Phillips Pan Washer Head Screw Technical Datasheet
Phillips Pan Washer Head Screws (W/W screw) combine a standard pan head with an integral washer flange, providing a larger bearing surface than conventional pan head screws. The integrated washer distributes the clamping load over a wider area, reducing the risk of surface damage, preventing pull-through on softer materials, and improving joint stability without requiring a separate washer.
These screws are widely used in sheet metal fabrication, electrical enclosures, HVAC equipment, automotive assemblies, electronics, appliances, telecommunications equipment, and general industrial manufacturing where improved load distribution and faster assembly are required.
Table of Contents
ITEM CODE: 1051
Standard
Manufacturers Standard
Dimensions
| d | M3 | M4 | M5 | M6 |
|---|---|---|---|---|
| dk | 5.5 | 7 | 9 | 10.5 |
| dc | 8 | 10 | 12 | 13 |
| k | 2.2 | 3 | 3.5 | 4.2 |
| t | 0.5 | 0.8 | 1 | 1 |
| m | 3.6 | 4.2 | 4.9 | 6.3 |
all dimensions in mm
Dimensions Tolerances:
General dimensional tolerances for standard metric fasteners—including thread diameter, overall length, head diameter, head height/thickness, across flats, and washer dimensions—are available in our Standard Dimensional Tolerances for Common Metric Fasteners guide.
Certain product-specific features, such as drive recess dimensions, socket depth, countersink geometry, under-head radii, and other special characteristics, are governed by the applicable DIN or ISO product standard and may not included in this datasheet.
Download Technical Datasheets
Stainless Steel
| Grade | Download |
|---|---|
| A2-70 (SS304) | ⬇️ Download Datasheet |
| A4-70 (SS316) | ⬇️ Download Datasheet |
Mechanical Properties
| Material / Property Class | Tensile Strength | Yield Strength | Standard |
|---|---|---|---|
| Steel 4.8 | ≥ 400 MPa | ≥ 320 MPa | ISO 898-1 |
| Steel 5.8 | ≥ 500 MPa | ≥ 400 MPa | ISO 898-1 |
| Steel 8.8 | ≥ 800 MPa | ≥ 640 MPa | ISO 898-1 |
| Stainless Steel A2-50 | ≥ 500 MPa | — | ISO 3506-1 |
| Stainless Steel A2-70 | ≥ 700 MPa | ≥ 450 MPa | ISO 3506-1 |
| Stainless Steel A4-70 | ≥ 700 MPa | ≥ 450 MPa | ISO 3506-1 |
| Titanium Grade 2 | Approx. 345 MPa | Approx. 275 MPa | ASTM B348 |
| Titanium Grade 5 | Approx. 895 MPa | Approx. 828 MPa | ASTM B348 |
Material Characteristics and Recommended Applications
| Material | Characteristics | Typical Applications |
|---|---|---|
| Steel Class 4.8 | General-purpose fastening | Electrical assemblies, furniture |
| Steel Class 8.8 | Higher tensile strength | Industrial machinery |
| Stainless Steel A2 (304) | Excellent corrosion resistance | Food processing, HVAC, electrical panels |
| Stainless Steel A4 (316) | Superior corrosion resistance | Marine, offshore, chemical plants |
| Brass | Non-magnetic, decorative, conductive | Electrical equipment, instrumentation |
| Titanium Grade 2 | Lightweight, corrosion resistant | Aerospace, medical equipment |
| Titanium Grade 5 | High strength-to-weight ratio | Aerospace, motorsports, high-performance engineering |
Technical Specifications
| Property | Specification |
|---|---|
| Product Type | Phillips Pan Washer Head Machine Screw |
| Head Style | Pan Washer Head |
| Drive Type | Phillips Cross Recess |
| Thread Type | Metric Coarse |
| Thread Direction | Right Hand |
| Thread Form | Machine Thread |
| Standard | Manufacturer Standard / JIS |
| Sizes | M3 – M6 |
| Length Range | 4 mm – 50 mm |
| Finish Options | Plain, Zinc Plated, Yellow Zinc, Nickel, Black Oxide, Geomet, Dacromet, Passivated |
| Strength Classes (Steel) | 4.8, 8.8, 10.9 |
| Stainless Grades | A2-50, A2-70, A4-70, A4-80 |
| Thread Tolerance | 6g |
| Head Drive | Phillips PH1 / PH2 / PH3 depending on size |
| Washer Type | Integral Flange |
| Temperature Range | Depends on material |
Applications
- Automotive manufacturing
- Electric vehicles
- Electronics assembly
- Data centres
- Telecom equipment
- Industrial machinery
- Robotics
- Medical equipment
- Consumer appliances
- HVAC systems
- Electrical panels
- Automation equipment
- Renewable energy equipment
Advantages
- Large integrated washer distributes clamping load.
- Eliminates the need for a separate flat washer in many applications.
- Reduces damage to softer materials.
- Phillips drive enables quick installation with common tools.
- Attractive finished appearance.
- Suitable for automated assembly lines.
- Available in multiple materials and finishes.
- Excellent vibration resistance when used with locking washers or thread-locking compounds.
- Good for oversized holes due to increased bearing surface.
- Cost-effective fastening solution.
Frequently Asked Questions
What is a Phillips Pan Washer Head Screw?
It is a machine screw with a Phillips cross recess and an integral washer flange that increases the bearing surface under the head.
What is the benefit of the washer head?
The built-in washer spreads the clamping load over a larger area, reducing the chance of damaging the workpiece and often eliminating the need for a separate washer.
Is there a DIN or ISO standard for Pan Washer Head Screws?
There is no direct DIN or ISO equivalent. Most Pan Washer Head Screws are manufactured to manufacturer standards or JIS specifications, although thread dimensions generally follow ISO metric standards.
Are the screws fully threaded?
Yes. the screws are supplied with full metric threads.
Which screwdriver should be used?
A correctly sized Phillips screwdriver or bit (PH1, PH2, or PH3 depending on screw size) should be used to prevent cam-out and damage to the recess.
Are stainless steel versions available?
Yes. They are commonly available in A2 (304) and A4 (316) stainless steel.
Can these screws replace a flat washer?
In many applications, yes. The integral washer flange provides a larger bearing surface than a standard pan head, reducing or eliminating the need for a separate flat washer.
Need Technical Assistance or a Quote?
Looking for pricing, samples, CAD drawings, or help selecting the right fastener? Our team can help you choose the correct product for your application.
📧 sales@horizonincindia.com | 📞 +91 80 4117 9152 | 💬 +91 99167 77262
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- Fastener Nomenclature
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- DIN & ISO Standards Guide
- Standard Dimensional Tolerances
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