M1.2 M1.6 M2 M4 M5 M6 Slotted Countersunk Head Machine Screws Flat Bolts 3~25mm $5.86 USD

M1.2 M1.6 M2 M4 M5 M6 Slotted Countersunk Head Machine Screws Flat Bolts 3~25mm

Name: M1.2 M1.6 M2 M4 M5 M6 Slotted Countersunk Head Machine Screws Flat Bolts 3~25mm
Brand: HomeDIYer
SKU: GLFBTXJ2024JINGLONGWJ3709x100
Price: 5.86 USD
Availability: InStock

$5.86 USD

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By HomeDIYer^®

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M1.2–M6 Slotted Countersunk Head Machine Screws — Flush-Mount Fasteners Across a Wide Size Range

Finding the right small-diameter flat head screw in the correct material and finish is a recurring challenge for electronics assemblers, instrument makers, furniture builders, and general fabricators. When the fastener needs to sit flush with the surface — and the drive must be accessible with a standard flat-blade screwdriver — the options narrow quickly, especially at miniature sizes like M1.2 and M1.6.

These slotted countersunk head machine screws cover thread sizes from M1.2 to M6, with shank lengths from 3mm to 25mm (total length including head). Head diameters range from 2.3mm (M1.2) to 11.3mm (M6), with head thickness from 0.6mm to 3.4mm. Available in carbon steel, 304 stainless steel, and brass, with four finish options: Black Zinc, Brass Natural, 304 Stainless Steel Natural, and Nickel-Plated. Sold in packs of 100, 200, 300, 400, or 500 pieces.

Typical applications include electronics enclosures, optical and precision instruments, watch and clock assembly, furniture hardware, automotive interior panels, toy manufacturing, and general machinery where a flush, low-profile fastener is required.

🔩 Compatibility: Standard metric thread pitches (M1.2×0.25 through M6×1.0). Fits standard metric nuts and tapped holes. Requires a flat-blade (slotted) screwdriver matched to the slot width.

✅ Key Features of These Slotted Countersunk Head Machine Screws

📐 Wide Size Range — Thread diameters from M1.2 to M6, lengths from 3mm to 25mm, covering miniature electronics to general mechanical assembly in a single product line.
🔧 Slotted Flat-Blade Drive — Compatible with standard flat-blade screwdrivers; no specialty bits required, making these accessible for field repairs and general workshop use.
🪛 Flush-Mount Countersunk Head — Tapered head sits flush with or below the material surface when installed in a properly sized countersunk hole, providing a clean finished appearance.
🛡️ Four Finish Options — Black Zinc, Nickel-Plated, Brass Natural, and 304 Stainless Steel Natural to match corrosion resistance requirements and aesthetic preferences.
⚙️ Three Material Options — Carbon steel for general use, 304 stainless steel for corrosion-resistant applications, and brass for decorative or electrical contexts.
📦 Bulk Pack Sizes — Available in 100, 200, 300, 400, or 500-piece packs to match project scale and reduce per-unit cost for production runs.

📐 Technical Specifications — Slotted Countersunk Head Machine Screws M1.2–M6

Head Style	Countersunk (Flat Head)
Drive Style	Slotted (Flat-Blade)
Thread Sizes Available	M1.2, M1.6, M2, M4, M5, M6
Total Length Range (incl. head)	3mm – 25mm
Head Diameter Range	2.3mm (M1.2) – 11.3mm (M6)
Head Thickness Range	0.6mm – 3.4mm
Tolerance	±0.2mm
Material Options	Carbon Steel, 304 Stainless Steel, Brass
Finish / Coating Options	Black Zinc, Brass Natural, 304 Stainless Steel Natural, Nickel-Plated
Quantity per Pack	100, 200, 300, 400, or 500 PCS
Thread Standard	Metric (non-standard series)
System of Measurement	Metric

❓ Frequently Asked Questions

What is a slotted countersunk (flat) head screw?

A countersunk (flat) head screw has a tapered underside that allows the head to sit flush with or below the surface of the material when driven into a countersunk hole. The slotted drive means it is tightened with a flat-blade screwdriver.

What screwdriver do I need for slotted machine screws?

These screws use a standard flat-blade (slotted) screwdriver. Match the blade width to the slot width of the screw head for best torque transfer and to avoid damaging the slot.

What is the difference between Black Zinc, Nickel-Plated, Brass Natural, and 304 Stainless Steel finishes?

Black Zinc offers a dark matte appearance with moderate corrosion resistance. Nickel-Plated provides a bright silver finish with good corrosion and wear resistance. Brass Natural is uncoated brass with a warm gold tone, suitable for decorative and electrical applications. 304 Stainless Steel Natural is uncoated stainless steel with excellent corrosion resistance for demanding environments.

What thread pitch do these metric screws use?

Standard metric thread pitches apply: M1.2 (0.25mm), M1.6 (0.35mm), M2 (0.4mm), M4 (0.7mm), M5 (0.8mm), M6 (1.0mm). These are compatible with standard metric nuts and tapped holes of the same size.

What does 'D=' mean in the size specification?

'D=' refers to the head diameter of the countersunk screw. For example, M1.2 screws have a head diameter of 2.3mm, while M6 screws have a head diameter of 11.3mm. This is important when sizing your countersunk hole.

Are these screws suitable for electronics or precision instruments?

Yes. The small sizes (M1.2, M1.6, M2) are commonly used in electronics, optical instruments, watches, and precision devices where a flush-mount fastener is required. The tolerance range is ±0.2mm.

What is the tolerance range for these screws?

The dimensional tolerance range is ±0.2mm, which is standard for non-standard metric machine screws of this type.

Can I order a mix of sizes or finishes?

Each variant is sold separately by thread size, coating, and quantity. To get multiple sizes or finishes, simply add each desired variant to your cart individually.

🛒 Select your Thread Dia × Length, Coating, and Quantity above, then add to cart.