Blackened Steel Compression Springs Coils

Blackened Steel Compression Springs Coils

This blackened steel compression spring coil is engineered for demanding mechanical applications that require durability, consistent performance, and resistance to wear. With a free length of 90 mm, a wire diameter of 4.5 mm, and an outer diameter (OD) of 38 mm, this coil is ideal where strong restoring force, stability under load, and compact compression are needed. The blackened finish reduces surface reflection, provides a measure of corrosion resistance, and offers a subdued, industrial aesthetic.

Whether you’re designing suspension systems, load-bearing assemblies, or heavy-duty equipment requiring precise spring behavior, this spring delivers reliable tensile-compression cycles. Its material hardness and coil construction ensure minimal deformation over repeated use, strong spring rate, and resistance to fatigue. For engineers and DIY enthusiasts alike requiring a spring with both strength and consistency, this coil fits sizes from 6 mm up to 100 mm in active length, offering flexibility across many use-case ranges.

Features

• Free length 90 mm ± tolerance
• Wire diameter 4.5 mm solid steel
• Outer diameter 38 mm for strong coil stability
• Blackened finish suppresses glare & corrosion
• Load-bearing, fatigue resistant design

Specification

• Brand: Hardware Specialist
• Product Type: Spring Coil
• Length: 90 mm
• Wire Diameter: 4.5 mm
• Outer Diameter (OD): 38 mm
• Material: High carbon/steel spring grade
• Operating length range (Drill Size): 6 mm to 100 mm
• Recommended load cycles: Repeated compression with high fatigue life