The Bobcat B621 is the largest orifice in the 60° group and the highest-output configuration in the Bobcat lineup at the 12” fan width — a 0.021” orifice delivering approximately 45 oz/min at 1000 PSI. It’s built for the thickest materials the Bobcat system handles: ultra-heavy industrial primers, very high-solid coatings, thick structural finishes, and heavy-body industrial materials that require maximum orifice size for consistent fluid delivery at production rates on large flat surfaces.

At ~45 oz/min, the B621 delivers the most fluid of any 60° Bobcat configuration — 64% more than the B615 at 0.015” and 25% more than the B619 at 0.019”, all at the same 12” fan width. This is the tip for operations where material viscosity has pushed past what the B619 handles optimally and a further orifice step is needed without changing fan angle or substrate coverage geometry.

CET recommends calling before ordering the B621 — at 0.021”, material and pump system compatibility are important to verify. Call or text 586-210-0555 with your material, pump, and current tip configuration and we’ll confirm before you order.

Fluid Tip

36-621

0.021” orifice · 60° angle · ~12” pattern

Largest orifice in the 60° Bobcat group — ~45 oz/min at 1000 PSI for the thickest materials on large flat panels. Maximum output in the 12” fan configuration. Field-replaceable tip. Confirm with CET before ordering.

Air Cap

26-101

AAA HVLP air cap · ≤18 PSI at handle

Same air cap as all Bobcat configurations. At 0.021” with very heavy materials, the AAA air assist provides meaningful atomization refinement over pure airless at comparable fluid pressure.

Gun Type

AAA

Air Assist Airless · 1500 PSI max

Requires AAA pump (e.g., Peak 14:1). Very heavy materials at 0.021” typically operate at higher fluid pressure. Start at 600–800 PSI and increase until atomization is consistent. Do not exceed 1500 PSI.

Repair Kits

When should I step up to B621 from B619?

Step up to B621 when your material at B619 (0.019”) shows inconsistent atomization or insufficient throughput that increasing fluid pressure alone doesn’t resolve. At ~45 oz/min vs ~36 oz/min, the difference is significant — this is a tip for the thickest practical coatings through the Bobcat system. Call or text 586-210-0555 before ordering; we’ll confirm this is the right step for your material.

What is the difference between B621 and B619?

Both use 60° for a 12” fan — same angle, same coverage width. B619 = 0.019” at ~36 oz/min. B621 = 0.021” at ~45 oz/min. The B621 delivers 25% more fluid per minute at the same pressure settings, for materials that are too viscous to flow consistently through the B619 at production rates.

Is there a 0.021” tip with a wider fan?

Yes — the B721 uses 0.021” at 70° for a 14” fan — same orifice, same ~45 oz/min delivery, wider pattern. If your panels are large enough that 14” coverage is more efficient, the B721 is the right choice. Call or text 586-210-0555 to confirm.

What fluid pressure is needed for very heavy materials at 0.021”?

Very heavy materials at 0.021” typically require 900–1300 PSI for consistent atomization. Start at 600–800 PSI and increase gradually until the pattern is fully formed and consistent. Do not exceed 1500 PSI. If atomization is inconsistent even at high pressure, call 586-210-0555 — it may indicate a pump or system issue rather than a tip issue.

What repair kit does the Bobcat use?

10-137 covers routine maintenance — all o-rings and the seat. 10-138 is the complete kit adding the air valve assembly and needle seal cartridge. CET stocks both for same-day shipment. Most in-stock orders ship same day — stocked at C.A. Technologies’ Colorado facility.

Where can I find the Bobcat parts manual?

The full parts manual with exploded diagram, tip flow chart, and all replacement part numbers is available via the download button below. CET includes documentation with every order.