Surface Finish |
Natural stainless (uncoated, passivated) |
| Corrosion Resistance |
Good — suitable for outdoor, humid, and mildly corrosive environments |
| Magnetic |
Slightly magnetic (18-8 stainless is weakly magnetic after cold working) |
| Pack Quantities |
2, 5, 10, 20, 50, 100 PCS — see variant options |
| Recommended Torque |
See variant options / Contact us to confirm for specific applications |
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Note: Exact head diameter, flange diameter, and drive size vary by thread size per ISO 7380-2. If you need precise dimensional drawings for engineering or CAD use, contact us to confirm before ordering.
❓ Frequently Asked Questions
How do I choose the right size and length for my application?
Match the thread diameter to your tapped hole or nut — M2 (≈0.079") for miniature assemblies up to M8 (≈0.315") for heavier structural work. For length, measure the total material thickness being clamped and add sufficient thread engagement — generally at least 1.5× the screw diameter. For example, an M4 screw through 6mm of material typically needs at least 6mm of thread engagement, so an M4×12mm or M4×14mm is a common choice.
How strong are 18-8 stainless steel screws compared to carbon steel?
18-8 stainless steel (AISI 304) is generally rated at a tensile strength of approximately 70,000–85,000 psi, which is lower than Grade 8 carbon steel but sufficient for most light-to-medium duty fastening applications. The key advantage is corrosion resistance — 18-8 stainless will not rust in typical indoor, outdoor, or mildly corrosive environments where carbon steel would fail.
Can these screws be used outdoors or in wet environments?
Yes. 18-8 stainless steel offers good corrosion resistance and is generally suitable for outdoor use, humid environments, and light marine-adjacent applications. For prolonged saltwater immersion or highly chlorinated environments, 316 stainless steel is typically recommended instead. Contact us to confirm suitability for your specific conditions.
What thread standard do these screws follow — are they compatible with standard metric nuts and inserts?
These screws conform to ISO 7380-2 and use standard ISO metric coarse thread (M-series). They are fully compatible with standard metric nuts, threaded inserts, and tapped holes of the corresponding size. They are not compatible with UNC/UNF (inch) threads.
What Torx bit size do I need to drive these screws?
The required Torx bit size varies by screw diameter. As a general guide: M2–M2.5 typically use T6 or T8; M3 typically uses T10; M4 typically uses T20; M5 typically uses T25; M6 typically uses T30; M8 typically uses T40. Always verify with the specific screw before driving to avoid stripping the recess.
What is the advantage of the flanged head over a standard button head screw?
The integrated flange acts as a built-in washer, distributing the clamping load over a larger surface area. This reduces the risk of the head pulling through softer materials like aluminum, plastic, or wood composites, and eliminates the need for a separate flat washer in most applications — saving assembly time and reducing part count.
How do I decide between buying 20 PCS vs. 100 PCS?
For a single project or prototype, the 10- or 20-piece pack is typically sufficient. For production runs, workshop stock, or repeat repairs, the 50- or 100-piece packs offer a lower per-unit cost. Check the variant pricing above to compare cost per screw across pack sizes before ordering.
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