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home > Countersunk Hex Socket Screws – A2 Stainless Steel, M2 to M16, DIN 7991, Fully Threaded > Countersunk Hex Socket Screws – A2 Stainless Steel, M2 to M16, DIN 7991, Fully Threaded

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Countersunk Hex Socket Screws – A2 Stainless Steel, M2 to M16, DIN 7991, Fully ThreadedProduct Overview: Countersunk Hex Socket Screws A2 Stainless Steel (M2 to M16) For a truly flush finish that hides the fastener entirely, countersunk hex socket screws are the professionals choice. These A2 (304) stainless steel machine screws feature a 90 flat head that sinks perfectly into countersunk holes leaving a smooth, snagfree surface. The internal hex drive (Allen key) gives you excellent torque control with zero camout, making them ideal

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🔩 Product Overview: Countersunk Hex Socket Screws – A2 Stainless Steel (M2 to M16)

For a truly flush finish that hides the fastener entirely, countersunk hex socket screws are the professional’s choice. These A2 (304) stainless steel machine screws feature a 90° flat head that sinks perfectly into countersunk holes – leaving a smooth, snag‑free surface. The internal hex drive (Allen key) gives you excellent torque control with zero cam‑out, making them ideal for machinery, furniture, marine hardware, and precision assemblies. Available in metric diameters from M2 up to M16, with lengths to suit your application (total length includes head). Manufactured to DIN 7991 / ISO 10642 standards. Corrosion‑resistant, high strength, and ready for demanding environments.

✨ Why Choose A2 Stainless Countersunk Hex Socket Screws

A2 stainless steel (304 grade) – Excellent corrosion, oxidation, and heat resistance. High strength and superior toughness for long‑term reliability.
Countersunk flat head (90°) – Sits flush with the surface after countersinking. Perfect for panels, decks, and visible assemblies where a clean look is required.
Hex socket (Allen) drive – Internal hex provides positive engagement, eliminates cam‑out, and allows high torque without stripping the recess.
Wide metric range: M2, M2.5, M3, M4, M5, M6, M8, M10, M12, M16 – From tiny electronics fasteners up to structural bolts for heavy machinery.
Fully threaded (most sizes) – Threads run the entire length for maximum grip in thin materials. Length measured as total screw length including the head.
High precision – DIN 7991 / ISO 10642 – Consistent head dimensions and thread geometry. See detailed table below for exact specs.
Wide application range – Machinery, furniture, marine hardware, automotive, electronics, and general fabrication.

📏 Technical Specifications – Countersunk Hex Socket Screws (DIN 7991 / ISO 10642)

Screw Size (d)	Thread Pitch (p)	Head Thickness (k)	Head Diameter (dk)	Hex Socket Size (s)
M2	0.4	1.9	4.0	1.3
M2.5	0.45	2.5	5.0	1.5
M3	0.5	2.5	6.0	2.0
M4	0.7	3.4	8.0	2.5
M5	0.8	4.1	10.0	3.0
M6	1.0	4.9	12.0	4.0
M8	1.25	6.2	16.0	5.0
M10	1.5	7.6	20.0	6.0
M12	1.75	9.6	24.0	8.0
M16	2.0	10.0	29.0	10.0

Note: Dimensions in mm. Length measured as total screw length including head. For M1.6, please see specific product options. All data manually measured – slight variations may occur.

❓ FAQs – Countersunk Hex Socket Screws

🔸 What is the difference between countersunk and flat head? Are they the same?

Yes – in fasteners, “countersunk” and “flat head” are often used interchangeably. Both refer to a 82° or 90° tapered head designed to sit flush in a countersunk hole. These screws have a 90° included angle (standard for metric countersunk screws).

🔸 How is length measured for countersunk screws?

For countersunk screws, length is measured as total screw length including the head – from the top of the flat head to the tip. For example, an M6 x 20mm screw is 20mm long overall. This matches the standard for DIN 7991/ISO 10642. Countersunk holes should be drilled to accommodate the full length.

🔸 Will A2 (304) stainless steel rust outdoors or in marine environments?

A2 stainless is highly resistant to moisture, rain, and humidity – perfect for most outdoor use. For direct saltwater immersion or heavy coastal spray, A4 (316) stainless is better. For general outdoor machinery, furniture, and structural applications, 304 lasts for years without rust.

🔸 What hex key (Allen wrench) size do I need for each screw diameter?

Refer to the table: M2–M2.5 use 1.3–1.5mm, M3 uses 2mm, M4 uses 2.5mm, M5 uses 3mm, M6 uses 4mm, M8 uses 5mm, M10 uses 6mm, M12 uses 8mm, M16 uses 10mm. A quality metric hex key set (1.5mm to 10mm) will cover all these sizes.

🔸 Can I use these screws with nuts, or are they for tapped holes only?

These are standard machine screws – they work perfectly with matching metric nuts or in pre‑tapped holes. For a flush finish, you would typically use them in countersunk holes without nuts. For through‑hole applications, pair with A2 stainless nuts and washers.

🔸 What lengths are available for each diameter?

Lengths vary by size – typical ranges: M2–M3: 4–20mm, M4–M5: 6–30mm, M6–M8: 10–50mm, M10–M12: 16–80mm, M16: 25–100mm. Please select your desired length from the dropdown options. If you need a length not listed, contact us.

Countersunk Hex Socket Screws – A2 Stainless Steel, M2 to M16, DIN 7991, Fully Threaded

Name: Countersunk Hex Socket Screws – A2 Stainless Steel, M2 to M16, DIN 7991, Fully Threaded
Brand: auxtoursdunmonde.com
SKU: 47715971163
Price: 22.10 USD
Availability: InStock
Rating: 4.1683 (1582 reviews)