What driver bit do I need for Pozi pan head screws?

These screws use a Pozidriv (PZ) drive, which looks similar to Phillips but has additional cross-hatching. For M2 screws, a PZ0 bit is typically used; for M3, a PZ1; and for M4, a PZ2. Using the correct Pozidriv bit — not a Phillips bit — prevents cam-out and protects the head.

Do the matching nuts come included with the screws?

The M2, M3, and M4 nuts are sold separately as their own size options in this listing. Select the nut size that matches your screw size. Machine screws (M2, M3, M4 lengths) do not include nuts by default — add the matching nut size to your order if needed.

Carbon Steel Pozi Pan Head Machine Screws M2 M3 M4 with Nuts – 3 to 60mm - HomeDIYer

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Carbon Steel Pozi Pan Head Machine Screws M2 M3 M4 with Nuts – 3 to 60mm

HomeDIYer

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By HomeDIYer®

Size:: M2 Nut

Quantity(PCS): 100PCS

Price:

$12.09 USD

Stock:

In stock (500 units), ready to be shipped

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Carbon Steel Pozi Pan Head Machine Screws M2 M3 M4 — One Listing for Screws, Nuts & Self-Tapping Fasteners

Sourcing the right metric fastener shouldn’t mean juggling a dozen separate orders. Whether you’re a maker assembling an electronics enclosure, a fabricator building a steel bracket, or a hobbyist putting together RC components, having the right Pozi pan head screw — in the right size, right quantity — on hand makes all the difference. This listing covers carbon steel Pozi pan head machine screws in M2, M3, and M4 thread diameters, plus matching hex nuts and self-tapping variants, all in one place.

Each order contains your chosen size and quantity of carbon steel Pozi (Pozidriv) pan head fasteners. Thread diameters available: M2 (2mm / ≈0.079"), M3 (3mm / ≈0.118"), and M4 (4mm / ≈0.157"). Screw lengths range from 3mm (≈1/8") up to 60mm (≈2-3/8") depending on the thread size selected. Matching hex nuts are available in M2, M3, and M4. Self-tapping variants are available in M3×20mm (≈25/32"), M4×30mm (≈1-3/16"), and M5×12mm (≈15/32"). Pack quantities range from 20 to 500 pieces.

Typical use cases include general mechanical assembly and electronics enclosure fastening where a Pozi pan head machine screw provides a low-profile, flush-seated head; sheet metal and thin-panel joining using the self-tapping M4 or M5 variants that cut their own threads without pre-tapping; and small-batch production or repair work where buying metric screws in bulk packs of 100–500 reduces per-unit cost and keeps the parts bin stocked.

🔩 Compatibility: ISO metric thread standard — M2 (0.4mm pitch), M3 (0.5mm pitch), M4 (0.7mm pitch). Drive: Pozidriv (PZ0 for M2, PZ1 for M3, PZ2 for M4). Nuts: standard ISO hex nuts. Self-tapping variants do not require pre-tapped holes.

✅ Key Features of These Carbon Steel Pozi Pan Head Machine Screws

🔧Pozidriv (PZ) Drive — The Pozi drive recess provides more contact points than a standard Phillips, reducing cam-out during installation and allowing higher torque transfer — especially useful when driving M4 pan head screws into tight assemblies.
⚖️Pan Head Profile — The rounded, low-profile pan head sits above the surface and distributes clamping load over a wider area, making it a reliable choice for carbon steel machine screws used in sheet metal, enclosures, and panel assemblies.
🛡️Carbon Steel Construction — Carbon steel offers solid tensile strength for general mechanical fastening, outperforming many non-ferrous alternatives in load-bearing applications where corrosion resistance is not the primary concern.
📦Three Thread Sizes in One Listing — M2, M3, and M4 thread diameters are all available here, along with matching hex nuts and self-tapping variants, so you can consolidate your metric fastener sourcing without placing multiple orders.
📐Wide Length Range — Screw lengths from 3mm (≈1/8") to 60mm (≈2-3/8") cover a broad range of panel thicknesses and stack-up depths, from thin PCB standoff work to deeper structural assemblies.
📆Flexible Pack Quantities — Choose from 20 to 500 pieces per order to match your project scale — whether you need a small bag of M2 screws for a prototype or a bulk pack of M4 pan head bolts for a production run.

📐 Technical Specifications — Carbon Steel Pozi Pan Head Machine Screws

Thread Standard	ISO Metric (coarse thread)
Available Thread Diameters	M2 (2mm / ≈0.079"), M3 (3mm / ≈0.118"), M4 (4mm / ≈0.157")
Thread Pitch	M2: 0.4mm \| M3: 0.5mm \| M4: 0.7mm
Available Screw Lengths	M2: 3–30mm (≈1/8"–1-3/16") \| M3: 5–35mm (≈3/16"–1-3/8") \| M4: 5–60mm (≈3/16"–2-3/8")
Head Type	Pan Head (rounded, low-profile)
Drive Type	Pozidriv (PZ) — PZ0 (M2), PZ1 (M3), PZ2 (M4)
Material	Carbon Steel
Finish / Coating	See variant options — contact us to confirm
Nuts Available	M2, M3, M4 hex nuts (sold as separate size options in this listing)
Self-Tapping Variants	M3×20mm (≈25/32"), M4×30mm (≈1-3/16"), M5×12mm (≈15/32")
Pack Quantity Options	20, 40, 50, 60, 80, 100, 150, 200, 250, 300, 400, 500 pcs
Corrosion Resistance	Limited — recommended for dry/indoor use; contact us for coated options

⚠️ Note: Carbon steel is susceptible to rust in wet or outdoor environments. For damp or exterior applications, consider a zinc-plated or stainless steel alternative. Self-tapping variants cut their own threads — no pre-tapping required, but pilot hole sizing should match the screw’s minor diameter.

❓ Frequently Asked Questions

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

A general rule is to select a length that allows the screw to penetrate the base material by at least 2–3 times the thread diameter. For M3 screws, that typically means at least 6–9mm of thread engagement in the base. For example, if you’re fastening two 5mm panels together, an M3×16mm (≈19/32") screw generally provides solid grip. Always account for any washers, spacers, or nuts in your total stack height.

How strong are these carbon steel screws compared to stainless steel?

Carbon steel machine screws are generally stronger in tensile and shear strength than standard 304 stainless steel fasteners of the same size, making them a solid choice for mechanical assemblies where load-bearing matters more than corrosion resistance. For critical structural applications, always verify the specific grade and consult engineering load tables. For outdoor or wet environments, stainless steel is generally the better choice.

Are these screws suitable for outdoor or wet environments?

Carbon steel is susceptible to rust when exposed to moisture without a protective coating. These screws are generally recommended for indoor or dry environments. For outdoor, marine, or high-humidity applications, a zinc-plated, hot-dip galvanized, or stainless steel fastener is typically a better fit. If you need to use carbon steel outdoors, applying a rust-inhibiting coating after installation can help extend service life.

What thread standard do these M2, M3, and M4 screws follow, and are they compatible with standard nuts?

These screws follow the ISO metric coarse thread standard: M2 × 0.4mm pitch, M3 × 0.5mm pitch, and M4 × 0.7mm pitch. They are compatible with standard ISO metric hex nuts, threaded inserts, and tapped holes of the corresponding size. They are not compatible with UNC/UNF inch-standard threads. The matching M2, M3, and M4 hex nuts are available as separate size options in this same listing.

What driver bit do I need, and why use Pozidriv instead of Phillips?

These screws use a Pozidriv (PZ) drive. For M2, a PZ0 bit is typically correct; for M3, use PZ1; for M4, use PZ2. Pozidriv has additional radial ribs between the cross slots that provide more contact area and significantly reduce cam-out compared to a standard Phillips drive. Using a Phillips bit in a Pozi head will work in a pinch but can damage the recess over time — always use the correct PZ bit for best results.

What is the difference between the machine screws and the self-tapping variants?

Machine screws require a pre-tapped hole or a nut to fasten — they cannot cut their own threads. The self-tapping variants (M3×20mm, M4×30mm, M5×12mm) have a thread-forming tip that cuts into softer materials like plastic, thin sheet metal, or wood as the screw is driven in, eliminating the need for a pre-tapped hole or nut. For self-tapping screws, drilling a pilot hole slightly smaller than the screw’s major diameter is generally recommended for clean thread formation.

Do the matching nuts come included, and how do I order them?

The M2, M3, and M4 hex nuts are available as separate size options within this same listing — simply select “M2 Nut,” “M3 Nut,” or “M4 Nut” from the size dropdown and choose your quantity. Machine screws do not include nuts by default. If your project requires both screws and nuts, add each as a separate line item to your cart.

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