We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Small square black 40mm case fan with three wires

SXDOOL

SXDOOL JMC 4020-12 506340-014 40x40x20mm 12V 0.10A 3-wire case fan

SKU CH-W6A8-WP17A

A 40mm square, 20mm deep case fan running at 12V and 0.10A with a 3-pin connector

  • Product typeCase Fan
  • Ultra-quiet 3-pin operation for low-noise builds
  • Compact 40x40x20mm frame fits tight chassis spaces
  • Efficient 12V 0.10A draw keeps power use minimal
  • Standard three-wire connector enables speed monitoring
  • JMC 4020-12 506340-014 model ensures exact replacement match

Compact 40 mm case fan for tight builds

The SXDOOL JMC 4020-12 measures 40 by 40 by 20 mm and runs on 12 V at 0.10 A. Its three-wire connector provides speed reporting to the motherboard. The small footprint suits compact chassis, small-form-factor PCs or targeted component cooling where larger fans cannot fit.

Low power draw and reported quiet operation

At 0.10 A the fan draws minimal current from a 12 V header. The manufacturer highlights ultra-quiet performance for normal use. The 3-pin design allows the system to monitor RPM, though voltage control rather than PWM governs speed changes.

Basic three-wire connectivity only

The bundle consists of the fan unit with its integrated 3-pin lead. No mounting screws, adapters, speed controllers or software utilities are included. Builders needing PWM control, RGB lighting or extra wiring length must source those separately.

How it compares

Measured against everything we stock in PC Cooling Fans, at today’s prices. Recalculated every night.

Price $14.99
Cheaper than about 67% of the 8,339 comparable items (median $19.99).

New to this? Which coin should you pay with — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Product typeCase Fan

Questions about this item

How do I install the 40mm x 40mm x 20mm fan and what is the common wiring mistake?

Mount the fan using the four corner screw holes on the 40mm frame, then connect the 3-pin plug to a 12V motherboard header or fan controller; the frequent error is reversing the three wires so the tachometer signal goes to ground.

What maintenance will the JMC 4020-12 need over time?

Dust the blades and frame every few months with compressed air; the sleeve bearing is not user-serviceable, so plan to replace the entire 4020-12 unit when noise or vibration increases.

What limit appears first when the 506340-014 runs continuously at 12V?

The 0.10A motor draws constant current, so the sleeve bearing’s lubricant life becomes the limiting factor, leading to rising acoustic noise before airflow drops noticeably.

More in PC Cooling Fans

Similar items