What Phillips bit size do M5 countersunk machine screws use?

M5 countersunk machine screws typically use a Phillips #2 (PH2) bit. This is the most common Phillips size and fits the vast majority of M5 flat head screws. Using the correct bit size reduces cam-out and protects the drive recess.

Are zinc plated screws suitable for outdoor use?

Zinc plating provides moderate corrosion resistance suitable for indoor use and dry or sheltered outdoor environments. For prolonged outdoor exposure, high humidity, or direct contact with moisture, stainless steel or hot-dip galvanized fasteners are generally recommended. These screws are well-suited for indoor furniture assembly, electronics enclosures, cabinetry, and sheltered structural applications.

M5 Countersunk Head Phillips Machine Screws | Zinc Plated | Flat Head | 8–20mm - HomeDIYer

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M5 Countersunk Head Phillips Machine Screws | Zinc Plated | Flat Head | 8–20mm

HomeDIYer

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By HomeDIYer®

Screw Size: M5*8

QTY(Pcs): 5

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$5.75 USD

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In stock (500 units), ready to be shipped

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M5 Countersunk Head Phillips Machine Screws — Zinc Plated Flat Head Fasteners for Flush-Mount Applications

A protruding screw head in the wrong place can jam a sliding panel, snag a cable, or ruin a clean finish. Engineers, furniture makers, electronics assemblers, and DIYers who need a truly flush surface rely on M5 countersunk Phillips machine screws to keep fasteners out of the way. The 90° countersunk head seats completely below the surface in a properly drilled countersink, leaving a flat, unobstructed face.

Each set contains M5 flat head Phillips machine screws manufactured from steel with a zinc plating finish for corrosion resistance in dry and sheltered environments. Thread standard is ISO metric coarse M5×0.8 (5mm diameter, 0.8mm pitch). Available in five lengths — 8mm (≈5/16"), 10mm (≈3/8"), 12mm (≈1/2"), 16mm (≈5/8"), and 20mm (≈3/4") — with pack quantities from 5 to 500 pieces, so you can order exactly what your project demands.

Typical applications include flush panel mounting on electronics enclosures and control boxes where M5 flat head machine screws for metal panels keep surfaces snag-free, furniture and cabinetry assembly where countersunk screws for wood and MDF create a clean finished look, and light structural fastening in sheltered environments such as brackets, fixtures, and equipment frames where zinc plated machine bolts provide reliable hold without surface rust.

🔩 Thread Compatibility: ISO Metric Coarse — M5×0.8 (5mm diameter, 0.8mm pitch). Compatible with standard M5 metric nuts, threaded inserts, hex standoffs, and tapped holes per ISO 68-1. Drive: Phillips #2 (PH2) bit.

✅ Key Features of These M5 Countersunk Phillips Machine Screws

⬇️90° Countersunk Head for True Flush Mounting — The flat-top, angled underside seats fully into a standard 90° countersink, leaving the surface completely flush — essential for sliding panels, mating assemblies, and clean-finish furniture work.
🔧Phillips #2 Drive — Universal Compatibility — The Phillips cross recess accepts the most widely available PH2 bits and screwdrivers, making these M5 flat head machine screws easy to install with tools already in any workshop or job site kit.
🛡️Zinc Plated Finish for Corrosion Resistance — The electroplated zinc coating protects the steel core from oxidation in dry and sheltered indoor environments, extending service life in electronics enclosures, cabinetry, and interior fixtures.
📏Five Length Options — 8mm to 20mm — From 8mm (≈5/16") for thin panel fastening to 20mm (≈3/4") for thicker substrates, the full length range covers the most common M5 countersunk screw applications without needing multiple product lines.
📦Bulk-Friendly Pack Sizes — 5 to 500 Pieces — Whether you need a 5-pack for a quick repair or a 500-pack for a production run, flexible quantities let you match your order to your actual usage — no overstocking, no running short mid-project.
⚙️ISO M5×0.8 Metric Coarse Thread — Fully compatible with standard M5 nuts, threaded inserts, and tapped holes, ensuring reliable thread engagement and interchangeability with other metric hardware in your assembly.

📐 Technical Specifications — M5 Countersunk Phillips Machine Screws

Material	Steel (zinc plated)
Finish	Electroplated zinc (bright)
Head Style	Countersunk / Flat Head (90° included angle)
Drive Type	Phillips (PH2 — #2 bit)
Thread Standard	ISO Metric Coarse — M5×0.8
Thread Diameter	M5 (5mm / ≈3/16")
Available Lengths (total incl. head)	8mm (≈5/16") / 10mm (≈3/8") / 12mm (≈1/2") / 16mm (≈5/8") / 20mm (≈3/4")
Pack Quantities	5 / 10 / 20 / 30 / 50 / 80 / 100 / 200 / 300 / 500 pcs
Property Class	Typically 4.8 or 8.8 per ISO 898-1 — Contact us to confirm
Corrosion Resistance	Moderate — suitable for dry/sheltered indoor use
Countersink Angle	90°
Country of Origin	See variant options

❓ Frequently Asked Questions

How do I choose the right length for M5 countersunk screws?

For countersunk screws, the listed length is the total length including the head (unlike socket cap screws where length excludes the head). A general rule: the screw should engage at least 1.5× the diameter in threaded material — for M5, that means at least 7.5mm of thread engagement. Quick inch reference: 8mm ≈ 5/16", 10mm ≈ 3/8", 12mm ≈ 1/2", 16mm ≈ 5/8", 20mm ≈ 3/4". Measure your panel thickness and add the required thread engagement to select the correct length.

What Phillips bit size do these M5 flat head screws require?

M5 countersunk machine screws typically use a Phillips #2 (PH2) bit — the most common Phillips size. Using the correct bit size reduces cam-out and protects the drive recess, especially when driving at higher torque. Avoid using worn or undersized bits, which can strip the recess.

Are zinc plated screws suitable for outdoor or humid environments?

Zinc plating provides moderate corrosion resistance suitable for indoor use and dry or sheltered outdoor environments. For prolonged outdoor exposure, high humidity, or direct contact with moisture, stainless steel (A2 or A4) or hot-dip galvanized fasteners are generally recommended. These screws are well-suited for indoor furniture, electronics enclosures, cabinetry, and sheltered structural applications.

What thread standard do these M5 screws follow, and are they compatible with standard M5 nuts?

These screws use the ISO metric coarse thread standard: M5×0.8 (5mm nominal diameter, 0.8mm thread pitch). They are compatible with standard M5 metric nuts, hex standoffs, threaded inserts, and tapped holes following ISO 68-1 — the same standard used by most metric hardware worldwide.

Why use a countersunk flat head screw instead of a pan head or button head?

Countersunk screws are designed to sit flush with or below the surface when installed in a properly drilled countersink hole. This makes them ideal for applications where a protruding head would interfere with mating parts, create a snag hazard, or affect appearance — such as panel mounting, furniture assembly, electronics enclosures, and decorative woodwork. Pan head and button head screws sit above the surface and are used where countersinking is not practical or desired.

What is the tensile strength and load rating of these zinc plated machine screws?

Zinc plated steel machine screws are typically manufactured to property class 4.8 or 8.8 per ISO 898-1. Class 4.8 screws have a minimum tensile strength of approximately 420 MPa; class 8.8 screws are rated to approximately 800 MPa. Contact us to confirm the property class for your specific order if load-bearing performance is critical to your application.

Which pack size should I order for my project?

Pack sizes range from 5 to 500 pieces. For a single repair or prototype, a 5- or 10-pack is sufficient. For small production runs or furniture assembly, 50–100 pcs is a practical quantity. For high-volume manufacturing, assembly lines, or stocking a workshop, the 200- or 500-pack offers the best per-unit value. All packs ship from our US warehouse.

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