Spade Head Thumb Screws With Shoulder

Spade Head Thumb Screws with Shoulder are hand-tightening fasteners with a flat, shovel-shaped (single-wing) head and a precision stepped shoulder. They are primarily designed for installation scenarios with limited internal space in relays, contactors, and circuit breakers, ensuring a smooth surface after tightening and preventing interference with adjacent electronic components.

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Products Description

Spade Head Thumb Screws with Shoulder are hand-tightening fasteners with a shoulder-shaped positioning structure and a flat, forked head. They are primarily used in precision equipment where space is limited and quick assembly/disassembly is required. Their core function is to achieve stable locking without tools, ensuring even force distribution. They are commonly used for securing internal structures in relays, switching assemblies, and electrical control modules. This type of screw significantly reduces the risk of interference in compact assembly spaces while improving assembly repeatability.

Key Selling Points

Shoulder Stop Structure: The shoulder diameter and height of the Flat Head Hand Switch Screws are precisely calculated to create a hard stop when tightened to the designed torque, preventing thread stripping or base deformation due to over-tightening, ensuring long-term assembly reliability.

Preservation of Cold-Forged Metal Streamlines: The Spade Head Thumb Screw utilizes multi-station cold forging, ensuring continuous flowlines within the metal along the part's contour without cutting interruptions. This results in approximately 30% higher shear strength compared to machined parts, making it suitable for high-frequency vibration environments.

Ergonomically Optimized Shovel-Shaped Head: The Single Wing Thumb Screw's head thickness and curvature are ergonomically validated, allowing for sufficient torque application with one or two fingers. Operating torque is controlled within the range of 0.5-2.5 N·m, balancing tightening force with operational comfort.

Spade Head Thumb Screw

Technical Advantages

Optimized Head Stress

The spade-shaped head of the Thumb Screw with a Flat Spade Head features mechanically optimized stress surfaces, ensuring even force application during manual tightening and preventing head deformation or slippage.

Thread Precision Control

Shoulder Spade Thumb Screws employ thread rolling technology, resulting in regular tooth profiles, stable clearances, and adaptability to mounting holes with varying tolerances.

Shoulder Coaxiality Control

The coaxiality deviation between the shoulder and the screw is controlled within the industry standard range, ensuring that the screw is not misaligned and the force is evenly distributed after installation.

Surface treatment process

Blackening treatment forms a dense oxide layer, improving the surface hardness and corrosion resistance of the Fine Thread Thumb Screw, and reducing wear and rust during long-term use.

Cold Heading Production Process Of Spade Head Thumb Screws With Shoulder

Application Scenarios

Relay Internal Assembly

Suitable for fixing terminals or housings in confined spaces inside relays, allowing for tool-free assembly and disassembly.

Switchgear Housing Fixing

Spade-head Thumb Screws are used for assembling housings of small switchgear; the shoulder structure prevents over-tightening from damaging the plastic housing.

Contactor Maintenance Accessories

Flat Head Hand Switch Screws serve as fixing screws for easily removable parts of contactors, facilitating quick disassembly and assembly during later maintenance.

Petrochemical Solutions

Spade-head Thumb Screws are suitable for installing auxiliary components inside circuit breakers, meeting assembly requirements in confined spaces.

Spade Head Thumb Screws With Shoulder Application Scenarios

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We welcome purchasing engineers and project teams to contact us to obtain samples and bulk quotations for Spade Head Thumb Screws with Shoulder. We support long-term cooperation with global industrial customers.

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