PULL SPRING

A PULL SPRING, also known as an extension spring or tension spring, is typically made of tightly wound helical coils with hooks at both ends. When subjected to tensile force, the spring extends and stores mechanical energy. Once the external force is removed, it generates a restoring force, making it suitable for pulling back, returning components to position, maintaining tension, and connecting parts.

Product Name: PULL SPRING / Extension Spring / Tension Spring
Product Structure: Cylindrical helical coil with hooks at both ends
Primary Dimensions: Wire diameter, outside diameter, inside diameter, body length, and overall length
Coil Configuration: Total number of coils and active coils designed according to tensile load requirements
Initial Tension: Determined according to operating load, travel, and return-force requirements
Hook Types: Full loop, half loop, side hook, double hook, or other special hook designs
Hook Orientation: Same direction, opposite direction, perpendicular, or as specified by drawing
Winding Direction: Right-hand, left-hand, or as specified
Materials: Music wire, oil-tempered wire, stainless steel wire, or alloy steel wire
Heat Treatment: Low-temperature tempering, stress relieving, or other treatments according to material requirements
Surface Treatments: Zinc plating, nickel plating, black oxide, passivation, or electrodeposition coating
Production Options: Standard specifications, sample development, or custom production based on drawings
Inspection Items: Dimensions, tensile force, initial tension, travel, and appearance

Provides Stable Restoring Tension

After being extended, a PULL SPRING generates an opposing tensile force that helps return the mechanism to its original position, making it suitable for covers, pull rods, linkages, and other moving components.

Initial Tension Can Be Customized

The coils are generally wound closely together. Initial tension and working load can be adjusted through wire diameter, number of coils, and forming methods to meet different application requirements.

Multiple Hook Designs Available

The hooks at both ends can be manufactured in different angles, lengths, and shapes to accommodate holes, pins, shafts, or other connecting components.

Suitable for Different Extension Travel

Free length, maximum extension, and spring rate can be designed according to equipment travel requirements, allowing the spring to meet return-force or tension-maintenance needs.

Wide Range of Applications

PULL SPRINGS are commonly used in machinery, automotive and motorcycle components, home appliances, electronic products, fitness equipment, door locks, toys, and automation equipment.