The KZD quick coupling is a brass, medium-to-high pressure coupling for pneumatic and hydraulic systems. It connects and disconnects fluid lines fast without leaks. Ruihua Hardware supplies KZD couplings for equipment makers, maintenance teams and fluid power distributors who need ISO-standard parts at a practical price.
What Is the KZD Quick Coupling?
KZD is a double shut-off quick coupling. The socket and plug close automatically when disconnected. When connected, both valves open to let fluid flow. This design stops drips and keeps operators and equipment clean.
Key Features
Leak-Free Double Shut-Off Valves
Poppet valves in the socket and plug seal the line when uncoupled. No spillage means safer maintenance and less wasted fluid.
Brass Bar Stock Construction
The body is machined from solid brass bar stock. Key parts are surface hardened for longer life and repeated connection cycles.
Ball-Lock Design
A steel ball-lock mechanism holds the mating halves together. The connection resists vibration and pressure spikes common in mobile and industrial hydraulics.
Broad Size Range
Sizes run from 1/8" to 2". Rated pressure reaches 1000 PSI on smaller sizes, with flow from 3 to 150 GPM. Operating temperature is -20°C to +120°C with standard NBR seals.
Dimensions & Part Numbers
The drawing below shows the KZD socket and plug with full dimensions and part numbers. Use it to match the right size to your hydraulic or pneumatic installation.
KZD socket and plug dimensions with part numbers (ISO sizes 5–50).
Note: KZD-01 to KZD-08 sizes meet ISO 7241-B. Larger sizes follow the same body design but are not covered by the ISO 7241-B interchange standard.
Specifications at a Glance
Item
Value
Material
Brass
Body sizes
1/8" – 2"
Max rated pressure
Up to 1000 PSI
Rated flow
3 – 150 GPM
Temperature range
-20°C to +120°C
Standard seal
NBR
Standard
ISO 7241-B
Applications
Construction and mobile hydraulic machinery
Industrial fluid transfer lines
Agricultural equipment
Mold cooling and heating circuits
Chemical, water and gas lines
Equipment service and maintenance
International Compatibility
KZD couplings conform to ISO 7241-B and are dimensionally interchangeable with major global series:
Ruihua Hardware focuses on industrial fittings and hydraulic quick couplings. We check dimensions, pressure ratings and thread accuracy before shipment. Our team can match the right coupling to your system and offer technical drawings on request.
Frequently Asked Questions
What makes Ruihua Hardware KZD couplings reliable?
Ruihua Hardware KZD couplings use brass bar stock, surface-hardened key parts and double shut-off poppet valves. The ball-lock design keeps the connection firm under pressure and vibration.
Are KZD couplings interchangeable with Parker or Faster?
Yes. KZD couplings meet ISO 7241-B and are interchangeable with Parker 60 Series, Faster HNV Series, Aeroquip FD45 Series and Hansen HK Series.
What fluids can KZD couplings handle?
KZD couplings work with hydraulic oil, chemicals, water, steam and some gases. Standard seals are NBR. Contact Ruihua Hardware for special seal materials.
What sizes are available?
KZD couplings come in sizes from 1/8 inch to 2 inch. Rated pressure reaches up to 1000 PSI and flow ranges from 3 to 150 GPM depending on size.
Get a Quote — Ruihua Hardware
Need pricing, a size recommendation, or a delivery estimate? Reach out — we'll get back to you fast.
Lynn Liu is a Senior Foreign Trade Specialist at Ruihua Hardware with over 10 years of experience in hydraulic fittings export. She helps global buyers source reliable, cost-effective, and application-ready hydraulic connection solutions from China.
