Using the wrong spray tip is one of the most expensive mistakes a painter can make — and most contractors don't realise they're doing it. A worn or incorrectly sized tip wastes paint, destroys finish quality, overworks the pump, and on a full production day can cost $300 or more in wasted material and labour compared to using the right tip at the correct pressure. This guide covers everything: how to decode Graco's three-digit tip numbering system, which tip to use for every material and surface, how to know when your tip is worn out, and the exact RAC X tip sizes you should have in your bag right now.
Every Graco RAC X spray tip has a three-digit code printed on it. Those three digits contain two pieces of critical information: how wide the spray fan will be, and how much paint will flow through the orifice on each pass. Once you understand the code, choosing the right tip becomes straightforward.
Always spray at the lowest pressure that produces a complete, even fan with no tailing at the edges. Start low, increase in small increments until the fan is clean. Running excessive pressure causes 3x more tip wear, more overspray, and higher pump wear — for zero improvement in finish quality.
Tip selection comes down to two variables: the viscosity of the material (how thick it is) and the size of the surface you're covering. Thick materials need larger orifices to flow. Larger surfaces need wider fans for production speed. Here's the right tip for every common job.
Standard interior latex flat, eggshell, or satin on open wall and ceiling surfaces. The 515 and 517 are the industry standard for good reason — 10-inch fan, moderate orifice, consistent atomisation across the full range of residential latex.
Exterior latex requires slightly more flow than interior because the material is typically higher-build and being applied over larger, more open surfaces. The 517 and 519 are the workhorses of exterior residential painting.
Fine finish work requires narrower fans and smaller orifices for better control, reduced overspray, and finer atomisation. The 410 and 412 are the standard for trim and cabinet work where clean edges matter more than production speed.
Deck stains and penetrating oil stains are thin materials that require smaller orifice sizes to prevent runs and sags. The 413 and 415 are the standard picks — narrower fan for control along fence rails, small orifice for thin stain viscosity.
Elastomeric coatings are the thickest standard painting materials and require the largest orifice sizes. These coatings also demand maximum pressure and — critically — a machine with sufficient flow capacity. Running a 621 or 625 on a machine rated for .023 max tip will stall the motor.
Always check your sprayer's maximum tip size before spraying heavy coatings. The Graco 395 PC is rated for a maximum .023" orifice (tip code x23). Elastomerics typically require .021–.025. If your machine is a 395 PC and you're spraying elastomeric, you're working at the limit — use a 521, not a 625. Running an oversized tip causes the motor to cycle continuously, overheats the machine, and destroys packings prematurely.
Tip wear is gradual and deceptive. You won't notice it happening — but a worn tip is costing you money every single day you use it. Graco's documented data shows that a contractor using a worn tip versus a fresh tip can waste over $300 per day in paint and labour without realising it.
As a tip wears, two things happen simultaneously: the orifice grows (more paint per pass than intended) and the fan width shrinks (less area covered per pass). You end up applying more material over less surface — meaning more cost per square foot, heavier build than specified, and more passes needed to keep up with the job.
Graco's documented replacement guideline: replace any spray tip once the fan width has collapsed 25% from its original size.
Test it: spray a test pattern on cardboard from 12 inches away. Measure the fan width. A fresh 515 produces a 10-inch fan. When that fan measures 7.5 inches or less, the tip is worn. The tip that replaced 6 months ago is probably already there if you've been running it in production. Keep a fresh tip in your bag to swap and compare — if the pattern improves immediately on the fresh tip, the old one was the problem.
Most spray pattern problems that contractors blame on the pump or the paint are actually tip problems. Here's how to diagnose each symptom correctly before spending time and money on the wrong repair.
What it looks like: The fan pattern has pronounced cat-ear edges — heavier coverage at the extremities, lighter in the centre. Lines or "tails" at the top and bottom of the fan.
Cause and fix: Pressure too low for the material viscosity. Increase pressure incrementally until the tails disappear. If tails persist at maximum pressure, the tip orifice is oval from wear — replace the tip. If one tail is heavier than the other, the orifice is partially blocked on one side — reverse the tip and clear the clog first.
Cause and fix: Worn tip (primary cause) or pressure too low. Test by increasing pressure first. If fan remains narrow at maximum pressure, the tip is worn — replace it. This symptom combined with higher-than-normal paint consumption is a reliable indicator of tip wear.
Cause and fix: Almost always the gun filter, not the tip. Remove and replace the gun filter before swapping the tip. If sputtering continues after a fresh gun filter, then inspect the tip orifice for partial blockage. Also check for air in the suction line — intermittent air pockets produce irregular spitting that mimics a tip problem.
Cause and fix: Too much material per pass. Either the tip orifice is larger than intended (worn tip), pressure is too high, you're moving the gun too slowly, or the tip size is simply too large for the material viscosity. Try dropping one orifice size (515 instead of 517) or slowing your pressure before blaming technique.
When a tip clogs mid-job, reverse it 180° to the unclog position, point into a bucket, and pull the trigger for one second to blast the clog out. Never push a pin, wire, or nail into the orifice — even one scratch destroys the precision edge that creates a clean fan pattern. If reversing doesn't clear it, soak the tip in water or mineral spirits for 5 minutes and use a soft brush only.
Graco's RAC X SwitchTip is the current professional standard — tungsten carbide orifice, reversible for in-field clog clearing, compatible with the RAC X tip guard. All tips below are genuine OEM Graco, shipping same day from Houston on qualifying orders before 1pm CST.
The most-used tip in residential painting. Works on 99% of interior latex flat, eggshell, and satin. Compatible with all Graco contractor machines and Magnum X7/ProX. Tungsten carbide orifice for maximum wear life. Reverses for instant clog clearing mid-job.
Step up from the 515 when you need more flow. Standard exterior residential painting tip — siding, soffit, fascia. Also the go-to for thicker interior latex that the 515 struggles to atomise cleanly.
Shop RAC X 517The trim contractor's standard. Narrow 8" fan for controlled application on mouldings and doors. Fine .010" orifice atomises enamels and semi-gloss without runs on vertical surfaces.
Shop RAC X 410The standard for fence staining. Thin stain materials flow freely through the .013" orifice without runs. 8" fan gives good control along fence rails and between boards.
Shop RAC X 413Maximum coverage rate on open commercial ceilings and large interior walls. Requires a 490 PC or larger machine to maintain clean fan at .019" orifice. Not for 395-class machines.
Shop RAC X 619The heaviest tip most 490/495 PC machines can support (.023 max). The right choice for elastomeric stucco and masonry coatings on mid-range contractor machines without going over the rated max.
Shop RAC X 521The finest finish tip in the standard range. 6" fan for precise control on narrow trim, spindles, and intricate millwork. Thin varnishes and lacquers need this orifice size — a larger tip will cause immediate runs.
Shop RAC X 310Our team knows Graco tips inside and out. Call us Mon–Fri 8am–4pm CST with your machine model and the material you're spraying — we'll tell you the right tip in 60 seconds. All genuine Graco RAC X tips ship same day on qualifying orders before 1pm CST from Houston, TX.
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