Part Number: 7640
Category: Pressure Washer Accessories → Spray Nozzles → High-Pressure Spray Nozzles
Type: PNR 1/4" MNPT 40° 20.0 Stainless Steel Spray Nozzle – Pressure Washer Replacement Nozzle

The PNR Stainless Steel Spray Nozzle (Part #7640) is a genuine OEM high-pressure replacement nozzle engineered for commercial, industrial, agricultural, and heavy-duty pressure washing applications. Featuring a 40-degree fan spray pattern and a 20.0 orifice, this nozzle delivers a wide, even spray with high flow capacity, making it ideal for rinsing, washing, and cleaning large surface areas while maintaining consistent operating pressure on compatible high-flow pressure washer systems.

Key Features & Benefits

• Genuine PNR OEM high-pressure spray nozzle
• Part Number: 7640
• Wide 40° fan spray pattern
• 20.0 orifice size for high-flow applications
• 1/4" MNPT connection
• Manufactured from AISI 416 stainless steel
• Precision-machined for consistent spray performance
• Corrosion and wear resistant
• Excellent for rinsing and large-area cleaning
• Ideal for commercial and industrial pressure washing
• OEM-quality construction for long service life

Technical Specifications

Part Number: 7640

Manufacturer: PNR

Product Type: High-Pressure Spray Nozzle

Thread Size: 1/4" MNPT

Spray Pattern: 40°

Orifice Size: 20.0

Nozzle Size: 20.0

Material: AISI 416 Stainless Steel

OEM Replacement: Yes

Compatible Applications

Suitable for use with:

• Pressure washer spray guns
• Pressure washer spray wands
• Pressure washer lances
• High-flow commercial pressure washers
• Industrial cleaning equipment
• Fleet washing
• Heavy equipment cleaning
• Agricultural equipment cleaning
• Building exterior cleaning
• General-purpose pressure washing

Always verify the thread size, nozzle size, operating pressure, flow rate, and machine specifications before ordering.

Function of the Spray Nozzle

The PNR 7640 spray nozzle helps:

• Produce a wide 40° high-pressure fan spray
• Deliver high water flow with broad, even coverage
• Rinse large surfaces efficiently
• Maintain consistent operating pressure and water distribution
• Improve cleaning productivity on commercial and industrial jobs

Its 40° spray pattern and 20.0 orifice make it an excellent choice for high-flow pressure washer systems that require efficient coverage of large areas with moderate cleaning force.

Common Signs Replacement Is Needed

Replace the nozzle if you notice:

• Uneven or distorted spray pattern
• Reduced cleaning performance
• Worn or enlarged orifice
• Clogged nozzle
• Damaged threads
• Corrosion or physical damage
• Increased water flow due to nozzle wear causing pressure loss

Replacing a worn nozzle restores proper spray pattern, operating pressure, and cleaning efficiency.

Installation & Service Notes

• Turn off the pressure washer and relieve system pressure before replacing the nozzle.
• Verify compatibility with the 1/4" MNPT connection and 20.0 orifice size.
• Install the nozzle securely without overtightening the stainless steel threads.
• Inspect the nozzle seat and threads for debris before installation.
• Test the spray pattern after installation to confirm proper operation.
• Replace the nozzle if wear results in pressure loss or an inconsistent spray pattern.

Important: Match the 20.0 orifice size to your pressure washer's GPM and PSI ratings to maintain proper operating pressure and performance. The 40° spray pattern is intended for wide-area cleaning and rinsing applications, making it ideal for large equipment, vehicles, buildings, and other expansive surfaces.

Maintenance Recommendations

• Flush the nozzle with clean water after each use.
• Inspect the orifice regularly for mineral buildup, debris, or wear.
• Clean clogged nozzles using an approved nozzle cleaning tool—avoid using wire or sharp objects that may damage or enlarge the precision orifice.
• Store the nozzle in a clean, dry location when not in use.
• Use only genuine OEM replacement nozzles to maintain proper spray pattern, operating pressure, and long service life.