20591C 90-Degree Elbow Metric Female 24-Degree Multiseal HEAVY-Series Hydraulic Hose Fittings

24-degree multiseal heavy hose elbow fittings put a 90-degree turn into a heavy-series 24-degree cone connection, changing direction in the steel elbow instead of bending the hose. The 20591C series is the metric female multiseal version in the heavy (H.T.) schedule: a 90-degree swept elbow whose swivel nut carries the 24-degree spherical multiseal seat, covering 10 part numbers from M16x1.5 (DN6, -04) to M52x2 (DN32, -20), mapping to DIN heavy-series tube classes from 8 to 38 mm, designed for wire-braided hose. If your high-pressure circuits connect hose onto heavy-series 24-degree cone male studs – and the routing needs a compact right-angle turn – this page covers dimensions, the nut variants, part numbers and OEM options.

Why Choose These Heavy-Series Multiseal 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 – smaller envelopes and longer hose life.
• Heavy-series (H.T.) 24-degree system. The swivel nut seat matches 24-degree cone male studs in the DIN heavy thread schedule (tube classes 8-38 mm in this table).
• Multiseal spherical seat. The female seal face is the spherical multiseal form of the 24-degree system, seating with a small degree of self-alignment.
• Swivel nut for orientation. The nut turns freely, so the elbow plane is set toward the routing before the joint is torqued – no twisted hose.
• OEM-ready. Laser marking, custom plating, material test reports and batch traceability.

Standards and traceability. Threads are ISO 724 metric threads. The 90-degree elbow geometry and the 24-degree multiseal spherical seat are machined per the series drawing, in the DIN heavy-series (H.T.) schedule with the tube classes shown in the table. 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.

Heavy vs Light Multiseal Elbows: Not Interchangeable

The 24-degree multiseal system exists in two thread schedules, and the elbow follows the schedule of the male stud:

• Light series (L.T.), the 20491C-type elbow. Light threads such as M22x1.5 for 15 mm tube or M30x2 for 22 mm tube.
• Heavy series (H.T.), this 20591C series. Heavy threads such as M22x1.5 for 14 mm tube, M24x1.5 for 16 mm tube or M30x2 for 20 mm tube.

The schedules step their tube classes differently, so the same nominal thread can appear in both series but belongs to different tube classes and different seat envelopes. Order the elbow from the same schedule as the male stud: heavy male stud, heavy elbow – light male stud, light elbow.

The table maps every part number to its DIN heavy-series tube class (Tube O.D. column), the way many machine drawings describe the port: for example tube class 14 mm takes M22x1.5 and tube class 38 mm takes M52x2. If your drawing states a tube size instead of a thread, the Tube O.D. column is your direct lookup – but check first whether the drawing is light or heavy schedule, because the two schedules step their tube classes differently.

Which male stud does it connect to?

A male stud in the 24-degree cone system, heavy (H.T.) schedule, designed for a multiseal (spherical) female seat. The 24-degree system also appears as metal-cone and O-ring variants – the seal variant must match the male stud, not just the 24-degree label. If you are replacing an existing elbow, send a photo of the male stud and we will confirm which 24-degree variant and schedule you need.

Why are nearly all rows the -T construction?

In this heavy series, nine of the ten part numbers carry the T suffix shown on the 20591C-T drawing (only 20591C-16-04 uses the standard construction). The T construction is the factory’s standard build for this heavy elbow range; both constructions use the same thread, tube class and multiseal seat. Order the exact part number from your drawing or the old fitting, and we will confirm the construction before dispatch.

20591C 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 elbow body, thread and multiseal seat stay fatigue-resistant; typical surface hardness range HRC 20-28 (confirm the exact code on your drawing or PO).
• Elbow geometry: swept 90-degree bend, machined as one piece with the body; the 24-degree multiseal seat 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 seat geometry, A = drop length to the hose tail shoulder, C = thread-area depth, H = drop height from the centerline to the nut base, S2 = swivel nut hex across flats (dimension definitions per the supplier drawing). Rows ending in T carry the nut construction shown on the 20591C-T drawing.

Full dimensioned CAD drawings are available on request so your engineers can verify every length, the elbow height and the multiseal seat 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 20591C elbow depends on the hose you pair it with and the crimp quality. The heavy schedule is specified where the circuit or the port standard demands it – typically the higher-pressure classes of the size range. Wire-braided hydraulic hose in this range commonly operates from roughly 80 bar (large bore) up to 400 bar (small bore 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.

Which Fitting Series Do You Need: 20591C (Braided) or 20592C (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), order the 20592C series as 20592C-XX-XX. 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 20591C part number carries the specification – thread, tube class, bore, construction – so purchasing can copy it straight into a PO:

20591C – 30 – 10T

• 20591C = 90-degree metric female 24-degree multiseal heavy-series elbow for braided hose
• 30 = thread nominal size (here M30x2, DIN heavy-series class for 20 mm tube)
• 10 = hose dash size (here DN16, 5/8-inch class bore)
• T = the nut construction shown on the 20591C-T drawing (standard build for this series)

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, send us a photo of the male stud, the old nut and the elbow body – we will confirm the matching part number, including the correct 24-degree seal variant, schedule and construction, the same day.

Assembly Guide: Four Steps with the Heavy Multiseal Elbow

Step 1 – Cut the hose square. 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 elbow 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.

Step 3 – Lubricate and insert. Apply a thin film of assembly lubricant to the hose bore and the barb. Push the elbow in with a steady twisting motion until it bottoms out, then wipe away excess lubricant. Keep the multiseal seat clean and free of nicks.

Step 4 – Crimp, verify, orient and torque. Crimp the matched 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 male 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 mix the heavy and light schedules. A heavy-series male stud needs a heavy-series elbow; the light-series seat geometry does not match.
• Never match the 24-degree label alone. The metal-cone, O-ring and multiseal variants of the 24-degree system are different female seats – confirm the variant of the male stud.
• Never put PTFE tape or sealant on a metal-seat joint. The multiseal seat does the sealing, and contamination can score it.

Aplicaciones típicas

90-degree 24-degree multiseal heavy-series female elbows serve layouts that combine heavy-schedule 24-degree cone connections with a compact right-angle turn:

• Machine tools, presses and injection molding machinery
• European-specified machines and their global service networks
• Hydraulic power units and valve stands
• Construction, mining and material handling equipment
• Replacement service for machines with unreadable or obsolete elbow part numbers

Wherever the male stud carries a heavy-series 24-degree multiseal connection and the routing demands a 90-degree turn, the 20591C series is the elbow to specify.

OEM Customization and Quality Traceability

For equipment builders and large maintenance programs, the 20591C 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 (for example 45 degrees) 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.
• Nut construction: standard or -T variant per your drawing.
• 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.

Packaging and Logistics

Standard export packing: elbows are individually poly-bagged or boxed to protect threads, multiseal seats 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 multiseal heavy-series hydraulic hose elbow? A: It is a crimp-style 90-degree swept elbow whose port end is a female metric thread with a swivel nut carrying the 24-degree spherical multiseal seat, in the DIN heavy (H.T.) schedule.

Q: What is the difference between the heavy (20591C) and light (20491C) multiseal elbows? A: The schedules step their tube classes differently, so the same nominal thread can belong to different tube classes and seat envelopes. A heavy male stud needs the heavy elbow; a light male stud needs the light elbow.

Q: What does the Tube O.D. column mean? A: It shows the DIN heavy-series tube class sharing this thread and seat geometry (for example 14 mm tube takes M22x1.5), so drawings that state tube sizes can be looked up directly – after checking light versus heavy schedule.

Q: What does the T suffix mean, and why do nearly all rows carry it? A: T marks the nut construction shown on the 20591C-T drawing. In this heavy series it is the factory’s standard build; only 20591C-16-04 uses the standard construction without T.

Q: Which male stud does it connect to? A: A male stud in the 24-degree cone system, heavy schedule, designed for a multiseal (spherical) female seat. Confirm the seal variant with a photo – the metal-cone, O-ring and multiseal 24-degree variants are not interchangeable.

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: What is the difference between 20591C and 20592C series? A: 20591C is for wire-braided hose (1SN/2SN or R1AT/R2AT) and 20592C is for spiral hose (4SP/4SH style).

Q: What is the working pressure of these elbows? 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 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: Heavy Multiseal Elbows with Confirmed Fit

Every 20591C 24-degree multiseal hydraulic hose elbow fitting in this range is machined 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 correct 24-degree seal variant, schedule and construction – a delivery date and a quote within one working day. Request samples first and trial-fit one on your own layout: the self-aligning multiseal seat and the swivel nut make 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.