90 Degree Elbow Metric Male 74 Degree Cone Bulkhead Adapter 6Q9 (74° Cone Bulkhead Fitting)

Why This 90 Degree Elbow Metric Male 74 Degree Cone Bulkhead Adapter 6Q9 Passes the Compliance Gate

The 90 degree elbow metric male 74 degree cone bulkhead adapter 6Q9 is a right-angle bulkhead fitting: both ends are metric male 74 degree cone stud ends, and the body passes through a panel, wall or reservoir shell so the line can be routed from one side of a bulkhead to the other with a single fitting and a lock nut.

That is the function a plain elbow cannot perform. Instead of running a hose through a panel opening and chafing it against the sheet metal, the 6Q9 mounts the joint in the panel, seals metal-to-metal on both cone ends, and lets each side of the bulkhead be assembled, serviced and replaced independently.

Three engineering points decide whether this adapter is the right choice:

• Both legs are metric male 74 degree cone ends with the same thread size, so the cone and the mating seat always belong to the same size family (M12X1.5 with M12X1.5 through M45X2 with M45X2).
• The fitting is offered in four build states, so you can specify exactly what the panel needs: body only 6Q9, body with lock nut 6Q9-LN, body with flared tube kit 6Q9-RN, and body with both 6Q9-LN/RN.
• The bulkhead stem length (dimension B) grows with size, from 52 mm at 6Q9-12 to 96 mm at 6Q9-45, so panel thickness and wrench access can be planned from the published table.

Core Advantages

1. True bulkhead mounting. The body is designed to pass through a panel opening and be locked from the far side.
2. Right-angle routing on the inner face. The 90 degree leg keeps the line parallel to the panel surface instead of standing off it.
3. Four ordering states. Body only, with lock nut, with flared tube kit, or with both, so no surplus parts are bought.
4. Twelve closed sizes. M12X1.5 with 6 mm tube reference up to M45X2 with 34 mm, with published A, B, S1, S2 and S3,S4 values.
5. Metal-to-metal cone sealing on both ends. No elastomer face seal is required on either leg.
6. Traceable production. Batch marking, 100% pressure testing, material certificates and third-party inspection on request.

Especificaciones técnicas

What Is a 90 Degree Elbow Metric Male 74 Degree Cone Bulkhead Adapter?

The 90 degree elbow metric male 74 degree cone bulkhead adapter 6Q9 is a one-piece right-angle body with a metric male 74 degree cone stud end on the outer leg and a threaded through-panel stem on the other, secured by a lock nut on the far side of the panel. The included cone angle is 74 degrees, equal to the 37 degree half angle defined for steel tube fittings in SAE J514, with metric parallel threads rather than UNF threads.

The table lists one thread callout column (E, F, G) and a tube reference column (D1:D2,D3), because the through-panel end and the elbow end share the same thread size in every row.

Connection 1 and Connection 2 (Both Metric Male 74 Degree Cone Ends)

Bulkhead hole diameter and maximum panel thickness are not printed on the series table; send the drawing requirement and we will confirm the value for your size before the order is released.

Dimensional Data

Full Dimension Table (Part Number Matrix)

All dimensions are in millimetres and are reproduced exactly as published for this series. A is measured from the elbow centreline to the end face of the elbow leg, B is the through-panel body length, and the hex values follow the drawing callouts.

Thread Size and Dash Chart

LN adds the lock nut for panel mounting; RN adds the flared sleeve NB500-Q and nut NB200-Q for a flared tube connection. The two suffixes can be combined, for example 6Q9-18-LN/RN.

Material and Heat Treatment

The series drawing does not state a material, so the following describes typical production and is confirmed on the purchase order.

Working Pressure and Operating Envelope

The published drawing carries no pressure column, so no pressure rating is claimed for this series. Working pressure is governed by the port standard together with the hose or tube grade selected, and the finished assembly is only as strong as its weakest member.

• A data sheet referenced to the connection standards (SAE J514 for the 74 degree cone geometry) can be supplied on request.
• Each batch is pressure tested in the standard HENGHUA fitting workflow, with batch records to support the test.
• For safety-critical circuits, rate the assembly from the lowest rated element, including the panel joint.
• Hex size is a wrench consideration, not a pressure grade.

Rango de temperatura

A typical service window for a steel fitting with a nitrile or metal flare joint is -40 degrees C to +120 degrees C. The real limit is set by the seal and the connected hose or tube, not by the fitting body. Outside that window, specify seal and hose compound together and confirm the combination with our engineering desk.

How to Read the Part Number Matrix

The 90 degree elbow metric male 74 degree cone bulkhead adapter 6Q9 code is read in three blocks: series, size and build state.

6 marks the bulkhead family, Q the metric 74 degree cone system, 9 the right-angle body, and the number after the dash is the thread size in millimetres.

Selection and Ordering

Selection Checklist / Decision Table

Confirm the following points before ordering the 90 degree elbow metric male 74 degree cone bulkhead adapter 6Q9.

Cross Reference Service

Send a photograph of the worn bulkhead fitting with the thread outside diameter, the pitch gauge result and the panel hole measurement, and we will identify the correct row free of charge, normally within 24 hours. We do not copy or re-label another company’s brand; we match the interface and the drawing.

Packaging and Logistics

Individual poly bags with size labels or bulk bags per size, carton marking with batch and heat number, mixed-size consolidation in one shipment, and air freight or courier for urgent requirements. Lock nuts, sleeves and nuts can be packed with the bodies or separately, and material certificates and inspection reports travel with the goods on request.

Installation and Fitment Guide

Step-by-Step Assembly

1. Check the panel opening. Confirm the hole diameter and the panel thickness in the drawing; the through-panel stem and lock nut must seat without deforming sheet metal.
2. Fit the body through the panel. Insert the stem from the working side and start the lock nut by hand from the far side.
3. Tighten the lock nut to the panel. Use the specified torque and a backing wrench on the body; over-torque on thin panels will crush the sheet and distort the body.
4. Connect the cone ends. Assemble each 74 degree cone into its mating seat, starting by hand and finishing to the torque value for the thread size.
5. Support the pipework. Both legs must be supported so the panel joint carries no bending load.
6. Leak test at working pressure. Check both cone joints and the panel joint, then re-check after the first thermal cycle.

Torque and Sealing Notes

• Use the published torque value for the thread size and material in use.
• Both legs seal metal-to-metal on 74 degree cone seats, so no sealant is applied to the cones.
• The lock nut is a mechanical clamp, not a seal; a sealing washer is only needed if the drawing calls for one.
• Hold the body with a second wrench on the marked flats so tightening one end does not disturb the panel mounting.
• Renew sleeve and nut whenever a tube end has been re-flared.

Installation Warnings

• ✔ Confirm both halves are 74 degree cone before assembly.
• ✔ Check S1 and S2, S3, S4 against the wrenches you intend to use.
• ✔ Support the pipework on both sides of the bulkhead.
• ✔ Re-test at working pressure after any re-torque of the lock nut.
• ❌ Never install the body without the lock nut where the drawing requires one.
• ❌ Never use the lock nut to pull the body into an undersized hole.
• ❌ Never force a 24 degree or 60 degree cone onto these seats.
• ❌ Never exceed the torque table value to stop a leak; the cone or the panel will be damaged.

Applications and Industries

The 90 degree elbow metric male 74 degree cone bulkhead adapter 6Q9 is specified wherever a hydraulic line has to cross a physical boundary.

Industry tags: hydraulic power units, reservoirs, mobile machinery, marine and offshore, test benches, plant maintenance, tube fabrication, panel building.

OEM Customization and Quality Traceability

HENGHUA produces hydraulic adapters and complete hose assemblies alongside its Globhose hose programme, so this bulkhead adapter can be supplied alone or built into a tested assembly.

• Laser marking and private labelling with customer logo, part number and lot code.
• Custom surface treatment including trivalent zinc and Zn-Ni.
• Drawing or sample based production, with quotation typically within 24 hours.
• Trazabilidad de los lotes from heat number to carton label.
• Testing and documentation: 100% pressure testing, material certificates, and BV or SGS inspection on request.

FAQ

Q: What is the difference between 6Q9 and an ordinary 90 degree elbow? A: The 6Q9 is a bulkhead fitting. Its through-panel stem and lock nut let the fitting be mounted in a panel, wall or tank shell, which a standard elbow such as the 1QT9-SP cannot do.

Q: What do the LN and RN suffixes mean? A: LN adds the lock nut for panel mounting. RN adds the flared sleeve NB500-Q and the nut NB200-Q so the connection can take a flared tube end. They can be combined, for example 6Q9-18-LN/RN.

Q: What is dimension B? A: B is the through-panel body length dimension marked in the series drawing, running from 52 mm in the smallest size to 96 mm in the largest. Use it with the panel thickness to check that the stem and lock nut fit.

Q: Is the bulkhead hole diameter listed? A: It is not printed on the series dimension table. Send the panel drawing or the required hole size for your application and we will confirm the correct value for the size you need before release.

Q: What pressure does the 6Q9 hold? A: The drawing carries no pressure column, so no rating is claimed. Working pressure depends on the port standard and the hose or tube grade; the assembly is only as strong as its weakest member. A standards-referenced data sheet is available on request.

Q: Which materials are available? A: Typical production is forged carbon steel with trivalent zinc plating. Stainless steel 304 or 316L and coatings such as Zn-Ni are available on request.

Q: Is the 74 degree cone the same as a JIC 37 degree flare? A: It is the same sealing family; 74 degrees is the included angle equal to a 37 degree half angle, per SAE J514, but the threads here are metric parallel threads rather than UNF.

Q: How fast can the 90 degree elbow metric male 74 degree cone bulkhead adapter 6Q9 be delivered? A: Standard sizes normally ship in 7 day batches, custom samples in 48 hours, and mixed sizes can be consolidated in one shipment. Quotations are answered within 24 hours.

Solicitar un presupuesto

Send the thread size, the panel hole diameter and thickness, the build state you need (6Q9, -LN, -RN or -LN/RN), the material or coating and the quantity, and we will confirm the correct row of the 90 degree elbow metric male 74 degree cone bulkhead adapter 6Q9 matrix, normally within 24 hours. If the original part is worn or unmarked, send a photograph with the thread measurements and panel hole size and we will match it free of charge.

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