20411 Metric Female 24-Degree Cone O-Ring LIGHT-Series Hydraulic Hose Fittings (Swivel Nut)

Metric female 24-degree cone O-ring hydraulic hose fittings are the swivel-nut end of the O-ring cone system, the DIN 3865 style joint that seals with an O-ring in the cone face instead of relying on bare metal alone. The 20411 light-series (L.T.) female carries its O-ring ready in the 24-degree cone seat, with the O-ring size listed on every part number, so the hose end arrives complete for connections onto 24-degree cone male studs. The series covers 24 part numbers from DN6 (-04) to DN40 (-24), female metric threads M12x1.5 to M52x2 mapping to DIN light-series tube sizes from 6 to 42 mm, designed for wire-braided hose. If your machine connects hoses onto 24-degree cone O-ring (DKOS-type) male studs, this page gives you the full reference: dimensions, O-ring sizes, part numbers and OEM options.

Why Choose These 24-Degree Cone O-Ring Fittings

• O-ring already fitted in the cone seat. The 24-degree cone carries its O-ring, and the O-ring size is printed on each part number – no separate seal shopping, no missing-seal surprises at the bench.
• The forgiving cone joint. The O-ring does the primary sealing while the cone gives metal backup, which tolerates small surface imperfections and light scoring far better than a bare metal cone joint.
• Light-series (L.T.) thread schedule. DIN light-series threads, M12x1.5 for a 6 mm tube class up to M52x2 for 42 mm, matching light-series machine ports and drawings.
• Swivel nut that turns freely. The nut rotates on the hose tail, so the connection tightens onto the cone stud without twisting the hose.
• OEM-ready. Laser marking, custom plating, material test reports and batch traceability, with replacement O-rings available.

Standards and traceability. Threads are ISO 724 metric threads. The sealing geometry follows the 24-degree cone with O-ring per DIN 3865, within the ISO 12151 hose-fitting family – the O-ring cone configuration widely known in the trade as the DKOS-type joint. Fittings are designed to pair with wire-braided hose built to EN 853 1SN/2SN or SAE 100 R1AT/R2AT performance classes. Dimensional inspection reports and material test certificates are available for OEM gate checks.

O-Ring Cone vs Plain Metal Cone: Which Joint Is Yours?

Two versions of the 24-degree cone joint exist in the DIN/ISO world, and they look similar at a glance:

• Plain metal cone (metal-to-metal). The cone faces seal on bare metal. It needs clean, undamaged surfaces and correct torque. The 20511C-type female is the metal-cone construction.
• Cone with O-ring (DIN 3865 / DKOS-type). An O-ring sits in the cone face and does the primary sealing, with the metal cone as backup. It tolerates surface wear better and holds a seal under vibration and low-pressure conditions where a bare metal joint may weep.

This 20411 series is the O-ring version, in the light thread schedule. The male stud it connects to is a 24-degree cone male in the same DIN cone family – and because the female carries the O-ring, the joint is complete the moment the nut is torqued onto the cone.

If you are not sure whether your male stud is designed for an O-ring-carrying female or a plain metal cone female, send a photo of the stud and the old nut – the presence of an O-ring groove or a flat clean cone tip tells us which version you need.

What does the O-ring column in the table mean?

Every part number lists its O-ring size, for example O12.0X2.0 for the M22x1.5 sizes. Replacement O-rings are available separately, so a lost seal never forces you to scrap a fitting. Standard O-rings are NBR for mineral oils; FKM seals are available for higher temperatures and aggressive fluids.

20411 vs 20411-T: the nut construction question

As on the other female swivel series, the -T suffix marks the alternate nut retention construction shown on the manufacturer drawing. Both constructions carry the same O-ring-equipped cone seat. Order the exact part number – with or without T – as printed on your drawing or the old fitting, and we will confirm the construction before dispatch.

20411 Series Technical Specifications

Materials and processing

• Body material options: high-strength carbon steel (20#/35#/45# grades, cold-formed or machined) as standard; stainless steel 304 or 316L available for corrosive or wash-down environments.
• Surface treatment: zinc plating as standard; yellow, white or black zinc, zinc-nickel and Dacromet coating available for higher salt-spray requirements.
• Heat treatment: hardness and case depth are controlled per drawing to keep the thread, the cone seat and the nut fatigue-resistant; typical surface hardness range HRC 20-28 (confirm the exact code on your drawing or PO).
• O-ring: NBR as standard for mineral oils; FKM available for higher temperatures and aggressive fluids. O-ring sizes per part number in the table.

Full dimension and part number table

All linear dimensions are in millimeters. E = thread, DN = hose bore, Tube O.D. = the DIN light-series tube size sharing this thread and cone geometry, O-ring = the seal size supplied with the fitting (as printed in the catalog), A and C = lengths per the supplier drawing, S2 = swivel nut hex across flats. Rows ending in T use the alternate nut retention construction.

Full dimensioned CAD drawings are available on request so your engineers can verify every length, the cone seat and the O-ring groove before you commit a batch.

Working pressure: the honest answer engineers need

A crimp hose assembly fails at its weakest link, so the rating of a 20411 fitting depends on the hose you pair it with and the crimp quality. Wire-braided hydraulic hose in this size range typically operates between roughly 80 and 400 bar depending on bore size and construction (1SN or 2SN). Send us your hose specification and we will confirm the working pressure, burst margin and the recommended ferrule for your exact hose brand – the check is free and takes one message. For derating at elevated temperature, follow the hose manufacturer’s pressure-temperature curve, because the rubber cover and tube lose capacity above about +100°C, and check the O-ring material limit for your fluid temperature.

Which Fitting Series Do You Need: 20411 (Braided) or 20412 (Spiral)?

The part number changes with the hose construction, because the barb geometry and the crimp parameters are different.

When in doubt, check the hose label: braided hose is marked 1SN, 2SN or R1AT, R2AT; spiral hose is marked 4SP, 4SH or similar.

Part Number Decoder and How to Order

The 20411 part number carries the whole specification, including the O-ring, so purchasing can copy it straight into a PO:

20411 – 22 – 08

• 20411 = 24-degree cone O-ring light-series female for braided hose
• 22 = thread nominal size (here M22x1.5, DIN light-series class for 15 mm tube)
• 08 = hose dash size (here DN12, 1/2-inch class bore)
• O-ring = O12.0x2.0 supplied with the fitting

Because one thread size can serve several hose bores, always quote both the thread size and the dash size. If you are replacing an existing fitting, send us a photo of the nut end, the hose side and the male cone stud it connects to, and we will confirm the matching part number – including the correct O-ring – the same day. This service is the fastest way to convert an unreadable old part number into a confirmed 20411 order.

Assembly Guide: Four Steps to a Reliable Crimp

These fittings are crimp-style hose ends with a swivel nut and a pre-fitted O-ring on the port end. Follow the four steps below on every assembly.

Étape 1 – Coupez le tuyau à angle droit. Use a sharp hose cutter or cutoff saw. A square, clean cut lets the ferrule grip the cover evenly. A beveled or ragged cut is the most common cause of pull-out failures.

Step 2 – Prepare the insert depth. Push the fitting tail into the hose until it bottoms firmly against the internal shoulder. The hose end must sit at the full insertion depth, not short, or the crimp zone will be wrong.

Étape 3 – Lubrifiez et insérez. Apply a thin film of assembly lubricant to the hose bore and the barb. Push the fitting in with a steady twisting motion until it bottoms out, then wipe away excess lubricant. Keep the O-ring and the cone seat clean and free of grease.

Étape 4 – Sertir et vérifier. Crimp the matched ferrule with the hose manufacturer’s crimp specification. After crimping, always measure the crimp outside diameter with a caliper and compare it with the crimp table. The measured value must sit inside the allowed tolerance band. If it is out of tolerance, do not put the assembly into service – cut it off and re-crimp with a corrected setting.

Warnings: three mistakes that cause leaks and blow-outs

• Never mix the O-ring cone joint with the plain metal cone joint. A male stud designed for a metal-cone female may not match the O-ring groove geometry of this nut, and vice versa. Confirm the joint type before ordering.
• Never discard or swap the O-ring. Each part number carries its listed O-ring size; if a seal is damaged, order the replacement in the same size and material instead of substituting.
• Never put PTFE tape or sealant on the thread, and never force the swivel nut when the cone is not aligned – the O-ring seats cleanly only with a straight approach.

Typical Applications

The 24-degree cone O-ring (DKOS-type) joint is widely used in European-specified hydraulic systems, where its sealing tolerance and vibration resistance are valued. Typical duty includes:

• Hose assemblies onto 24-degree cone O-ring male studs on pumps, valves and cylinders
• European-specified machines and their global service networks
• Machine tools, presses and injection molding machinery
• Construction, mining and material handling equipment
• Hydraulic power units and general industrial hydraulics

Wherever the mating stud carries a 24-degree cone in the light-series schedule and the joint is the O-ring type, the 20411 series is the female hose end – with the seal already in place.

OEM Customization and Quality Traceability

For equipment builders and large maintenance programs, the 20411 series can be adapted to your exact drawing and your traceability rules.

Customization options

• Thread and geometry: special threads, modified lengths and non-standard configurations machined to your drawing or to a sample.
• Surface treatment: zinc-nickel, Dacromet or other coatings for higher salt-spray grades; we confirm the achieved test hours for the coating you choose instead of quoting a generic number.
• Laser marking: your logo, part number and batch or date code laser-marked on the nut or hex for full field traceability.
• Material: stainless steel 304/316L versions for corrosive media or wash-down duty.
• O-ring material: FKM or other elastomers to match your fluid and temperature; O-rings supplied fitted or loose per your line-side process.
• Packaging and kitting: custom labels, barcodes, poly-bag or box quantities, and complete hose assembly kitting.

Quality documentation

• Batch number traceability: every order carries a batch code that links back to the production records.
• Material test reports (MTR) available for carbon steel and stainless batches.
• Dimensional inspection reports for OEM gate checks.
• Third-party inspection (BV, SGS or similar) can be arranged before shipment.

Samples and MOQ. Samples for stock sizes ship fast, and we keep low MOQs for standard part numbers so distributors can test the series without tying up capital. OEM programs can move to scheduled deliveries once the drawing is approved.

Emballage et logistique

Standard export packing: fittings are individually poly-bagged or boxed to protect threads, O-rings and cone seats, then packed in export cartons labeled with part number, quantity and batch code. Custom labeling, kitting and barcode requirements are available. Exact carton quantity, gross weight and CBM are confirmed on the packing list for every order.

FAQ

Q: What is a 24-degree cone O-ring hydraulic hose fitting? A: It is a crimp-style hose end with a female metric thread and a 24-degree cone seat that carries an O-ring (DIN 3865 / DKOS-type joint). The O-ring does the primary sealing, with the metal cone as backup, and it is supplied with the fitting.

Q: What is the difference between the O-ring cone and the plain metal cone joint? A: The plain metal cone seals on bare metal; the O-ring cone seals through an O-ring in the cone face with metal backup. The O-ring version tolerates surface wear better and holds a seal under vibration where a bare metal joint may weep.

Q: What is the difference between 20411 and 20511C? A: 20411 is the O-ring cone joint in the light thread schedule; 20511C is the metal-cone joint in the heavy schedule. Both are 24-degree cone females but for different joint types and schedules.

Q: Is the O-ring included with the fitting? A: Yes. Each part number carries its listed O-ring (for example O12.0x2.0 for the M22x1.5 sizes), supplied fitted or loose per your order. Replacement O-rings are available.

Q: What is the difference between 20411 and 20411-T? A: The -T version uses an alternate nut retention construction, shown on the manufacturer drawing. Both carry the same O-ring-equipped cone seat. Order the exact part number your drawing specifies.

Q: What is the difference between 20411 and 20412 series? A: 20411 is for wire-braided hose (1SN/2SN or R1AT/R2AT) and 20412 is for spiral hose (4SP/4SH style).

Q: Do I need thread tape or sealant? A: No. The O-ring in the cone seat does the sealing. Tape on a straight metric thread adds nothing and can contaminate the system.

Q: What is the working pressure of these fittings? A: The assembly rating depends on the hose, the ferrule and the crimp quality. Send your hose specification and we will confirm the working pressure and the recommended ferrule for your combination.

Q: Can you make custom part numbers with my logo? A: Yes. We offer laser marking, custom plating, stainless versions, O-ring material options and special dimensions, with MTR and batch traceability for OEM programs.

Order Today: 24-Degree Cone O-Ring Female Fittings with Confirmed Fit

Every 20411 metric female 24-degree cone O-ring hydraulic hose fitting in this range ships with its O-ring, is made to controlled dimensions, inspected before packing and backed by batch traceability. Send us your hose type, thread size and a photo of the male cone stud it connects to, and you will get a confirmed part number, the correct O-ring, a delivery date and a quote within one working day. Request samples first and test the swivel on your own bench – the O-ring cone seats cleanly and holds under vibration. We make sure the fitting, ferrule and hose work as one leak-free assembly.