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Thirty silver carbon steel compression springs 7.5 mm diameter 20 mm long

Unique-Bargains

Unique-Bargains 3D Printer Bed Springs 7.5 x 20 mm 30pcs

SKU CH-30JG-4PF9T

Set of 30 carbon-steel compression springs, 7.5 mm outer diameter and 20 mm free height, for levelling 3D printer heated beds

  • Carbon steel resists fatigue better than ordinary steel
  • 30 springs included for full bed replacement or spares
  • 20 mm free height suits common 3D printer beds
  • 5 mm outer diameter fits standard mounting points
  • Recommended for 3.5 mm or thicker aluminium bed plates

30 Carbon-Steel Bed Springs

This pack contains thirty compression springs sized for 3D printer heated beds. Each spring is made from carbon steel for higher fatigue resistance and surface hardness than ordinary steel. The dimensions are 7.5 mm outer diameter, 5 mm inner diameter, 1.2 mm wire diameter and 20 mm free height. They suit most common printer beds that accept this spring size.

Recommended for 3.5 mm or thicker aluminium plates

The supplier notes that the springs perform best on aluminium bed plates of 3.5 mm thickness or greater. Thinner plates may not provide enough rigidity for consistent bed levelling. Using the recommended plate thickness helps the springs maintain even pressure across the build surface during heating and printing cycles.

7.5 mm outer diameter decides fit

The critical specification is the 7.5 mm outer diameter, which must match the mounting holes or slots on your printer’s bed carriage. If your machine uses a different spring diameter these will not install correctly. Verify the required outer diameter before ordering to avoid compatibility issues.

How it compares

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Price $4.99
Cheaper than about 99% of the 5,855 comparable items (median $91.99).

Specifications

Product
Brand nameUnique Bargains

Questions about this item

How often should the carbon-steel compression springs be inspected or replaced on a heated bed?

Inspect the 30 springs each time you relevel the bed; replace any that have lost free height or show permanent compression.

Which dimension limits how thick a build plate can be used with these 7.5 mm outer-diameter springs?

The 5 mm inner diameter and 1.2 mm wire set the maximum plate thickness at roughly 3.5 mm aluminium or equivalent.

Do the 20 mm free-height springs add noticeable heat or vibration when the printer runs continuously?

The carbon-steel springs are passive components; they generate no heat, noise or vibration during all-day printing.

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