High quality general purpose extension springs come in a wide range of lengths and load capacities ideally suited for OEM applications, equipment maintenance, as well as numerous industrial projects. Offered in commonly requested incremental sizes and spring rates time proven over 100 years, Utility Extension Springs are handy as replacement parts in numerous non-critical environments or anywhere light to medium duty springs are needed. Wide variety of sizes in zinc plated Carbon Steel and 302 Stainless Steel. Ends are crossover center on wire sizes below 0.072 inches. Ends on wire sizes 0.072 and above may be machine hooks. Custom sizes and materials are also available. Parts are conveniently packaged in easily managed, cost-effective and space-efficient units. Bulk pricing provides significant savings on large orders of a given part.Ends are full twist loops. Loop OD is the same as body OD. Ultra-Precision Extension Springs have an excellent fatigue life and are ideal for dynamic or heavy cycle applications. Other uses include maintenance, prototyping, and equipment repair. All parts are stress-relieved.