20411TRW Metric Female 24-Degree Cone O-Ring LIGHT-Series ONE-PIECE Hydraulic Hose Fittings

One-piece female 24-degree cone O-ring hydraulic hose fittings bring every seal element together before the box opens: the crimp sleeve is pre-fitted on the hose tail, the O-ring sits ready in the 24-degree cone seat, and the swivel nut turns freely on top. The 20411TRW light-series (L.T.) series is the one-piece version of the 20411 female end, with the same 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, for wire-braided hose. If your shop builds female hose ends onto 24-degree cone O-ring male studs in volume, this page explains what the one-piece construction removes from your process – and which part number suffix to order.

Why Choose One-Piece Female O-Ring Cone Fittings

• Everything pre-fitted: sleeve, O-ring and swivel nut. The ferrule is already on the tail and the O-ring is already in the cone seat, so the fitting arrives complete and ready to crimp.
• The forgiving O-ring cone joint. The O-ring does the primary sealing with metal cone backup (DIN 3865 / DKOS-type joint), tolerating surface wear that a bare metal cone would leak on.
• One part number, one bin. Stock the complete fitting instead of matching stems, ferrules and O-rings separately.
• Light-series (L.T.) thread schedule. DIN light-series threads, M12x1.5 for a 6 mm tube class up to M52x2 for 42 mm.
• 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 12151-2 hose-fitting standard – 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.

One-Piece vs Two-Piece: What Changes on the Female Side

A female hose end carries more parts than a male end: the stem, the sleeve, the swivel nut and the O-ring. In a two-piece 20411 fitting the operator handles the stem and the sleeve separately and must not forget the O-ring. Every one of those steps is an error mode on a busy bench.

The 20411TRW one-piece version removes the handling problem at the source. The sleeve is already fitted on the stem and the O-ring is already seated in the cone, so the operator inserts the hose, crimps and verifies. The sleeve is always at the correct depth and orientation, the O-ring is always present, and the results are consistent from one operator to the next.

Same port end as the two-piece 20411

The 20411TRW female end is dimensionally the same ISO 12151-2 / DIN 3865 O-ring cone light series as the two-piece 20411: same threads, same cone seat, same O-ring sizes, same swivel nut hex. The difference is on the hose side, where the sleeve comes integrated. If your drawing specifies the 20411 series, the -RW one-piece version is a drop-in on the port side.

What do the RW and TRW suffixes mean?

• RW marks the one-piece construction (sleeve pre-fitted on the stem) for the sizes listed with it.
• TRW marks the one-piece construction combined with the alternate nut retention design shown on the 20411-T drawing – the same sizes that carry a T suffix in the two-piece 20411 table.
• Order the exact suffix from your drawing or the old fitting, and we will confirm the construction before dispatch.

20411TRW 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, the sleeve 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.
• Sleeve: integrated with the stem as one delivered assembly, plated to match the body.

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 supplied with the fitting (as printed in the catalog), A and C = lengths per the supplier drawing, S2 = swivel nut hex across flats. RW = one-piece construction; TRW = one-piece with the alternate nut retention design.

Full dimensioned CAD drawings are available on request so your engineers can verify every length, the cone seat, the O-ring groove and the sleeve 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 20411TRW 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 crimp setting 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 and check the O-ring material limit for your fluid temperature.

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

The part number changes with the hose construction, because the barb geometry and the crimp parameters are different. For spiral-reinforced hose (4SP/4SH style), the series prefix changes to 20412, ordered as 20412-XX-XXTRW. Check the hose label before ordering: 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 20411TRW part number carries the whole specification – thread, bore, O-ring and construction – so purchasing can copy it straight into a PO:

20411 – 22 – 08RW

• 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)
• RW = one-piece construction; TRW = one-piece with alternate nut retention design
• 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 and suffix – the same day.

Assembly Guide: Four Steps with the Pre-Fitted Sleeve

The one-piece design shortens the female-end assembly routine to four steps, with the sleeve and the O-ring already in place.

Step 1 – Cut the hose square. Use a sharp hose cutter or cutoff saw. A square, clean cut lets the pre-fitted sleeve grip the cover evenly. A beveled or ragged cut is the most common cause of pull-out failures.

Step 2 – Prepare the insert depth. The hose must reach the full insertion depth inside the one-piece fitting. Measure once against the fitting or the crimp die, and use that depth on every assembly of the same size.

Step 3 – Lubricate and insert. Apply a thin film of assembly lubricant to the hose bore and the barb zone, then push the hose into the pre-fitted sleeve and over the stem until it bottoms out. Wipe away excess lubricant. Keep the O-ring and the cone seat clean.

Step 4 – Crimp and verify. Crimp the pre-fitted sleeve 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. 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.
• 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 re-use a fitting that has already been crimped, and never put PTFE tape or sealant on the thread. The one-piece sleeve is made for one crimp cycle.

Typical Applications

The 24-degree cone O-ring (DKOS-type) joint is widely used in European-specified hydraulic systems, where sealing tolerance and vibration resistance are valued. The one-piece female version earns its place wherever female ends are made in volume and consistency matters:

• Hose assembly shops and distributors producing female O-ring cone ends in batches
• 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 O-ring joint in the light-series schedule, the 20411TRW series is the female hose end – complete with sleeve, O-ring and swivel nut in one part number.

OEM Customization and Quality Traceability

For equipment builders and large maintenance programs, the 20411TRW 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.
• Packaging and kitting: custom labels, barcodes, poly-bag or box quantities, and pre-kitted assemblies for line-side supply.

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.

Packaging and Logistics

Standard export packing: fittings are individually poly-bagged or boxed to protect the pre-fitted sleeves, O-rings, threads 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 one-piece female 24-degree cone O-ring hydraulic hose fitting? A: It is a crimp-style female hose end where the sleeve is pre-fitted on the stem and the O-ring is pre-seated in the 24-degree cone. The operator inserts the hose and crimps – no separate ferrule or O-ring to handle.

Q: What is the difference between 20411TRW and the two-piece 20411? A: The port end is dimensionally the same. The difference is on the hose side: the 20411TRW has the sleeve pre-fitted, so there is no separate ferrule to align and the O-ring is already in place.

Q: What do the RW and TRW suffixes mean? A: RW marks the one-piece construction. TRW marks the one-piece construction combined with the alternate nut retention design – the sizes that carry a T suffix in the two-piece 20411 table.

Q: Is the O-ring included? A: Yes. Each part number carries its listed O-ring (for example O12.0x2.0 for the M22x1.5 sizes). Replacement O-rings are available.

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.

Q: What is the difference between 20411TRW and 20412TRW? A: 20411TRW is for wire-braided hose (1SN/2SN or R1AT/R2AT) and 20412TRW 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 and the crimp quality. Send your hose specification and we will confirm the working pressure and the crimp setting for your combination.

Q: Can a one-piece fitting be re-used after crimping? A: No. The sleeve is made for one crimp cycle. Cut the assembly off and use a new fitting.

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: One-Piece Female O-Ring Cone Fittings with Confirmed Fit

Every 20411TRW one-piece female 24-degree cone O-ring hydraulic hose fitting in this range ships with its sleeve and O-ring in place, 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 suffix and O-ring, a delivery date and a quote within one working day. Request samples first and run them through your own crimper – the pre-fitted sleeve and O-ring are the fastest way to see what one-piece construction does for your reject rate on female ends. We make sure the fitting, hose and crimp work as one leak-free assembly.