What thread standard do these screws use?

These screws follow the ISO metric thread standard (M1.2, M1.4, M1.6, M1.7, M2, M2.5, M3, M3.5, M4). They are generally compatible with standard metric nuts, inserts, and tapped holes of the corresponding pitch.

Can these screws be used outdoors?

The nickel plating provides a degree of corrosion resistance, but these screws are generally intended for indoor or protected environments. For prolonged outdoor or high-humidity exposure, stainless steel fasteners are typically recommended.

What screwdriver bit do I need?

These screws use a Phillips (cross) drive head. For M1.2–M1.7 sizes, a PH000 or PH00 bit is typically required. For M2–M3, a PH0 bit is generally appropriate. For M3.5–M4, a PH1 bit is commonly used. Always use a properly sized bit to avoid cam-out.

M1.2–M4 Countersunk Phillips Machine Screws | Nickel Plated Steel | Flat Head Bolts - HomeDIYer

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M1.2–M4 Countersunk Phillips Machine Screws | Nickel Plated Steel | Flat Head Bolts

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Thread Diameter: M1.2 - 1.2mm

Screw Length (Including head): 3mm

Pack Quantity: 1

Price:

$2.69 USD

Stock:

In stock (500 units), ready to be shipped

Quantity:

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M1.2–M4 Countersunk Phillips Machine Screws — Flush-Fit Fastening for Precision Work

When a protruding screw head is not an option — whether you're assembling a PCB enclosure, securing a thin aluminum panel, or building a precision hobby project — finding the right countersunk Phillips machine screw in the exact size you need can be frustrating. Makers, electronics hobbyists, and small-batch manufacturers all share the same pain: hardware stores rarely stock sub-M3 metric sizes, and ordering in bulk means paying for screws you don't need.

These M1.2–M4 countersunk flat head machine screws are made from steel with a nickel plated finish, available in thread diameters from M1.2 (1.2mm) through M4 (4mm) and lengths from 2mm (≈5/64") to 12mm (≈15/32"), measured including the head. Pack quantities of 1, 10, 25, 50, and 100 pieces let you order exactly what your project requires — no waste, no shortage.

Typical use cases include securing electronics enclosures and PCB mounting hardware, assembling RC car chassis and drone frames where flush-head fasteners reduce aerodynamic drag, and fine-detail woodworking or furniture joinery where a smooth surface finish is required. The ISO metric thread profile makes these countersunk Phillips screws compatible with standard metric tapped holes and threaded inserts across a wide range of materials.

ℹ️ Compatibility: ISO metric thread standard — fits standard metric nuts, threaded inserts, and tapped holes in the corresponding M size. Thread pitch follows standard ISO coarse pitch for each diameter. Confirm your hole specification before ordering.

✅ Key Features of These Countersunk Phillips Machine Screws

🔩Flat Countersunk Head — 90° countersunk profile sits flush with or below the surface when installed in a properly countersunk hole, eliminating snag points on panels and enclosures.
⚙️Wide Size Range (M1.2–M4) — Covers micro to small machine screw sizes in a single listing, making it easy to source hard-to-find sub-M3 metric countersunk screws for electronics and precision assemblies.
✨Nickel Plated Steel — The nickel plating provides a bright, uniform finish and a degree of corrosion resistance for indoor and protected-environment applications.
🔧Phillips (Cross) Drive — Compatible with standard Phillips screwdrivers and power tool bits (PH000–PH1 depending on size), making installation straightforward without specialized tooling.
📦Flexible Pack Quantities — Choose 1, 10, 25, 50, or 100 pieces per order so you can prototype with a single screw or stock up for production runs without overpaying for excess inventory.
📐ISO Metric Thread Profile — Standard metric coarse thread pitch for each diameter ensures compatibility with off-the-shelf metric nuts, threaded inserts, and tapped holes used in electronics, robotics, and hobby fabrication.

📐 Technical Specifications — Countersunk Phillips Machine Screws

Head Style	Countersunk Flat Head (90° included angle)
Drive Type	Phillips (Cross)
Material	Steel
Finish	Nickel Plated
Thread Standard	ISO Metric Coarse
Thread Diameter Options	M1.2, M1.4, M1.6, M1.7, M2, M2.5, M3, M3.5, M4
Length Options (incl. head)	2mm (≈5/64"), 3mm (≈1/8"), 4mm (≈5/32"), 5mm (≈13/64"), 6mm (≈15/64"), 8mm (≈5/16"), 10mm (≈25/64"), 12mm (≈15/32")
Pack Quantity Options	1, 10, 25, 50, 100 pieces
Recommended Drive Bit	PH000–PH00 (M1.2–M1.7) / PH0 (M2–M3) / PH1 (M3.5–M4) — See variant options
Tensile Strength	See variant options / Contact us to confirm
Outdoor / Corrosion Rating	Indoor / protected environments recommended
Country of Origin	Contact us to confirm

⚠️ Note: Length measurement includes the head. If your application requires shank-only length, subtract the head height from the total. Head height varies by diameter — contact us to confirm if critical.

❓ Frequently Asked Questions

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

As a general rule, the screw length (including head) should be at least 1.5× the thickness of the material being fastened. For example, a 3mm (≈1/8") screw works well for thin sheet metal or PCB standoffs, while 8mm (≈5/16") suits thicker panels or stacked assemblies. Always measure your total stack thickness — including any washers or inserts — before selecting a length. When in doubt, size up slightly rather than risk a screw that bottoms out before clamping.

What thread standard do these screws follow, and will they fit my nuts or inserts?

These screws follow the ISO metric coarse thread standard, which is the most widely used metric fastener standard globally. They are generally compatible with standard metric nuts, heat-set threaded inserts, and tapped holes of the corresponding M size and coarse pitch. If your application uses a fine-pitch thread or a non-standard insert, contact us to confirm compatibility before ordering.

How strong are these machine screws — what loads can they handle?

These are steel machine screws with nickel plating. Steel construction typically provides solid tensile and shear strength for light-to-medium duty fastening applications such as electronics enclosures, hobby assemblies, RC vehicles, and precision instruments. The exact load rating depends on the specific diameter and length. For safety-critical or heavy structural applications, contact us to confirm the mechanical grade before use.

Can I use these screws outdoors or in humid environments?

The nickel plating provides a degree of corrosion resistance and is generally suitable for indoor or protected environments. For prolonged outdoor exposure, high-humidity conditions, or marine environments, stainless steel fasteners are typically recommended. If you need outdoor-rated countersunk machine screws, contact us and we can advise on alternatives.

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

These screws use a Phillips (cross) drive. The correct bit size depends on the thread diameter:

M1.2–M1.7: typically PH000 or PH00
M2–M3: typically PH0
M3.5–M4: typically PH1

Always use a properly sized, well-fitting bit to avoid cam-out and head damage, especially on smaller sizes. A manual screwdriver with good tip engagement is recommended for M1.2–M1.7.

What does 'countersunk flat head' mean, and do I need a special hole?

A countersunk flat head screw is designed to sit flush with or below the surface of the material when installed in a countersunk (beveled) hole. The 90° head angle matches a standard countersink drill bit. Without a countersunk hole, the head will protrude above the surface. For flush installation, drill a clearance hole first, then use a countersink bit at the correct angle before driving the screw.

How many screws come in each pack, and can I mix sizes in one order?

Each variant is sold in packs of 1, 10, 25, 50, or 100 pieces of the same size. To order multiple sizes, simply add each size/quantity combination to your cart separately. There is no minimum order quantity — you can order as few as 1 screw to test fit before committing to a larger pack.

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