Features:

• Barrel
• Stainless steel (Type 304).
• Drawn and polished I.D. provides ideal lube-holding, low friction surface.
• Matte finish on O.D.
• Barrel attached to heads by Humphrey roll forming process.
• Heads
• Aluminum. Internal face grooved for positive air flow to piston seals.
• Piston Rod
• Accuracy stock, centerless ground and polished Type 303 Stainless Steel, standard all models.
• Wrench flats, standard most models, chamfered for easy wrench contact without rod damage.
• Threads are Roll Formed for strength and durability.
• Piston
• Unique Humphrey Piston may be factory assembled in two different ways – same overall dimensions with or without Bumpers.
• Piston threads are Roll Formed for greater strength and durability. 
• Seals
• Buna N standard on all models.
• Fluorocarbon (fluoroelastomer…Option F) available for high ambient temperatures; for extremely high cycling conditions with limited lubrication; or mild chemical resistance (air supply contaminants and /or lubricants).
• Seal design insures constant contact with cylinder barrel…eliminates seal collapse and blow-by.
• Rod Bushing
• Oil permeated bronze, ball-sized to close tolerance…provides rod support and smooth, low friction rod movement for longer cylinder life.
• Pressure Ports
• Full, unrestricted porting for maximum air flow…combines with groove in Heads to provide fast cylinder response and smooth rod movement.

Dimensions:

• Nose Thread: 5/8-18 x 1/2"

Ports: 1/8" NPT