๐ฉ Product Overview: Big Pan Head Phillips Machine Screws โ A2 & A4 Stainless Steel (M2 to M6)
Whether you're assembling marine equipment, chemical plant components, or outdoor furniture, the right fastener makes all the difference. These big pan head Phillips machine screws are available in both A2 (304) and A4 (316) stainless steel โ giving you the choice between excellent generalโpurpose corrosion resistance (A2) or superior protection against saltwater and harsh chemicals (A4). The oversized pan head provides a larger bearing surface, distributing clamping force evenly without the need for a separate washer. Fully threaded with standard coarse metric pitch (M2 to M6), they offer maximum grip in thin materials. Ideal for seawater equipment, dyeing machinery, paper mills, chemical plants, and any demanding environment where ordinary screws would rust or fail.
โจ Why Choose These Big Pan Head Stainless Steel Screws
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Choose your grade โ A2 or A4 stainless steel โ A2 (304) offers excellent corrosion, oxidation, and heat resistance for most indoor/outdoor uses. A4 (316) adds molybdenum for superior resistance to saltwater and industrial chemicals.
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Big pan head design โ Extraโlarge head diameter provides a wide clamping surface. Eliminates the need for a flat washer in many applications โ saves time and parts.
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Phillips drive for easy installation โ Standard cross recess works with common #1, #2, or #3 bits. Quick and secure driving.
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Metric sizes M2 to M6 โ Covers the most common smallโtoโmedium diameters for electronics, machinery, furniture, and industrial equipment.
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Fully threaded, coarse pitch โ Threads run the entire shank length. Standard pitches: M2x0.4, M2.5x0.45, M3x0.5, M4x0.7, M5x0.8, M6x1.0.
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High strength and toughness โ Stainless steel provides good mechanical properties for longโterm reliability under load and vibration.
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Wide application range โ Seawater equipment, chemical plants, dyeing, paper industry, food processing, marine hardware, and general construction.
๐ Technical Specifications โ Big Pan Head Phillips Screws (M2โM6)
| Specification |
Details |
| Product Type |
Phillips Big Pan Head Machine Screws (Oversized head) |
| Material Options |
A2 Stainless Steel (304) or A4 Stainless Steel (316) โ select when ordering |
| Drive Style |
Phillips crossโhead |
| Head Style |
Big pan head (large diameter, flat bearing surface) |
| System of Measurement |
Metric |
| Thread Sizes (Diameter) |
M2, M2.5, M3, M4, M5, M6 |
Thread Pitches (coarse) |
M2x0.4, M2.5x0.45, M3x0.5, M4x0.7, M5x0.8, M6x1.0
|
| Thread Type |
Fully threaded |
| Length Measurement |
Under head (from flat bearing surface to tip โ head not included) |
| Finish |
Natural stainless (unplated) |
| Typical Applications |
Seawater equipment, chemical plants, dyeing, paper industry, marine hardware, food processing |
๐ A2 vs A4 Stainless Steel โ Which One Do You Need?
| Property |
A2 (304) Stainless |
A4 (316) Stainless |
| Corrosion Resistance |
Good โ resists humidity, rain, mild chemicals |
Excellent โ resists saltwater, chlorides, strong acids |
| Typical Use |
Indoor/outdoor furniture, appliances, light marine |
Marine hardware, coastal construction, chemical equipment |
| Cost |
More economical |
Higher โ premium grade |
| Best For |
General purpose, dry environments |
Saltwater, chemical exposure, longโterm outdoor |
โ FAQs โ Big Pan Head Stainless Steel Screws
๐ธ What makes the โbig pan headโ different from a standard pan head screw?
A big pan head has a larger outer diameter than a standard pan head. This provides a wider clamping surface, distributes force more evenly, and often eliminates the need for a separate flat washer. It also offers increased pullโthrough resistance in soft materials like plastic or wood.
๐ธ When should I choose A4 (316) stainless over A2 (304)?
Choose A4 (316) when your application involves direct saltwater exposure (marine, coastal), high chloride levels (swimming pools, deโicing salts), or aggressive chemicals. A2 (304) is sufficient for most indoor, outdoor, and humid environments that are not constantly exposed to salt or strong acids.
๐ธ Are these screws fully threaded? How is length measured?
Yes โ all screws are fully threaded from just under the head to the tip. Length is measured from the underside of the head (the flat bearing surface) to the tip, not including the pan head. For example, an M5 x 20mm screw has a 20mm threaded shank.
๐ธ What Phillips screwdriver size should I use for M2 through M6?
M2โM2.5: use PH0 or PH00. M3โM4: use PH1. M5โM6: use PH2. Using the correct size prevents stripping and ensures proper torque transfer.
๐ธ Can I use these screws with nuts, or are they selfโtapping?
These are standard machine screws โ they require a matching metric nut (M2โM6) or a preโtapped hole. They are not selfโtapping. For best corrosion resistance, pair with stainless nuts of the same grade (A2 with A2, A4 with A4).
๐ธ What lengths are available?
Lengths vary by diameter. Typical ranges: M2โM3: 3โ20mm; M4: 4โ40mm; M5โM6: 6โ60mm. Please select your desired length from the dropdown options. If you need a length not listed, contact us โ we may be able to source it.
