Hex Socket Flat Head Machine Screws M2–M5 — Allen Drive Countersunk, Multiple Finishes, 100 or 200 Pack - HomeDIYer
Hex Socket Flat Head Machine Screws M2–M5 — Allen Drive Countersunk, Multiple Finishes, 100 or 200 Pack - HomeDIYer
Hex Socket Flat Head Machine Screws M2–M5 — Allen Drive Countersunk, Multiple Finishes, 100 or 200 Pack - HomeDIYer
Hex Socket Flat Head Machine Screws M2–M5 — Allen Drive Countersunk, Multiple Finishes, 100 or 200 Pack - HomeDIYer
Hex Socket Flat Head Machine Screws M2–M5 — Allen Drive Countersunk, Multiple Finishes, 100 or 200 Pack - HomeDIYer
Hex Socket Flat Head Machine Screws M2–M5 — Allen Drive Countersunk, Multiple Finishes, 100 or 200 Pack - HomeDIYer
Hex Socket Flat Head Machine Screws M2–M5 — Allen Drive Countersunk, Multiple Finishes, 100 or 200 Pack - HomeDIYer
Hex Socket Flat Head Machine Screws M2–M5 — Allen Drive Countersunk, Multiple Finishes, 100 or 200 Pack - HomeDIYer
Hex Socket Flat Head Machine Screws M2–M5 — Allen Drive Countersunk, Multiple Finishes, 100 or 200 Pack - HomeDIYer
Hex Socket Flat Head Machine Screws M2–M5 — Allen Drive Countersunk, Multiple Finishes, 100 or 200 Pack - HomeDIYer
Hex Socket Flat Head Machine Screws M2–M5 — Allen Drive Countersunk, Multiple Finishes, 100 or 200 Pack - HomeDIYer
Hex Socket Flat Head Machine Screws M2–M5 — Allen Drive Countersunk, Multiple Finishes, 100 or 200 Pack - HomeDIYer
Hex Socket Flat Head Machine Screws M2–M5 — Allen Drive Countersunk, Multiple Finishes, 100 or 200 Pack - HomeDIYer
Roll over image to zoom in Click on image to zoom
Hex Socket Flat Head Machine Screws M2–M5 — Allen Drive Countersunk, Multiple Finishes, 100 or 200 Pack - HomeDIYerHex Socket Flat Head Machine Screws M2–M5 — Allen Drive Countersunk, Multiple Finishes, 100 or 200 Pack - HomeDIYerHex Socket Flat Head Machine Screws M2–M5 — Allen Drive Countersunk, Multiple Finishes, 100 or 200 Pack - HomeDIYerHex Socket Flat Head Machine Screws M2–M5 — Allen Drive Countersunk, Multiple Finishes, 100 or 200 Pack - HomeDIYerHex Socket Flat Head Machine Screws M2–M5 — Allen Drive Countersunk, Multiple Finishes, 100 or 200 Pack - HomeDIYerHex Socket Flat Head Machine Screws M2–M5 — Allen Drive Countersunk, Multiple Finishes, 100 or 200 Pack - HomeDIYerHex Socket Flat Head Machine Screws M2–M5 — Allen Drive Countersunk, Multiple Finishes, 100 or 200 Pack - HomeDIYerHex Socket Flat Head Machine Screws M2–M5 — Allen Drive Countersunk, Multiple Finishes, 100 or 200 Pack - HomeDIYerHex Socket Flat Head Machine Screws M2–M5 — Allen Drive Countersunk, Multiple Finishes, 100 or 200 Pack - HomeDIYerHex Socket Flat Head Machine Screws M2–M5 — Allen Drive Countersunk, Multiple Finishes, 100 or 200 Pack - HomeDIYerHex Socket Flat Head Machine Screws M2–M5 — Allen Drive Countersunk, Multiple Finishes, 100 or 200 Pack - HomeDIYerHex Socket Flat Head Machine Screws M2–M5 — Allen Drive Countersunk, Multiple Finishes, 100 or 200 Pack - HomeDIYerHex Socket Flat Head Machine Screws M2–M5 — Allen Drive Countersunk, Multiple Finishes, 100 or 200 Pack - HomeDIYer

Hex Socket Flat Head Machine Screws M2–M5 — Allen Drive Countersunk, Multiple Finishes, 100 or 200 Pack

HomeDIYer
No reviews

By HomeDIYer®

Price:
$5.97 USD
Stock:
In stock (500 units), ready to be shipped

Payment & Security

Ach Direct Debit Amazon American Express Apple Pay Bancontact BLIK Diners Club Discover EPS Google Pay iDEAL Wero JCB Maestro Mastercard Multibanco MobilePay PayPal Przelewy24 Shop Pay Twint Union Pay USDC Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Limited Offer — Spend More, Save More
Spend $55+
Save $5
Spend $100+
Save $10
Spend $200+
Save $25
✅ Discount applied automatically at checkout 🚚 Free shipping on orders over $89
HomeDIYer DIY Expert Support

DIY Expert Support

Get fitment advice & recommendations

Mon–Fri  8:30 AM – 8:00 PM
WhatsApp
24-Hour Fast Ship
Arrives in 3–14 Days
Worldwide Shipping
30-Day Returns
1 tree planted with every purchase

Description

 

Hex Socket Countersunk Machine Screws M2–M5 — Flush-Mount Allen Drive for Clean, Precise Assemblies

When a protruding screw head is not an option — whether you're assembling an electronics enclosure, mounting a camera plate, building precision jigs, or finishing furniture hardware — you need a countersunk screw that sits perfectly flush. Hex socket countersunk machine screws give makers, engineers, and DIYers the torque control of an Allen drive with the clean, recessed profile of a flat head. Finding the right size, finish, and quantity in one place is the challenge this listing solves.

Each pack contains either 100 or 200 pieces of the same material, size, and length combination. Screws are available in M2, M2.5, M3, M4, and M5 metric coarse thread, with lengths ranging from 4.5mm (≈3/16") to 25mm (≈1") depending on the size selected. Material options span seven finishes: Carbon Steel / Bright Nickel, Carbon Steel / Black Nickel, Carbon Steel / Black Zinc, Carbon Steel / Zinc Nickel Alloy Black, Carbon Steel / Zinc Alloy Black With Glue (nylon patch locking), Stainless Steel, and Stainless Steel / Electrophoresis Black. Select your combination from the variant options above.

Typical applications include securing PCB standoffs and electronics panel covers where a flush surface is required, assembling aluminum extrusion frames and CNC-machined parts with M3 hex socket flat head screws, mounting optics and camera accessories that demand vibration resistance (especially the nylon-patch locking variant), and installing furniture cam-lock hardware or decorative panel fasteners where screw heads must not protrude. Long-tail searches like black countersunk Allen screws M4 bulk pack and stainless steel flat head hex socket screws M5 describe exactly what this listing covers.

🔩 Thread Compatibility: ISO metric coarse thread — M2, M2.5, M3, M4, M5. Compatible with standard metric nuts, threaded inserts, and tapped holes. Not compatible with UNC/UNF inch-standard threads.

✅ Key Features of These Hex Socket Countersunk Machine Screws

  • 🔧 Allen Drive Hex Socket — The internal hex recess allows higher torque transfer than Phillips or slotted drives, reducing cam-out risk during installation in tight spaces or with power drivers.
  • 📐 Countersunk Flat Head Profile — The 90° countersunk head sits flush with or below the surface when installed in a properly chamfered hole, eliminating snag points on electronics panels, jigs, and furniture faces.
  • 🎨 Seven Finish Options — From bright nickel to matte electrophoresis black, the finish range covers both functional corrosion protection and aesthetic matching for anodized aluminum, powder-coated steel, and dark enclosures.
  • 🔒 Nylon Patch Locking Variant — The "Zinc Alloy Black With Glue" option features a factory-applied thread-locking patch that resists loosening from vibration without liquid thread locker — ideal for motor mounts, camera rigs, and mechanical assemblies.
  • 🦠 Stainless Steel Option for Corrosion Resistance — Plain and electrophoresis black stainless steel variants provide reliable performance in humid, outdoor, or mildly corrosive environments where carbon steel finishes may degrade over time.
  • 📦 100 or 200 Piece Packs — Bulk quantity options reduce per-unit cost for workshop stock, production runs, and maintenance kits. Each pack contains a single consistent size, length, and finish combination.

📐 Technical Specifications — Hex Socket Countersunk Machine Screws

Drive Type Hex Socket (Allen / Internal Hex)
Head Style Countersunk Flat Head (90° included angle)
Thread Standard ISO Metric Coarse (DIN 7991 / ISO 10642)
Available Sizes M2, M2.5, M3, M4, M5
Available Lengths 4.5mm (≈3/16") to 25mm (≈1") — varies by size; see variant options
Material Options Carbon Steel (various finishes); Stainless Steel (plain & electrophoresis black)
Finish Options Bright Nickel, Black Nickel, Black Zinc, Zinc Nickel Alloy Black, Zinc Alloy Black With Glue (nylon patch), Electrophoresis Black
Locking Feature Nylon thread-locking patch ("With Glue" variant only)
Pack Quantity 100 pcs or 200 pcs (select above)
Tensile Strength Typically Class 8.8–10.9 (carbon steel); A2-70 (stainless) — contact us to confirm
Hex Key Size Required 1.5mm–4mm depending on screw size — see FAQ below
Country of Origin See variant options

❓ Frequently Asked Questions

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

For countersunk screws, the listed length includes the entire screw from the top of the head to the tip. Measure the total thickness of the material being fastened, then add the depth of thread engagement needed in the base material — typically at least 1.5× the screw diameter. For example:

  • M3 screw (3mm diameter) → generally needs at least 4.5mm thread engagement in the base
  • M4 screw (4mm diameter) → generally needs at least 6mm thread engagement in the base

Available lengths in this listing range from 4.5mm (≈3/16") to 25mm (≈1") depending on the size. When in doubt, choose the next length up.

What hex key (Allen wrench) size do I need for each screw size?

Hex socket sizes typically correspond to screw diameter as follows:

  • M2 — typically 1.5mm hex key
  • M2.5 — typically 1.5mm or 2mm hex key
  • M3 — typically 2mm or 2.5mm hex key
  • M4 — typically 3mm hex key
  • M5 — typically 4mm hex key

Always do a test fit before applying torque to avoid stripping the socket recess.

What is the tensile strength of these screws?

Carbon steel variants are generally equivalent to ISO property class 8.8 or 10.9 depending on the specific finish and heat treatment. Stainless steel variants are typically A2-70 grade. For safety-critical, structural, or load-bearing applications, please contact us to confirm the exact grade before ordering.

Can these screws be used outdoors or in corrosive environments?

It depends on the finish selected:

  • Stainless Steel (plain or electrophoresis black) — suitable for outdoor, humid, and mildly corrosive environments
  • Carbon Steel / Black Nickel, Black Zinc, Zinc Nickel Alloy Black — moderate corrosion resistance; suitable for indoor and sheltered outdoor use
  • Carbon Steel / Bright Nickel — primarily decorative; best for dry indoor applications

For marine or highly corrosive environments, stainless steel is generally the recommended choice.

What thread standard do these screws use — are they compatible with metric nuts and inserts?

These screws use ISO metric coarse thread (M2, M2.5, M3, M4, M5). They are compatible with standard metric hex nuts, nylon lock nuts, threaded inserts, and tapped holes of the matching size and pitch. They are not compatible with UNC or UNF inch-standard threads. Always verify the thread designation matches your application before ordering.

What is the "Zinc Alloy Black With Glue" finish — does it lock in place?

The "With Glue" designation refers to a factory-applied nylon thread-locking patch on the screw threads. This creates a prevailing torque that resists loosening from vibration without requiring a separate lock washer or liquid thread locker. Key points:

  • Effective for motor mounts, camera rigs, and mechanical assemblies subject to vibration
  • This is a single-use locking feature — once removed, the patch loses most of its locking effectiveness
  • Not recommended for applications requiring frequent disassembly
Which finish should I choose for electronics enclosures or a clean aesthetic look?

For a sleek, dark appearance in electronics enclosures, camera rigs, or furniture hardware:

  • Carbon Steel / Black Nickel — uniform dark finish, good for anodized aluminum and powder-coated surfaces
  • Stainless Steel / Electrophoresis Black — dark finish with added corrosion resistance; popular for outdoor camera mounts and precision instruments

For a bright silver finish, Carbon Steel / Bright Nickel or plain Stainless Steel are typically preferred. The Zinc Nickel Alloy Black finish offers a slightly deeper black tone with enhanced corrosion resistance compared to standard black nickel.

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

You may also like

Recently viewed