18mm x 70mm JIS Die Springs - Medium Duty - Steel 18mm x 70mm JIS Die Springs - Medium Duty - Steel (pack of 1)

Accu Product Code (APC): TM18x70

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18mm x 70mm JIS Die Springs - Medium Duty - Steel 18mm x 70mm JIS Die Springs - Medium Duty - Steel (pack of 1)

Accu Product Code (APC): TM18x70

Key Features

Manufactured to JIS Standard.
Please Be Careful Not To Exceed the Specified Maximum Deflection.
Free Technical Support From Our Engineers.

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Accu Product Code (APC): TM18x70
Outside Diameter (D): 18 mm
Rod Diameter (SD): 9 mm
Free Length (L): 70 mm
Spring Constant: 28.22 N/mm / 2.88 kgf/mm
Strength Classification / Colour: Medium Duty / Red
Finish: Electrophoretic Coating
Free Length x 40% Cycles: 1,000,000
Free Length x 40% Deflection: 17.9 mm
Free Length x 40% Load: 510 N / 52.0 kgf
Free Length x 45% Cycles: 500,000
Free Length x 45% Deflection: 20.2 mm
Free Length x 45% Load: 569 N / 58.0 kgf
Free Length x 50% Cycles: 300,000
Free Length x 50% Deflection: 22.4 mm
Free Length x 50% Load: 637 N / 65.0 kgf
Manufacturing Standard: JIS B 5012:2008
Material: Steel
Material Family: Steel
Weight per 100 Units: 5.8 kg

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18mm x 70mm JIS Die Springs - Medium Duty - Steel Description

The 18mm x 70mm JIS Die Springs - Medium Duty - Steel has the following features:

Electrophoretic Coating Finish
Free Length (L): 70 mm
Free Length x 40% Cycles: 1,000,000
Free Length x 40% Deflection: 17.9 mm
Free Length x 40% Load: 510 N / 52.0 kgf
Free Length x 45% Cycles: 500,000
Free Length x 45% Deflection: 20.2 mm
Free Length x 45% Load: 569 N / 58.0 kgf
Free Length x 50% Cycles: 300,000
Free Length x 50% Deflection: 22.4 mm
Free Length x 50% Load: 637 N / 65.0 kgf
Manufacturing Standard: JIS B 5012:2008
Steel
Steel Material Family
Outside Diameter (D): 18 mm
Rod Diameter (SD): 9 mm
Spring Constant: 28.22 N/mm / 2.88 kgf/mm
Strength Classification / Colour: Medium Duty / Red

Discover more about the JIS Die Springs range.

JIS die springs are high-load compression springs manufactured to Japanese Industrial Standards (JIS) tolerances for repeatable force and dimensional consistency.

They are designed for cyclic operation in tooling and machinery where space is constrained, but reliable energy storage and return are essential. In press tools and injection moulding, they provide reliable push-back and steady performance, helping machines run smoothly and avoid unexpected stops.

How JIS Die Springs Work

Under load, a JIS die spring compresses to store energy and returns to its original length when released, delivering a consistent, repeatable force.

Tight JIS tolerances keep the outer diameter and free length uniform from batch to batch, so springs fit standard pockets and maintenance stays straightforward.

Strength classes, from extra light to extra heavy, let you match spring rate and safe working travel to the application: lighter classes suit longer strokes and delicate parts; heavier classes handle higher forces over shorter strokes.

Materials JIS Die Springs Are Made From

Our selection of JIS die springs is manufactured from steel, chosen for its high compressive strength and fatigue resistance under repeated cycling, supporting stable performance and dimensional integrity in demanding tooling environments.

Sizes and Types of JIS Die Springs Available

Accu’s range of JIS die springs is available in the sizes and strength classes below, helping you match your pocket size and required force.

Outer Diameter (OD): 8 mm to 70 mm
Free Length: 10mm to 350mm
Strength Classification: Extra Light, Light, Medium, Heavy, Extra Heavy

These options enable straightforward selection to suit available pocket sizes and target forces across a wide range of tooling layouts.

FAQs

What distinguishes JIS die springs from general compression springs?

JIS die springs are built to JIS manufacturing tolerances for OD and free length, enabling consistent fit in standardised spring pockets and predictable force–deflection behaviour across production batches.

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

Match the class to your required force and stroke. Lighter classes support longer deflection at lower force and heavier classes provide higher force over shorter working strokes.

Start with your available space (OD and free length), define the working deflection, then select the class that delivers the target force within recommended operating limits.

Are JIS die springs suitable for high-cycle applications in presses and moulds?

Yes, provided the spring is operated within its recommended working deflection for the chosen strength class and installed squarely in a correctly sized pocket to minimise side-loading.

How should I measure to replace an existing die spring?

Measure the outer diameter and free length with the spring removed and unloaded. Note the strength classification (often identified by colour or part code), then match these parameters to the replacement.

What do the spring colours mean?

Colour markings identify the strength classification (e.g., Extra Light through Extra Heavy). This helps maintenance teams quickly verify specifications during changeovers. For exact colour matching, please refer to our colour chart guide for die springs.

Shipping Information

Shipping Destinations:

Worldwide view delivery information

Weight (100 items):

5.8kg

Component History

Product First Available:

Friday, August 22, 2025

Stock Last Updated:

01:52 AMMonday, June 15, 2026

Specification Last Updated:

Sunday, June 14, 2026

Barcodes

APC (Accu Product Code):

TM18x70

EAN13 (International Article No.):

5063765383967

ASIN (Amazon Stock Identification No.):

ASIN not defined.

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Outside Diameter (D)

Rod Diameter (SD)

Free Length (L)

Spring Constant

Strength Classification / Colour

Finish

Free Length x 40% Cycles

Free Length x 40% Deflection

Free Length x 40% Load

Free Length x 45% Cycles

Free Length x 45% Deflection

Free Length x 45% Load

Free Length x 50% Cycles

Free Length x 50% Deflection

Free Length x 50% Load

Manufacturing Standard

Material

Material Family

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18mm x 70mm JIS Die Springs - Medium Duty - Steel 18mm x 70mm JIS Die Springs - Medium Duty - Steel (pack of 1)

18mm x 70mm JIS Die Springs - Medium Duty - Steel 18mm x 70mm JIS Die Springs - Medium Duty - Steel (pack of 1)

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