M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set - HomeDIYer
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M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer | Carbon Steel Bolt Set

HomeDIYer
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$15.98 USD
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In stock (500 units), ready to be shipped

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Description

 

M2–M6 Phillips Countersunk Head Machine Screws with Nut and Washer — Complete Carbon Steel Bolt Set for Flush-Mount Fastening

Sourcing a bolt, nut, and washer separately for every size wastes time and risks mismatched hardware. These M2–M6 Phillips countersunk head machine screw sets come with a matching hex nut and flat washer already included, giving woodworkers, hobbyists, electronics assemblers, and general DIYers a complete, ready-to-install fastener kit in one pack. The carbon steel construction delivers solid clamping strength for dry indoor applications where corrosion is not a concern.

Each set includes one Phillips flat (countersunk) head machine screw, one matching ISO hex nut, and one flat washer, all in carbon steel. Available in six diameters from M2 (2mm) through M6 (6mm), with bolt lengths from 4mm (≈5/32") up to 50mm (≈2") depending on diameter, sold in packs of 10, 20, or 50 sets. The flat washer in each set sits under the hex nut to distribute clamping load and protect soft mating surfaces.

Typical applications include assembling wood furniture, cabinetry, and shelving where a flush-mount countersunk screw with a backing nut and washer provides a clean, snag-free finish; securing plastic enclosures, hobby frames, and RC or electronics project panels where a Phillips countersunk carbon steel bolt set delivers a tidy, low-profile connection; and general-purpose indoor fastening in light metalwork, DIY builds, and repair projects where a complete bolt-nut-washer kit eliminates the need to source components separately.

🔵 Compatibility: ISO metric coarse thread — M2 (0.4mm pitch) through M6 (1.0mm pitch). Each set includes one countersunk bolt + one hex nut + one flat washer. Drive: Phillips PH1 (M2–M2.5) / PH2 (M3–M4) / PH2–PH3 (M5–M6). Head angle: 90° countersunk. Not compatible with UNC/UNF inch-standard threads.
⚠️ Note: Carbon steel is not corrosion-resistant. These sets are intended for dry indoor use. For outdoor or wet environments, stainless steel fasteners are recommended. A countersunk hole is required for a flush finish.

✅ Key Features of These M2–M6 Phillips Countersunk Carbon Steel Bolt Nut Washer Sets

  • 🔩 3-Piece Set: Bolt + Nut + Washer Included — Each pack contains a Phillips countersunk machine screw, a matching ISO hex nut, and a flat washer — everything needed to complete a through-bolt connection without sourcing components separately.
  • 🔘 Flush-Mount 90° Countersunk Head — The flat head sits flush with or below the mating surface when installed in a properly countersunk hole, eliminating protrusions that snag cables, catch on covers, or create an unfinished appearance in wood, plastic, and panel assemblies.
  • 🧲 Carbon Steel Construction for Indoor Strength — Carbon steel delivers solid tensile strength for general-purpose fastening in wood, plastic, and light metal, making these countersunk bolt sets a practical choice for furniture assembly, hobby builds, and DIY projects in dry indoor environments.
  • 📏 Wide Size Range: M2 Through M6, 4mm to 50mm — Six diameters from M2 (2mm) to M6 (6mm) with lengths from 4mm (≈5/32") to 50mm (≈2") cover thin-panel to medium-depth fastening needs across a broad range of small-to-medium DIY and assembly applications.
  • 📦 Flexible Pack Quantities: 10, 20, or 50 Sets — Order 10 sets for a small repair, 20 for a mid-size project, or 50 for a production run or workshop stock. Each pack quantity is priced per complete set (bolt + nut + washer), making it straightforward to calculate exactly how many fasteners you need.
  • ⚙️ ISO Metric Coarse Thread Standard — Standard metric coarse pitch threads (M2 × 0.4mm through M6 × 1.0mm) ensure drop-in compatibility with off-the-shelf metric nuts, threaded inserts, and tapped holes — no special adapters or thread converters needed for most metric applications.

📐 Technical Specifications — M2–M6 Phillips Countersunk Carbon Steel Machine Screw, Nut, and Washer Sets

Material Carbon Steel — bolt, nut, and washer
Finish / Coating See variant options (contact us to confirm specific surface treatment)
Head Style Countersunk / Flat Head (90° head angle)
Drive Type Phillips (PH1 for M2–M2.5; PH2 for M3–M4; PH2–PH3 for M5–M6)
Nut Type ISO Hex Nut (standard height, matching diameter and pitch)
Washer Type Flat Washer (one per set, placed under hex nut)
Available Diameters M2, M2.5, M3, M4, M5, M6
Thread Pitch (ISO Metric Coarse) M2: 0.4mm | M2.5: 0.45mm | M3: 0.5mm | M4: 0.7mm | M5: 0.8mm | M6: 1.0mm
Nut Wrench Size (typical) M2: 4mm AF | M2.5: 5mm AF | M3: 5.5mm AF | M4: 7mm AF | M5: 8mm AF | M6: 10mm AF
Length Range by Diameter M2: 5–25mm (≈3/16"–1") | M2.5: 4–30mm (≈5/32"–1-3/16") | M3: 6–50mm (≈1/4"–2") | M4: 5–50mm (≈3/16"–2") | M5: 6–50mm (≈1/4"–2") | M6: 8–40mm (≈5/16"–1-9/16")
Pack Quantities 10, 20, 50 sets (bolt + nut + washer per set)
Tensile Strength (typical) Generally 400–800 MPa depending on grade (contact us to confirm)
Corrosion Resistance Low — suitable for dry indoor use only; not recommended for outdoor or wet environments
Thread Standard ISO metric coarse (DIN 965 / ISO 7046 countersunk head equivalent)
Countersink Angle 90° (standard metric flat head)
Country of Origin See variant options

❓ Frequently Asked Questions

How do I choose the right bolt length for a countersunk screw?

For a countersunk (flat head) screw, the bolt length is measured from the top of the head to the tip — the head sits flush with or below the surface when fully driven. Measure the total thickness of all materials being fastened, then add the nut height plus 1–2 thread pitches of protrusion beyond the nut. For example, fastening two 5mm wood or plastic panels with an M4 countersunk bolt typically calls for an M4 × 14mm or 16mm bolt. When in doubt, size up slightly.

What is the difference between carbon steel and stainless steel screws?

Carbon steel screws are generally stronger and harder than A2 stainless steel at the same diameter, and are typically less expensive. However, carbon steel is susceptible to rust and corrosion when exposed to moisture unless protected by a coating. These screws are best suited for dry indoor applications. For outdoor or wet environments, stainless steel fasteners are generally recommended.

Can these carbon steel screws be used outdoors?

Carbon steel screws are generally not recommended for prolonged outdoor or wet exposure without additional corrosion protection such as paint, sealant, or a protective coating. For outdoor applications, stainless steel or hot-dip galvanized fasteners are typically a better choice. These sets are best suited for dry indoor use in wood, plastic, or light metal assemblies.

What is the washer included in each set used for?

Each set includes a flat washer to be used under the hex nut. The washer distributes the clamping load over a larger surface area, reducing the risk of the nut pulling through or damaging soft materials such as wood, plastic, or thin sheet metal. It also helps prevent the nut from loosening due to vibration in some applications.

Are the nuts and bolts matched — will they thread together correctly?

Yes. Each set includes a matching bolt and hex nut with the same ISO metric coarse thread standard. Thread pitches are: M2 × 0.4mm, M2.5 × 0.45mm, M3 × 0.5mm, M4 × 0.7mm, M5 × 0.8mm, M6 × 1.0mm. These are not compatible with UNC or UNF inch-standard threads.

How strong are carbon steel countersunk machine screws?

Carbon steel machine screws are generally stronger than equivalent stainless steel fasteners at the same size. Typical carbon steel machine screws meet property class 4.8 or higher, with tensile strength generally ranging from 400–800 MPa depending on grade and heat treatment. They are suitable for general-purpose fastening in wood, plastic, and light metal. For specific load requirements, contact us to confirm the grade.

Do I need to countersink the hole before installing these flat head screws?

Yes, for a true flush finish. Countersunk (flat head) screws are designed to sit flush with or below the surface, which requires a countersunk hole matching the head angle — typically 90° for metric machine screws. If installed in a straight-drilled hole without countersinking, the head will protrude above the surface. A countersink drill bit in the appropriate size is recommended for clean results.

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

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