Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
Engineers and toolmakers working with high-tonnage stamping dies, injection molds, and progressive tooling know the frustration of springs that fatigue prematurely under repeated heavy cycling. These Brown TB compression die springs are engineered specifically for super heavy load applications where consistent return force and long service life are non-negotiable.
Each spring is manufactured from high-grade chromium-silicon alloy steel wire, wound to close tolerances and finished with a brown powder coating for corrosion resistance and easy load-class identification. Outer diameters span Ø6mm to Ø60mm (approx. 0.24 in to 2.36 in), with inner diameters sized at approximately 50% of OD for standard die-set bore compatibility. Free lengths range from 15mm to 300mm (approx. 0.59 in to 11.81 in) across the variant matrix.
Typical use cases include heavy-duty stamping die strippers, injection mold ejector return systems, press brake tooling, and industrial fixture clamping — anywhere a compression die spring for heavy load mold tooling must deliver repeatable, high-force deflection cycle after cycle.
Brown (TB) color code denotes the highest standard load class, delivering maximum spring force per unit deflection for demanding mold and press applications.
OD from Ø6mm to Ø60mm and free lengths from 15mm to 300mm — a single listing covers the full spectrum of common die-spring pocket sizes.
High-alloy wire composition provides superior fatigue resistance and elevated temperature performance compared to standard carbon steel springs.
Color-coded coating enables instant load-class identification on the shop floor and provides a baseline layer of corrosion protection during storage and use.
Precision coiling ensures consistent OD, ID, and free length within tight tolerances, enabling reliable fit in machined spring pockets without modification.
Designed for extended service under repeated compression cycles typical of production stamping and molding operations, reducing unplanned downtime from spring failure.
| Load Class | Super Heavy Load (TB / Brown) |
|---|---|
| Color Code | Brown |
| Material | Chromium-silicon alloy steel (Cr-Si) |
| Surface Finish | Brown powder coat |
| Outer Diameter (OD) | Ø6mm – Ø60mm (approx. 0.24 in – 2.36 in) |
| Inner Diameter (ID) | Approx. 50% of OD (see variant options) |
| Free Length | 15mm – 300mm (approx. 0.59 in – 11.81 in) |
| End Type | Closed and ground ends |
| Standard Reference | ISO 10243 / JIS B 5012 (TB class) |
| Deflection Rate | See variant options |
| Operating Temperature | See variant options |
| Quantity per Order | 1 piece per unit (select quantity at checkout) |
Measure the spring pocket bore in your die plate — this gives you the maximum OD. The ID must clear the guide pin or mandrel. Select the variant whose OD fits the pocket with a small clearance (typically 0.5–1mm) and whose ID is larger than your guide pin diameter. For example, a 12mm x 6mm spring suits a ~13mm bore with a guide pin up to ~5.5mm.
Die springs are classified by load intensity per unit deflection. The standard color hierarchy from lightest to heaviest is: Light (Yellow) → Medium (Blue) → Heavy (Red) → Super Heavy (Brown/TB). Brown TB springs produce the highest force for a given OD and free length, making them suitable for applications requiring maximum stripping or ejection force in a compact space.
Free length should be chosen so that the spring operates within its recommended deflection range — typically 20–30% of free length for super heavy load springs under normal cycling. Measure the available pocket depth and the required working stroke, then select a free length that provides adequate preload at closed position without exceeding the maximum allowable deflection (usually around 30–35% of free length for TB class).
The brown powder coat provides a baseline level of corrosion protection suitable for typical workshop and toolroom environments. For applications with continuous coolant exposure or high humidity, additional protection such as periodic lubrication or a corrosion-inhibiting coating is recommended. The chromium-silicon alloy base material offers better inherent corrosion resistance than plain carbon steel springs.
Yes. Brown TB compression die springs are widely used in injection mold ejector return applications where high return force is needed in a compact spring pocket. Verify that the OD fits your ejector plate spring pocket, the ID clears the return pin, and the free length provides sufficient preload and stroke for your mold's ejector travel.
Replace a die spring when you observe: visible cracking or fracture, a measurable reduction in free length (typically more than 3–5% loss indicates fatigue set), inconsistent stripping or ejection force, or after reaching the manufacturer's recommended cycle count. Proactive replacement during scheduled maintenance prevents unplanned downtime and tooling damage.
These springs are manufactured to the TB (Super Heavy Load / Brown) class dimensions and load specifications consistent with ISO 10243 and JIS B 5012 standards. If your application requires certified test documentation, please contact us to confirm availability for your specific size.
