Flanged Button Head Socket Cap Screws 304 Stainless — Low-Profile Fasteners with Built-In Washer Bearing Surface
Reaching for a separate washer every time you drive a screw slows down assembly and adds parts to track. Flanged button head socket cap screws solve this by integrating a wide flange directly into the head, distributing clamping load without an extra component. Made from 304 stainless steel, these fully threaded machine screws are the go-to choice for engineers, fabricators, and DIYers who need a clean, low-profile fastener that holds securely in metal panels, plastic enclosures, and precision assemblies.
Each screw is machined from 304 stainless steel with a low-profile domed button head, an integrated flange washer, and a hex socket drive for positive torque transfer. Sizes range from M2 to M10, with lengths from 4mm (approx. 5/32") to 50mm (approx. 2"), available in packs of 10, 20, 25, 50, or 100. The fully threaded shank provides grip along the entire length, making these screws especially effective in thinner materials where partial threading would leave an unthreaded gap.
These flanged button head socket cap screws are widely used in CNC machine panel assembly, electronics enclosure mounting, automotive interior trim, 3D printer frame construction, and robotics builds — anywhere a low-profile hex drive fastener with a wide bearing surface is needed. The 304 stainless construction also makes them a reliable choice for outdoor equipment, food-adjacent fixtures, and humid environments where carbon steel would corrode.
🔩 Compatibility: ISO metric coarse thread (M2–M10). Compatible with standard metric nuts, threaded inserts, and tapped holes. Drive with a metric hex key (Allen wrench): 1.5mm (M2), 2mm (M3), 2.5mm (M4), 3mm (M5), 4mm (M6), 5mm (M8), 6mm (M10). Fully threaded throughout the shank.
⚠️ Note: 304 stainless can gall (seize) if over-torqued or driven too fast. Apply anti-seize compound or drive slowly when threading into stainless nuts or inserts. If you are unsure of the correct size for your application, please contact us to confirm before ordering.
✅ Key Features of These Flanged Button Head Socket Cap Screws
- 🛠️Integrated Flange Washer Head — The wide flange distributes clamping load over a larger surface area, reducing pull-through risk in softer or thinner materials and eliminating the need for a separate flat washer in most flanged button head screw applications.
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🔩Low-Profile Domed Button Head — The rounded button head sits closer to the surface than a standard hex cap screw, reducing snag points and providing a cleaner finished appearance in panels, covers, and visible assemblies.
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🔧Hex Socket Drive for Positive Torque — The internal hex (Allen) socket allows high torque transfer in tight spaces where a wrench cannot reach, making these screws ideal for recessed mounting points in CNC machine frames and electronics enclosures.
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✨304 Stainless Steel Construction — Resists rust, oxidation, and mild corrosion without surface coatings that can chip or wear. Suitable for indoor, outdoor, and humid environments where carbon steel fasteners would degrade over time.
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📏Fully Threaded Shank — Thread runs the full length of the screw, maximizing grip in thin materials and allowing use in through-hole applications without an unthreaded gap. Available in M2–M10 with lengths from 4mm (5/32") to 50mm (2").
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📦Flexible Pack Quantities — Available in packs of 10, 20, 25, 50, or 100 per size. Order a small pack for prototyping or repairs, or stock up in larger quantities for production runs and workshop inventory at a lower per-unit cost.
📐 Technical Specifications — Flanged Button Head Socket Cap Screws 304 Stainless
| Material |
304 Stainless Steel (A2) |
| Head Type |
Flanged Button Head (low-profile domed with integrated flange) |
| Drive Type |
Hex Socket (Allen / Internal Hex) |
| Thread Form |
ISO Metric Coarse, Fully Threaded |
| Available Sizes |
M2, M3, M4, M5, M6, M8, M10 |
| Available Lengths |
4mm (approx. 5/32") to 50mm (approx. 2") — see variant options |
| Pack Quantities |
10, 20, 25, 50, 100 pieces |
| Finish |
Natural stainless (no coating) |
| Magnetic |
Slightly magnetic (304 SS is weakly magnetic after cold working) |
| Corrosion Resistance |
Good — suitable for indoor, outdoor, and humid environments |
| Hex Key Size |
1.5mm (M2), 2mm (M3), 2.5mm (M4), 3mm (M5), 4mm (M6), 5mm (M8), 6mm (M10) |
| Tensile Strength |
Typically 500–700 MPa (304 SS grade dependent) |
| Standard |
ISO metric coarse thread profile |
| Country of Origin |
Contact us to confirm |
❓ Frequently Asked Questions
How do I choose the right length for a flanged button head screw?
A general rule: the screw length should equal the thickness of the material being clamped plus at least 1.5x the screw diameter of thread engagement in the receiving part. For example, an M5 screw (5mm diameter) typically needs at least 7–8mm of thread engagement. Lengths here run from 4mm (approx. 5/32") to 50mm (approx. 2"). Since these screws are fully threaded, the entire shank provides grip, making them well-suited for thinner materials where partial threading would leave an unthreaded gap.
What tensile strength do 304 stainless steel socket cap screws have?
304 stainless steel socket cap screws typically offer a tensile strength of around 500–700 MPa depending on the specific grade and manufacturing process. They are well-suited for medium-duty structural and mechanical fastening where corrosion resistance is also required. For higher-load applications, 316 or A4-80 stainless grades are generally recommended.
Are these screws suitable for outdoor or marine use?
304 stainless steel offers good corrosion resistance and is generally suitable for outdoor use in most environments, including moderate humidity and rain exposure. For coastal or marine environments with direct saltwater contact, 316 stainless steel is typically recommended as it provides superior chloride resistance. These screws are a solid choice for outdoor furniture, enclosures, and sheltered exterior fixtures.
What thread standard do these screws follow and are they compatible with standard metric nuts?
These screws use ISO metric coarse threads (M2 through M10), which are compatible with standard metric nuts, threaded inserts, and tapped holes following ISO 68-1 thread profiles. Metric coarse is the most common standard for these sizes in the US and internationally. Always verify the thread pitch of your receiving component before ordering.
What hex key (Allen wrench) size do I need?
The hex socket size follows standard ISO metric specifications: typically 1.5mm for M2, 2mm for M3, 2.5mm for M4, 3mm for M5, 4mm for M6, 5mm for M8, and 6mm for M10. Always use a well-fitting hex key to avoid rounding the socket recess, especially in stainless steel which can gall if over-torqued.
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, eliminates the need for a separate flat washer in most applications, and provides a cleaner, more finished appearance. It is particularly useful in sheet metal, plastic panels, and thin composite materials.
When should I choose flanged button head screws over standard socket cap screws?
Choose flanged button head screws when you need a low-profile head with a wider bearing surface, want to eliminate a separate washer, or are fastening into softer or thinner materials. Standard socket cap screws (hex head) are better when maximum clamping force or higher torque is required, as their taller head allows more torque to be applied. Flanged button heads are ideal for panels, covers, and assemblies where a clean, snag-free surface is important.
🛒 Select your thread diameter, length, and quantity above, then add to cart — ships from our US warehouse.
