A2 Stainless Steel Slotted Countersunk Screws DIN 963 | M4 M5 M6 - HomeDIYer

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A2 Stainless Steel Slotted Countersunk Screws DIN 963 – M4 M5 M6, 6–60mm

Name: A2 Stainless Steel Slotted Countersunk Screws DIN 963 – M4 M5 M6, 6–60mm
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Price: 3.17 USD
Availability: InStock

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Diameter × Thread Length: M4 x 6mm

Quantitys: 20Pcs

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A2 Stainless Steel Slotted Countersunk Screws DIN 963 — Flush-Fit Fasteners for Clean, Corrosion-Resistant Assemblies

When your project demands a fastener that disappears into the surface — no protruding head, no snagging, no rust — standard hardware store screws often fall short. DIYers, woodworkers, fabricators, and maintenance professionals who work with metal panels, cabinetry, electronics enclosures, or outdoor fixtures need a reliable slotted countersunk machine screw that sits perfectly flush and holds up over time. These A2 stainless steel slotted countersunk screws are built for exactly that.

Each screw is manufactured to DIN 963 specifications in A2 stainless steel (equivalent to 304 grade), featuring a fully threaded shank with ISO metric coarse threads and a flat 90° countersunk head with a single slotted drive. Available in thread sizes M4, M5, and M6, with lengths ranging from 6mm (≈1/4") to 60mm (≈2-3/8"), and sold in quantities of 2 to 500 pieces per order to suit both one-off repairs and bulk production runs.

These slotted countersunk machine screws are widely used for flush-mounting panels to aluminum extrusions, securing hardwood joinery where a clean face is required, assembling electronic enclosures and instrument housings, and attaching fixtures to outdoor structures where corrosion resistance matters. Their DIN 963 flat head profile is also a common choice for furniture hardware, signage mounting, and light fabrication work.

🔩 Compatibility: ISO metric coarse thread (M4, M5, M6) — fits standard metric nuts, threaded inserts, and tapped holes per ISO 68-1. Requires a flat-blade (slotted) screwdriver. Countersink angle: 90°.

✅ Key Features of These A2 Stainless Slotted Countersunk Screws DIN 963

🦀A2 Stainless Steel Construction: Made from 304-grade stainless steel for reliable corrosion resistance in indoor, outdoor, and mildly humid environments without surface coatings that can chip or flake.
📐DIN 963 Flat Head Profile: The 90° countersunk head sits flush with or below the material surface, eliminating snag points and delivering a clean, finished look on panels, wood, and enclosures.
🔧Slotted Drive for Controlled Torque: The single-slot drive allows precise, low-torque installation with a standard flat-blade screwdriver — ideal for soft materials like aluminum and plastic where over-driving is a concern.
📏Wide Size Range in One Listing: Thread sizes M4, M5, and M6 with lengths from 6mm to 60mm cover the most common metric machine screw applications, reducing the need to source from multiple suppliers.
📦Flexible Quantity Options: Order as few as 2 pieces for a quick repair or up to 500 for production and bulk stocking, with per-unit cost scaling down at higher quantities.
⚙️Fully Threaded Shank: The full-length thread engagement maximizes holding strength across the entire fastened thickness, making these screws well-suited for thin-material assemblies and through-bolted connections.

🎯 Who Is This For?

🪵 Woodworkers & Cabinet Makers

Achieve a flush, snag-free surface on hardwood joinery, cabinet faces, and furniture panels where a protruding screw head is unacceptable.

🔌 Electronics & Enclosure Builders

Secure instrument housings, control panels, and electronic enclosures with a clean flat-head fastener that won't interfere with covers or gaskets.

🏗️ Fabricators & DIY Metalworkers

Mount aluminum panels, angle brackets, and sheet metal assemblies with a corrosion-resistant screw that delivers a professional flush finish.

🌿 Outdoor & Garden Project Builders

Use A2 stainless steel's weather resistance for signage, outdoor fixtures, and garden structures where rust-free performance is required year-round.

Standard	DIN 963 (ISO 2009)
Material	A2 Stainless Steel (304 grade)
Head Type	Countersunk (Flat), 90° angle
Drive Type	Slotted (Single Slot)
Thread Type	ISO Metric Coarse (M4, M5, M6)
Thread Sizes Available	M4, M5, M6
Length Range (M4)	6mm (≈1/4") – 50mm (≈2")
Length Range (M5)	8mm (≈5/16") – 60mm (≈2-3/8")
Length Range (M6)	8mm (≈5/16") – 60mm (≈2-3/8")
Length Measurement	Overall length (head top to tip)
Shank	Fully threaded
Finish	Mill finish (natural stainless)
Tensile Strength	Typically ~700 MPa (A2-70 class)
Quantity Options	2, 5, 10, 20, 50, 100, 200, 500 pcs
Country of Origin	Contact us to confirm
RoHS / REACH	Contact us to confirm

⚠️ Sizing note: For countersunk screws, length is measured from the top of the flat head to the tip of the screw — not from under the head. Please account for this when selecting your length.

❓ Frequently Asked Questions

How do I choose the right length for a countersunk screw?

Generally, the screw length should equal the thickness of the material being fastened plus enough thread engagement in the receiving material — typically 1.5× the screw diameter. For example, an M5 screw going through a 10mm (≈3/8") panel into wood or metal should be at least 18–20mm (≈3/4") long. Note that for countersunk screws, length is measured from the top of the head to the tip, so the full length is embedded in the material.

What strength grade are these A2 stainless steel screws?

A2 stainless steel typically corresponds to property class A2-70, with a tensile strength of approximately 700 MPa. This is generally sufficient for light-to-medium duty fastening in non-structural assemblies such as panel mounting, cabinetry, enclosures, and general fabrication. For heavy structural loads, consult an engineer.

Can these screws be used outdoors or in wet environments?

A2 stainless steel offers good corrosion resistance and is generally suitable for outdoor use in mild to moderate environments — resisting rust and oxidation in most weather conditions. For highly corrosive environments such as coastal, marine, or chemical exposure settings, A4 (316) stainless steel is typically recommended instead.

What thread standard do these screws use, and what are they compatible with?

These screws conform to DIN 963 and use standard ISO metric coarse threads (M4, M5, M6). They are compatible with standard metric hex nuts, nylon lock nuts, threaded inserts, and tapped holes following the ISO 68-1 thread profile. They are not compatible with UNC/UNF (imperial) threads.

What screwdriver size do I need for slotted countersunk screws?

These screws require a flat-blade (slotted) screwdriver. For M4 screws, a blade width of approximately 1.0–1.5mm is typically used; for M5, around 1.5–2.0mm; and for M6, around 2.0–2.5mm. Using the correct blade width helps prevent cam-out and protects the screw head slot from damage.

Are these screws suitable for aluminum, wood, or plastic?

Yes. A2 stainless slotted countersunk screws are commonly used with aluminum panels, hardwood and softwood, and rigid plastics. The flat countersunk head sits flush with the surface, making them ideal for applications where a smooth, snag-free finish is required. Pre-drilling and countersinking the hole to the correct 90° angle is recommended for best results.

How do I convert the screw length from mm to inches?

Divide the millimeter value by 25.4 to get inches. Quick reference: 6mm ≈ 1/4" | 8mm ≈ 5/16" | 10mm ≈ 3/8" | 12mm ≈ 1/2" | 16mm ≈ 5/8" | 20mm ≈ 13/16" | 25mm ≈ 1" | 30mm ≈ 1-3/16" | 40mm ≈ 1-9/16" | 50mm ≈ 2" | 60mm ≈ 2-3/8".

Should I use a washer with countersunk screws?

In most cases, countersunk screws are designed to be used without a washer under the head — the tapered head seats directly into the countersunk hole. However, a countersunk washer (also called a finishing washer) can be used when the material is soft or when a decorative finish is desired. On the nut side, a standard flat washer is generally recommended to distribute load.

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A2 Stainless Steel Slotted Countersunk Screws DIN 963 – M4 M5 M6, 6–60mm

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A2 Stainless Steel Slotted Countersunk Screws DIN 963 — Flush-Fit Fasteners for Clean, Corrosion-Resistant Assemblies

✅ Key Features of These A2 Stainless Slotted Countersunk Screws DIN 963

🎯 Who Is This For?

❓ Frequently Asked Questions

A2 Stainless Steel Slotted Countersunk Screws DIN 963 – M4 M5 M6, 6–60mm

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