Wave Soldering Flux Nozzle ST-5 / ST-6 | LUMINA (Fusoseiki) Japan

I. Core Parameters (ST-5 / ST-6)

Material: Brass (Standard) / Stainless Steel Wetted Parts (STA-5/6) / All Stainless Steel (STS-5/6)

Nozzle Diameter: 0.5 / 1.0 / 1.3 / 2.0 mm (Commonly 0.5, 1.0)

Connection: G1/8 Thread (Gas / Liquid)

Spray Pattern: Circular / Fan-Shaped (Adjustable)

Spray Width: 200–400 mm (Distance 200–300 mm)

Liquid Flow Rate: 0–62 mL/min (0.5 mL/min) (0.5 mm nozzle diameter)
Average droplet size: ≈28 μm (0.5 mm)
Weight: ≈280 g
II. Differences between ST-5 and ST-6 (Commonly used in wave soldering)

ST-5 (Single air intake): Simple structure, low cost; non-adjustable atomization intensity/particle size; suitable for stable operating conditions and low budget limits.

ST-6 (Dual air intake, low-pressure atomization): Independently adjustable atomizing gas/liquid pressure, finer droplets, excellent anti-drip properties; suitable for high-precision wave soldering, selective wave soldering, rosin/flux spraying.

III. Typical Applications

Wave soldering: Flux (rosin) spraying, uniform atomization, saving consumables.

Selective wave soldering: 0.5 mm nozzle diameter, precise micro-spraying.

Others: Water spraying for vacuum forming machines, mold release agent for die casting machines, printing/screen printing oil, steel plate cooling/lubrication.

IV. Model Naming (Example)

ST-6-0.5: ST-6 body, 0.5 mm Bore Diameter (Most Commonly Used for Wave Soldering)

STA-6-1.0: Stainless steel wetted parts, 1.0 mm bore diameter (corrosion resistant)

V. Selection Considerations
For wave soldering, ST-6 (dual air intake) is preferred for finer atomization and better drip prevention.
Break Diameter: 0.5 mm (micro-volume) / 1.0 mm (standard), choose larger diameter for higher viscosity.
Material: Brass for ordinary fluxes; STA/STS stainless steel for no-clean/corrosive fluxes.

I. Japanese Original Manufacturers (Standard/Original)

SUNEAST Models: FM-350, FM-450, FM-600, SUNFLOW Series
Description: Original standard ST-6 (0.5/1.0mm), direct replacement

JT Models: WS-350, WS-450, WS-600, NS-400
Description: Original nozzles are fully interchangeable with ST-6, commonly ST-6-1.0

KAITAI Models: MS-350, MS-450, Lead-Free Wave Soldering Series
Description: ST-5/ST-6 direct installation, replacement for original brass nozzles

MEIJI Models: A-100, A-200 Spray Systems
Description: ST-6 can replace A-100, finer atomization, better anti-drip

II. Mainstream Domestic Brands (Compatible/Replacement)

KLONW COMWIN: WS-350, WS-450, Dual Wave Soldering Series
HX: WS-350, WS-450, Lead-Free Environmentally Friendly Series
CKT: KT-350, KT-450, Economic Wave Soldering
DEZHOU: DZ-350, DZ-450, Selective Wave Soldering All-in-One Model
Others: Standard wave soldering machines from brands like Sitech, Yitong, Huatai, and Chuangmeiwei, G1/8 interface universal
III. Taiwanese Brands (Compatible/Replacement)
JT (Taiwan), SUNEAST (Taiwan), Baoli, Qibao
Note: Taiwanese machines mostly imitate Japanese designs; ST-5/ST-6 are direct replacements; commonly used nozzle diameters are 0.5/1.0mm.
IV. Selective Wave Soldering (Partially Compatible)
ERSA (Germany), QUICK, ZSW
Note: Selective soldering mostly uses dedicated precision nozzles; ST-6 can be used for offline/simple selective soldering, precise spraying (0.5mm). V. Recommended Compatible Atomizers (by Model)
Standard Wave Soldering (350/450 type): ST-6-1.0mm (most universal, fine atomization, moderate flow)
Small/Precision Wave Soldering: ST-6-0.5mm (micro-spraying, flux-saving)
Older Models/Low Cost: ST-5-1.0mm (single air inlet, simple structure, low price)
Corrosive No-Cleaning Flux: STA-6 (wetted stainless steel)/STS-6 (all stainless steel)
VI. Installation and Replacement Points
Interface: G1/8 (1 point) thread, universal gas/liquid interface
Pressure: Atomizing gas 0.1–0.3MPa, liquid 0.05–0.2MPa (low-pressure atomization, anti-drip)
Spray Pattern: Circular (standard)/Fan (adjustable), spray width 200–400mm (distance 250mm)