Rectangular Tube Fittings: Product Selection, Materials and Installation

Rectangular sections have unequal face widths, so each elbow or adjustable joint needs a defined bend plane. Joiners and closures must preserve the intended long-face orientation. Hengke organizes this range into 5 product groups so that buyers can compare the intended connection, mounting method and component geometry before requesting a quotation. The product pages provide a starting point for discussion; the approved drawing and project specification establish the final supply requirements.

Understanding the Product Arrangement

Provide width, height, wall thickness and corner radii. Identify wide-face or narrow-face bends, check insertion depth and pivot clearance, and show tube orientation relative to base fixing holes. Start with the function of the complete assembly, then identify the components needed at each interface. A photograph can show the general shape, but it does not establish hidden dimensions, fastener engagement, seal compatibility or the suitability of the supporting structure. Provide a marked drawing or installation sketch when the connection cannot be described clearly by a product name.

Materials and Surface Finish

The material selection for this range is 304 or 316 stainless steel to specification. State the required material standard and any documentation or verification needed with the order. The selected grade must suit the actual exposure, contact materials and cleaning regime. Stainless steel still needs appropriate cleaning and drainage; a polished appearance does not remove the need to select a suitable alloy.

Agree the visible finish, texture and permitted variation before production. When parts are installed together, specify whether their grain direction or polished appearance must match. Protect finished surfaces during transport and fitting, and avoid contamination from unsuitable tools or neighboring fabrication work. Where elastomers, glass, coatings or mechanisms are included, define their requirements separately from the metal component.

Product Groups in This Category

Compare the following groups by their intended function and connection details. Similar external outlines can conceal different mounting dimensions or operating arrangements. Follow the individual product links for the corresponding specification and drawing-review information.

• Rectangular Tube Elbows: elbow retaining the orientation of rectangular tube faces. Specify width, height, wall thickness and bend plane; avoid confusion between strong-axis and weak-axis changes of direction.
• Rectangular Tube Inline Joiners: straight connector matching rectangular tube bores. Match both internal dimensions and corner radii; align the long faces and maintain the required insertion length.
• Rectangular Tube End Caps: closure matching a rectangular tube end. Provide width, height, wall thickness and cap projection; select a compatible retention method and finish.
• Rectangular Mounting Flanges and Base Plates: flange or base plate for rectangular upright tubing. Specify tube orientation, bolt pattern and plate thickness; review anchor clearance on the narrow and wide faces.
• Adjustable Rectangular Tube Joiners: adjustable joint for rectangular handrail sections. Define the adjustment plane, installed angle and face orientation; check pivot clearance and the locking arrangement.

Dimensions, Fit and Installation Review

The principal selection factors are section width, height and bend plane. Identify the dimensions that control assembly and distinguish these from general envelope dimensions. Show the mating parts, installation orientation, available tool space and any movement required in service. State nominal sizes together with the tolerances or fit requirements that make the parts work together.

For railing and glass installations, coordinate surveyed levels, supporting structure, fixing positions and the project barrier requirements. A component should be reviewed as part of the complete assembly; appearance, size or an adjustable joint does not establish system capacity. Trial-fit the first assembly before committing to repeated drilling, cutting or installation.

Manufacturing and Inspection

The manufacturing route may include casting or fabrication, machining and finishing, with the exact operations selected for the approved part configuration. Review critical interfaces and finishing allowances before manufacture. Required inspection can include dimensional checks, visual surface examination and verification of specified materials or operating features. Any special testing, traceability or load verification must be agreed in the purchase specification.

Use the same drawing revision for quotation, sample review and production acceptance. If a sample is supplied, identify which dimensions or features it defines and which requirements remain on the drawing. Record approved changes so repeat orders retain the same mating interfaces, finish and inspection basis.

Information for a Product Quotation

Send a clear specification with the following details so the correct configuration can be reviewed:

• Product group, drawing revision and required quantity.
• Material grade, surface finish and visible appearance requirements.
• Connection dimensions, mounting pattern, mating parts and installation orientation.
• Service environment, functional requirements and any agreed testing or documentation.
• Delivery schedule, packaging needs and sample approval requirements.

Use the enquiry form beside this article or contact Hengke Casting with your drawings and installation information. We will review the component configuration, manufacturing requirements and inspection needs before preparing a quotation.