DKO Male x BSP Male Adapter

At the heart of every high-performance agricultural machine or road implement, hydraulic system integrity is non-negotiable. Any connection failure can lead to costly downtime, productivity losses, and safety risks.

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This is where Helesul DKO hydraulic adapters (Double Cone O-ring) stand out as the strategic choice for manufacturers and operators who demand uncompromising reliability, delivering a robust solution built on versatility, superior sealing, and global compatibility.

Technical Details
Applications
BSP Size Chart
Dimensions Table (DKO)

Technical Details

Standards met: ISO 8434-6;
Maximum operating pressure: 420 bar (6,000 PSI);
Working temperature: -30°C to +120°C;
Body material: carbon steel;
Surface finish: trivalent zinc plating;
O-ring: NBR 90 Shore A;
Certification: ISO 9001.

Applications

The versatility of BSP adapters enables their use in critical connection points across a wide range of equipment, where performance cannot be compromised.

In Agricultural Implements

In self-propelled sprayer lines, precision is everything. BSPP adapters ensure leak-proof connections between the manifold and hoses, preventing drips that lead to pesticide waste and uneven field application.

In high-precision planters, they deliver a consistent oil flow to the hydraulic motors driving the seed metering units — a critical factor for maintaining the desired plant stand throughout extended planting operations.

In Road and Transport Implements

In hydraulic dump body tipping systems, BSPT models prove their durability by withstanding the extreme pressures generated when lifting heavy loads, ensuring system stability cycle after cycle.

For the actuation of lowboy ramps, 90° elbow adapters optimize hose routing in tight spaces, shielding the hydraulic circuit from impact and abrasion damage.

BSP Size Chart

BSP
Nominal Size	External Thread (d) [mm]	Internal Thread (D) [mm]
G 1/8"-28	9,7	8,6
G 1/4"-19	13,2	11,4
G 3/8"-19	16,7	15
G 1/2"-14	21	18,6
G 5/8"-14	22,9	20,6
G 3/4"-14	26,4	24,1
G 1"-11	33,3	30,3
G 1.1/4"-11	41,9	39
G 1.1/2"-11	47,8	44,9
G 2"-11	59,6	56,7

Dimensions Table (DKO)

Nominal Sizer	Tube [mm]		External Thread (d) [mm]	Internal Thread (D) [mm]
Nominal Sizer	Tube [mm]		External Thread (d) [mm]	Internal Thread (D) [mm]
	Light Series	Heavy Series
M12x1,5	6	-	12	10,4
M14x1,5	8	6	14	12,4
M16x1,5	10	8	16	14,4
M18x1,5	12	10	18	16,4
M20x1,5	-	12	20	18,4
M22x1,5	15	14	22	20,4
M24x1,5	-	16	24	22,4
M26x1,5	18	-	26	24,4
M30x2	22	20	30	27,8
M36x2	28	25	36	33,8
M42x2	-	30	42	39,8
M45x2	35	-	45	42,8
M52x2	45	38	52	49,8

FREQUENTLY ASKED QUESTIONS

Is DKO compatible with my current equipment?

In general, yes, thanks to the metric and UNF options and the use of adapters when necessary. Check the thread/port pair and the machine pattern.

What is the practical gain in the field?

Fewer microleaks, faster assembly and less rework, which translates into more available machines and lower fluid consumption throughout the life cycle.

What is the difference between DKO adapters and conventional JIC adapters?

DKO (Double Cone O-ring) adapters use a double O-ring sealing system, while traditional JICs have only one sealing cone. The DKO system reduces leaks by up to 98% and offers a useful life 3 times longer, with tolerance to multiple assembly and disassembly without loss of efficiency.

What is the main difference between BSPP and BSPT?

The BSPP (Parallel) thread is cylindrical and its sealing depends on an O-ring housed in a recess. It is ideal for systems that require frequent assembly and disassembly. The BSPT (Conical) thread, in turn, seals due to the tightening and deformation of the threads themselves (metal-to-metal), being the preferred choice for high pressure applications and permanent installations under continuous vibration.

Can I use BSP adapters with JIC or SAE connections?

No. There are three completely different thread standards (BSP 55°, JIC 37°, SAE 45°). Mixing standards results in unsafe connections, leaks and permanent damage to components. Always check the standard of your system before any replacement. Although conversion adapters exist, they can introduce restriction points into the flow.

What maintenance is required for a BSP adapter?

With correct installation, a BSP adapter can last more than a decade. Maintenance is simple: biannual visual inspections in search of leaks or corrosion, external cleaning and, in the case of BSPP, changing the O-ring whenever the connection is broken. Avoid over-tightening, which is one of the main causes of thread failure.

PTFE tape or liquid sealant?

Use PTFE tape if the connection will be retightened periodically. Prefer anaerobic sealant for permanent sealing and greater vibration resistance.

In agricultural hydraulic circuits, sealing failures can bring a harvester to a complete stop in the middle of harvest season, leading to high maintenance costs and significant operational losses. The dual O-ring sealing system helps eliminate leaks even under intense vibration and pressure spikes, reducing unplanned downtime and fluid loss by up to 95% when installed according to specification.

The self-centering 24° cone speeds up assembly by up to 40% compared to conventional fittings, reduces rework, and improves torque repeatability.

Helesul DKO (Double Cone O-ring) hydraulic adapters are engineered for high-reliability sealing in high-pressure hydraulic systems, combining a self-centering 24° cone and O-ring for consistent performance in agricultural machinery and on-highway applications.

Built for demanding environments, they minimize leaks, simplify installation, and maximize equipment uptime — even under vibration, high-cycle loads, and harsh operating conditions.

All Helesul hydraulic adapters are manufactured in compliance with ISO, SAE, and DIN standards, ensuring full interchangeability, safety, and predictable field performance.

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