Haihao Group has successfully completed the production and shipment of a batch of Custom Drawn Steel Tube products for a customer in South Africa. Manufactured strictly according to the customer’s engineering drawings, these precision steel tubes are designed for mechanical assembly applications that require accurate dimensions, excellent surface quality, and reliable machining performance.

With decades of manufacturing experience in steel pipes, pipe fittings, and customized machined components, Haihao Group provides tailor-made solutions that meet customers’ exact technical specifications and quality requirements.

Project Overview

The supplied products were manufactured based entirely on the customer’s drawing.

The drawing required several precision machining operations, including:

• Outside diameter: 95 mm (±0.05 mm)
• Inside diameter: 95 mm (±0.05 mm)
• Length: 00 mm (+0.2/-0.2 mm)
• 8 × 45° chamfer on both ends
• Complete deburring after machining
• Internal diameter verification using a 70 mm GO Gauge

Every Custom Drawn Steel Tube was inspected before shipment to ensure full compliance with the customer’s dimensional requirements.

Custom 20# drawn steel tube manufactured according to customer drawing

Precision Manufacturing for Consistent Quality 

Unlike standard mechanical tubing, this project required close dimensional tolerances and accurate machining.

Haihao Group selected high-quality 20# Drawn Steel Tube as the raw material and completed precision turning and finishing using CNC machining equipment. Throughout production, dimensional inspections were performed to maintain consistency from the first piece to the final shipment.

The finished 20# Drawn Steel Tube offers:

• Excellent dimensional accuracy
• Smooth internal and external surfaces
• Uniform wall thickness
• Reliable concentricity
• Good machinability
• Stable mechanical performance

These characteristics make the product suitable for precision assemblies and industrial equipment.

Strict Inspection According to Customer Drawings 

Drawing compliance is one of the most important requirements for customized mechanical components.

For this South African project, Haihao Group carried out multiple quality inspections, including:

• Raw material verification
• Outside diameter measurement
• Inside diameter measurement
• Length inspection
• Chamfer dimension inspection
• Visual inspection after deburring
• GO Gauge verification of the internal diameter
• Final dimensional inspection before packing

Each Custom Drawn Steel Tube was manufactured under strict quality control procedures to ensure interchangeability during customer assembly.

Advantages of 20# Drawn Steel Tubes 

20# mild steel is widely used in precision mechanical manufacturing because of its balanced mechanical properties and excellent processing performance.

Compared with ordinary hot-rolled tubes, 20# Drawn Steel Tube products provide:

• Higher dimensional precision
• Better surface finish
• Improved concentricity
• Easier machining
• Stable mechanical properties
• Cost-effective production for custom parts

These advantages make the material ideal for bushings, sleeves, mechanical spacers, hydraulic components, agricultural machinery, and industrial equipment.

Customized Manufacturing Capability 

Haihao Group manufactures not only standard steel pipes but also custom-machined steel tubes according to customer drawings.

Our production capabilities include:

• Custom outside and inside diameters
• Precision cutting
• CNC machining
• Chamfer machining
• Deburring
• Tight dimensional tolerances
• Mechanical processing according to drawings
• Custom marking and packaging

Whether customers require a single prototype or large-volume production, our engineering team can provide efficient manufacturing solutions.

Why Customers Choose Haihao Group 

Industrial customers choose Haihao Group because we combine manufacturing experience with strict quality management.

Our advantages include:

• More than 40 years of manufacturing experience
• Complete machining and inspection facilities
• Rich experience in custom OEM production
• Strict dimensional quality control
• Fast response to engineering drawings
• Reliable international export service
• Complete documentation available upon request

Our ability to manufacture Custom Drawn Steel Tube products according to customer drawings helps reduce machining work at the installation site while improving assembly efficiency.

Looking for a Reliable Custom Steel Tube Manufacturer? 

If your project requires Custom Drawn Steel Tube, 20# Drawn Steel Tube, or other precision machined steel tubing manufactured according to drawings, Haihao Group can provide customized production, strict quality inspection, and reliable global delivery.

Our engineering team is ready to support your next mechanical or industrial project with tailor-made steel tube solutions.