Round Head Machine Screws M2 M2.5 M2.6 | Carbon Steel & Stainless | 100–500 PCS - HomeDIYer

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Round Head Machine Screws M2 M2.5 M2.6 | Carbon Steel & Stainless | 100–500 PCS

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By HomeDIYer®

Material: Carbon Steel / Black Nickel

Thread Diameter x Length: M2 x 9.5 mm

Amount: 100 PCS

Price:

$7.48 USD

Stock:

In stock (500 units), ready to be shipped

Quantity:

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Round Head Machine Screws M2 M2.5 M2.6 — Reliable Fastening for Precision Assemblies

When you're assembling electronics enclosures, RC components, camera rigs, or small mechanical devices, finding the right small-diameter machine screw in the correct finish can be a real headache. Stripped threads, mismatched coatings, and packs too small for a production run all slow you down. These round head machine screws in M2, M2.5, and M2.6 are stocked specifically for makers, engineers, and repair technicians who need reliable small fasteners on hand.

Each pack contains 100 to 500 pieces of metric round head machine screws made from either carbon steel or stainless steel. Carbon steel variants are available in multiple surface finishes — black nickel, black zinc, blue-white zinc, bright nickel, colored zinc, and white zinc — with select options featuring a pre-applied thread-locking patch. Thread diameters range from M2 to M2.6, with lengths spanning 4 mm (5/32") to 24.5 mm (approximately 31/32"), covering the most common small-screw applications.

These screws are well suited for securing PCB standoffs and circuit board covers, assembling hobby robotics and drone frames, and fastening precision instrument housings where a low-profile round head is required. The variety of finishes makes them a go-to for small machine screw assortment restocking in any workshop.

🔩 Compatibility: Metric ISO/DIN thread standard. M2, M2.5, and M2.6 screws are not interchangeable with imperial UNC/UNF threads of similar diameter. Verify your tapped hole or nut thread pitch before ordering.

✅ Key Features of These Round Head Machine Screws

📐Wide Size Range — Thread diameters M2, M2.5, and M2.6 with lengths from 4 mm to 24.5 mm (5/32" to approximately 31/32") cover the most common small machine screw applications in electronics and precision assembly.
🛡️Multiple Finish Options — Choose from black zinc, blue-white zinc, bright nickel, colored zinc, white zinc, or black nickel on carbon steel, or go with stainless steel for corrosion-resistant fastening without a plated coating.
🔒Thread-Locking Variants Available — Select "With Glue" options include a factory-applied thread-locking patch that activates under torque, helping prevent loosening in vibration-prone assemblies like motors and fans — no separate threadlocker needed.
⚙️Round (Pan) Head Profile — The low-profile domed head distributes clamping load evenly and sits flush against thin panels, making these screws a natural fit for electronics enclosures, instrument covers, and compact mechanical assemblies.
📦Flexible Pack Quantities — Available in 100, 200, 300, 400, or 500 piece packs so you can match your order to a one-off repair, a small production run, or ongoing workshop stock without overpaying for quantity you don't need.
🏭Consistent Dimensional Accuracy — Manufactured to metric ISO/DIN dimensional standards, these screws are designed to thread reliably into standard M2 to M2.6 tapped holes and nuts, reducing the risk of cross-threading in close-tolerance assemblies.

📐 Technical Specifications — Round Head Machine Screws

Screw Type	Round Head (Pan Head) Machine Screw
Thread Standard	Metric ISO/DIN
Thread Diameters	M2, M2.5, M2.6
Available Lengths	4 mm – 24.5 mm (approximately 5/32" – 31/32"); see variant options for exact sizes
Material — Carbon Steel	Carbon steel with surface finish (see finish options)
Material — Stainless Steel	Stainless steel (natural/bare finish)
Available Finishes	Black Nickel, Black Zinc, Blue-White Zinc, Bright Nickel, Bright Nickel With Glue, Black Zinc With Glue, Colored Zinc, White Zinc, Stainless Steel
Thread-Locking Option	Available on select variants ("With Glue" — pre-applied patch)
Pack Quantities	100 / 200 / 300 / 400 / 500 PCS
Drive Type	See variant options / Contact us to confirm
Head Diameter (D)	Proportional to thread diameter per ISO standard; select variants specify D=4 mm or D=4.6 mm — see variant options
Corrosion Resistance	Stainless steel: good; Zinc/Nickel plated carbon steel: moderate (indoor/semi-protected use)
Recommended Use	Electronics assembly, precision instruments, hobby robotics, RC components, mechanical enclosures

⚠️ Note: Specific thread pitch and head dimensions vary by size. If your application requires exact tolerances, please contact us to confirm specifications before ordering.

❓ Frequently Asked Questions

How do I choose the right length for M2 or M2.5 round head machine screws?

A general rule: the screw length should equal the thickness of the material being fastened plus 1 to 1.5 times the thread diameter for thread engagement. For example, joining two 3 mm panels with M2.5 screws typically calls for a length of 8 to 10 mm (approximately 5/16" to 3/8"). When in doubt, choose the next size up — you can always add a washer to compensate. All lengths are listed in millimeters; divide by 25.4 to convert to inches.

What load can these small machine screws handle?

Carbon steel M2 to M2.6 screws generally handle light-to-moderate clamping loads suitable for electronics enclosures, hobby assemblies, and precision instruments. Stainless steel variants typically offer comparable tensile strength with added corrosion resistance. For structural or high-vibration applications, consult a load table or contact us to confirm the specific grade and proof load.

Are these screws suitable for outdoor or humid environments?

Stainless steel variants are generally suitable for outdoor and humid conditions. Carbon steel versions with zinc or nickel plating offer moderate corrosion resistance for indoor or semi-protected use. For fully exposed outdoor applications — especially near salt air or standing water — stainless steel is the recommended choice.

What thread standard do these screws use — metric or imperial?

These are metric machine screws following the ISO/DIN standard. M2, M2.5, and M2.6 designations refer to the nominal thread diameter in millimeters. They are not compatible with imperial (UNC/UNF) threaded holes of a similar size. Always verify your tapped hole or nut is metric before ordering.

Which finish should I choose — zinc, nickel, or stainless?

Black zinc and blue-white zinc offer good corrosion resistance at a lower cost and are common in electronics and general assembly. Bright nickel provides a polished appearance for visible fasteners. "With Glue" variants include a pre-applied thread-locking patch for vibration-prone assemblies. Colored zinc adds a decorative element while maintaining basic protection. Stainless steel is best when corrosion resistance is the top priority.

What driver type do round head machine screws use?

Round head (pan head) machine screws in M2 to M2.6 sizes typically use a Phillips (#0 or #1) or JIS cross-head drive. Some variants may use a slotted drive. Check the product images or contact us to confirm the drive type for your specific size and finish variant before purchasing.

What does the "With Glue" option mean?

"With Glue" variants have a pre-applied thread-locking adhesive patch on the threads. This patch activates under torque and helps prevent the screw from loosening due to vibration — useful in motors, cooling fans, and other dynamic assemblies. No separate threadlocker is needed, which saves time during assembly.

How many screws come in each pack, and can I buy in bulk?

Each listing is available in 100, 200, 300, 400, or 500 piece packs. Simply select your preferred quantity from the Amount option above. Larger packs offer a lower per-unit cost, making them ideal for production runs or keeping your workshop stocked with small machine screws without frequent reorders.

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