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When a worn or undersized spring causes your injection mold or stamping die to misfire, the cost in downtime and scrap adds up fast. Toolmakers, mold designers, and maintenance engineers who need a dependable, dimensionally consistent compression spring will find this TF-series blue spring engineered to deliver repeatable force cycle after cycle.
Each spring features an outer diameter (OD) of 27 mm (~1.06 in) and an inner diameter (ID) of 13.5 mm (~0.53 in), with available lengths ranging from 25 mm to 300 mm (~0.98 in to ~11.81 in). The blue color coding follows the standard TF light-load classification, making identification quick on a busy shop floor. Springs are wound from high-grade alloy steel wire with a consistent pitch and uniform coil spacing.
Typical use cases include injection mold stripper plates requiring controlled return force, progressive stamping die lifters needing consistent stroke, and industrial fixture clamping mechanisms where space is constrained. Long-tail search terms that describe this product: "OD 27mm blue die spring replacement," "TF series light-load mold spring 27mm," and "compression spring for injection mold stripper plate."
| Series / Color Code | TF Blue (Light Load) |
|---|---|
| Outer Diameter (OD) | 27 mm (approx. 1.06 in) |
| Inner Diameter (ID) | 13.5 mm (approx. 0.53 in) |
| Available Free Lengths | 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 90, 100, 125, 150, 175, 200, 250, 300 mm |
| Material | High-tensile alloy steel |
| Surface Finish | See variant options |
| Load Class | Light (TF / Blue) |
| Max Deflection Rate | See variant options |
| Wire Diameter | See variant options |
| Quantity per Pack | 1 / 2 / 3 / 4 / 5 / 6 pcs (select variant) |
| Application | Injection molds, stamping dies, industrial fixtures |
Measure the depth of your spring pocket and the required stroke (deflection). A common rule of thumb is to select a free length that is approximately 2–3× the required deflection to keep the spring within its safe working range. For example, if you need 15 mm of stroke, a 40–50 mm free length is a reasonable starting point. Always confirm with your mold design specifications.
The TF color coding system classifies compression mold springs by load rating. Blue indicates a light-load spring, which provides lower force per unit deflection compared to heavier-rated colors (e.g., green, yellow, red). Use blue springs where lower return force is needed to avoid distorting delicate mold components or thin-walled parts.
Yes — the OD of 27 mm is designed to seat in a standard 27 mm pocket. The ID of 13.5 mm accommodates guide pins up to approximately 13 mm in diameter. Always verify your pocket diameter and guide pin size before installation to ensure a proper fit without binding.
These springs are manufactured from high-tensile alloy steel. For standard indoor mold and die environments they perform reliably. If your application involves exposure to coolants, cutting fluids, or high humidity, consider applying a light coat of machine oil during storage and periodically during use to extend service life.
Yes. Because these springs share consistent OD, ID, and pitch specifications within the same length, they are well-suited for multi-spring balanced layouts. Using matched springs from the same batch minimizes force variation across the stripper plate or ejector system, helping to prevent uneven ejection or plate tilt.
This depends on your mold design. Small single-cavity molds may use 4–8 springs, while larger multi-cavity or progressive dies can require 12 or more. The variant selector lets you choose packs of 1 to 6 pieces. For larger quantities, ordering multiple packs of the same variant is straightforward. Having 1–2 spare springs on hand is recommended for quick maintenance turnaround.
Longer springs provide greater total deflection capacity and are used in deeper mold pockets or applications requiring longer strokes. Shorter springs are used in compact mold sections with limited pocket depth. The spring rate (force per mm of deflection) varies with length — longer springs of the same OD and wire diameter are generally softer (lower force per mm). Select the length that matches your pocket depth and required stroke.
