3-8 Outer Diameter
3/8" (0.375) Inch Outer Diameter Standard Extension Springs
Definition of 3/8" Outer Diameter Extension Springs:
A 3/8" (three eighths of an inch) outer diameter extension spring has an outer diameter of 0.375 inches. These springs are commonly used in medium to heavy-duty tension applications where strength and reliable extension are key. Ideal for automotive, industrial, hardware, and mechanical uses, 3/8" OD springs deliver performance in compact yet powerful formats.
At The Spring Store by Acxess Spring, we offer a wide variety of 3/8" OD extension springs with different hook types, wire sizes, and tension ratings to match your exact specifications.
How To Measure Your 3/8" Inner Diameter Stock Extension Spring
Your 3/8" (three eighths of an inch) extension spring’s outer diameter is a critical factor in determining how the spring performs under load and how well it fits within your design. A 3/8" OD extension spring delivers strong pulling force while maintaining a manageable size, perfect for tension-based mechanisms that require durability.
The 3/8" (0.375) OD extension springs in our catalog come in multiple configurations — wire diameter, total coils, body length, hook style — allowing you to fine-tune the spring’s strength and flexibility.
All our stock 3/8" OD extension springs are crafted from high-quality materials such as 302 stainless steel (ASTM A 313) and music wire (ASTM A 228), ensuring strength, flexibility, and corrosion resistance.
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Price Part Number Image Ship typeOutside Diameter
Ship type
Inside Diameter
Outside Diameter
Free Length
Inside Diameter
Rate
Free Length
Max. Deflection
Spring rate or spring constant: The amout of force required to move the spring 1 inch of distance or in millimeters the amount of force required to move the spring 1 millimeter of distance.
Max. Load
Max. Deflection
Solid Height
The maximum amount of force or load you can place on this spring. If you put more force than this you will distort or fatigue the spring.
Wire Diameter
Solid Height
Total Coils
Wire Diameter
Material Type
Total Coils
End Type
Material Type
End Type
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