M3 M4 M5 M6 M8 COUNTERSUNK SCREWS ALLEN KEY SOCKET BOLTS HIGH TENSILE STEEL 10.9
M3 M4 M5 M6 M8 COUNTERSUNK SCREWS ALLEN KEY SOCKET BOLTS HIGH TENSILE STEEL 10.9
M3 M4 M5 M6 M8 COUNTERSUNK SCREWS ALLEN KEY SOCKET BOLTS HIGH TENSILE STEEL 10.9
M3 M4 M5 M6 M8 COUNTERSUNK SCREWS ALLEN KEY SOCKET BOLTS HIGH TENSILE STEEL 10.9
M3 M4 M5 M6 M8 COUNTERSUNK SCREWS ALLEN KEY SOCKET BOLTS HIGH TENSILE STEEL 10.9
M3 M4 M5 M6 M8 COUNTERSUNK SCREWS ALLEN KEY SOCKET BOLTS HIGH TENSILE STEEL 10.9
M3 M4 M5 M6 M8 COUNTERSUNK SCREWS ALLEN KEY SOCKET BOLTS HIGH TENSILE STEEL 10.9
M3 M4 M5 M6 M8 COUNTERSUNK SCREWS ALLEN KEY SOCKET BOLTS HIGH TENSILE STEEL 10.9
M3 M4 M5 M6 M8 COUNTERSUNK SCREWS ALLEN KEY SOCKET BOLTS HIGH TENSILE STEEL 10.9

M3 M4 M5 M6 M8 COUNTERSUNK SCREWS ALLEN KEY SOCKET BOLTS HIGH TENSILE STEEL 10.9

$6.60 USD
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🔩 M4-M8 SIZES ⚙️ A2-70 STAINLESS STEEL 🇩🇪 DIN7991 STANDARD

Premium Countersunk Socket Head Screws

Flush-mounting socket screws for seamless, professional installations! Perfect for applications requiring a smooth surface and clean aesthetic appearance.

⭐ Key Features of Our Countersunk Screws

Our countersunk socket screws are engineered for precision and performance in demanding applications:

🔩 M4 M5 M6 M8 Sizes ⚙️ A2-70 Stainless Steel 🛡️ Corrosion Resistant 📏 DIN7991 Standard 🔑 Allen Key Drive 💪 Fully Threaded 🌀 Flush Mount Design 📦 Custom Quantity Options

📐 Available Sizes & Allen Key Requirements

Choose from four popular metric sizes for your project:

🔩
M4  2.5mm Allen Key8mm Head Ø
⚙️
M5 3mm Allen Key 10mm Head Ø
🏗️
M6 4mm Allen Key 12mm Head Ø
🚗
M8 5mm Allen Key 16mm Head Ø

📊 Technical Specifications

Specification M4 Details M5 Details M6 Details M8 Details
Thread Diameter 4mm 5mm 6mm 8mm
Thread Pitch 0.7mm 0.8mm 1.0mm 1.25mm
Allen Key Size 2.5mm 3mm 4mm 5mm
Head Diameter 8mm 10mm 12mm 16mm
Head Height 3.4mm 4.1mm 4.9mm 6.2mm
Common Applications Electronics, small assemblies General machinery, furniture Industrial equipment, automotive Heavy machinery, structural
General Specification Details
Product Type Countersunk Socket Head Screws / Socket Flat Head Screws
Material A2-70 Stainless Steel (304 Equivalent)
Standard DIN7991 (German Industrial Standard)
Thread Type Standard Metric Coarse Thread (Most Common)
Thread Coverage Fully Threaded (Entire Shaft Length)
Surface Finish Untreated (Natural Stainless Finish)
Measurement Note Screw lengths measured overall, including the head height
Corrosion Resistance Excellent - Suitable for Outdoor & Marine Applications
Head Angle Standard 90° Countersink (ISO/DIN Standard)

✅ Advantages of Countersunk Design

Why choose countersunk socket screws? These flush-mounting screws offer unique benefits:

  • Flush surface finish - Screw head sits completely within the material for a smooth surface
  • Safety improvement - No protruding heads to catch on objects or clothing
  • Aesthetic appearance - Clean, professional look for visible applications
  • Reduced obstruction - Allows sliding or movement over installed surfaces
  • Better aerodynamics - Important for automotive and aerodynamic applications
  • Easy cleaning - Smooth surfaces are easier to wipe clean and maintain

🏭 Common Applications

Our countersunk Allen screws are ideal for:

🔌

Electronics & Devices

Computer cases, audio equipment, control panels, enclosures

🚗

Automotive & Aerospace

Body panels, interior trim, access panels, fairings

🪑

Furniture & Cabinetry

Flat-pack furniture, cabinet hardware, joinery, fixtures

⚙️

Machinery & Equipment

Access panels, guards, covers, and machinery housings

🏗️

Metal Fabrication

Sheet metal assemblies, structural frames, and welded projects

🚤

Marine Applications

Boat fittings, deck hardware, marine equipment

🔧 Countersinking Installation Guide

For proper installation of countersunk socket screws:

  1. Select the correct countersink bit - Match to the screw head diameter and 90° angle
  2. Drill pilot hole - Appropriate size for thread diameter
  3. Countersink the hole - Depth should allow the screw head to sit flush or slightly below the surface
  4. Use the correct Allen key - Ensure proper fit in the socket to prevent stripping
  5. Tighten gradually - Avoid overtightening, which can damage the countersink
  6. Check flushness - Head should be even with or slightly below the material surface

❓ Frequently Asked Questions

Q: What's the difference between countersunk and flat head screws? 🔩
A: Countersunk screws have a conical head designed to sit flush within a countersunk (conical) hole. Flat head screws may refer to screws with a flat top surface, but not necessarily a conical shape. Our screws are true countersunk screws with a standardized 90° head angle for flush mounting in properly prepared holes.
Q: How are these screws measured since they include the head? 📏
A: Unlike most screws, measured from under the head, countersunk socket screws are measured overall, including the head height. This is because the head sits within the material, so the total length, including head, determines how deep the screw will go. This measurement standard ensures proper fit in countersunk applications.
Q: What angle are the countersink heads? 📐
A: These countersunk Allen screws have a standard 90° head angle (82° is also common but less standard). This matches standard countersink bits and ensures proper seating in prepared holes. Always verify your countersink tool matches the screw head angle for optimal flush installation.
Q: Are these suitable for outdoor applications? 🌧️
A: Yes! Our A2 stainless steel countersunk screws offer excellent corrosion resistance, making them suitable for outdoor, marine, and high-moisture environments. The flush design is particularly beneficial for outdoor applications as it prevents water pooling and reduces places for corrosion to start.
Q: What is the DIN 7991 standard? 🇩🇪
A: DIN7991 is a German industrial standard that specifies the dimensions, tolerances, and technical requirements for countersunk head socket screws. This widely recognized standard ensures consistent quality, compatibility, and performance. It covers head dimensions, socket size, thread specifications, and material requirements.
Q: Can I use these in wood applications? 🪵
A: Absolutely. While often used in metal, countersunk socket screws work excellently in wood when proper countersinking is done. The Allen drive provides superior torque transmission compared to Phillips or slotted drives. Ensure you use the correct size countersink bit for wood to create a clean recess for the screw head.

🚚 Fast Shipping & Premium Quality

Quick Dispatch & European Standards: Orders placed Monday-Friday are typically dispatched the next business day. These countersunk socket screws are manufactured to exacting DIN7991 standards, ensuring precise dimensions, consistent quality, and reliable performance for your professional and DIY projects requiring flush-mounting solutions.