Combination Small Pan Head Screw with Spring Washer and Square Washer Assembly – Product Introduction

This is a standardized fastening assembly that comes with three parts pre-assembled together and will not fall apart. The screw head is simultaneously milled with both a Phillips recess and a slotted recess, allowing operation with a variety of tools. The small pan head design features a reduced head diameter and height, resulting in a low-profile and smooth appearance after installation. The spring washer provides anti-loosening locking force, while the square washer is specifically designed for grooved holes or situations requiring rotation prevention. The entire assembly is formed at the factory, with materials automatically matched according to the screw strength class.

I. Product Features

Composite Drive Head: The head features both a Phillips recess and a slotted recess, offering excellent versatility and allowing tightening with Phillips screwdrivers, flat-head screwdrivers, or power tools.

Compact Low-Profile Small Pan Head: The head diameter and height are both smaller than a standard pan head, making it suitable for applications with limited installation space or requirements for a flush appearance.

Square Washer Anti-Rotation: The washer has a square outer profile that can engage with grooved holes, guide rail slots, or square holes, preventing the washer from rotating during tightening and enabling more efficient installation.

Anti-Loosening and Missing-Part Prevention: The spring washer and square washer are pre-assembled and cannot be removed, eliminating the possibility of missing washers on-site by design.

Grade-Matched Materials: The material and hardness of the screw, spring washer, and square washer are automatically matched according to national standard requirements, ensuring unified connection strength and anti-loosening performance.

II. Product Advantages

Easy Assembly: Pick up and install with one hand directly into the hole, with no need for sorting, arranging, or threading washers, making it especially suitable for fast-paced production lines.

Compatible with Groove and Rail Structures: The square washer can be directly inserted into profile slots or elongated sheet metal holes, enabling single-sided screw tightening without requiring a wrench to hold the nut in place.

Neat Appearance: The combination of a small pan head and a regular square washer creates a clean and tidy visual look, often used for equipment enclosures or panels with appearance requirements.

Workpiece Surface Protection: The square washer increases the contact pressure area, effectively distributing the screw head pressure and preventing indentations on rail surfaces or soft materials.

Simplified Material Management: One part number manages three components, saving effort in procurement, inventory, and parts issuing.

III. Applications

Suitable for applications requiring fast assembly, anti-loosening performance, and installation on grooved holes or rotation-prevention structures. Common areas include:

Aluminum Profile Frames and Rails: Fastening of accessories on industrial aluminum profile T-slots or V-slots, such as sensor brackets and baffle connections.

Electrical Cabinets and Distribution Systems: Bus bar installation in switchgear cabinets and fastening of components on slot rails.

Sheet Metal Enclosures and Chassis: Cabinet frames and cover connections; the square washer can position and prevent rotation within elongated holes.

Automotive and Rail Transit Interiors: Fastening of interior panels and inspection hatch covers on grooved hole positions.

Furniture and Display Equipment: Positions in shelving, display racks, and office furniture that require adjustable or blind-end connections.