Solid Brass Flat Countersunk Phillips Machine Screws — M4, 6mm–40mm $1.89 USD

Solid Brass Flat Countersunk Phillips Machine Screws — M4, 6mm–40mm

Name: Solid Brass Flat Countersunk Phillips Machine Screws — M4, 6mm–40mm
Brand: HomeDIYer
SKU: A3830-0
Price: 1.89 USD
Availability: InStock

$1.89 USD

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Solid Brass Flat Countersunk Phillips Machine Screws — Flush Fit and Lasting Corrosion Resistance in One M4 Fastener

Whether you’re assembling fine furniture, fitting decorative cabinet hardware, building a wooden jewelry box, or finishing a bathroom fixture, a protruding screw head is never the look you want. These solid brass flat countersunk Phillips machine screws deliver a clean, flush finish with the warm, distinctive appearance that only real brass provides — making them the go-to M4 fastener for woodworkers, makers, and hardware enthusiasts who care about the details.

Each screw is machined from solid brass (not plated) and features a flat countersunk head with a Phillips (cross) drive. Available in M4 diameter across ten lengths: 6mm (15/64”), 8mm (5/16”), 10mm (3/8”), 12mm (15/32”), 16mm (5/8”), 20mm (25/32”), 25mm (1”), 30mm (1-3/16”), 35mm (1-3/8”), and 40mm (1-9/16”). Choose from pack sizes of 5, 10, 20, 40, 60, 100, or 200 pieces to match your project scale.

These brass countersunk machine screws are a natural fit for cabinet and furniture assembly where a flush, decorative fastener is required; for marine and bathroom fittings where corrosion resistance matters in humid environments; and for instrument cases, wooden enclosures, and DIY home improvement projects where a non-magnetic, rust-resistant M4 fastener is the right call.

🔩 Compatibility: Metric thread (ISO standard) — fits standard M4 metric nuts, threaded inserts, and tapped holes. Use a matching 90° countersink bit for a flush-fit installation.

✅ Key Features of These Solid Brass Countersunk Phillips Machine Screws

🟡Solid Brass Construction — Machined from solid brass, not plated steel, delivering genuine corrosion resistance and a consistent warm-gold appearance that holds up over time in humid or decorative applications.
⬇️Flat Countersunk Head — Sits completely flush with the surface when installed in a properly countersunk hole, eliminating snag points and creating a clean, finished look on wood, plastic, and soft metal.
➕Phillips Drive for Easy Installation — Compatible with any standard PH2 Phillips screwdriver or power drill bit, making installation fast and straightforward without specialty tools.
📏10 Length Options in One Listing — From 6mm (15/64”) to 40mm (1-9/16”), this single M4 listing covers the full range of light-to-medium duty fastening depths, so you can find the right length without hunting across multiple products.
🚫🧲Non-Magnetic Material — Brass is inherently non-magnetic, making these screws a reliable choice for instrument hardware, electronics enclosures, and applications near sensitive components where steel fasteners would cause interference.
📦Flexible Pack Quantities — Order exactly what you need: 5-piece packs for small repairs, or 200-piece packs for larger builds and workshop stock — all at a consistent per-unit value.

📐 Technical Specifications — M4 Brass Flat Countersunk Machine Screws

Material	Solid Brass
Finish	Natural brass (uncoated)
Head Style	Flat Countersunk
Drive Type	Phillips (Cross / PH2)
Thread Standard	Metric (ISO), M4
Thread Diameter	M4 (4mm / 5/32” nominal)
Available Lengths	6mm (15/64”), 8mm (5/16”), 10mm (3/8”), 12mm (15/32”), 16mm (5/8”), 20mm (25/32”), 25mm (1”), 30mm (1-3/16”), 35mm (1-3/8”), 40mm (1-9/16”)
Pack Quantities	5, 10, 20, 40, 60, 100, 200 pieces
Countersink Angle	Typically 90° — confirm with countersink bit spec
Magnetic	No (brass is non-magnetic)
Recommended Applications	Cabinetry, furniture, bathroom fittings, instrument hardware, wooden enclosures, DIY home improvement
Country of Warehouse	United States

❓ Frequently Asked Questions

How do I choose the right screw length for my project?

A reliable rule of thumb is to select a length where at least two-thirds of the screw engages the base material. For example, if your top panel is 8mm thick, a 20mm (25/32”) screw generally provides solid holding power. The countersunk head sits flush with — not above — the surface, so the full listed length contributes to grip depth. When in doubt, size up rather than down.

Are solid brass M4 screws strong enough for my application?

Solid brass M4 machine screws are generally well-suited for light-to-medium duty fastening in wood, MDF, plastic, and soft metals. They are commonly used in furniture, cabinetry, instrument hardware, and decorative fittings. Brass is softer than steel, so these screws are not recommended for high-load structural connections or applications subject to heavy vibration — in those cases, stainless steel or hardened steel fasteners are typically the better choice.

Can I use these screws outdoors or in humid environments?

Yes — brass is naturally corrosion-resistant and performs well in humid indoor environments and light outdoor use, such as garden furniture, bathroom fittings, and covered exterior trim. For prolonged exposure to saltwater, coastal air, or standing water, a marine-grade stainless steel fastener is generally more appropriate for long-term durability.

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

These are standard ISO metric machine screws. M4 refers to a 4mm nominal thread diameter. They are compatible with any standard metric M4 nut, threaded insert, or tapped hole manufactured to the ISO 68-1 thread profile. They are not compatible with UNC/UNF (imperial) threads.

Will the head sit completely flush with the surface?

Yes, provided you use a countersink bit to prepare the hole before driving the screw. The flat countersunk head is designed to sit flush when the countersink angle matches the screw head angle — typically 90°. Using a countersink bit of the correct angle and diameter for M4 will give you a perfectly flush, snag-free finish. Driving the screw without countersinking first will leave the head proud of the surface.

How many screws come in each pack, and which quantity should I order?

Each listing is available in seven pack sizes: 5, 10, 20, 40, 60, 100, or 200 pieces. For a small repair or prototype, the 5- or 10-piece pack is usually sufficient. For furniture builds, cabinetry runs, or workshop stock, the 60- to 200-piece packs offer better value per screw. Select your preferred quantity from the Pack Quantity option above.

What screwdriver or bit do I need to drive these screws?

These M4 screws use a standard Phillips (cross) drive. A PH2 bit is typically the correct fit for M4 screws. Always match the bit size carefully — using an undersized bit can cause cam-out and damage the drive recess, especially in softer brass. For best results, use a hand screwdriver or set your drill to a low torque setting to avoid over-driving.

🛒 Select your length and pack quantity above, then add to cart — ships from our US warehouse.