20711 GB Metric Female 74-Degree Cone Seat Hydraulic Hose Fittings (Swivel Nut)

Metric female 74-degree cone seat hydraulic hose fittings are the swivel-nut female ends of the GB 74-degree cone family: the nut carries a 74-degree internal cone seat that receives a male stud with a matching 74-degree external cone, sealing metal-to-metal without seals or tape. The 20711 series covers 34 part numbers from DN4 (-02) to DN40 (-24), female metric threads M10x1 to M52x2, designed for wire-braided hose. If you connect hose ends onto 74-degree external-cone male studs on Chinese-specified agricultural and construction machinery – or you need the female counterpart to the 10711 male series – this page is your reference for dimensions, nut constructions, part numbers and OEM options.

Why Choose These 74-Degree Cone Seat Fittings

• The GB-standard cone geometry. 74-degree internal cone seat (37 degrees per side), the national-standard cone family used on Chinese agricultural and construction machinery ports.
• Widest female coverage in the cone families. 34 part numbers from DN4 (-02) to DN40 (-24) – the full female range including the small bores.
• Swivel nut that turns freely. The nut rotates on the hose tail, so the connection tightens onto the cone stud without twisting the hose.
• Two nut constructions. Standard and -T retained-nut versions cover the port-access and service requirements of different machines.
• OEM-ready. Laser marking, custom plating, material test reports and batch traceability.

Standards and traceability. Threads are ISO 724 metric threads. The sealing cone follows the GB-series 74-degree cone geometry – catalog reference as printed on the series sheet (REF GB/T 9065.1 on the female series, REF GB/T 5628 on the male 10711 series; both labels under factory confirmation, see the notes section). The 74-degree included angle is the metric-thread cousin of the 37-degree flare family. 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.

Which Male Stud Does This Female End Connect To?

A 74-degree cone seat female receives a male stud with a 74-degree external cone – no O-ring, no bonded seal, no tape. The joint is metal-to-metal: the two machined cones mate and the threads hold the preload.

Three checks before ordering:

1. Cone angle. The port stud must carry a 74-degree external cone (37 degrees per side). A 60-degree or 24-degree cone will not seal against a 74-degree seat.
2. Thread system and pitch. Metric thread and pitch must match, for example M22x1.5. The same cone angle with inch threads (JIC 74-degree flare) is a different system.
3. Nut construction. Standard or -T retained nut – both fit the same cone and thread, and the choice follows your machine or service preference.

In the catalog structure, the matching male hose end is the 10711 series (74-degree external cone male), and machine-side male studs with the same cone geometry connect directly to this 20711 female. If you are not sure, send us a photo of the stud – cone angle, thread and pitch – and we will confirm the matching 20711 part number.

What do the T and C suffixes mean?

• T marks the retained-nut construction shown on the drawing (the retaining ring/wire version of the swivel nut). Rows without T use the standard nut construction.
• C marks an alternate thread pitch for the same nominal thread, for example 20711-12-03C uses M12x1.25 where the standard row 20711-12-03 uses M12x1.5.

Order the exact part number from your drawing or the old fitting – including any T or C suffix – and we will confirm the construction before dispatch.

74-degree cone vs the other metric cone systems

The same metric thread size can appear in several cone systems, and only the matching angle seals:

20711 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).
• Sealing face: the 74-degree internal cone seat is machined, not cast, so the cone surface stays clean and concentric for a metal-to-metal seal.

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, S2 = swivel nut hex across flats. Rows ending in T use the retained-nut construction; the row marked C uses the alternate pitch shown in the thread column.

Full dimensioned CAD drawings are available on request so your engineers can verify every length and the 74-degree cone 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 20711 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.

Which Fitting Series Do You Need: 20711 (Braided) or 20712 (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 20712 series as 20712-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 20711 part number carries the specification – thread, pitch, bore, nut construction – so purchasing can copy it straight into a PO:

20711 – 30 – 10T

• 20711 = GB-series 74-degree cone seat female for braided hose
• 30 = thread nominal size (here M30x1.5)
• 10 = hose dash size (here DN16, 5/8-inch class bore)
• T = retained-nut construction; no suffix = standard nut
• C (where present) = alternate pitch, e.g. 20711-12-03C uses M12x1.25

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 male stud, the old nut and the hose side, and we will confirm the matching part number – including the correct cone angle, pitch and nut construction – the same day.

Assembly Guide: Four Steps to a Reliable Crimp

These fittings are crimp-style hose ends with a swivel nut carrying the 74-degree cone seat on the port end. Follow the four steps below on every assembly.

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 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.

Step 3 – Lubricate and insert. 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 cone seat clean and free of nicks.

Step 4 – Crimp and verify. 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. 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 assume the cone angle. The male stud must carry a 74-degree external cone; a 60-degree or 24-degree cone will not seal in this seat.
• Never use a JIC 74-degree female on a metric-thread male. The cone angle matches but the thread system does not – metric threads need the metric 20711 series.
• Never put PTFE tape or sealant on a metal-cone joint. The machined cone seat does the sealing, and tape contamination can score the seat.

Typical Applications

The GB 74-degree cone series is widely used on Chinese-specified agricultural and construction machinery and their service networks, plus general industrial hydraulics where the 74-degree cone seat is specified:

• Agricultural machinery and implements
• Construction and earthmoving equipment
• Material handling and lift equipment
• General industrial hydraulic circuits with 74-degree cone male studs
• Replacement service for machines with unreadable or obsolete part numbers

Wherever the machine side presents a 74-degree external-cone male stud with metric threads, the 20711 series is the female hose end to connect to it – and where the machine port is a 74-degree internal cone, the 10711 male series is the matching hose end.

OEM Customization and Quality Traceability

For equipment builders and large maintenance programs, the 20711 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.
• 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: fittings are individually poly-bagged or boxed to protect 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 metric female 74-degree cone seat hydraulic hose fitting? A: It is a crimp-style female hose end whose swivel nut carries a 74-degree internal cone seat (37 degrees per side). It receives a male stud with a matching 74-degree external cone and seals metal-to-metal, with metric threads.

Q: Which male stud does it connect to? A: Any male stud with a 74-degree external cone and matching metric thread and pitch – including the 10711 male hose-end series. Confirm the cone angle before ordering.

Q: What is the difference between the metric 74-degree cone and JIC 74-degree flare? A: The cone angle is the same but the thread system differs: this series uses metric threads, while JIC uses inch UN threads. A metric-thread male needs the metric fitting.

Q: What do the T and C suffixes mean? A: T marks the retained-nut construction (retaining ring/wire version of the swivel nut). C marks an alternate thread pitch, for example 20711-12-03C uses M12x1.25 instead of M12x1.5.

Q: Do I need thread tape or sealant? A: No. The machined 74-degree metal cone does the sealing. Tape or sealant on a metal-cone joint adds nothing and can score the seat.

Q: What is the difference between 20711 and 20712 series? A: 20711 is for wire-braided hose (1SN/2SN or R1AT/R2AT) and 20712 is for spiral hose (4SP/4SH style).

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 and special dimensions, with MTR and batch traceability for OEM programs.

Order Today: 74-Degree Cone Seat Females with Confirmed Fit

Every 20711 metric female 74-degree cone seat hydraulic hose 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 cone angle, pitch and nut construction – a delivery date and a quote within one working day. Request samples first and torque one onto your own stud: the machined cone seat seats cleanly and the metal-to-metal seal holds. We make sure the fitting, ferrule and hose work as one leak-free assembly.