RK Threaded Hydraulic Quick Couplings | High Pressure Hydraulic Couplings Manufacturer
Discover RK Threaded Hydraulic Quick Couplings designed for high-pressure hydraulic systems. Flat face design, leak-free performance, ISO compliant, OEM customization, and global supply from HL Fluid.
Characteristics
RK Threaded Hydraulic Quick Couplings are developed for severe hydraulic applications with high pressure, that demand a safe, leak-proof connection. With a combination of the threaded locking mechanism and flat face valve technology, RK Series prevents inadvertent disconnection, reduce fluid loss and contamination during connection and disconnection.
These hydraulic quick couplings are made from high-strength alloy steel with an advanced heat treat process and high precision machining that offer superior durability, corrosion resistance, and long service life in even the harshest environment. Applications include construction machinery, farming and forestry equipment, mining, oil and gas, road maintenance, and stone processing machinery, mobile hydraulics, and factory automation, etc. hence, makes a perfect seal with the function of thread in the unrestricted space.
As a professional hydraulic quick coupling manufacturer, HL Fluid can also provide OEM and customized products for different thread standards, pressure ratings, and application demands.
Specifications
Materials |
zn/zn-ni plated carbon steel body |
Seals |
standard in nitrile NBR. On request FKM&EPDM seals |
Back-up ring |
PTFE |
Working temp |
with standard seals -25°+125° |
HL |
ISO |
L1 |
L2 |
L3 |
D |
S1 |
S2 |
S3 |
T |
T1 |
COD(F) |
COD(M) |
03 |
10 |
110.5 |
65.5 |
58.3 |
39 |
22 |
32 |
36 |
3/8’’BSP |
M32*3 |
RK-03F-BSP |
RK-03M-BSP |
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M16*1.5 |
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M18*1.5 |
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04 |
12.5 |
122.8 |
74.5 |
67 |
54 |
24 |
46 |
41 |
1/2’’BSP |
M36*3 |
RK-04F-BSP |
RK-04M-BSP |
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M20*1.5 |
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M22*1.5 |
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06 |
20 |
137.5 |
81 |
77 |
66 |
32 |
60 |
55 |
3/4’’BSP |
M48*3 |
RK-06F-BSP |
RK-06M-BSP |
08 |
25 |
164.5 |
105 |
90 |
64 |
41 |
55 |
55 |
1’’BSP |
M54*4 |
RK-08F-BSP |
RK-08M-BSP |
Technical Data
Nominal Size |
Max.Working Pressure |
Rated flow |
Max flow rate |
Min.Burst Pressure |
Fluid Spillage |
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Male |
Female |
Coupled |
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HL |
ISO |
（bar） |
(l/m) |
(l/m) |
(bar) |
(bar) |
(bar) |
(cc) |
03 |
10 |
420 |
23 |
46 |
1300 |
1400 |
2500 |
0.02 |
04 |
12.5 |
420 |
45 |
90 |
1300 |
1000 |
1500 |
0.02 |
06 |
20 |
420 |
106 |
150 |
1100 |
1300 |
1300 |
0.06 |
08 |
25 |
350 |
189 |
240 |
1100 |
1100 |
1300 |
0.10 |
Accessories | ||||
HL |
ISO |
Female Dust Plug |
Male Dust Cap |
Material |
03 |
10 |
RK-03-SDP |
RK-03-SDC |
Plastic |
04 |
12.5 |
RK-04-SDP |
RK-04-SDC |
Plastic |
06 |
20 |
RK-06-SDP |
RK-06-SDC |
Plastic |
08 |
25 |
RK-08-SDP |
RK-08-SDC |
Plastic |
Why Choose RK Threaded Hydraulic Quick Couplings?
The RK series was specifically developed for use in heavy duty hydraulics applications in which regular QCs cannot offer adequate safety and sealing.
SECURE THREADED CONNECTION
Our spring lock and plug lock connectors include stainless steel lock screws that secure the connection. The screw-connect locking system eliminates accidental disconnection due to vibration, shock or pressure pulsations.
Flat Face Valve Design
Flat face makes less oil spill-out during connection and disconnection, and dust and contaminant are kept from flowing into hydraulic system.
High Pressure Performance
Designed for demanding hydraulic applications with excellent pressure resistance and reliable sealing performance under continuous operation.
Corrosion Resistance
Made from high quality alloy steel with zinc plating, or optional surface treatments for the life extension under aggressive environment.
Low Maintenance
High-quality sealing materials reduce wear and leakage, helping lower maintenance costs and improve equipment uptime.
OEM & Custom Manufacturing
Custom thread types, sealing materials, pressure ratings, logos, and packaging are available to meet customer requirements.
OEM & Customization
Selection and maintenance recommendations
RK Threaded Hydraulic Quick Couplings are widely used in:
✅Construction Machinery
✅Agricultural Equipment
✅Mining Machinery
✅Oil & Gas Equipment
✅Mobile Hydraulic Systems
✅Industrial Hydraulic Equipment
✅Forestry Machinery
✅Railway Maintenance Equipment
✅Marine Hydraulic Systems
✅Heavy Industrial Machinery
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