M4 Countersunk Phillips Machine Screws — A2 Stainless Steel | 4mm to 100mm $2.03 USD

M4 Countersunk Phillips Machine Screws — A2 Stainless Steel | 4mm to 100mm

Name: M4 Countersunk Phillips Machine Screws — A2 Stainless Steel | 4mm to 100mm
Brand: HomeDIYer
SKU: BM0165-0
Price: 2.03 USD
Availability: InStock

$2.03 USD

In stock

By HomeDIYer^®

Quantity Discount Promotion

Your Pack Quantity:

Variant

Quantity:

Pickup currently unavailable at Illinois

Illinois

Pickup currently unavailable

150 Hastings Drive
Buffalo Grove IL 60089
United States

+18479091828

DIY Expert Support

Get fitment advice & recommendations

Mon-Fri, 8:30AM-8PM

WhatsApp Email

⚡

24-Hour Fast Ship

🚚

Arrives in 3-14 days

🌍

Global Reach

↩️

30-Day Returns

🌱 1 tree planted with every purchase

M4 Countersunk Phillips Machine Screws — A2 Stainless Steel, 4mm to 100mm

M4 countersunk Phillips screws are one of the most commonly specified fasteners in furniture, electronics, cabinetry, and general fabrication — but finding a reliable source with a full size range in one place is harder than it should be. These A2 stainless steel M4 flat head machine screws cover lengths from 4mm to 100mm (length measured including the head, as is standard for countersunk screws), with pack quantities from 1 piece up to 300 pieces. Whether you need a handful for a repair or a bulk pack for production, you can select exactly what you need.

The countersunk flat head sits flush with or below the surface when installed in a properly prepared hole, giving assemblies a clean, snag-free finish. Material is A2 (304) stainless steel for solid corrosion resistance in indoor and light outdoor environments. Drive is Phillips (PH2), compatible with standard screwdrivers and power tool bits. Thread is ISO metric coarse pitch M4 x 0.7mm, compatible with standard M4 nuts, threaded inserts, and tapped holes.

Typical applications include furniture and cabinet assembly, electronics enclosures and PC builds, automotive trim panels, machinery guards, DIY projects, and any application requiring a flush-mount M4 fastener in stainless steel. These M4 countersunk Phillips machine screws are a practical, corrosion-resistant choice for both professional and DIY use.

🔩 Compatibility: ISO metric coarse pitch M4 x 0.7mm — fits standard M4 nuts, threaded inserts, and tapped holes. Phillips PH2 drive. Requires a countersunk hole (90° included angle) for flush installation. Not self-tapping.

✅ Key Features of These M4 Countersunk Phillips Machine Screws

📐Countersunk Flat Head — Flush-Mount Finish — The 90° countersunk head sits flush with or below the surface when installed in a properly prepared hole, eliminating snag points and giving assemblies a clean, professional appearance.
📏Full Size Range — 4mm to 100mm — Available in 24 lengths from M4 x 4mm to M4 x 100mm (length includes the head), covering the most common M4 countersunk screw sizes for furniture, electronics, construction, and general fabrication.
🛡️A2 Stainless Steel (304 Grade) — A2 stainless provides solid corrosion resistance for indoor and light outdoor environments. Non-magnetic in its annealed state and widely used in furniture, electronics, and general construction hardware.
🔧Phillips PH2 Drive — Compatible with standard PH2 Phillips screwdrivers and power tool bits, making these screws straightforward to install with tools you already own.
🔩ISO Metric Coarse Pitch — M4 x 0.7mm — Standard metric thread compatible with M4 nuts, threaded inserts, and tapped holes. Fully threaded for maximum thread engagement and a secure hold.
📦Flexible Pack Quantities — Choose from 1 to 300 pieces per pack to match your project scale. Smaller packs for repairs and prototyping; larger packs for production runs and bulk stocking. Larger packs offer better per-unit value.

📐 Technical Specifications — M4 Countersunk Phillips Machine Screws

Material	A2 Stainless Steel (304 Grade)
Finish	Natural stainless (silver)
Head Type	Flat Head / Countersunk (90° included angle)
Drive Type	Phillips PH2
Thread Standard	ISO Metric Coarse Pitch — M4 x 0.7mm
Diameter	M4 (4mm)
Available Lengths	4mm – 100mm (length includes head)
Thread Type	Fully threaded machine screw
Pack Quantity Options	1 / 3 / 5 / 10 / 30 / 50 / 100 / 200 / 300 pcs
Countersink Angle	90° included angle
Corrosion Resistance	Good — suitable for indoor and light outdoor use
Self-Tapping	No — requires pre-tapped hole or nut

⚠️ Note: These are machine screws — they require a pre-tapped hole, threaded insert, or nut. They are not self-tapping. A countersink bit (90° angle) is required to prepare the hole for flush installation. Use a PH2 Phillips screwdriver or bit to avoid cam-out.

❓ Frequently Asked Questions

What does "length including head" mean for M4 countersunk screws?

For countersunk (flat head) screws, the listed length is measured from the top of the head to the tip of the thread — the total length of the screw. This is the ISO standard measurement for countersunk fasteners. When selecting a length, account for the full material thickness the screw will pass through, plus adequate thread engagement in the receiving part (typically 1.5× the screw diameter, so at least 6mm for M4).

What is A2 stainless steel and is it suitable for outdoor use?

A2 stainless steel is the ISO designation for 304-grade austenitic stainless steel. It offers good corrosion resistance in most indoor and light outdoor environments, including humid conditions. It is not recommended for harsh marine or highly corrosive environments — A4 (316) stainless is preferred for those applications. A2 is widely used in construction, furniture, electronics, and general fabrication.

What screwdriver do I need for M4 Phillips countersunk screws?

M4 Phillips countersunk screws typically use a PH2 (Phillips #2) screwdriver bit. Using the correct bit size is important to avoid cam-out and head damage. A quality screwdriver or power tool bit set with a PH2 tip is recommended for best results.

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

Yes. Flat head (countersunk) screws require a countersunk hole to sit flush with the surface. Without countersinking, the head will protrude above the surface. Use a countersink bit with a 90° included angle (standard for metric machine screws) to prepare the hole. The countersink diameter should match the head diameter of the M4 screw you are using.

Are these M4 screws compatible with standard metric nuts and threaded inserts?

Yes. These are ISO metric coarse-pitch M4 machine screws (M4 x 0.7mm pitch). They are compatible with standard M4 metric nuts, threaded inserts, and tapped holes. They are not compatible with UNC/UNF (inch) threads or fine-pitch M4 variants. Always verify the thread pitch and hole diameter before ordering.

What are common applications for M4 countersunk Phillips screws?

M4 countersunk Phillips screws are widely used in furniture and cabinet assembly, electronics enclosures and PC case building, automotive trim panels, machinery guards, shelving and racking, DIY home projects, and any application requiring a flush-mount M4 fastener. The A2 stainless material makes them suitable for both indoor and light outdoor use.

How many pieces come in each pack?

Pack quantities range from 1 piece up to 300 pieces depending on the screw length selected. Smaller packs (1, 3, 5 pcs) are available for longer lengths (50mm+). Larger packs (10, 30, 50, 100, 200, 300 pcs) are available for shorter lengths. Select your preferred quantity using the "Your Pack Quantity" selector. Larger packs offer better per-unit value for production or bulk use.

Are these screws self-tapping?

No. These are machine screws, not self-tapping screws. They require a pre-tapped hole, threaded insert, or nut. They will not cut their own thread into material. For self-tapping applications, a different screw type is required.

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