A2 Stainless Steel DIN 921 Slotted Large Pan Head Machine Screws — Reliable Wide-Head Fastening for Precision Work
When standard screws leave marks on delicate panels, pull through thin materials, or simply don't sit flush enough for your application, you need a fastener engineered for broad load distribution. These DIN 921 slotted large pan head machine screws are built for engineers, makers, and tradespeople who demand a low-profile, wide-bearing fastener without the hassle of adding a separate washer.
Machined from 304 stainless steel (Grade A2-70) with precision-rolled metric threads, these screws feature an extra-wide flat pan head that spreads clamping force evenly across the workpiece surface. Available in thread sizes M2 through M10 and lengths from 3mm to 40mm (0.12" to 1.57"), with full-thread engagement throughout the shank.
Ideal for electronics enclosure assembly, furniture hardware, instrumentation panels, model engineering, and any application where a flush, low-profile fastener with a large bearing surface is required. The polished bright finish also suits decorative or visible fastening points.
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Compatible with standard metric tapped holes — M2, M2.5, M3, M4, M5, M6, M8, M10. Driven with a flat-blade (slotted) screwdriver.
✅ Key Features of These DIN 921 Slotted Large Pan Head Machine Screws
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🦾 Extra-Wide Pan Head: Oversized head diameter distributes clamping load over a larger area — no separate washer needed in most applications.
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🛡️ 304 A2-70 Stainless Steel: Rust-resistant and corrosion-resistant for indoor, outdoor, and light industrial environments.
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📐 Low-Profile Flat Head: Minimal protrusion after installation — clean, flush appearance for visible or aesthetic fastening points.
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⚙️ Precision-Rolled Threads: Sharp, well-defined metric threads ensure smooth engagement, secure hold, and high vibration resistance.
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✨ Polished Bright Finish: Smooth surface finish suits decorative applications and reduces friction during installation.
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📦 Flexible Quantity Options: Available in 1, 2, 5, 10, 20, and 50-piece packs — order exactly what your project requires.
📐 Technical Specifications — DIN 921 Large Pan Head Machine Screws
| Standard |
DIN 921 / GB833 — Slotted Large Button Head Machine Screws |
| Material |
304 Stainless Steel (Grade A2-70) |
| Head Style |
Extra-Wide Flat Pan Head (Wafer Head) |
| Drive Type |
Slotted (Single Slot / Flat Blade) |
| Thread Type |
Metric Full Thread |
| Thread Sizes |
M2, M2.5, M3, M4, M5, M6, M8, M10 |
| Length Range |
3mm – 40mm (0.12" – 1.57") — varies by diameter |
| Finish |
Polished / Bright / Plain |
| System of Measurement |
Metric |
| Corrosion Resistance |
Suitable for atmospheric, indoor, and light outdoor environments |
| Quantity Options |
1 PCS / 2 PCS / 5 PCS / 10 PCS / 20 PCS / 50 PCS |
| Typical Applications |
Electronics, furniture hardware, instrumentation, model making, precision engineering |
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Size Reference: Product images show measurement reference points only. Proportions in photos do not represent actual visual scale. Please refer strictly to the size parameters listed in the variant selector (e.g., M3*10 = M3 thread × 10mm length).
❓ Frequently Asked Questions
What material are these screws made from?
These screws are made from 304 stainless steel (Grade A2-70), offering excellent corrosion resistance for indoor, outdoor, and light industrial use.
What standard do these screws conform to?
These screws conform to DIN 921 (GB833), the standard for slotted large button head machine screws with a wide flat pan head profile.
What sizes are available?
Available in metric thread sizes M2, M2.5, M3, M4, M5, M6, M8, and M10, with lengths typically ranging from 3mm to 40mm depending on the diameter. Select your exact size using the variant options above.
Do I need a washer with these screws?
Generally no. The extra-wide pan head distributes clamping load over a larger surface area, eliminating the need for a separate washer in most applications.
What drive tool do I need?
These screws use a slotted (single-slot) drive. A standard flat-blade screwdriver of the appropriate tip width is required. No special bits needed.
Are these screws suitable for outdoor use?
Yes. 304 stainless steel provides good resistance to atmospheric corrosion and oxidation, making these screws suitable for typical outdoor environments. For highly corrosive or marine environments, 316 stainless steel is typically recommended.
How do I choose the right length?
As a general rule, the engaged thread length should be at least 1.5× the screw diameter for metal, or 2–3× for softer materials like plastic or wood composites. The variant name format is Diameter × Length (e.g., M4*12 = M4 thread, 12mm long).
What is the difference between DIN 921 and a standard pan head screw?
DIN 921 specifies an extra-large head diameter relative to the thread size — typically 2–3× wider than a standard pan head. This provides a much larger bearing surface, similar to using a built-in washer, which is why these are sometimes called "wafer head" screws.
🛒 Select your Size and Quantity above, then add to cart.
