Graco 163821 Silver Flat Tip, 821

The Graco 163821 Silver Flat Tip (821) is a durable, high-pressure flat-spray tip for consistent coverage. Use with Silver Flat Tip guard/seat on airless sprayers rated up to 5000 psi.

Orifice: 0.021" for medium-to-heavy coatings
Fan width: ~16–18" (pressure & distance dependent)
Pressure rating: up to 5000 psi
Fits: Guns/sprayers using the Silver Flat Tip guard/seat
Use on: primers, acrylics, elastomerics (check TDS)

List Price: $54.25

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Description

Product Overview – Precision Flat-Spray Tip for Airless Applications

Compatible Machines

This Graco 163821 Silver Flat Tip (821) fits Graco airless sprayers and guns that use the Silver Flat Tip seat/guard and are rated up to 5000 psi. Confirm your gun’s tip guard/seat before purchase.

Contractor-grade Graco airless sprayers using Silver Flat Tip guard/seat (up to 5000 psi)
Popular Graco rigs (verify guard/seat): Ultra Max II Series (795 / 1095 / 1595)
Texture/High-output rigs (verify guard/seat): Mark V HD, Mark X HD
Gas & hydraulic duty (verify guard/seat): GMAX II 3900; GH 230 / GH 300
Prosumer units (verify guard/seat & pressure): Magnum X5, X7; ProX17 / ProX19 / ProX21

Key Details

The Graco 163821 Silver Flat Tip (821) delivers a consistent, fan-shaped pattern for uniform coverage on medium-to-heavy coatings.

Specification	Value
Part #	163821
Tip Code	821 (8 ≈ fan size; 21 = 0.021" orifice)
Orifice Size	0.021"
Typical Fan Width	Approx. 16–18" (at standard gun distance)
Max Working Pressure	5000 psi (approx.)
Series	Graco Silver Flat Tip
Use On	Airless guns/sprayers with matching Silver Flat Tip guard/seat

Features & Benefits

Consistent fan for even coverage on walls, siding, steel, and general protective coatings.
Tungsten-carbide orifice for durability with medium-to-heavy paints.
0.021" size suited to higher-build coatings when matched with proper pump output.
High-pressure capability (up to 5000 psi) for contractor/industrial workflows.

Typical Applications

Interior/Exterior walls, ceilings, block, and masonry
Primers, acrylics, elastomerics (check manufacturer’s TDS for tip sizes)
Protective coatings where a wide, even fan is desired

Selection & Setup Tips

Match the tip guard/seat to the Silver Flat Tip family (do not mix with RAC-type guards).
Ensure your sprayer’s pressure rating meets or exceeds the tip’s requirements.
Start at lower pressure; increase only until tails disappear for a proper atomized fan.
Filter appropriately to reduce tip wear and improve finish quality.

Frequently Asked Questions

The 163821 (821) fits systems that use the Silver Flat Tip guard/seat and operate up to about 5000 psi. Check your gun’s guard part number and sprayer pressure rating. If you’re using RAC-type guards (RAC V/X), select the corresponding RAC tip family instead.

An 0.021" orifice is commonly used for medium-to-heavy materials such as acrylics, block fillers, and elastomerics—provided your pump can maintain adequate pressure/flow. Always consult the paint manufacturer’s TDS for recommended tip sizes.

Begin at the lowest pressure that produces a full fan with no “tails,” then adjust slightly upward as needed. Maintain clean filters, keep the gun at a consistent distance, and overlap passes by about 50% for even coverage. Replace worn tips to maintain pattern and output.