20191 Conexões hidráulicas para mangueiras Metric Female Multiseal com cotovelo de 90 graus

90-degree hydraulic hose elbow fittings change the hose direction at the connection point instead of bending the hose – which is exactly what a tight machine bay needs. The 20191 series is the metric female multiseal version: a 90-degree swept elbow with a captive swivel nut whose seal is the spherical multiseal seat, covering 25 part numbers from M10x1 (DN5, -03) to M64x2 (DN50, -32) – the full small-to-large range in one elbow series – designed for wire-braided hose. If your layout runs out of space for a straight fitting and a hose bend, or your drawing calls a metric female multiseal elbow, this page covers dimensions, nut orientation, part numbers and OEM options.

Why Choose These 90-Degree Elbow Fittings

• Bend the layout, not the hose. A 90-degree elbow at the connection keeps the hose inside its minimum bend radius, which is where hose life is actually won or lost.
• The largest elbow range on one sheet. 25 part numbers from M10x1 (DN5) up to M64x2 (DN50) – small control lines to the biggest bore braided circuits.
• Swivel nut for orientation. The captive nut turns, so the elbow plane can be oriented toward the routing before the joint is torqued.
• Multiseal spherical seat. The female seal face is the spherical multiseal form, mating with the matching male end of the multiseal system.
• 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 spherical multiseal seat are machined per the series drawing. 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.

Why Specify an Elbow Instead of Bending the Hose

Every hose has a minimum bend radius, printed on the cover. Route a hose tighter than that radius and the reinforcement strands work against each other on every pressure cycle – the classic cause of early hose failure at the bend.

A 90-degree elbow moves the direction change into the steel fitting, where it belongs. The hose leaves the connection straight and only bends where the routing allows a proper radius. In practice that means three things:

1. Smaller envelopes. The connection turns the corner inside the fitting, so the machine bay can be tighter.
2. Longer hose life. The hose never sees the tight bend at the port, so impulse life is not consumed at the connection.
3. Cleaner assemblies. Elbows keep hoses off hot surfaces and moving parts in a way that forced bends often cannot.

The 20191 female multiseal elbow adds one more practical point: the swivel nut means the elbow plane can be set to the routing direction and locked when the joint is torqued, without twisting the hose.

What does multiseal mean on this elbow?

The sheet describes the seal as 球面 (spherical): the female end uses a spherical multiseal seat rather than a plain cone or flat face. The spherical form allows the male end to seat with a small degree of self-alignment, which is valuable on an elbow where the assembly geometry is less forgiving than a straight line. Confirm the matching male end type with us if you are replacing an existing elbow – a photo of the old male stud and nut is enough for a same-day answer.

What do the T, D and DT suffixes mean?

• T marks the alternate nut retention construction shown on the drawing (rows ending in T). Rows without T use the standard construction.
• D marks a fine-pitch thread variant for the same nominal size, for example 20191-30-12D uses M30x1.5 where 20191-30-12 uses M30x2.
• DT combines the fine pitch and the T construction, for example 20191-27-10DT uses M27x1.5 where 20191-27-10T uses M27x2.

Order the exact part number from your drawing or the old fitting – the pitch and the nut construction must both match the port.

20191 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 spherical seat stay fatigue-resistant under impulse loads; 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 so there is no joint at the corner.

Full dimension and part number table

All linear dimensions are in millimeters. E = thread, DN = hose bore, A and C = lengths per the supplier drawing, H = overall elbow height per the drawing, S2 = swivel nut hex across flats. Rows ending in T use the alternate nut retention construction; D/DT rows use the fine-pitch thread shown in the thread column.

Full dimensioned CAD drawings are available on request so your engineers can verify every length, the elbow height and the spherical 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 20191 elbow 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.

Which Fitting Series Do You Need: 20191 (Braided) or 20192 (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 20192 series as 20192-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 20191 part number carries the specification – thread, pitch, bore, nut construction – so purchasing can copy it straight into a PO:

20191 – 30 – 12D

• 20191 = 90-degree metric female multiseal elbow for braided hose
• 30 = thread nominal size (here M30, with the D suffix fixing the pitch at M30x1.5)
• 12 = hose dash size (here DN20, 3/4-inch class bore)
• T (where present) = alternate nut retention construction
• No suffix = standard pitch for the row (here M30x2)

Because one thread size can serve several hose bores and two pitches, always quote the full part number including any T, D or DT suffix. 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 elbow orientation and the correct pitch, the same day.

Assembly Guide: Four Steps with the Elbow and Swivel Nut

The 90-degree elbow is crimped on the tail and tightened on the spherical multiseal seat, so the work splits into a crimp routine and a torque routine.

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 spherical seat clean and free of nicks.

Step 4 – Crimp and verify. Crimp the matched ferrule with the hose manufacturer’s crimp specification. After crimping, measure the crimp outside diameter with a caliper and compare it with the crimp table. Then set the elbow plane to the routing direction and torque the swivel nut onto the 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 aim the elbow by bending the hose. If the nut cannot reach the correct orientation, re-check the part number or use an adjustable fitting – forcing the hose twists the reinforcement.
• Never assume the pitch. M27x1.5 and M27x2, or M30x1.5 and M30x2, are different ports – check the drawing or measure the pitch.
• Never put PTFE tape or sealant on a metal-seat joint. The multiseal spherical seat does the sealing, and contamination can score it.

Typical Applications

90-degree female multiseal elbows serve layouts where the connection must turn the corner in tight space:

• Machine tools, presses and injection molding machinery
• Agricultural and construction machinery hydraulic bays
• Hydraulic power units and valve stands
• Mobile equipment with compact plumbing
• Replacement service for machines with unreadable or obsolete elbow part numbers

Wherever the port takes a metric female multiseal connection and the routing demands a 90-degree turn, the 20191 series is the elbow to specify – from DN5 control lines to DN50 main circuits.

OEM Customization and Quality Traceability

For equipment builders and large maintenance programs, the 20191 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 retained nut per your machine and service preference.
• 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, spherical 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 multiseal 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 and a spherical multiseal seat, used where the hose must turn the corner at the connection.

Q: Why use an elbow instead of bending the hose? A: Every hose has a minimum bend radius. An elbow moves the direction change into the steel, so the hose never sees the tight bend at the port – smaller envelopes and longer hose life.

Q: What does multiseal (spherical seat) mean? A: The female seal face is the spherical multiseal form rather than a plain cone or flat face, allowing a small degree of self-alignment when seating against the matching male end. Confirm your male end type with a photo for a same-day answer.

Q: What do the T, D and DT suffixes mean? A: T marks the alternate nut retention construction. D marks a fine-pitch thread variant (for example 20191-30-12D uses M30x1.5 where 20191-30-12 uses M30x2). DT combines both.

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

Q: What is the difference between 20191 and 20192 series? A: 20191 is for wire-braided hose (1SN/2SN or R1AT/R2AT) and 20192 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: 90-Degree Multiseal Elbows with Confirmed Fit

Every 20191 90-degree 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 pitch and nut construction – a delivery date and a quote within one working day. Request samples first and trial-fit one on your own layout: the swivel nut and the spherical seat 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.