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Five green aluminium-cased wirewound resistors with mounting tabs

Unique-Bargains

Unique-Bargains 25W 18 Ohm Aluminium Chassis Mount Wirewound Resistors Green 5pcs

SKU CH-PQWZ-23D42

Pack of five 18 Ω 25 W wirewound resistors in aluminium chassis-mount housings for high-power heat dissipation

  • 25 W power rating handles demanding circuits
  • 18 Ω ±5 % tolerance for precise current control
  • Aluminium chassis-mount housing dissipates heat efficiently
  • 53 × 27 × 15.5 mm body fits tight enclosures
  • Pack of five resistors supports multi-point designs

25 W 18 Ω chassis-mount wirewound resistors

These aluminium-housed wirewound resistors are rated at 18 Ω with ±5 % tolerance and 25 W continuous dissipation. They mount directly to a chassis or heatsink using 3.5 mm screw holes. The pack contains five new components for power-circuit prototyping, repair or small-batch production.

Sustained-load thermal behaviour

The aluminium-ceramic-alloy body (27 × 16 × 15.5 mm) conducts heat to the mounting surface, so steady-state temperature rise depends on the thermal resistance of the attached plate. Without forced air or a large heatsink the resistor will reach its rated temperature at full 25 W; derating is required if the mounting interface cannot remove heat at that rate.

Single spec that decides fit

The 18 Ω ±5 % value is the critical parameter: the circuit must call for this exact resistance and tolerance. If the design needs a different ohmic value, tighter tolerance or a non-inductive winding, these parts will not meet the requirement.

Highlights

  • 25 W power rating handles demanding circuits
  • 18 Ω ±5 % tolerance for precise current control
  • Aluminium chassis-mount housing dissipates heat efficiently
  • 53 × 27 × 15.5 mm body fits tight enclosures
  • Pack of five resistors supports multi-point designs

Specifications

BrandUnique Bargains

Questions about this item

How much heat does each 25 W aluminium-cased resistor dissipate when running continuously?

Each unit is rated for 25 W continuous power; the aluminium housing and ceramic core are designed to transfer that heat to a mounting plate or cooling surface.

What mounting hardware is required to install these chassis-mount resistors?

You need a flat metal panel with two 3.5 mm clearance holes spaced to match the 53 mm total length, plus screws and thermal compound or a mica washer for thermal contact.

Will the 18 Ω ±5 % value and wirewound construction work in legacy tube-amp bias or vintage power-supply circuits?

The 18 Ω ±5 % tolerance and non-inductive wirewound element suit older designs that specify a 25 W chassis-mount power resistor.

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