20593 90-Degree Elbow Metric Female 24-Degree Cone O-Ring HEAVY INTERLOCK Hydraulic Hose Fittings

Female O-ring cone interlock elbow fittings add a right-angle turn to the big-bore interlock system: the port side seals through an O-ring in the 24-degree cone seat (DIN 3865 / DKOS-type joint, heavy schedule), while the hose side uses an interlock tail – the ribbed gripping zone with a locking profile that engages the matched interlock ferrule against blow-off under pressure impulses – turned 90 degrees so the hose leaves the connection in the routing direction. The 20593 series covers 6 part numbers from DN20 (-12) to DN40 (-24), female metric threads M36x2 to M52x2 mapping to DIN heavy-series tube classes from 25 to 38 mm, the top end of the heavy schedule. If your large-bore circuits see pressure spikes, vibration or impulse service and the plumbing needs a compact corner, this page explains what the interlock elbow does for blow-off resistance – and how to order it as a complete system.

Why Choose These Interlock O-Ring Cone Elbow Fittings

• Turn the corner in steel, not in the hose. The 90-degree elbow keeps the hose inside its minimum bend radius at the connection – tighter envelopes and longer hose life on big-bore circuits where bends are hardest to manage.
• Blow-off resistant interlock tail. The locking profile on the tail works with the matched interlock ferrule to hold the hose mechanically, not just by barb friction – the retention principle specified for the largest heavy circuits.
• O-ring already fitted in the cone seat. The 24-degree cone carries its heavy-series O-ring (sizes per part number), and the seal can be replaced without scrapping the fitting.
• Swivel nut that turns freely. The nut rotates on the tail, so the elbow plane is set toward the routing before the joint is torqued – no twisted hose on assemblies too heavy to fight.
• 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, in its heavy (H.T.) schedule. (Note: the source sheet prints ISO 12151-1; that part of the standard covers O-ring face seal ends, so ISO 12151-2 is cited here as confirmed against the series drawings.) Fittings are designed to pair with wire-braided or spiral hose per the W/T construction ordered, built to EN 853 or EN 856 performance classes respectively. Dimensional inspection reports and material test certificates are available for OEM gate checks.

What the Interlock Tail Does on a 90-Degree Elbow

On a plain barbed tail, hose retention comes from the barbs biting into the tube and cover plus the ferrule grip. On a big-bore heavy circuit, pressure impulses act like a hammer on the hose end, and that is where the interlock design earns its name – whether the end is straight or an elbow.

The 20593 tail carries a ribbed gripping zone plus a locking profile near the body, formed as part of the 90-degree elbow. When the matched interlock ferrule is crimped over it, the ferrule and the tail profile engage mechanically, locking the hose in place rather than relying on barb friction alone. The elbow changes direction in the steel, so the interlock zone never has to fight a forced bend at the connection.

Interlock is a system, not a single part. The locking profile only works with the matched interlock ferrule and its crimp data. Mixing an interlock elbow with a standard ferrule removes the locking benefit and risks blow-off. For every 20593 part number you have three ordering options:

1. Fitting only – if you already hold the matched interlock ferrule and crimp data.
2. Fitting + matched interlock ferrule – the recommended option for hose assembly shops, so the tail and ferrule profiles always come from the same engineering data.
3. Complete hose assembly – we cut, crimp and pressure-test assemblies to your length and fitting list.

What do the W and T rows mean?

The 20593 table lists two tail constructions, marked -W and -T, shown as separate diagrams on the drawing – the same W/T pattern as the straight 20513 interlock series, where the same sizes carry the same suffixes (for example 20513-36-12T and 20513-36-16W correspond to 20593-36-12T and 20593-36-16W). In interlock families of this type, the W and T rows carry the tail design matched to the hose reinforcement – braided (wire) hose for one, spiral hose for the other – but because the source sheets do not state the mapping in words, we confirm the correct construction for your hose on every order. Send your hose label (1SN/2SN or 4SP/4SH) with your inquiry and we will match the right part number.

Interlock elbow vs the standard crimp elbow (20593 vs 20591)

The heavy O-ring cone schedule appears with two hose-side tail designs in this catalog:

• 20591 (standard crimp): plain barbed tail with a standard ferrule, the general-purpose heavy elbow.
• 20593 (this page, interlock): interlock tail with the matched interlock ferrule, for the largest bores and impulse-duty circuits where blow-off resistance matters most.

Both share the same 24-degree O-ring cone port end in the heavy schedule. If your circuit is large-bore, pulse-loaded or safety-critical, the interlock version is the elbow to specify.

20593 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 so the interlock profile, the thread, the cone seat and the nut stay fatigue-resistant under impulse loads; 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 – these are the heavy-series sizes, not the light-series sizes.
• Elbow geometry: swept 90-degree bend, machined as one piece with the body; the interlock profile is machined, not cast.

Full dimension and part number table

All linear dimensions are in millimeters. E = thread, DN = hose bore, Tube O.D. = the DIN heavy-series tube class sharing this thread and cone geometry, O-ring = the seal supplied with the fitting (as printed in the catalog), A = cut-off length from the bend center to the start of the hose tail, H = drop height from the hose-tail axis to the end of the nut, C = sealing face/shoulder thickness, S2 = swivel nut hex across flats (dimension definitions per the supplier drawing). W and T rows carry the two tail constructions shown on the drawing; confirm the one matched to your hose when ordering.

Full dimensioned CAD drawings are available on request so your engineers can verify every length, the elbow height, the interlock profile, 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 20593 elbow depends on the hose you pair it with, the matched interlock ferrule and the crimp quality. This series exists to serve the large-bore, high-pressure and impulse-duty circuits where blow-off resistance matters, and the pressure class is defined by the hose construction you order (braided or spiral) plus the interlock ferrule crimp. Send us your hose specification and the circuit details, and we will confirm the working pressure, burst margin and the matched interlock 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 and check the O-ring material limit for your fluid temperature.

Part Number Decoder and How to Order

The 20593 part number carries the specification – thread, bore, O-ring and tail construction – so purchasing can copy it straight into a PO:

20593 – 52 – 20T

• 20593 = 90-degree metric female 24-degree cone O-ring heavy-series interlock elbow
• 52 = thread nominal size (here M52x2, DIN heavy-series class for 38 mm tube)
• 20 = hose dash size (here DN32, 1-1/4-inch class bore)
• T (or W) = tail construction per the drawing (confirm braided or spiral against your hose)
• O-ring = O33.3×2.4 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 elbow or building a new circuit, send us the hose label, the male cone stud and, if available, a photo of the old interlock ferrule – we will confirm the matching 20593 part number, the W or T construction, and the ferrule, the same day.

Assembly Guide: Four Steps with the Interlock Elbow

Step 1 – Cut the hose square. Use a sharp hose cutter or cutoff saw. A square, clean cut lets the interlock 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 elbow tail into the hose until it bottoms firmly against the internal shoulder. The hose end must sit at the full insertion depth so the interlock profile and the ferrule line up correctly.

Step 3 – Lubricate and insert. Apply a thin film of assembly lubricant to the hose bore and the interlock tail. Push the elbow in with a steady twisting motion until it bottoms out, then wipe away excess lubricant. Keep the O-ring and the cone seat clean.

Step 4 – Crimp, verify, orient and torque. Crimp the matched interlock ferrule with the hose manufacturer’s crimp specification and measure the crimp outside diameter against the crimp table. Then set the elbow plane to the routing direction and torque the swivel nut onto the heavy-series 24-degree cone stud – the nut turns freely, so the hose is never twisted to aim the elbow.

Warnings: three mistakes that cause leaks and blow-outs

• Never use a standard ferrule on an interlock tail. The locking benefit comes from the matched interlock ferrule; mixing parts removes it and risks blow-off under impulse.
• Never mix the heavy and light schedules, and never mix the O-ring cone elbow with multiseal or plain metal cone elbows – match the schedule and the seal variant to the male stud.
• Never re-use a fitting that has already been crimped, and never put PTFE tape or sealant on the thread. The O-ring in the cone seat does the sealing.

Typical Applications

90-degree interlock female elbows serve the large-bore layouts where both blow-off resistance and a compact corner are required:

• Mining, quarrying and bulk handling equipment
• Offshore and marine hydraulic systems
• Large mobile machines with impulse-loaded big-bore circuits
• Hydraulic power units with high-flow return and pressure lines
• Replacement service for machines with unreadable or obsolete elbow part numbers

Wherever the male stud carries a heavy-series 24-degree O-ring cone joint, the bore is large and the routing demands a 90-degree turn, the 20593 series is the elbow to specify – complete with its O-ring and the interlock system.

OEM Customization and Quality Traceability

For equipment builders and large maintenance programs, the 20593 series can be adapted to your exact drawing and your traceability rules.

Customization options

• Thread and geometry: special threads, modified lengths, non-standard elbow angles and 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 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.
• System kitting: matched interlock ferrules supplied with the fittings, pre-kitted per hose size for line-side supply.
• 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. Because interlock is a system, we recommend ordering the fitting and the matched ferrule together for the first trial. OEM programs can move to scheduled deliveries once the drawing is approved.

Packaging and Logistics

Standard export packing: elbows are individually poly-bagged or boxed to protect threads, O-rings, cone seats, interlock tails and swivel nuts, 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 90-degree metric female 24-degree cone O-ring interlock hydraulic hose elbow? A: It is a crimp-style 90-degree swept elbow with a female metric swivel nut carrying a 24-degree cone O-ring seat (DIN 3865 / DKOS-type joint) in the heavy schedule, and an interlock tail on the hose side that engages a matched interlock ferrule for blow-off resistance.

Q: What does the interlock tail do that a plain barb does not? A: The interlock profile and the matched ferrule engage mechanically, locking the hose in place under pressure impulses instead of relying on barb friction alone – the retention principle specified for the largest heavy circuits.

Q: Is the O-ring included? A: Yes. Each part number carries its listed O-ring (for example O33.3×2.4 for the M52x2 sizes). Replacement O-rings are available.

Q: What do the W and T suffixes mean? A: They mark the two tail constructions shown on the drawing – the same W/T pattern as the straight 20513 series. The source sheets do not map W/T to braided or spiral in words, so we confirm the construction for your hose on every order.

Q: What is the difference between 20593 and 20591? A: Both are heavy 24-degree O-ring cone 90-degree elbows. 20591 uses a plain barbed tail with a standard ferrule; 20593 uses the interlock tail with the matched interlock ferrule for large-bore, impulse-duty circuits.

Q: What is the difference between 20593 and 20513? A: 20513 is the straight (inline) version of the heavy interlock female end; 20593 is the 90-degree elbow version. Same port system, same O-ring family, same interlock principle.

Q: Can the elbow be oriented after crimping? A: Yes – the swivel nut turns freely, so the elbow plane is set toward the routing when the nut is torqued, without twisting the hose.

Q: Can a crimped interlock fitting be re-used? A: No. The ferrule and tail are made for one crimp cycle. Cut the assembly off and use a new fitting with a new matched ferrule.

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

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

Order Today: Interlock Elbows with Confirmed Fit

Every 20593 metric female 24-degree cone O-ring hydraulic hose elbow in this range ships with its O-ring, is made to controlled dimensions, inspected before packing and backed by batch traceability. Send us a photo of the male stud, your hose type and thread size, and you will get a confirmed part number – including the W or T construction, the matched interlock ferrule and the correct O-ring – a delivery date and a quote within one working day. Request samples first and trial-fit one on your own layout: the interlock tail locks the hose in place and the swivel nut makes the elbow as easy to aim as it is to route. We make sure the fitting, ferrule and hose work as one leak-free assembly.