Die Springs Coil Compression Spring X Heavy Duty Ratio 76% 14mm x 7mm Brown TB

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Die Springs Coil Compression Spring X Heavy Duty Ratio 76% 14mm x 7mm Brown TB

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OD x ID（mm）: 14 x 7 mm

Length（MM）: 20mm

QTY(pcs): 1 Pcs

Price:

$6.60 USD

Stock:

In stock (500 units), ready to be shipped

Quantity:

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14mm x 7mm X Heavy Duty Die Springs — Reliable Force for Demanding Tooling Applications

When your stamping die, injection mold, or press tool demands consistent, repeatable spring force cycle after cycle, an undersized or mismatched spring becomes a costly liability. Engineers and toolmakers who work with high-load progressive dies, blanking tools, and forming fixtures need a compression spring rated for extreme deflection without premature fatigue. These X Heavy Duty die springs are engineered for exactly that environment.

Each spring features an outer diameter (OD) of 14 mm (0.551 in) and an inner diameter (ID) of 7 mm (0.276 in), with available lengths ranging from 20 mm (0.787 in) to 100 mm (3.937 in). The brown color coding identifies the X Heavy Duty load rating per ISO 10243 / JIS B 5012 standards. Springs are wound from high-grade rectangular-section alloy steel wire and finished with a consistent closed-and-ground end profile for stable seating.

Typical use cases include precision die sets requiring maximum force in a compact bore, stripper plate assemblies in progressive stamping dies, and spring-loaded ejector mechanisms in plastic injection molds where space is constrained and load demands are high.

🔧 Compatibility: Fits standard 14 mm OD die spring pockets. Compatible with ISO 10243 and JIS B 5012 X Heavy Duty (Brown) specifications. Suitable for use in die sets, mold bases, and tooling fixtures designed for 14 mm OD spring bores.

✅ Key Features of These X Heavy Duty Die Springs

🟤

X Heavy Duty Brown Rating

Brown color code denotes the highest standard load class — maximum force output for the given OD/ID, ideal for high-tonnage tooling.

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14 mm OD × 7 mm ID

Precise dimensional tolerances ensure consistent fit in standard 14 mm spring pockets across die sets and mold bases.

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13 Length Options: 20–100 mm

Choose from 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 90, and 100 mm free lengths to match your specific stack height requirements.

🔩

Rectangular-Section Alloy Steel Wire

Flat wire winding maximizes the number of active coils within a given length, delivering higher load capacity versus round-wire springs of the same envelope.

⚙️

Closed and Ground Ends

Ground end faces provide a flat, stable seating surface that minimizes lateral deflection and ensures even load distribution across the spring pocket.

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Flexible Pack Quantities

Available in 1, 2, 6, 10, and 20-piece packs — order a single replacement or stock up for production tooling runs without overpaying.

📐 Technical Specifications — X Heavy Duty Die Compression Springs

Outer Diameter (OD)	14 mm (0.551 in)
Inner Diameter (ID)	7 mm (0.276 in)
Free Length Options	20 / 25 / 30 / 35 / 40 / 45 / 50 / 55 / 60 / 65 / 70 / 90 / 100 mm
Load Rating	X Heavy Duty
Color Code	Brown (ISO 10243 / JIS B 5012)
Wire Section	Rectangular (flat wire)
End Type	Closed and Ground
Deflection Ratio	76%
Material	Alloy steel (chromium-vanadium or equivalent)
Surface Finish	See variant options
Pack Quantity Options	1 / 2 / 6 / 10 / 20 pcs
Standard Reference	ISO 10243 / JIS B 5012

❓ Frequently Asked Questions

How do I select the correct free length for my die set?

Measure the available spring pocket depth in your die set and determine the required working stroke. The free length should be long enough so that at maximum compression (working stroke + preload), the spring does not reach solid height. A common rule is to keep total deflection within the rated 76% deflection ratio. For example, a 50 mm free spring compressed 38 mm (76%) reaches its design limit — size up if your stroke approaches this figure.

What does the brown color code mean, and how does it compare to other ratings?

Die springs are color-coded by load class. Brown indicates X Heavy Duty — the highest standard load rating. In ascending order: Light (yellow) → Medium (red) → Heavy (blue) → X Heavy (brown). Choose brown when you need maximum force in the smallest possible OD/ID envelope, such as in compact progressive die stations with high blanking or forming loads.

Are these springs compatible with ISO 10243 and JIS B 5012 die spring standards?

Yes. These springs are dimensioned and load-rated in accordance with ISO 10243 and JIS B 5012 specifications for X Heavy Duty (brown) die springs. They are interchangeable with other ISO/JIS-compliant springs of the same OD, ID, and free length from standard tooling suppliers.

How corrosion-resistant are these die springs?

These springs are manufactured from alloy steel (chromium-vanadium or equivalent) and may carry a surface treatment such as shot peening or a light oil coating to resist oxidation during storage. For applications in humid or coolant-exposed environments, periodic inspection and light lubrication are recommended. If your application requires stainless steel or special coatings, contact us to confirm availability.

Can I use these springs in injection mold ejector systems?

Yes. The 14 mm OD × 7 mm ID profile is a common size used in ejector plate return spring pockets on injection mold bases. The X Heavy Duty rating provides strong return force even in compact pocket depths. Verify that your mold base pocket diameter accommodates a 14 mm OD spring and that the pocket depth matches your chosen free length.

How do I choose between 1-piece and multi-piece packs?

If you are replacing a single worn spring in an existing tool, the 1-piece option is the most economical choice. For new tooling builds or production maintenance kits, the 6, 10, or 20-piece packs offer a lower per-unit cost and ensure you have matched springs on hand for balanced multi-spring layouts. Die sets typically use springs in even-numbered sets (4, 6, 8) to distribute load symmetrically.

What is the expected service life of these X Heavy Duty die springs?

Service life depends on operating deflection, cycle rate, and lubrication. When operated within the rated 76% deflection ratio and with adequate lubrication, die springs of this class are typically rated for approximately 500,000 to 1,000,000 cycles under standard conditions. Exceeding the rated deflection or running dry significantly reduces fatigue life. Replace springs showing visible set (permanent shortening) or surface cracking.

🛒 Select your OD x ID and Length above, then add to cart.