50mm x 178mm ISO Die Springs - Medium Duty - Steel 50mm x 178mm ISO Die Springs - Medium Duty - Steel (pack of 1)

Accu Product Code (APC): TJM50-178

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50mm x 178mm ISO Die Springs - Medium Duty - Steel 50mm x 178mm ISO Die Springs - Medium Duty - Steel (pack of 1)

Accu Product Code (APC): TJM50-178

Key Features

Manufactured to ISO Standard.
Please Be Careful Not To Exceed the Specified Maximum Deflection.
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Accu Product Code (APC): TJM50-178
Hole Diameter (D): 50 mm
Rod Diameter (SD): 25 mm
Free Length (L): 178 mm
Spring Constant: 74.91 N/mm
Strength Classification / Colour: Medium Duty / Blue
Dangerous Amount of Deflection: 70.3 mm
Finish: Electrophoretic Coating
Free Length x 25% Cycles: 3,000,000
Free Length x 25% Deflection: 44.5 mm
Free Length x 25% Load: 3333.33 N / 339.91 kgf
Free Length x 30% Cycles: 1,500,000
Free Length x 30% Deflection: 53.4 mm
Free Length x 30% Load: 4000 N / 407.87 kgf
Free Length x 35% Cycles: 500,000
Free Length x 35% Deflection: 60.075 mm
Free Length x 35% Load: 4500 N / 458.86 kgf
Free Length x 40% Cycles: 200,000
Free Length x 40% Deflection: 66.75 mm
Free Length x 40% Load: 5000 N / 509.84 kgf
Hole Diameter Tolerance: -0/+1 mm
Manufacturing Standard: Derived From ISO 10243
Material: Steel
Material Family: Steel
Rod Diameter Tolerance: -0.84/+0 mm
Weight per 100 Units: 107.82 kg

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50mm x 178mm ISO Die Springs - Medium Duty - Steel Description

The 50mm x 178mm ISO Die Springs - Medium Duty - Steel has the following features:

Dangerous Amount of Deflection: 70.3 mm
Electrophoretic Coating Finish
Free Length (L): 178 mm
Free Length x 25% Cycles: 3,000,000
Free Length x 25% Deflection: 44.5 mm
Free Length x 25% Load: 3333.33 N / 339.91 kgf
Free Length x 30% Cycles: 1,500,000
Free Length x 30% Deflection: 53.4 mm
Free Length x 30% Load: 4000 N / 407.87 kgf
Free Length x 35% Cycles: 500,000
Free Length x 35% Deflection: 60.075 mm
Free Length x 35% Load: 4500 N / 458.86 kgf
Free Length x 40% Cycles: 200,000
Free Length x 40% Deflection: 66.75 mm
Free Length x 40% Load: 5000 N / 509.84 kgf
Hole Diameter (D): 50 mm
Hole Diameter Tolerance: -0/+1 mm
Manufacturing Standard: Derived From ISO 10243
Steel
Steel Material Family
Rod Diameter (SD): 25 mm
Rod Diameter Tolerance: -0.84/+0 mm
Spring Constant: 74.91 N/mm
Strength Classification / Colour: Medium Duty / Blue

Discover more about the ISO Die Springs range.

ISO die springs, often called metric die springs, are high-load compression springs produced to ISO dimensional tolerances for repeatable force and a precise fit.

They are built for continuous cycling in tooling and machinery where space is limited, but dependable energy storage and return are essential. For example, in press tools and injection moulding, they keep mechanisms moving smoothly by delivering consistent push-back and reducing unplanned stops.

How ISO Die Springs Work

During operation, the spring compresses to store energy and then returns to its free length, providing a steady, predictable force on every stroke. ISO tolerances keep outer diameter and free length uniform from batch to batch, so ISO die springs drop neatly into standard pocket sizes and make maintenance straightforward.

Strength classes, from light through to extra heavy duty, let you balance force and travel for the task at hand: lighter classes accommodate longer working strokes and more delicate components, while heavier classes deliver higher forces over shorter strokes. (Note: ISO ranges do not include an Extra Light class like their counterpart JIS die springs.) The outcome is reliable performance across press tooling, injection moulds and heavy cycle equipment.

Materials ISO Die Springs Are Made From

Our ISO die springs are made from steel, selected for high compressive strength and fatigue resistance under repeated loading, supporting stable performance and dimensional integrity in demanding industrial environments.

Sizes and Types of ISO Die Springs Available

Accu supplies ISO metric die springs in the following sizes and strength classes to help you match pocket size and required force:

Outer Diameter (OD): 10 mm to 63 mm
Free Length: 25 mm to 305 mm
Strength Classification: Light, Medium, Heavy, Extra Heavy

These options simplify selection for a wide range of layouts, forces and duty cycles.

FAQs

Q: What do the colours mean on ISO die springs?

A: Colour markings indicate the strength classification (Light to Extra Heavy), helping technicians confirm spec during maintenance changeovers. For exact colour mapping, please check our colour chart guide for die springs.

Q: What makes ISO die springs different from standard compression springs?

A: They are produced to ISO manufacturing tolerances for outer diameter and free length, giving a consistent fit in standardised spring pockets and predictable force–deflection behaviour across batches.

Q: How do I choose between Light, Medium, Heavy and Extra Heavy?

A: Start with the available envelope (OD and free length) and your working deflection. Select the class that achieves the target force within the recommended travel. Lighter classes suit longer strokes; heavier classes deliver higher force over shorter strokes.

Q: Do ISO die springs suit high-cycle tooling?

A: Yes, provided they are operated within the working deflection recommended for the chosen class and installed square to minimise side-loading.

Q: What measurements do I need to replace an existing ISO die spring?

A: Measure outer diameter and free length with the spring removed and unloaded, then identify the strength class (often by colour or part code) and match those parameters.

Shipping Information

Shipping Destinations:

Worldwide view delivery information

Weight (100 items):

107.82kg

Component History

Product First Available:

Friday, August 22, 2025

Stock Last Updated:

02:13 AMMonday, June 8, 2026

Specification Last Updated:

Sunday, June 7, 2026

Barcodes

APC (Accu Product Code):

TJM50-178

EAN13 (International Article No.):

5063765372619

ASIN (Amazon Stock Identification No.):

ASIN not defined.

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Hole Diameter (D)

Rod Diameter (SD)

Free Length (L)

Spring Constant

Strength Classification / Colour

Dangerous Amount of Deflection

Finish

Free Length x 25% Cycles

Free Length x 25% Deflection

Free Length x 25% Load

Free Length x 30% Cycles

Free Length x 30% Deflection

Free Length x 30% Load

Free Length x 35% Cycles

Free Length x 35% Deflection

Free Length x 35% Load

Free Length x 40% Cycles

Free Length x 40% Deflection

Free Length x 40% Load

Hole Diameter Tolerance

Manufacturing Standard

Material

Material Family

Rod Diameter Tolerance

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50mm x 178mm ISO Die Springs - Medium Duty - Steel 50mm x 178mm ISO Die Springs - Medium Duty - Steel (pack of 1)

50mm x 178mm ISO Die Springs - Medium Duty - Steel 50mm x 178mm ISO Die Springs - Medium Duty - Steel (pack of 1)

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