M2.5 / M2.6 / M3 Pan Head Phillips Machine Screws with Integrated Washer — No Loose Washers, Faster Assembly
Dropping tiny washers during electronics assembly or losing them inside an enclosure mid-build is a frustration that slows down every technician, hobbyist, and production assembler who works with small metric fasteners. These M2.5, M2.6, and M3 pan head Phillips machine screws with integrated washer solve that problem by permanently pre-assembling the washer under the head — so the washer is always in place, correctly positioned, and ready to install. Available in five material and finish combinations with bulk packs up to 300 pieces.
Each pack contains pan head Phillips machine screws with a free-spinning integrated washer (SEMS-style construction) in your selected material, finish, thread size, length, and quantity. Thread sizes available: M2.5, M2.6, and M3. Lengths range from 5mm (≈3/16") to 48mm (≈1-7/8"). The washer outer diameter (OD) varies by variant and is specified in parentheses in the variant name — for example, “M3 x 6mm (Washer 9mm)” means a 9mm OD washer. Materials include Carbon Steel with Bright Nickel, White Zinc, Black Zinc, or Colored Zinc plating, plus plain Stainless Steel. Packs are available in 100, 200, or 300 pieces.
Typical use cases include electronics enclosure and PCB assembly where pan head Phillips screws with integrated washers speed up production by eliminating the separate washer-handling step; camera, optical equipment, and Japanese-manufactured device repair where M2.6 screws are the standard thread size; and sheet metal and thin-panel fastening where the larger washer OD distributes clamping load and prevents pull-through in softer base materials.
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Compatibility: ISO metric threads — M2.5 (0.45mm pitch), M2.6 (0.45mm pitch), M3 (0.5mm pitch). Each size is not interchangeable with the others. The washer OD is specified per variant — verify the washer diameter fits your application before ordering.
✅ Key Features of These M2.5 M3 Pan Head Phillips Screws with Integrated Washer
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🔧Pre-Assembled Integrated Washer — The free-spinning washer is permanently captured under the pan head before threading (SEMS construction), eliminating loose washers during assembly and ensuring the washer is always correctly positioned without extra handling steps.
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🎨5 Material & Finish Options — Choose from Carbon Steel with Bright Nickel, White Zinc, Black Zinc, or Colored Zinc plating, or plain Stainless Steel — matching the finish to your corrosion requirements, aesthetic needs, or existing hardware.
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📐Washer OD Specified Per Variant — Each variant clearly states the integrated washer outer diameter (e.g., 5mm, 6mm, 7.5mm, 9mm, 10mm), allowing precise selection based on your clearance hole size and load distribution requirements in thin or soft materials.
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🔬Includes Uncommon M2.6 Size — M2.6 is the standard thread used in many Japanese cameras, optical instruments, and consumer electronics. Having M2.6 pan head screws with washer in stock is essential for repair technicians who service these devices regularly.
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📦Bulk Packs Up to 300 Pieces — Available in 100, 200, or 300-piece packs, making these integrated washer machine screws practical for production assembly lines, workshop stock, and repair kits without the cost of small retail packaging.
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🔩Pan Head Profile for Flush-Free Fastening — The rounded pan head sits above the surface and provides a larger bearing area than a flat head, making it suitable for through-hole fastening in panels, enclosures, and brackets where countersinking is not required or desired.
📐 Technical Specifications — Pan Head Phillips Machine Screws with Integrated Washer
| Thread Sizes |
M2.5, M2.6, M3 (ISO metric) — see variant options |
| Thread Pitch |
M2.5: 0.45mm | M2.6: 0.45mm | M3: 0.5mm (coarse) |
| Available Lengths |
5mm (≈3/16"), 6mm (≈1/4"), 7mm (≈9/32"), 8mm (≈5/16"), 9mm (≈3/8"), 10mm (≈3/8"), 12mm (≈1/2"), 14mm (≈9/16"), 48mm (≈1-7/8") — see variant options |
| Head Style |
Pan Head with Integrated Washer (SEMS-style) |
| Drive Type |
Phillips — typically PH1 for M2.5–M2.6, PH1 or PH2 for M3 |
| Washer Outer Diameter |
5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 9mm, or 10mm — specified per variant in parentheses |
| Material Options |
Carbon Steel or Stainless Steel — see variant options |
| Finish Options |
Bright Nickel / White Zinc / Black Zinc / Colored Zinc (Carbon Steel); Plain (Stainless Steel) |
| Tensile Strength |
Typically ≥420 MPa (Carbon Steel, varies by grade); typically ≥700 MPa (Stainless A2-70) |
| Pack Quantities |
100 / 200 / 300 pieces — see variant options |
| Country of Origin |
Contact us to confirm |
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Note: M2.5, M2.6, and M3 threads are not interchangeable. Verify your thread size before ordering. The washer OD is listed in parentheses in each variant name — confirm the washer diameter fits your application. The M3 x 48mm variant is a specialty long-length option; verify thread engagement requirements before use.
❓ Frequently Asked Questions
What does “pan head with washer” or SEMS mean for machine screws?
A pan head with washer screw (also called a SEMS screw) has a free-spinning washer pre-assembled under the head before threading. The washer cannot be removed without cutting it off. This design eliminates the need to handle separate washers during assembly, speeds up installation, and ensures the washer is always present and correctly positioned under the head — reducing assembly errors and dropped-washer delays on the production line or workbench.
How do I choose the right screw length?
Select a length so that at least 1.5–2 times the thread diameter engages in the mating material. For M3 screws, that means at least 4.5–6mm of thread engagement. For example, if your panel is 3mm (about 1/8") thick, an M3 x 8mm or M3 x 10mm screw is typically appropriate. Note that the integrated washer adds a small amount of height under the head — account for this when calculating total stack height in tight assemblies.
What is the washer outer diameter (OD) for each variant, and how do I choose?
The washer OD is specified in parentheses in each variant name. For example, “M3 x 6mm (Washer 9mm)” means the integrated washer has a 9mm outer diameter. Choose the washer OD based on the clearance hole or surface area you need to cover. A larger washer OD distributes the clamping load over a wider area, which is useful in softer materials like plastic or thin sheet metal to prevent pull-through. A smaller washer OD is better for tight spaces or when the clearance hole is close to an edge.
What is M2.6 and where is it commonly used?
M2.6 is a less common metric thread size (approximately 2.6mm diameter, 0.45mm pitch) used primarily in Japanese-manufactured electronics, cameras, and optical equipment. It is not interchangeable with M2.5 or M3 — the thread pitch and diameter are different enough that forcing the wrong size will strip threads. If your device uses M2.6 screws, you must use M2.6 replacements. A thread gauge or caliper measurement is the most reliable way to confirm the size before ordering.
Are these screws suitable for outdoor or corrosive environments?
It depends on the finish selected. Stainless steel variants offer good general corrosion resistance and are suitable for most outdoor and mildly humid environments. Carbon steel variants with zinc plating (white, black, or colored) provide moderate corrosion protection for indoor or sheltered use. Bright nickel-plated carbon steel is primarily decorative with moderate indoor corrosion resistance. For marine or highly corrosive environments, stainless steel is generally the better choice.
What thread standard do these screws use — are they compatible with my existing hardware?
These screws use the ISO metric thread standard. M2.5 has a standard coarse pitch of 0.45mm, M2.6 has a pitch of 0.45mm, and M3 has a standard coarse pitch of 0.5mm. They are compatible with standard metric nuts, threaded inserts, and tapped holes of the corresponding size. They are not compatible with UNC or UNF inch-standard threads. Each size is also not interchangeable with the others — verify your thread size with a gauge before ordering.
How strong are these small metric pan head machine screws?
Carbon steel M2.5–M3 machine screws are generally rated to property class 4.8 or higher, with tensile strengths typically ranging from 420 MPa to 800 MPa depending on the specific grade. Stainless steel variants are generally rated to A2-70, with a tensile strength of approximately 700 MPa. For small-diameter screws like M2.5–M3, actual load capacity is limited by the thread cross-section and is suitable for light-duty fastening in electronics, enclosures, and precision instruments. Contact us to confirm the exact property class if your application has specific strength requirements.
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