Compression Die Spring Blue - TL Heavy Load Duty Mold Mould Springs OD 8-50mm
Compression Die Spring Blue - TL Heavy Load Duty Mold Mould Springs OD 8-50mm
Compression Die Spring Blue - TL Heavy Load Duty Mold Mould Springs OD 8-50mm
Compression Die Spring Blue - TL Heavy Load Duty Mold Mould Springs OD 8-50mm
Compression Die Spring Blue - TL Heavy Load Duty Mold Mould Springs OD 8-50mm
Compression Die Spring Blue - TL Heavy Load Duty Mold Mould Springs OD 8-50mm
Compression Die Spring Blue - TL Heavy Load Duty Mold Mould Springs OD 8-50mm
Compression Die Spring Blue - TL Heavy Load Duty Mold Mould Springs OD 8-50mm
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Compression Die Spring Blue - TL Heavy Load Duty Mold Mould Springs OD 8-50mmCompression Die Spring Blue - TL Heavy Load Duty Mold Mould Springs OD 8-50mmCompression Die Spring Blue - TL Heavy Load Duty Mold Mould Springs OD 8-50mmCompression Die Spring Blue - TL Heavy Load Duty Mold Mould Springs OD 8-50mmCompression Die Spring Blue - TL Heavy Load Duty Mold Mould Springs OD 8-50mmCompression Die Spring Blue - TL Heavy Load Duty Mold Mould Springs OD 8-50mmCompression Die Spring Blue - TL Heavy Load Duty Mold Mould Springs OD 8-50mmCompression Die Spring Blue - TL Heavy Load Duty Mold Mould Springs OD 8-50mm

Compression Die Spring Blue - TL Heavy Load Duty Mold Mould Springs OD 8-50mm

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$6.07 USD
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In stock (500 units), ready to be shipped

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Description

Compression Die Spring Blue — TL Heavy-Load Mold Springs for Demanding Industrial Applications

When your mold, press, or automation fixture demands consistent, repeatable force cycle after cycle, a weak or mismatched spring becomes the weakest link in the entire assembly. Engineers and toolmakers who work with injection molds, stamping dies, and hydraulic presses need compression die springs that hold their rated load without fatigue — and the Blue TL series is engineered precisely for that duty.

These compression die springs feature a rectangular cross-section wire wound into a cylindrical coil body, finished in a blue coating for corrosion resistance and easy load-class identification. Outer diameters span 8 mm to 50 mm (approx. 0.31 in to 1.97 in), inner diameters run at approximately 50% of OD, and free lengths range from 15 mm to 300 mm (approx. 0.59 in to 11.81 in). The TL designation indicates a heavy load rating, delivering higher spring rates than light or medium series springs of the same OD.

Typical use cases include injection mold stripper plates requiring heavy return force, progressive stamping die lifters and pilots, CNC fixture clamping mechanisms, and robotic end-of-arm tooling where consistent preload is critical. The standardized OD/ID dimensions make these compression die springs direct drop-in replacements for ISO 10243 and JIS B 5012 heavy-load blue series springs used in mold and die tooling worldwide.

🔧 Compatibility: Designed for standard mold spring pockets per ISO 10243 / JIS B 5012 heavy-load (blue) specifications. Verify pocket bore diameter matches OD and guide pin diameter matches ID before ordering.

✅ Key Features of These Compression Die Springs

🔵 Blue TL Heavy-Load Rating
Rectangular wire cross-section delivers a higher spring rate than light or medium series, sustaining heavy clamping and stripping forces across extended production runs.
📐 Wide Size Range
OD from 8 mm to 50 mm paired with free lengths from 15 mm to 300 mm — a single product family covers the majority of standard mold spring pocket configurations.
🛡️ Blue Protective Coating
The blue surface finish provides a corrosion-resistant barrier that also serves as an instant visual load-class identifier, reducing mis-installation risk on the shop floor.
⚙️ Rectangular Wire Construction
Flat-sided wire maximizes the active coil cross-section within a given OD, resulting in a higher solid height ratio and more usable deflection compared to round-wire springs.
🔄 ISO 10243 / JIS B 5012 Compatible Dimensions
Standardized OD and ID dimensions allow direct substitution in existing mold bases and die sets without pocket modification.
📦 Sold Individually (1 PCS per Order)
Order exactly the quantity your toolroom needs — no forced multi-packs. Each spring is individually inspected for dimensional conformance before dispatch.

📐 Technical Specifications — Compression Die Springs

Load Class TL — Heavy Load (Blue)
Wire Cross-Section Rectangular
Outer Diameter (OD) Range 8 mm – 50 mm (0.31 in – 1.97 in)
Inner Diameter (ID) Range 4 mm – 25 mm (approx. 50% of OD)
Free Length Range 15 mm – 300 mm (0.59 in – 11.81 in)
Surface Finish Blue coating (corrosion-resistant)
Dimensional Standard ISO 10243 / JIS B 5012 compatible
Spring Rate See variant options
Maximum Deflection See variant options
Material See variant options
Packing Quantity 1 PCS per order

❓ Frequently Asked Questions

How do I choose the correct OD and ID for my mold spring pocket?

Measure the bore diameter of your spring pocket — this should match the spring OD. Then measure your guide pin or mandrel diameter — this should match or be slightly smaller than the spring ID. For example, a pocket bored to 16 mm with a 7 mm guide pin takes a 16 mm OD × 8 mm ID spring. Always allow a small clearance (typically 0.1–0.3 mm) between the guide pin and the spring ID to prevent binding during compression.

What does the TL (heavy load) blue designation mean compared to other colors?

Die springs are color-coded by load class. Blue indicates a TL (heavy load) rating, which provides a higher spring rate than yellow (light load) or red (medium load) springs of the same OD and free length. Heavy-load blue springs are used where high clamping, stripping, or return forces are required within a compact pocket depth. If you are replacing an existing spring, match the color to maintain the same load characteristics.

How do I select the correct free length for my application?

The free length should be chosen so that the spring operates within 20–30% of its maximum rated deflection under working load, and never exceeds 30–40% deflection at maximum stroke. Measure your pocket depth and the required stroke, then select a free length that keeps the spring within its safe working deflection range. Consult the spring rate data for your specific OD/length combination to calculate the exact working load.

Are these springs corrosion-resistant enough for coolant environments?

The blue coating provides a degree of corrosion resistance suitable for typical mold and die environments where cutting fluids and coolants are present. For highly aggressive chemical environments or prolonged submersion, additional protective measures or stainless-steel alternatives may be advisable. Wipe springs dry after exposure to coolant to extend service life.

Can I use these springs as direct replacements for ISO 10243 or JIS B 5012 heavy-load blue springs?

Yes. These compression die springs are dimensioned to be compatible with ISO 10243 and JIS B 5012 heavy-load (blue) specifications. The standardized OD and ID dimensions allow direct drop-in replacement in existing mold bases and die sets without modifying the spring pocket, provided you select the matching OD, ID, and free length.

What is the difference between rectangular wire and round wire compression springs?

Rectangular (flat) wire die springs pack more metal cross-section into the same OD envelope compared to round wire springs. This results in a higher spring rate, greater load capacity, and a lower solid height for the same free length — meaning more usable deflection before coil bind. These characteristics make rectangular wire springs the standard choice for mold and die tooling where space is limited and high forces are required.

How many springs should I order for a typical mold?

The number of springs depends on your mold design — stripper plates commonly use 4, 6, 8, or more springs arranged symmetrically to distribute the return force evenly. Since these springs are sold individually (1 PCS per order), simply set the quantity to match the number of spring pockets in your mold. It is good practice to order one or two spares for your toolroom stock.

🛒 Select your OD × Length combination above, then add to cart.

 

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