Metric Male 74° Cone Adapter 1Q — Straight Double-Ended 74° Cone Stud Adapter

Why This Metric Male 74° Cone Adapter Passes the Compliance Gate

The 74° cone is a wide-angle seat, which means a small angular error translates into a large radial gap — a 1° deviation on a 20 mm cone moves the contact band by a measurable fraction of a millimetre, and that is enough to turn a sealed joint into a weeping one. Every 1Q metric male 74° cone adapter is therefore machined with the cone turned on a CNC lathe in the same setup as its thread, measured for included angle and seat diameter on a profile projector, and gauged for thread fit 6g go / no-go. The inspection record travels with the lot, and the cone can be re-verified years later against the same drawing.

The part is a straight (180°) adapter with a metric male 74° cone end on both sides, of equal size on each end in the standard range. It is used to join two 74° cone connections — typically two tube ends carried by sleeves and nuts — or to place a 74° cone connection onto a 74° cone port. The catalogue also lists the 1Q-RN version of the same body, supplied complete with cutting ring and nut.

Core Advantages

• Wide-angle metal seat. The 74° cone seals on a broad metal-to-metal band rather than a thin lip, so it tolerates the slight misalignment that a tube run assembled in the field always has. No elastomer sits in the sealing path.
• Double-ended simplicity. One adapter, two identical 74° cone ends, one part number per size — no orientation, no handedness, no assembly sequence to get wrong.
• Threads matched to the cone. The cone and its thread are cut in one setup, so seat concentricity is a machining result rather than an assembly assumption.
• Full size range. Tube 5 mm through 34 mm, with M10×1 up to M45×2.
• Complete-set option. The /RN variant adds the cutting ring (sleeve NB500-Q) and nut (NB200-Q) so the connection can be ordered as one kit.

Technical Specifications

What Is a Metric Male 74° Cone Adapter?

It is a straight hydraulic adapter whose two connections are metric male studs with an external 74° cone. The cone seats against a matching internal 74° cone in the mating component; the mechanical load and the seal are both carried by the cone faces. On the tube side, the mating end is normally a tube carried by a sleeve (cutting ring or bite-type ferrule) and a nut, which presses the tube’s cone into the adapter’s cone.

Cone Geometry — 74°, 60° and 37° Are Not Interchangeable

This is the single most important thing to check before buying a cone adapter. Three cone systems dominate hydraulic practice and they do not interchange:

Different included angles mean different contact diameters and a different seat position along the axis. A 74° male in a 60° female port makes contact on an edge instead of a face; a 37° flare against a 74° seat touches on a ring and will not hold pressure at temperature. Such joints very often pass a short static test and then weep once the system is hot — the worst possible failure mode, because it is discovered after the machine is assembled. Always confirm the seat angle of both halves of the joint.

Dimensional Data

In the drawing, E and F are the thread designations of the two ends, D1, D2 the tube outside diameters that the 74° connection serves, A and B the two end lengths measured from the hex to the respective end face, L the overall length, S1 the across-flats hex of the centre body and S2, S3 the end hexes used when holding the adapter.

Because the adapter is straight and equal-ended, A and B are normally identical in the standard range; the catalogue keeps them as separate columns because the reducing and special versions differ. In the 1Q-RN version the nut and sleeve add to the overall length, so quote the mounting envelope from the RN drawing, not from the plain adapter, when space is tight.

Full Dimension Table (Part Number Matrix)

Values as published in the HENGHUA catalogue drawing. Dimensions in millimetres.

Thread Size and Dash Chart

The 1Q-30 and 1Q-30E pair is worth noting: the same 20 mm connection is offered with M30×1.5 and with M30×2. They are not interchangeable at the port, and the overall length differs (57 mm against 63 mm). Confirm the pitch on the mating part before ordering.

Material and Heat Treatment

Carbon steel bodies, machined from bar or forged, hardened according to pressure class and plated in trivalent chromium or zinc-nickel. Stainless 304 / 316L is available to order. Cones are cut and finished in the same setup as the thread to hold concentricity.

Working Pressure and Operating Envelope

The catalogue table for this family publishes dimensional data. The working pressure of a 74° cone joint is set by the assembly as a whole — tube wall thickness, sleeve type, nut and the mating seat — so the practical rating is confirmed for the specific tube, sleeve and nut combination rather than from the adapter alone. A 4:1 burst ratio is typical of the steel body.

Temperature Range

−40 °C to +120 °C for standard components; up to +200 °C with FKM in associated seals. The 74° cone joint itself has no elastomer in the sealing path, so the fluid and the tube material usually set the limit.

How to Read the Part Number Matrix

1Q-22 reads: family 1Q (metric male 74° cone, straight adapter), size 22 = 14 mm tube / M22×1.5 on both ends. 1Q-30E is the M30×2 version of size 30 (20 mm tube). Add the suffix /RN to order the same adapter as a complete set with cutting ring and nut — for example 1Q-22/RN — where the sleeve and the nut are catalogue items NB500-Q and NB200-Q respectively.

Selection and Ordering

Selection Checklist / Decision Table

Cross Reference Service

Send the OEM number, the tube OD, the thread callout and a photograph of the mating seat. We confirm the cone angle, the thread pitch (including the ×1.5 against ×2 trap at size 30) and return a mapped part number.

Packaging and Logistics

Thread protectors on both ends, plastic bag, carton and pallet; certificates referenced to the heat number. Air, sea and express shipping available.

Installation and Fitment Guide

Step-by-Step Assembly

1. Confirm the mating seats are 74° cone. Do not accept “close enough” — measure the angle if the part is unmarked.
2. Clean the cone faces. Any swarf or paint film becomes the sealing surface, and the joint will leak.
3. Lubricate the threads lightly; never apply sealant to the cone.
4. Start both threads by hand to avoid cross-threading the fine metric pitch.
5. Hold the adapter with the S1 or S2 hex and torque each end to its specified value. Where a sleeve-and-nut connection is used, follow the nut torque for that sleeve size.
6. Re-check both joints after the first thermal cycle and after any maintenance that disturbs the assembly.

Torque and Sealing Notes

Both ends are metal-to-metal 74° cone joints and neither uses tape or compound. Under-torque leaves the cone short of full contact on the wide seat; over-torque deforms the cone and the mating seat, and a deformed wide-angle cone cannot be recovered by tightening further. Because the 74° seat is wide, it is more tolerant of alignment but less forgiving of a damaged face than a narrow cone — inspect rather than re-tighten.

Installation Warnings

• Do not mix 74°, 60°, 37° and 24° cone components.
• Do not use thread sealant on any cone seat.
• Do not reuse a cone that has been over-torqued, galled or dented.
• Do not use the adapter as a structural support; support the tube run separately.
• Do not assume a /RN set and a plain adapter have the same installed length.

Applications and Industries

Metric 74° cone adapters are used on Chinese and Japanese hydraulic machinery, machine tools, presses, injection-moulding machines, construction equipment, agricultural machinery, hydraulic power units, shipboard systems and test benches — anywhere the 74° cone system is already established. The metric male 74° cone adapter is the standard straight link that joins two 74° cone tube ends or brings a 74° cone connection onto a matching port.

OEM Customization and Quality Traceability

Reducing versions, non-standard lengths, special hex, alternative materials, other thread pitches and customer plating are produced to drawing. Incoming material verification, first-article inspection, thread gauging, cone angle and seat diameter measurement on a profile projector, proof pressure testing on sample lots and final inspection are recorded against the order, with EN 10204 3.1 certificates on request.

FAQ

What is a 74° cone? A wide-angle metal cone seat (74° included) that seals on its cone face, used with a sleeve and nut on the tube side in Chinese and Japanese hydraulic practice.

Will a 74° cone adapter fit a JIC or BSP port? No. 37° flare, 60° cone and 74° cone are different geometries with different contact positions and threads.

What is the difference between 1Q-30 and 1Q-30E? Thread pitch — M30×1.5 against M30×2 — and overall length (57 mm against 63 mm).

What does /RN mean? The adapter supplied as a complete set with cutting ring and nut (sleeve NB500-Q, nut NB200-Q).

Do I need a sealant? No. The 74° cone is a metal-to-metal seat.

Can I mix sizes? The standard range is equal-ended. Reducing versions are available to order.

Solicitar um orçamento

Send the part number, the tube OD, the thread pitch, the material, the quantity and the working pressure. We will confirm the cone angle, the pitch version and whether the /RN set is required, and quote with the inspection documentation included.

Related products in this range: metric male 74° cone adapter with bonded seal 1QL · metric 74° cone to ISO 6149-3 metric male adapter 1QH · metric male 74° cone to BSPT male adapter 1QT-SP · metric male 74° cone plug adapter 4Q · metric male 74° cone bulkhead adapter 6Q.

Browse the full Hydraulic Adapters range for the complete family, or contact us to request a quote, mill test reports, and samples.