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Small square case fan with isosceles mounting holes 26mm apart 20mm thick 2-pin connector

Fans

Fans 4010 Isosceles 26 20mm 2-pin FS1240-A1042A case fan

SKU CH-85SH-NZXHB

A 40 mm case fan with an isosceles mounting pattern, 20 mm thickness and a 2-pin connector

  • Original 4010 mounting fits specific graphics cards
  • Isosceles 26 layout ensures correct screw alignment
  • 20 mm thickness clears tight component gaps
  • Two-pin power simplifies direct board connection

4010 isosceles mounting fan

This 4010 case fan uses an isosceles hole pattern with a 26 mm spacing and a 20 mm frame thickness. It connects through a 2 pin power connector and carries the part number FS1240-A1042A. The unit is supplied new for graphics card or small-form-factor cooling.

Suits tight clearance builds

Builders who need a thin 20 mm fan with the specific 4010 isosceles layout will find this model fits directly. Buyers who require PWM speed control or a different hole spacing should look at alternative designs.

How it compares

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

Price $13.99
Cheaper than about 70% of the 8,339 comparable items (median $19.99).

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Specifications

No published specifications for this item yet.

Questions about this item

What spacing do the mounting holes on this FS1240-A1042A fan use?

The mounting holes are spaced 26 mm apart in an isosceles pattern, matching the 4010 form factor.

Can I plug this 2-pin fan into a 3-pin motherboard header?

Yes, the 2-pin connector fits a 3-pin header; the fan will run at full speed without PWM control.

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