⚫ Product Overview: M4 Pozi Pan Head Screws – Black Zinc Plated Stainless (DIN 7985)
If you’ve ever struggled with a Phillips driver slipping out just as you’re about to tighten a screw, it’s time to try Pozidriv. These M4 Pozi pan head machine screws feature the Pozidrive (Pozi) recess – designed to give you better bite and less cam‑out than standard Phillips. Made from 304 stainless steel with a black zinc plating, they combine the corrosion resistance of stainless with a sleek, dark finish that blends perfectly with black anodized parts or powder‑coated panels. Manufactured to DIN 7985 standards, these fully threaded bolts are ideal for furniture, automotive trim, marine hardware, and any project where a clean, low‑profile, rust‑resistant fastener matters. Length is measured under the head – choose from various options.
✨ Why Upgrade to Black Zinc Pozi Pan Head Screws?
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Pozidriv (Pozi) drive – Distinct from Phillips, the extra cross‑recesses provide greater torque transfer and significantly reduce cam‑out. Your driver stays engaged, even under load.
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304 stainless steel core with black zinc plating – The base material offers excellent corrosion resistance; the black zinc finish adds a uniform dark, matte appearance and extra protection.
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DIN 7985 standard pan head – Low-profile rounded head with a flat bearing surface. Ideal for sheet metal, plastic casings, and wood where a neat finish is desired.
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M4 metric size – fully threaded – Threads run the entire length from under the head to the tip. M4 coarse pitch (0.7mm) for maximum grip in thin materials.
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Length measured under the head – No confusion: an M4 x 20mm screw has 20mm of threaded shank below the pan head.
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Wide material options available – Also offered in 316 stainless, 201 stainless, or carbon steel upon request. Various plating finishes (black zinc, nickel, or untreated).
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Reliable packaging – Supplied in plastic bags or paper boxes to keep screws organized.
📏 Technical Specifications – M4 Pozi Pan Head Screws (DIN 7985)
| Specification |
Details |
| Product Type |
Pozi Pan Head Machine Screws (Pozidriv drive) |
| Material |
304 Stainless Steel (with black zinc plating) – other materials available on request |
| Drive Style |
Pozidriv (Pozi) – use PZ2 driver bit |
| Head Style |
Pan Head / Round Head (low profile, flat bearing surface) |
| System of Measurement |
Metric |
| Screw Size |
M4 (4mm diameter) |
| Thread Pitch |
0.7mm (standard metric coarse) |
| Thread Type |
Fully threaded (full length from under head to tip) |
| Length Measurement |
Length excludes head – measured from underside of head to tip (e.g., M4 x 20mm = 20mm thread length) |
| Standard |
DIN 7985 |
| Finish |
Black zinc plated (matte dark) |
❓ FAQs – M4 Pozi Pan Head Black Zinc Screws
🔸 What’s the difference between Pozidriv and Phillips? What driver bit do I need?
Pozidriv has additional smaller cross‑recesses at 45° angles and a blunter tip. A Phillips driver will fit loosely and will cam‑out or damage the recess. Always use a genuine Pozidriv (Pozi) bit – for M4, use PZ2. Using the correct bit gives you much better torque without slipping.
🔸 Why does stainless steel sometimes show magnetism?
304 stainless is austenitic and normally non‑magnetic. However, cold working (like thread rolling or head forming) can transform some austenite into martensite, which is magnetic. So a slight magnetic response is normal and does not affect corrosion resistance.
🔸 How can I verify these are genuine 304 stainless?
You can use a 304 stainless test solution (no color change indicates authentic 304), perform chemical or spectral analysis, or conduct a salt spray test. Our screws meet standard 304 composition and performance requirements.
🔸 Will the black zinc finish wear off over time?
Black zinc provides good durability for normal use. With repeated driving, the recess and thread tips may show some silver wear, but the overall finish holds up well for indoor and protected outdoor applications. The underlying stainless steel ensures corrosion protection even if the black color fades.
🔸 What are the differences between 201, 304, and 316 stainless steel?
201 stainless is economical but rusts in wet conditions – best for dry indoor use. 304 stainless is the standard for outdoor or humid environments – strong corrosion and acid resistance. 316 stainless contains molybdenum for superior pitting and saltwater resistance – ideal for marine and chemical media.
🔸 Do you offer other materials or finishes for M4 Pozi pan head screws?
Yes – we can supply these screws in 201 stainless, 316 stainless, or carbon steel. Finishes include untreated (natural), black zinc, or nickel plating. Contact us for custom orders.
