Which driver bit should I use with these screws?

These screws use a Phillips (cross) drive. For M1.7–M2 sizes, a PH0 bit is typically correct. For M2.2–M3 sizes, a PH1 bit is generally recommended. For M3.5–M4 sizes, a PH2 bit is typically appropriate.

Can I use these screws with standard metric nuts?

Yes. These are standard ISO metric machine screws and are compatible with metric hex nuts, nylon lock nuts, and other metric fasteners of the matching thread size. Always verify the thread pitch matches — these are generally standard coarse pitch.

M1.7–M4 Stainless Steel Phillips Pan Head Machine Screws — 304 A2, Multiple Sizes

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M1.7–M4 Stainless Steel Phillips Pan Head Machine Screws — 304 A2, Multiple Sizes

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Nuts Sizes: M1.7 x 3 x 5.0mm

Nuts Material: 304 Stainless Steel

Quantity (Pcs): 10

Price:

$2.92 USD

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In stock (500 units), ready to be shipped

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M1.7–M4 Phillips Pan Head Machine Screws — Stainless Steel for Precision Fastening

Finding the right small-diameter machine screw shouldn't mean digging through a dozen hardware bins or ordering from three different suppliers. Whether you're a hobbyist assembling electronics enclosures, a maker building RC components, or a technician maintaining precision equipment, having the correct metric Phillips pan head machine screws on hand makes the difference between a clean build and a frustrating one.

Each listing covers 304 stainless steel (A2 grade) Phillips cross pan head machine screws in thread diameters from M1.7 to M4, with lengths ranging from 3mm (≈1/8") to 20mm (≈25/32"). Head outer diameters range from 5.0mm to 10mm depending on the thread size. Available in packs of 10, 20, or 50 pieces — choose the quantity that fits your project or stock needs.

These screws are well-suited for electronics enclosure assembly, small appliance repair, RC car and drone frame construction, and light-duty mechanical assemblies where a low-profile pan head and corrosion-resistant material are required. The Phillips drive makes them compatible with standard power drivers and hand screwdrivers in most workshops.

ℹ️ Compatibility Note: These are ISO metric machine screws (M-series). They require metric-tapped holes or metric nuts. Not compatible with UNC/UNF inch-standard threads. Size format: Thread Diameter × Length × Head OD (e.g., M3 × 6 × 7.0mm).

✅ Key Features of These Phillips Pan Head Machine Screws

🔩 304 Stainless Steel (A2 Grade) — Offers solid corrosion resistance for indoor, light outdoor, and electronics applications without the weight penalty of larger fasteners.
📐 Wide Size Range: M1.7 to M4 — Covers the most common small-diameter metric machine screw sizes used in electronics, hobby builds, and light mechanical assemblies, reducing the need for multiple suppliers.
➕ Phillips Cross Drive — Compatible with standard PH0, PH1, and PH2 driver bits. Works with both manual screwdrivers and power drivers for faster assembly in production or repair workflows.
🔘 Pan Head Profile — The rounded, low-profile pan head distributes clamping load across a wider surface area compared to flat or countersunk heads, making it a reliable choice for thin panels and plastic enclosures.
📦 Flexible Pack Quantities (10 / 20 / 50 pcs) — Order just enough for a single repair job or stock up for ongoing projects. Consistent sizing across packs makes inventory management straightforward.
🔬 Precise Metric Dimensions — Each variant lists thread diameter, screw length, and head outer diameter so you can confirm fit before ordering — no guesswork on head clearance or thread engagement depth.

📐 Technical Specifications — Phillips Pan Head Machine Screws

Material	304 Stainless Steel (A2 Grade)
Drive Type	Phillips (Cross / PH)
Head Style	Pan Head
Thread Standard	ISO Metric (M-series, coarse pitch)
Thread Diameter Range	M1.7, M2, M2.2, M2.6, M3, M3.5, M4
Length Range	3mm (≈1/8") – 20mm (≈25/32")
Head OD Range	5.0mm – 10mm (varies by thread size; see variant options)
Thread Pitch	See variant options (standard ISO coarse pitch per diameter)
Surface Finish	Natural stainless (no coating)
Recommended Driver Bit	PH0 (M1.7–M2), PH1 (M2.2–M3), PH2 (M3.5–M4) — typically
Pack Quantities	10 pcs / 20 pcs / 50 pcs
Country of Origin	Contact us to confirm

⚠️ Heads up: The size format used in variant names is Thread Diameter × Length × Head OD (e.g., M3 × 6 × 7.0mm). Please verify all three dimensions against your application before ordering, especially head clearance in countersunk or recessed holes.

❓ Frequently Asked Questions

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

A general rule is that the screw should engage at least 1.5× the screw diameter in the receiving material. For example, an M3 screw typically needs at least 4.5mm of thread engagement. If you are fastening two panels together, add the thickness of the top panel to the required thread engagement to get your minimum length. When in doubt, size up. For reference: 6mm ≈ 1/4", 10mm ≈ 3/8", 16mm ≈ 5/8", 20mm ≈ 25/32".

What load can these pan head machine screws handle?

304 stainless steel (A2 grade) generally has a tensile strength of approximately 500–700 MPa. Actual load capacity depends on the screw diameter, thread engagement depth, and the material being fastened. For critical structural applications, consult an engineer or refer to ISO 3506 specifications for A2-70 stainless fasteners. These screws are generally suited for light-to-medium duty mechanical and electronic assemblies.

Are these screws suitable for outdoor or marine use?

304 stainless steel offers good corrosion resistance in most outdoor environments and is typically suitable for general exterior use. However, in highly corrosive environments — such as coastal or marine settings with direct saltwater exposure — 316 stainless steel is generally recommended for longer service life. For light outdoor DIY projects, electronics enclosures, and non-marine exterior applications, 304 A2 is typically sufficient.

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

These are ISO metric machine screws (M-series) and are compatible with standard metric hex nuts, nylon lock nuts, and metric threaded inserts of the matching diameter. They are not compatible with UNC or UNF inch-standard threads. Always confirm the thread pitch matches your nut or tapped hole — these are generally standard ISO coarse pitch (e.g., M3 × 0.5mm, M4 × 0.7mm).

What does the size format 'M3 x 6 x 7.0mm' mean?

The three numbers represent: (1) Thread diameter — M3 means 3mm nominal thread diameter. (2) Screw length — 6mm measured from under the head to the tip of the screw. (3) Head outer diameter — 7.0mm is the diameter of the pan head. Knowing the head OD helps you confirm the head will fit within your clearance hole or recess without interference.

Which Phillips driver bit size should I use?

Driver bit sizing is typically matched to screw diameter: PH0 is generally correct for M1.7–M2 screws; PH1 for M2.2–M3; and PH2 for M3.5–M4. Using the correct bit size is important — an oversized bit can damage the head recess, especially on smaller screws. Apply steady downward pressure when driving to reduce cam-out risk.

Can I use these screws in plastic enclosures or PCB standoffs?

Yes, pan head machine screws are commonly used in plastic enclosures, PCB mounting, and electronics assemblies. The pan head's wider bearing surface distributes clamping force, which helps reduce the risk of cracking thin plastic panels. For plastic, in most cases you will want a pre-tapped hole or a brass/steel insert — machine screws are not self-tapping. Confirm hole diameter matches the thread size before assembly.

How do I decide between ordering 10, 20, or 50 pieces?

The 10-piece pack is generally suited for single-project repairs or prototyping. The 20-piece pack works well for small production runs or builds with multiple assemblies. The 50-piece pack offers a lower per-unit cost and is a good choice if you regularly use a specific size or want to maintain workshop stock. All packs contain identical screws — only the quantity differs.

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