Straight Adapter Female DKO x Male BSP

At the core 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 (Double Cone O-ring) hydraulic adapters stand out as the strategic choice for manufacturers and operators who refuse to compromise on reliability — delivering a robust solution built on versatility, superior sealing, and global compatibility.

Technical Details
Applications
Size Chart (BSP)
Dimensions Table (DKO)

Technical Details

Standards: DIN 2353 (L, S) / ISO 8434-1;
Outer diameters: 6 mm – 42 mm (metric tubes);
Maximum operating pressure: 420 bar (6,000 PSI);
Operating temperature: -40°C to +120°C;
Body material: carbon steel;
Surface finish: trivalent zinc plating;
O-ring: NBR 90 Shore A;
Certification: ISO 9001.

Applications

Agricultural harvesters and sprayers

In articulated boom circuits and hydraulic control systems exposed to constant vibration and uneven terrain, DKO hydraulic adapters maintain stable sealing, help prevent oil contamination of the soil, and reduce corrective maintenance. The dual-sealing design withstands rapid cycles and pressure spikes typical of field maneuvers, preserving system efficiency.

Tractors and soil preparation implements

In cylinders for reversible plows, leveling harrows, and subsoilers, the 24° profile with O-ring provides a robust connection against impacts and cyclic loads, ensuring precise actuation response. Torque repeatability reduces loosening and sustains productivity throughout long working hours.

Dump bodies and road trucks

During the tipping of dump bodies and platforms, DKO connections support safe, continuous operation by maintaining a complete seal throughout repetitive cycles. Their high-torque resistance helps preserve assembly integrity after maintenance and routine inspections in road fleets.

Brush cutters and side sweepers

Exposed to dust, debris, and temperature fluctuations, articulated arm systems benefit from the resilient sealing of the O-ring and tapered seat, reducing micro-leaks and maintaining stable pressure. This extends maintenance intervals and optimizes equipment availability.

Presses and compactors

In machines operating under sustained high pressure, the dual seal prevents gradual fluid losses that compromise force and speed. The result is a more consistent cycle, lower oil consumption, and improved hourly output, especially in continuous industrial operations.

Size Chart (BSP)

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, seal failures can halt a harvester during peak harvest season and drive up maintenance costs. The dual sealing system with O-ring effectively eliminates leaks even under intense vibration and pressure spikes, reducing unplanned downtime and fluid losses by up to 95% when installed per specifications.

The 24° self-centering cone speeds up assembly by up to 40% compared to conventional connections, minimizes rework, and enhances torque repeatability.

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

With robust construction, they cut leaks, simplify assembly, and boost equipment uptime even under vibration, intense cycles, and harsh environments.

All Helesul hydraulic adapters are manufactured to ISO, SAE, and DIN standards, ensuring interchangeability, safety, and predictable field performance.

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