Overview

Hexagonal flat end set screws are headless fasteners designed to be driven entirely into a tapped hole. Their primary function is to secure one component relative to another without protruding above the surface. The “flat end” design means the end of the screw is flat and smooth, making it ideal for applications where the screw needs to press against a mating surface without marring it, or in scenarios where it pushes against a detent or other flat part. Manufactured from either stainless steel (SS304/SS316) or carbon steel, they offer varying degrees of strength and corrosion resistance.

Definition

A Hexagonal Flat End Set Screw is a headless screw with internal hexagonal drive (Allen key) for tightening, and a flat end point. It is designed to be threaded through one part and apply pressure against a mating surface of another part to prevent relative motion, without piercing or indenting the surface. Available in stainless steel (SS304/SS316) for corrosion resistance or hardened carbon steel for maximum strength, these screws are entirely concealed within the assembly once installed.

Key Features

• Headless Design: Allows for flush or recessed installation, providing a clean appearance and preventing snagging.
• Internal Hex Drive: Utilizes an Allen key for precise and secure tightening, offering good torque transmission.
• Flat End Point: Designed to press against a flat surface without causing damage, suitable for delicate components or against a detent.
• Material Options:
  • Stainless Steel (SS304/SS316): Offers excellent corrosion resistance, making them suitable for outdoor, marine, or chemically exposed environments. SS316 provides superior resistance to chlorides.
  • Carbon Steel: Typically heat-treated and often black oxide or zinc plated, providing high tensile strength for robust mechanical applications.
• Full Thread: Usually fully threaded for maximum engagement within the tapped hole.

Applications

• Shaft Collars and Hubs: Used to secure collars, pulleys, gears, and sprockets to shafts, preventing axial or rotational movement.
• Machine Adjustments: Ideal for making precise adjustments in machinery, acting as a stop or to position components.
• Fixturing and Clamping: Employed in jigs and fixtures where a non-marring, flush clamping force is required.
• Tooling: Used in tool holders and other tooling components to secure inserts or parts.
• Door Handles and Knobs: Commonly used to secure handles and knobs to their spindles.
• Bearing Retention: Can be used to retain bearings in certain applications where they press against the outer race.

Advantages

• Non-Marring Engagement: The flat end is ideal for surfaces that should not be damaged, such as polished shafts or soft materials.
• Flush Installation: The headless design allows for installations where the fastener is completely recessed, contributing to a compact and aesthetically pleasing design.
• Strong Holding Power: Provides a secure and reliable hold, especially when the mating part has a flat surface for the screw to press against.
• Corrosion Resistance (Stainless Steel): Stainless steel versions are highly resistant to rust and chemicals, extending the life of the assembly in challenging environments.
• High Strength (Carbon Steel): Heat-treated carbon steel versions offer superior strength for demanding mechanical applications.
• Reduced Protrusion: Minimizes interference with other components and improves safety by eliminating protruding heads.