Technical Foundation
What Is a Spring Assortment?
A spring assortment is a pre-organized kit containing multiple springs of one or more types (compression, extension, torsion) across a graduated range of wire diameters, free lengths, and spring rates, packed in a labeled compartment box for general maintenance stock. Kits let a maintenance department cover a wide range of light-duty repair needs — replacing a broken spring in a latch, switch, or fixture — without special-ordering a single spring against an exact print and waiting on lead time.
Compression springs resist a compressive (pushing) load and are would with the coil under some initial tension so they return to free length when unloaded; extension springs are wound with initial tension so they resist being pulled apart and typically terminate in hooks or loops; torsion springs resist a twisting load about their axis and terminate in straight or bent legs rather than hooks. Kit springs are general-purpose music wire or stainless steel, adequate for light mechanical and electrical assembly use but not a substitute for an engineered spring where a precise spring rate, fatigue life, or corrosion-specific material is required.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Spring Type | Compression, extension, torsion | Each resists a different load direction and cannot be substituted for one another |
| Wire Diameter Range | Typically 0.015 in.–0.080 in. across a kit | Sets the load range the kit can cover; finer wire suits light-duty repairs only |
| Material | Music wire (carbon steel), 302/304 stainless steel | Stainless variants needed for outdoor, washdown or corrosive-exposure repairs |
| Kit Organization | Compartmented box, labeled by size | Speeds identification of a replacement spring against a broken sample |
| Spring Rate | Not individually specified in general kits | General kits are for light-duty repair, not precision or fatigue-rated applications |
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Applications
Where Spring Assortments Get Used
Spring assortment kits are stocked wherever a maintenance or repair operation needs to cover a wide range of light-duty spring failures without special-ordering individual parts.
General Facility Maintenance
Compartmented kits stocked in maintenance shops to replace broken springs in latches, switches, and fixtures on demand.
Machine Shop & Fabrication
Assortment kits used for quick prototyping and light repair of jigs, fixtures, and tooling.
Automotive & Small Engine Repair
Extension and compression kits covering common carburetor, linkage, and small mechanism spring replacements.
Electronics & Appliance Repair
Fine-wire compression and torsion springs from kits used in switch, relay, and small mechanism repair.
Toolroom & Die Maintenance
Die spring assortments stocked for quick replacement in stamping and molding tooling.
FAQ
Spring Assortments Questions, Answered
What's the difference between a compression, extension and torsion spring?
A compression spring resists being pushed together and pushes back outward — used wherever something needs to be held apart or return after being pressed. An extension spring resists being pulled apart and pulls back inward, usually terminating in hooks that attach to two moving parts. A torsion spring resists a twisting or rotational force and stores energy in a twist rather than a push or pull, terminating in straight or bent legs instead of hooks.
Are kit springs suitable for load-critical or fatigue-critical applications?
No — general assortment kits are intended for light-duty maintenance and repair where an exact spring rate isn't critical, not for applications with tight load tolerances, high cycle counts, or specific fatigue life requirements. For those, an engineered spring built to a specific rate, material and finish should be sourced against a print.
How do I identify the right replacement spring from a broken sample?
Measure the broken spring's wire diameter, outside diameter, free length, and count the total coils, then compare against the kit's labeled compartments, which are typically organized by these same dimensions. Matching outside diameter and wire diameter closely is most important for fit; free length can sometimes be trimmed to close by cutting and reshaping the end coil for compression springs.
What material should I choose for outdoor or washdown environments?
Standard kits are usually music wire (high-carbon steel), which will rust in wet or washdown environments. Stainless steel spring assortment kits (typically 302 or 304 grade) cost more but resist corrosion for outdoor equipment, food processing, or marine repair applications.
Can die springs from a kit be substituted for general compression springs?
Not generally recommended — die springs are engineered specifically for high-cycle fatigue life in stamping and molding tooling and are color-coded by load rating (light, medium, heavy, extra-heavy) rather than by physical dimension alone. A die spring assortment should be used for tooling repair; general compression spring kits are better suited to non-tooling mechanical repairs.
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