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Valve Plate Assy.

Part Number: AB-A640050
Availability: 8 in stock
Leaves our warehouse within 1 business day.
Price: $11.96

This is a genuine Bostitch replacement part, it is sold individually.
The purpose of the Valve Plate is to allow into the cylinder. Once the piston starts traveling up the reeds on the Valve Plate open and air is sent into the air tank.

Overtime the reeds will become worn and the Valve Plate will need to be replaced.
This is also a good time to replace the head gaskets.


This part is compatible with the following machines:

Repair Stories
Tool Type:
Parts Used:
Valve Plate Assy. - AB-A640050
Cyl.-Plate/Plate-Head Gasket - AB-A650300
Repair Difficulty:
Time Spent Repairing:
30-60 minutes
Tools Used:
Screwdriver, Wrench Set, Nutdriver, Adjustable Wrench, Alen wrench
During my basement remodel, my Bostitch air compressor quit building up pressure. It sat idile for 3 years. Bought another inexpensive compressor but ccouldn\\
Simple repair. Removed the cover. Removed air tube from compressor head. Removed 4 head bolts. Removed the head, valve plate assembly and gaskets on both sides of the valve plate. Reassembled in reverse order. was fast in shipping the parts and was over half as expensive as other places. Second time I used them and will continue to with next project.
Discussion for Valve Plate Assy. - ( AB-A640050 )
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  • Comment:
Once my compressor warms up, it can't get above 125psi and therefore continues to run. Would this be a result of worn reed valves?
Reply: Compressor Won't Reach 135psi


Hi Martii,
Replace the cylinder ,piston reed valve and teflon ring along with the head gaskets.This pump used the early reed in the piston configuration and always had trouble pumping up.Also set your pressure to shut off at 120 psi and this will save undue stress on the pump.Hope that helps .Good luck.
I have a Husky H1506F Portable 6 gallon air compressor with a broken reed on the valve plate. The part looks the same as for the Bostitch CAP60P-OF Valve Plate Assembly AB-A640050. Are they the same?
Also there's also a gasket on the reed side which should be replaced. Do you sell that?
Thank you,
Reply: Valve Plate Assembly AB-A640050


Hello 1355251,

Unfortunately we do not supply Husky parts so I won't be able to compare the parts. But I can give you the dimensions on the Bostitch items.

Bostitch AB-A640050 Valve Plate Assembly: 3-1/4 inches x 2-3/4 inches. 3 reed valves in a 1-11/16 indented circle, top and bottom mounting holes center to center 2-5/16. Left and right side mounting holes center to center 2-5/16.

Bostitch AB-A650300 Cyl.-Plate/Plate-Head Gasket: Same dimensions as the Valve Plate except the hole is 2 inches in diameter.

Product Information
Manufacturer: Bostitch
Category Number: AB-A640050
Classification: Part
Weight: 0.15 lbs.
Shipping: Ships Worldwide world wide shipping icon
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