Heavy Load Duty Compression Die Spring ISO - 6mm Diameter & Up To 100mm Long

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Heavy Load Duty Compression Die Spring ISO - 6mm Diameter & Up To 100mm Long

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By HomeDIYer®

Outer Diameter * Inner Diameter * Length: 6 x 3 x 10 mm

Load: TF-Yellow

Material Selection: Alloy steel

Price:

$3.90 USD

Stock:

In stock (500 units), ready to be shipped

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Compression Die Spring ISO — Reliable Return Force for Precision Tooling

When a die set chatters, a fixture won't reset cleanly, or a clamp loses its rebound mid-cycle, the culprit is usually an under-spec spring. These ISO compression die springs are built for machinists, tool-and-die makers, and workshop DIYers who need consistent return force in tight, high-cycle assemblies.

Each spring measures 6 mm outer diameter and 3 mm inner diameter, with free lengths from 10 mm up to 100 mm (roughly 0.39" to 3.94"). They are wound from alloy steel or SWOSC-V oil-tempered valve-spring wire, and are colour-coded by load class: TL-Blue (light), TM-Red (medium), TF-Yellow (heavy), and TH-Green (extra heavy).

Typical uses include compression die springs for stamping and punch tooling, ISO die spring replacements in injection-mould ejector systems, and heavy-duty return springs for jigs, clamps, and machine guarding. The colour-coded load system makes it straightforward to match rebound force to your application.

🔧 Designed to ISO 10243 hole-and-rod conventions for 6 mm bore pockets — confirm your pocket depth against the free length you select.

✅ Key Features of These Compression Die Springs

🎨 Colour-coded load ratings — TL-Blue, TM-Red, TF-Yellow, and TH-Green let you match return force to the job at a glance.

📏 Wide length range — 16 free lengths from 10 mm to 100 mm (approx. 0.39"–3.94") for shallow to deep pockets.

⚙️ Two wire materials — choose alloy steel for general duty or SWOSC-V oil-tempered wire for higher fatigue resistance.

🔁 Built for high-cycle work — consistent rebound suits stamping dies, ejector systems, and repetitive clamping.

🎯 ISO-referenced sizing — 6 mm OD / 3 mm ID geometry designed around standard die-spring pocket conventions.

🛠️ Workshop-ready — suited to tooling repairs, jig building, and machinery maintenance without custom winding.

📐 Technical Specifications — Compression Die Spring

Spring Type	Compression die spring (ISO-referenced)
Outer Diameter	6 mm (approx. 0.24")
Inner Diameter	3 mm (approx. 0.12")
Free Length Range	10–100 mm (approx. 0.39"–3.94") — See variant options
Material	Alloy steel or SWOSC-V oil-tempered wire — See variant options
Load Rating	TL-Blue (light), TM-Red (medium), TF-Yellow (heavy), TH-Green (extra heavy) — See variant options
Finish	Colour-coded by load class
Wind Direction	Contact us to confirm

❓ Frequently Asked Questions

How do I choose the right free length for my die pocket?

Match the spring free length to your pocket depth plus the required working stroke, leaving room so the spring is not fully compressed (coil-bound) at maximum travel. Lengths run from 10 mm to 100 mm — select the value under the size option that fits your pocket.

What do the colours TL-Blue, TM-Red, TF-Yellow, and TH-Green mean?

They indicate load class: TL-Blue is light duty, TM-Red is medium, TF-Yellow is heavy, and TH-Green is extra heavy. Higher load classes deliver more return force for the same dimensions, so choose based on the force your application needs.

What is the difference between the alloy steel and SWOSC-V options?

Alloy steel suits general-purpose compression duty. SWOSC-V is an oil-tempered valve-spring-grade wire that typically offers higher fatigue resistance for demanding, high-cycle applications. Both are available as a variant selection.

Are these springs corrosion resistant?

These are spring-steel wire springs colour-coded by load class rather than plated for corrosion protection. For damp or washdown environments, keep them lightly oiled or contact us to confirm suitability for your conditions.

Will a 6 mm OD spring fit a standard ISO die pocket?

The 6 mm outer diameter and 3 mm inner diameter are designed around standard die-spring pocket-and-rod conventions. Confirm your pocket bore and guide-rod diameter against these dimensions before ordering.

How do I decide which spring to buy for a repair?

Measure the outer diameter, inner diameter, and free length of the original spring, then match the load colour to the force you need. If the original spring specification is unknown, contact us to confirm the closest option.

🛒 Select your length, load rating, and material 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

Hi Scott, thank you for your feedback. We're sorry for any inconvenience caused. Please get in touch with us directly, and we'll assist you. Thanks for shopping with HomeDIYer!

Haven't received the order yet! It's been over

Haven't received the order yet! It's been over 19 days!

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Heavy Load Duty Compression Die Spring ISO - 6mm Diameter & Up To 100mm Long

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Description

Compression Die Spring ISO — Reliable Return Force for Precision Tooling

✅ Key Features of These Compression Die Springs

📐 Technical Specifications — Compression Die Spring

❓ Frequently Asked Questions

Heavy Load Duty Compression Die Spring ISO - 6mm Diameter & Up To 100mm Long

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