Running a thin adhesive through a needle sized for a thicker one creates pressure spikes that show up as inconsistent bead width and unpredictable break-off. The Incure Sniper SN-18 exists to remove that restriction entirely.
The Widest Bore in the Sniper Range
At 1.039 mm inner diameter, the SN-18 is the largest bore Incure manufactures across the entire Sniper dispensing needle lineup. Where SN-19 through SN-30 target progressively finer bead placement for narrower or more viscous deposits, the SN-18 is built for the opposite priority: the highest flow rate and lowest driving pressure available in the range. Low-viscosity UV adhesives, cyanoacrylates, aqueous sealants, and thin coatings pass through the SN-18 bore without the pressure spikes that build up in narrower gauges — a real problem when a thin material is forced through a needle sized for something thicker, since elevated pump pressure on a low-viscosity fluid tends to produce inconsistent bead geometry rather than a clean, controlled line.
Running at the lowest achievable driving pressure has a secondary benefit worth noting on high-speed dispensing lines: lower pump pressure generally means faster pressure-response time when the dispenser opens and closes, which supports tighter dot and dash placement accuracy at high cycle rates even though the SN-18’s own bore is sized for volume rather than precision.
If a current process is running at elevated pump pressure on a genuinely thin adhesive through a finer gauge, that’s usually a sign the gauge is undersized for the material — the SN-18 resolves that restriction by opening the flow path to its maximum rather than fighting the pressure with process tuning.
Non-Ferrous Construction for Sensitive Assemblies
Steel dispensing needles shed ferrous particles over time, and those particles are a real contamination risk on magnetic sensors, HDD read/write assemblies, and precision optical alignment components — problems that have nothing to do with the adhesive itself but everything to do with the needle material. The SN-18 is machined from phosphor bronze: non-magnetic, non-ferrous, and chemically inert to UV adhesives, cyanoacrylates, and common electronics-assembly solvents. No magnetic particle sweep is needed between dispensing operations on sensitive assemblies.
That chemical inertness matters beyond just magnetic sensor work — phosphor bronze doesn’t react with or degrade from prolonged exposure to the acrylate and cyanoacrylate chemistries common in UV-cure and instant-bond formulations, which keeps the needle’s bore geometry and dispensing characteristics consistent over its service life rather than degrading with repeated exposure.
Email Us if elevated pump pressure on a low-viscosity adhesive is currently producing inconsistent bead geometry.
Fit and Identification
The pink PP Luer Lock hub seats directly on any standard 1cc to 30cc dispensing barrel with no adapters required — pink is the industry-standard color code for this bore size, letting operators confirm gauge identity at a glance during line changeovers rather than measuring the tip or checking a label.
Specifications and Application Fit
The SN-18 has a 1.240 mm outer diameter, an 18 mm nominal overall length, and ships in packs of 10. It’s available in both Phosphor Bronze and Nickel Silver cannula material, with a full coating lineup: No Coating, Electroless Nickel, Nickel PTFE, Nickel Polymer Type SLK, and Parylene Type C. Recommended materials are low-viscosity UV adhesives under 1,000 cP, cyanoacrylates, aqueous sealants, thin conformal coatings, and flux — spanning electronics assembly, optical bonding, and semiconductor packaging.
Where the SN-18 Fits in the Sniper Range
The SN-18 anchors the wide end of a range that runs all the way down to 0.234 mm at the SN-30, and even finer in the specialized nickel silver trio below that. For finer bead placement or controlled dispensing of medium-to-high-viscosity materials, the sequence runs SN-19 (0.859 mm), SN-20 (0.681 mm), SN-21 (0.610 mm), SN-23 (0.564 mm), SN-25 (0.437 mm), SN-27 (0.335 mm), and SN-30 (0.234 mm) — each narrower gauge trading flow rate for placement precision or the backpressure needed to handle a more viscous material cleanly.
Choosing the SN-18 over a finer gauge should be a viscosity-and-flow-rate decision, not a default: if a bead is coming out wider than the joint requires, or if a finer gauge would still flow the material without excess pump pressure, one of the narrower options in the range likely fits better. A quick diagnostic on an existing line: if pump pressure is already climbing toward the dispenser’s upper limit just to maintain flow on a thin adhesive, that’s a reliable sign the current gauge is undersized rather than a signal to push the pressure setting any higher.
See Incure’s full Sniper precision dispensing needle range for the complete gauge, alloy, and coating comparison. The SN-18 is a common match for Incure Uni-Weld Multi-Substrates Bonder grades at the lower end of that line’s viscosity range, and for fast-flowing UV formulations from the Ultra-Illumina UV conformal coatings line. Contact Our Team to confirm gauge selection for a specific low-viscosity dispensing application.
Visit www.incurelab.com for more information.