Product Overview
The Phillips Countersunk Head Screw is a versatile fastener designed to sit flush with or below the material surface, creating a smooth, unobstructed finish. Driven by a Phillips cross-recess drive (PH), it is optimized for efficient manual or powered assembly in applications where aesthetics, safety (no protruding heads), and streamlined production are key considerations. Widely used in electronics, furniture, sheet metal, and general manufacturing.
Key Advantages
Flush Finish: The 82° or 90° countersunk head allows for a smooth surface, eliminating snag points.
High-Speed Assembly: The Phillips drive facilitates rapid engagement with power drivers, boosting production efficiency.
Cost-Effective: A highly economical choice for high-volume manufacturing.
Wide Driver Compatibility: Phillips screwdrivers and bits (PH0, PH1, PH2, PH3) are universally available.
Good Cam-Out Prevention (vs. Slotted): The cross-recess offers better torque transmission and reduced driver slippage compared to slotted heads.
Material Specifications & Strength Grades
| Material Standard | Grade / Class | Typical Tensile Strength (min) | Core Hardness | Characteristics |
|---|---|---|---|---|
| Low Carbon Steel | ASTM A307 / 4.8 | 420 MPa | HRB 70-100 | General purpose, suitable for plating. |
| Medium Carbon Steel | Quenched & Tempered (8.8) | 800 MPa | HRC 22-32 | Good strength for most mechanical applications. |
| Stainless Steel | ASTM F837 / A2-70 | 700 MPa | – | Good corrosion resistance (304). |
| Stainless Steel | ASTM F837 / A4-80 | 800 MPa | – | Superior corrosion resistance (316). |
Product Series & Standards
Standard Series: Compliant with ISO 7046 (Countersunk head, Phillips drive), ASME B18.6.3, and DIN 965.
Head Angle: Standard 82° or 90° included angle.
Drive Sizes: Precision-formed Phillips recess compliant with ISO 8764 (PH Series).
Sizes: Metric: M2 to M10. Imperial: #2 to 1/2″.
Threads: Available in machine screw threads.
Surface Finishes
| Finish Type | Standard / Specification | Key Properties |
|---|---|---|
| Zinc Plated (Blue/Trivalent Clear) | ASTM B633 | Standard corrosion protection (72-96 hrs salt spray). RoHS compliant. |
| Black Oxide | MIL-DTL-13924 | Mild corrosion resistance, reduces glare. |
| Passivation (Stainless Steel) | ASTM A967 | Enhances stainless steel’s corrosion resistance. |
| Electroplated Nickel | ASTM B456 | Good wear & corrosion resistance, decorative. |
| Geomet® Coating (or equivalent) | Proprietary | High-Performance. Dry-lubricated, superior corrosion resistance (>500 hrs). |
Application Notes
Pre-Drilling Required: A matching countersunk pilot hole is essential for proper seating and flush finish.
Torque Limitations: The Phillips drive has lower torque capacity compared to socket drives. Use care to avoid cam-out and recess damage during final tightening.
Ideal For: Sheet metal assembly, electronic enclosures, plastic components, wood-to-metal fastening, furniture, and appliances.
Quality Assurance
Manufactured under ISO 9001:2015 quality management systems. Dimensional checks are performed to ensure head angle, recess depth, and thread conformity. Material certificates are available.
Manufacturing Expertise
Our Phillips Countersunk Screws are produced using precision cold-heading technology, ensuring strong grain flow in the head and shank. Hebei Wohe Fastener Manufacturing Co., Ltd. is a specialized manufacturer focused on producing reliable, volume-driven fastener components for global OEMs in the electronics, general engineering, and furniture sectors.
Availability: Comprehensive range of standard sizes.
Customization: Special lengths, non-standard drives, and unique finishes can be supported.
MOQ: Standard items: from 10,000 pcs. Custom orders: negotiable.
Lead Time: Standard items: 12-18 days.
*The Phillips drive is designed to cam-out at high torque to prevent damage. For applications requiring very high clamp load, a socket drive is recommended. Always match driver bit size (PH1, PH2, etc.) precisely to the screw recess. Specifications are subject to change without notice.
