If you are shopping for fasteners and springs for industrial hardware, the first fork in the road is whether you need many small sizes or one long coil. A compact assortment kit can cover quick fixes, while a 305mm spring is built for a single extended application. The four options here range from a 390-piece stainless steel kit at USD 9.16 to a black 305mm spring steel coil at USD 158.88, so the right pick depends on the scale and color of your project.
Quick Take
The 390pc Compression Spring Assortment Kit gives you 28 sizes and 390 pieces in stainless steel for USD 9.16, making it the lowest-priced option in this group. If you need a specific small spring in quantity, the 0.8mm Wire Compression Spring shows a 100-pack of galvanized steel springs with a 9mm diameter and 100mm length at USD 74.18. For longer reach, both the Length 305mm Compression Spring and the Black Compression Spring are open-end spring steel coils; the non-black version is USD 94.20 and the black version is USD 158.88.
Listed Price Comparison
| Product | Listed Price | Price Bar | Key Detail |
|---|---|---|---|
| 390pc Compression Spring Assortment Kit 28 Sizes Stainless Steel Small Springs | USD 9.16 | 390 pieces, 28 sizes, stainless steel | |
| 0.8mm Wire Compression Spring 7-11mm Diameter & 10-100mm Length Pressure Small | USD 74.18 | 100-pack, galvanized steel, 9mm diameter | |
| Length 305mm Compression Spring Pressure Springs OD 3-50 mm Wire Dia 0.3mm-6.0mm | USD 94.20 | 305mm length, open ends, 40mm outer diameter | |
| Black Compression Spring 0.3mm-6mm Wire Diameter 305mm Length Springs Steel | USD 158.88 | 305mm length, black, open ends |
Decision Matrix
| Use Case | Recommended Option | Why It Fits |
|---|---|---|
| A range of small springs for repairs and prototypes | 390pc Compression Spring Assortment Kit | 390 pieces across 28 sizes in stainless steel |
| A batch of small identical springs | 0.8mm Wire Compression Spring | 100-pack in galvanized steel with a 9mm diameter |
| A long 305mm open-end spring for industrial and hobby projects | Length 305mm Compression Spring | 305mm length, 40mm outer diameter, open ends |
| A long black spring steel coil | Black Compression Spring | 305mm length, black finish, open ends |
Product Notes
0.8mm Wire Compression Spring 7-11mm Diameter & 10-100mm Length Pressure Small
If you need a batch of small identical springs, this 100-pack is worth a close look. The dimensions are a 0.8mm wire diameter, a 9mm diameter, and a 100mm length, with a galvanized finish. That makes it easy to match a specific repair or small assembly. The tradeoff is that you are getting one size only. If your project calls for several diameters or shorter lengths, a multi-size kit would be more flexible.
Black Compression Spring 0.3mm-6mm Wire Diameter 305mm Length Springs Steel
This is the only black option and one of two 305mm coils in the group. It is a 305mm spring steel coil with open ends and a wire diameter range of 0.3mm to 6mm. The black finish sets it apart from the other 305mm spring, so if color matters for your project, this is the one to pick. The tradeoff is that the dark finish is a specific aesthetic choice. If the spring will be hidden inside an assembly, the plain 305mm option gives the same length in a more neutral surface.
Length 305mm Compression Spring Pressure Springs OD 3-50 mm Wire Dia 0.3mm-6.0mm
At 305mm with open ends and an outer diameter of 40mm, this spring is positioned for larger projects. It suits tractors, agriculture, industry, metal construction, vintage cars, house, yard, hobby, car, and model making, giving it a broad application range. The limiting factor is that it is a single long coil rather than a multi-size kit, so you need to be sure 305mm is the length you actually need.
390pc Compression Spring Assortment Kit 28 Sizes Stainless Steel Small Springs
This assortment kit packs 390 pieces across 28 sizes in stainless steel. If you are repairing small devices or building prototypes, having that many options on hand can save a separate order for each size. The springs are small, with an item diameter range of 2 to 8 millimeters, so they are not a substitute for the 305mm coil options. Choose this kit when variety matters more than a single long spring.
Final Recommendation by Use Case
For a collection of spare small springs, go with the 390pc Assortment Kit. For a clean batch of one specific small size, pick the 0.8mm Wire Compression Spring. For a long 305mm coil in plain spring steel, the Length 305mm Compression Spring is the direct option. Choose the Black Compression Spring only when the dark finish is part of your requirement.
