Heavy Load Duty Compression Die Spring, 8mm-50mm Diameter & Up To 400mm Long JIS

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Heavy Load Duty Compression Die Spring, 8mm-50mm Diameter & Up To 400mm Long JIS

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By HomeDIYer®

Sizes（Outer Diameter × Inner Diameter × Length）: 8x4x15mm

Colour: TM-Red

Amount: 1 Pcs

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$2.65 USD

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In stock (500 units), ready to be shipped

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Heavy Load Duty Compression Die Springs — Reliable Force for Demanding Applications

When a stamping die bottoms out, a mold ejects a part, or a fixture needs consistent return force, a weak spring is the first thing to fail. Engineers, toolmakers, and serious DIY fabricators who rely on repeatable clamping or ejection cycles need heavy load duty compression die springs that hold their rated load cycle after cycle without taking a set. These TM-Red JIS-standard springs are built for exactly that kind of work.

Each spring is a round-wire coil compression spring manufactured to JIS B 5012 heavy-load (TM-Red) specifications. The wire is rectangular in cross-section, wound tightly to maximize load capacity within a compact envelope. Outer diameters span 8 mm (0.31 in) to 50 mm (1.97 in); inner diameters run from 4 mm (0.16 in) to 25 mm (0.98 in); free lengths range from 15 mm (0.59 in) up to 400 mm (15.75 in). Select your exact OD × ID × Length combination from the variant options above.

Typical use cases include injection-mold ejector-pin return systems, progressive stamping die strippers, hydraulic press tooling, jig and fixture clamping mechanisms, and custom automation equipment where a heavy-load compression die spring must deliver consistent force in a confined bore. The TM-Red color coding makes it easy to identify load class at a glance on a busy shop floor.

⚙️ Compatibility: Designed to JIS B 5012 heavy-load (TM-Red) standard. Fits standard die-spring pockets sized for the selected OD. Verify bore diameter, pocket depth, and required free length before ordering.

✅ Key Features of These Heavy Load Compression Die Springs

🔴 TM-Red Heavy-Load Class — Color-coded to JIS B 5012 heavy-load specification, delivering the highest standard load capacity in the JIS die-spring family for demanding press and mold applications.

📐 Wide Size Range — OD from 8 mm to 50 mm and free lengths from 15 mm to 400 mm let you match the exact spring to your die pocket without custom fabrication.

🔩 Rectangular Wire Winding — Rectangular cross-section wire packs more material into each coil compared with round wire, increasing load density and reducing solid height for a given free length.

🔄 Consistent Return Force — Tightly controlled pitch and coil geometry ensure repeatable deflection characteristics across the full production run, critical for stripper plates and ejector systems.

🏭 Drop-In Die-Spring Replacement — Standard JIS dimensions mean these springs are direct replacements for worn TM-Red springs in existing tooling without re-machining the pocket.

🎨 Color-Coded for Fast Identification — The TM-Red finish lets maintenance teams instantly confirm the correct load class during die changes, reducing the risk of installing the wrong spring in a multi-spring die set.

📐 Technical Specifications — Compression Die Springs

Standard	JIS B 5012 Heavy Load (TM-Red)
Load Class	Heavy (TM-Red)
Wire Type	Rectangular cross-section coil
Outer Diameter (OD)	8 mm – 50 mm (0.31 in – 1.97 in)
Inner Diameter (ID)	4 mm – 25 mm (0.16 in – 0.98 in)
Free Length	15 mm – 400 mm (0.59 in – 15.75 in)
Colour / Finish	TM-Red
Spring Rate	See variant options
Maximum Deflection	See variant options
Solid Height	See variant options
Surface Treatment	See variant options
Quantity per Order	1 Pcs (per variant selected)

❓ Frequently Asked Questions

How do I choose the right size compression die spring?

Match the outer diameter (OD) to your die pocket bore, the inner diameter (ID) to your guide pin diameter (with a small clearance), and the free length to your required working stroke plus compressed height. For heavy-load applications, select the TM-Red class and confirm the spring rate meets your required stripping or ejection force. If you are unsure, contact us with your pocket dimensions and required load.

What does the TM-Red color code mean?

Under JIS B 5012, die springs are color-coded by load class. TM-Red indicates the heavy-load class, which provides the highest load capacity per unit of deflection among the standard JIS classes (light/blue, medium/red, heavy/TM-Red, extra-heavy/brown). Always verify the color code matches your tooling specification before installation.

Are these springs corrosion-resistant?

The springs are manufactured from alloy spring steel to JIS heavy-load specifications. Surface treatment details vary by size — please refer to the variant listing or contact us to confirm the specific finish for your selected size. For environments with exposure to coolant, oils, or humidity, consider applying a compatible rust-inhibiting coating after installation.

Can I use these springs as direct replacements in existing tooling?

Yes. These springs are manufactured to JIS B 5012 heavy-load (TM-Red) standard dimensions, making them direct drop-in replacements for worn or broken TM-Red springs in stamping dies, injection molds, and other tooling that was originally designed to JIS specifications. Confirm the OD, ID, and free length match your existing spring before ordering.

What is the maximum deflection I should use in service?

JIS heavy-load die springs are typically rated for a maximum working deflection of approximately 20–30% of free length for long service life, and up to around 40–45% for shorter-cycle or lower-frequency applications. Exceeding the rated deflection significantly reduces fatigue life. Refer to the specific spring's datasheet or contact us for the rated deflection of your selected size.

How many springs do I receive per order?

Each variant is sold as 1 piece (1 Pcs). If you need multiple springs for a die set, simply increase the quantity in your cart or add the same variant multiple times. Bulk pricing inquiries are welcome — contact us for volume orders.

What applications are these compression die springs suitable for?

These heavy-load compression die springs are well-suited for injection-mold ejector-pin return systems, progressive and compound stamping die strippers, hydraulic and mechanical press tooling, jig and fixture clamping, robotic end-of-arm tooling, and any industrial or DIY automation application requiring a reliable, repeatable compression spring in a standard die-spring pocket.

🛒 Select your size (Outer Diameter × Inner Diameter × Length) above, then add to cart.

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These o rings are a great for my ear tunnels

These o rings are a great for my ear tunnels, always loosing one here and there, I always have a new ones in the drawer. Being silicone, don't have any reactions compared to standard rubber ones I purchased at hardware stores, plus much less expensive. Purchased 16mm I'd to use on 19mm tunnels, and stay on great, might be able to get away with 17mm rings, but really happy with my choice.

Will never order from these folks again

I waited a long time and that’s all I received was the eyebolt with no threaded rod attached to it

Perfect they are really made well and I used them for my car

Perfect they are really made well and I used them for my car. The only thing I had a great for us. It took three weeks to get here. So shipping was slow.

did not include wing nuts

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Heavy Load Duty Compression Die Spring, 8mm-50mm Diameter & Up To 400mm Long JIS

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DIY Expert Support

Description

Heavy Load Duty Compression Die Springs — Reliable Force for Demanding Applications

✅ Key Features of These Heavy Load Compression Die Springs

📐 Technical Specifications — Compression Die Springs

❓ Frequently Asked Questions

Heavy Load Duty Compression Die Spring, 8mm-50mm Diameter & Up To 400mm Long JIS

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