Rectangular Tube Inserts – Custom Plastic & Threaded Inserts for Rectangular Metal Tubing
Engineered for Precision Fit & Long-Term Assembly Reliability
- ✓Fits square & rectangular metal tubing from 20×20 mm to 100×50 mm, standard and custom dimensions
- ✓Available in LDPE, HDPE, Nylon, PVC, ABS – plain, ribbed, and threaded insert types
- ✓Wall-thickness compatibility from 0.8 mm to 3.0 mm
- ✓Custom color, surface finish (matte/glossy), and logo moulding
- ✓MOQ: 1,000 pcs for stock designs; 5,000 pcs for custom tooling
- ✓Tooling lead time: 7–12 days; sample dispatch: 3–5 days
- ✓Production lead time: 7–20 days for bulk orders
- ✓Export packaging: carton boxes, palletised, or customer-specified retail packaging
- ✓Serving furniture, fitness, medical, retail display, and industrial assembly buyers globally
Engineering Specifications
| Specification | Available Options |
|---|---|
| Tube Shape | Rectangular, square |
| Tube Outer Dimensions (Custom) | 20×20 mm to 100×50 mm and non-standard sizes |
| Wall Thickness Compatibility | 0.8 mm, 1.0 mm, 1.2 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm |
| Insert Type | Ribbed (press-fit), threaded, snap-fit, non-threaded flush plug |
| Material Options | LDPE (flexible, economic), HDPE (rigid), Nylon 6/6 (high-wear), PVC, ABS (good surface finish) |
| Material Hardness | Shore A 80–95 (LDPE/HDPE); Shore D 50–80 (Nylon, ABS, PVC) |
| Colour | Black (standard), white, grey, beige; custom Pantone-based colour matching available |
| Surface Finish | Matte, gloss, textured |
| Operating Temperature Range | -20°C to +80°C (LDPE); -40°C to +120°C (Nylon) |
| UV Resistance | Standard grades; UV-stabilised compounds available for outdoor use |
| Flame Retardancy | Available (UL94 V-0 upon request) |
| Customisation | Dimensions, rib geometry, wall thickness grip range, logo/text moulding, insert colour |
| MOQ | 1,000 pcs (standard); 5,000 pcs (custom tooling) |
| Sample Availability | Yes – free existing samples; custom samples charged at tooling cost |
| Lead Time (Tooling) | 7–12 working days |
| Lead Time (Production) | 7–20 working days depending on order volume |
| Packaging | Bulk in polybags, cartons; custom retail-ready packaging available |
| Export Regions | North America, Europe, Southeast Asia, Middle East |
Industries That Rely On Our Inserts
Furniture Manufacturing
Floor-protective tube end caps for office chairs, school desks, steel table legs, and shelving units. Standard colour matching to frame finishes; anti-scratch and anti-slip profiles available.
Fitness & Gym Equipment
Shock-absorbing inserts for weight benches, squat racks, cable machines, and steel tubing frames. High-density PE and Nylon inserts offer impact resistance and floor protection.
Retail Display & Shopfitting
Clean, flush, or threaded tube inserts for retail displays, gondola shelving, and modular metal racking. Aesthetic finishes with logo moulding for brand reinforcement.
Medical & Laboratory Equipment
Hygienic tube inserts for medical carts, patient chairs, and laboratory furniture. Smooth, sealed surfaces compatible with wipe-down cleaning; non-porous materials available.
Industrial Racking & Material Handling
Heavy-duty rectangular tube inserts for warehouse racking, trolleys, and metal containers. Reinforced ribbed designs withstand repeated impacts and protect concrete floors.
Trailers & Automotive Accessories
Weather-resistant inserts for trailer frames, tie-down points, and structural box sections. Nylon and UV-stabilised materials for outdoor exposure.
Modular Structures & Exhibitions
Temporary structures, exhibition stands, and aluminium profile assembly systems. Fast press-fit insertion and reliable retention without adhesives.
Material Selection Guide
Help your team select the optimal material for your application environment and performance requirements.
| Material | Key Characteristics | Recommended Applications |
|---|---|---|
| LDPE (Low-Density Polyethylene) | Flexible, good impact absorption, low cost | Office furniture, school chairs, indoor tube plugs |
| HDPE (High-Density Polyethylene) | Greater rigidity, good chemical resistance | Industrial racking, outdoor enclosures |
| Nylon 6/6 (PA66) | Excellent wear resistance, high strength, high-temperature tolerance | Fitness equipment, heavy machinery, trailer frames |
| PVC (Polyvinyl Chloride) | Cost-effective, good surface hardness | General-purpose tube protection, retail displays |
| ABS (Acrylonitrile Butadiene Styrene) | Good surface finish, rigid, impact-resistant | Visible consumer products, branded furniture components |
Need help selecting? Send us your tube dimensions, application environment, and volume – our engineering team will recommend the optimal material and insert design for your assembly.
Custom Engineered Solutions
Most standard tube insert catalogues won’t match your exact tube dimensions and assembly requirements. We specialise in custom-engineered solutions tailored to your needs.
What We Can Customise:
- ✓Exact tube dimensions – Any rectangular or square profile, metric or imperial
- ✓Wall-thickness-specific ribs – Optimised grip range for 0.8 mm to 3 mm wall tubing
- ✓Insert type – Flush, ribbed, threaded, snap-fit, or multi-stage retention
- ✓Material formulation – UV stabilised, flame-retardant (UL94 V-0), anti-static, food-contact compliant grades
- ✓Colour – Custom Pantone-matched colour; metameric matching to powder-coated frames
- ✓Logo & marking – Moulded-in branding, cavity numbers, part numbers
- ✓Packaging design – Kit packaging, layered cartons, ESD-safe packing for export
Tooling & Custom Part Process
- Submit tube sample or 2D drawing (PDF/DWG/STEP)
- Our engineering team evaluates feasibility, retention force, and tool design
- DFM report and quotation within 2 working days
- Mould fabrication (7–12 days)
- First article samples for approval
- Mass production with QA dimensional reports
We maintain in-house tooling, which means faster iterations and lower tooling costs compared to trading-company sourcing.
Manufacturing & Quality Capability
Why buyers trust our manufacturing process for consistent, reliable parts:
Frequently Asked Questions
1. What sizes of rectangular tube inserts do you manufacture?
We can manufacture inserts for any rectangular or square tube profile. Common sizes include 20×40 mm, 25×50 mm, 30×30 mm, 40×80 mm, but we produce customer-specific sizes up to 100×50 mm and beyond.
2. Can you match an imperial tube size (e.g. 1″×2″)?
Yes. We regularly work with both metric and imperial dimensions. Please provide your tube’s outer dimensions and wall thickness.
3. Which types of rectangular tube inserts are available?
We produce ribbed press-fit inserts, threaded inserts, non-threaded plugs, snap-fit inserts, and flush end caps. The design is customised to your retention and assembly requirements.
4. How do I select the right material for my application?
It depends on mechanical stress, environment, and aesthetic needs. LDPE suits indoor furniture; Nylon is better for high-wear, outdoor, or heavy-duty conditions. Our engineering team can guide your selection.
5. Can you supply rectangular tube inserts with threaded bushings?
Yes. We offer threaded rectangular inserts with embedded brass or steel nuts for mechanical fastening applications, such as levelling feet attachment.
6. How do you ensure a tight fit without falling out?
Retention is controlled by rib geometry, material flexibility, and rib interference with the tube inner profile. We can design insert ribs specifically for your tube’s wall thickness and provide a sample for testing.
7. What is the minimum order quantity (MOQ)?
MOQ is 1,000 pieces for standard designs. For custom tooling, MOQ is typically 5,000 pieces per size, negotiable based on material and complexity.
8. Do you offer free samples?
We provide existing stock samples free of charge (customer covers freight). Custom samples require tooling investment but are produced and shipped within 7–12 working days after mould approval.
9. Can you mould our brand logo onto the insert?
Yes, we can mould text, logos, and cavity numbers on the visible surface or inside the insert without affecting structural performance.
10. Are your rectangular tube inserts suitable for outdoor environments?
Yes, when manufactured from UV-stabilised Nylon, HDPE, or specialised formulations. Specify your outdoor requirement during enquiry, and we will recommend the correct compound.
11. What wall thickness range do your inserts fit?
Standard designs cover 1.0–2.0 mm wall thickness. For thinner (0.8 mm) or thicker (up to 3.0 mm) walls, we adjust rib geometry to maintain secure retention.
12. What are your packaging and shipping capabilities?
Bulk packaging in polybags and export cartons is standard. We also offer retail-ready packaging, barcoded labels, and palletised shipping. Door-to-door and FOB terms are available.
13. How do I send a tube insert RFQ?
Please send us your tube outer dimensions, wall thickness, material requirement, quantity, and any special features (threaded, colour, logo). We will respond with a technical proposal and quotation within 1 business day.
Get Your Custom Rectangular Tube Insert Quote
Get a tailored solution, not just a product. Whether you need a standard floor-protective cap or an engineered threaded insert for a machine frame, we provide a full engineering-to-production service.
To receive a quote, please provide:
- ✓Tube outer width × height (mm or inch)
- ✓Wall thickness
- ✓Material preference or application environment
- ✓Insert type (plain, ribbed, threaded, etc.)
- ✓Estimated annual quantity
- ✓Any special requirements (colour, logo, UV protection, etc.)
Contact our engineering sales team:
