The robust solution for professional steel tube constructions
Pipe inserts for rectangular tubes made of high-quality Zamak (zinc die-casting) offer the ideal connection solution for square tubes and steel frames. As technically robust connecting elements, they ensure secure threaded connections in furniture making, shopfitting, and mechanical engineering – ideal for demanding industrial applications in mechanical and plant engineering as well as metal processing.
Your advantages with Zamak tube inserts for rectangular tubes
✓ Precise fit Precise dimensions for common square tubes – form-fitting and dimensionally accurate.
✓ Twist-proof The ribbed square profile prevents rotation in the pipe.
✓ High-strength zinc alloy DIN EN 1774 – Tensile strength 280 MPa for maximum load capacity
✓ Corrosion-resistant The natural oxide layer provides lasting protection against rust.
✓ Quick assembly Simple press-fit installation without additional fasteners
✓ Made in Germany Precision manufacturing according to DIN ISO 9001:2015
Manufactured using zinc die casting, suitable for rectangular tubes, standard thread M10, special thread M8, collar height 5 mm, overall height 22 mm.
| Article | Dimensions | For pipe wall thickness | thread | VPE |
| B-709 | 25/25/1.5 mm | 1.5 mm | M10 | 400 |
| B-709 | 25/25/2.0 mm | 2.0 mm | M8 | 400 |
| B-709 | 25/25/0.0 mm | 2.0 mm | M10 | 400 |
| B-709 | 30/30/1.5 mm | 1.5 mm | M10 | 400 |
| B-709 | 30/30/2.0 mm | 2.0 mm | M10 | 400 |
| B-709 | 30/30/2.5 mm | 2.5 mm | M10 | 400 |
| B-709 | 40/40/1.5 mm | 1.5 mm | M10 | 200 |
| B-709 | 40/40/2.0 mm | 2.0 mm | M10 | 200 |
| B-709 | 40/40/2.5 mm | 2.5 mm | M10 | 200 |
| B-709 | 50/25/2.0 mm | 2.0 mm | M10 | 300 |
| B-709 | 50/30/2.0 mm | 2.0 mm | M10 | 200 |
| B-709 | 50/30/2.3 mm | 2.3 mm | M10 | 200 |
| B-709 | 50/30/2.5 mm | 2.5 mm | M10 | 200 |
| B-709 | 60/30/2.0 mm | 2.0 mm | M10 | 200 |
| B-709 | 60/30/2.5 mm | 2.5 mm | M10 | 200 |
| B-709 | 80/30/2.5 mm | 2.5 mm | M10 | 200 |
Why Zamak? The technical advantages
High-strength zinc alloy for maximum load-bearing capacity
Zamak tube inserts for rectangular tubes offer outstanding mechanical properties due to their optimized material composition, making them the first choice for demanding industrial applications.
Mechanical performance data:
- Tensile strength: 280 MPa (approx. 50 % higher than aluminum)
- Compressive strength: 415 MPa – withstands extreme loads
- Brinell hardness: 82-100 HB for wear-resistant threaded connections
- E-modulus: 85,000 MPa (high stiffness)
- Density: 6.7 g/cm³ – good strength-to-weight ratio
Practical advantage: The square shape ensures maximum torsional stability through positive-locking anchoring in the rectangular tube. The ribbed outer profile with 6-8 longitudinal ribs ensures a permanent, force-fit connection without adhesives.
Why stiffness is important:
- Minimal deformation under load
- Precise dimensional stability under continuous load
- No settling symptoms under continuous load
- Constant clamping force throughout its entire lifespan
Zamak is NOT a problem with:
Controlled indoor environments (10-30°C, normal humidity):
- Normal production areas, workshops
- Air-conditioned production areas
- Standard industrial environments
Customized to meet customer needs with constant air movement:
- Material does not age
- Properties remain constant.
- No UV damage from aging
Application areas: Where Zamak rectangular tube inserts are the best choice
Furniture industry & office equipment
Typical applications:
- Steel tube frames for tables, chairs and benches
- Shelving systems made of square tubes (warehouse, archive, office)
- Desk and workstation designs
- Modular storage systems
- Roll containers and mobile furniture units
Why Zamak is ideal here:
- High load capacity thanks to robust threaded connection
- Durable mounting of leveling feet and casters
- Corrosion protection for long-term use
- Precise height adjustment thanks to an exact thread
- 20 % lower weight than pure steel constructions
Advantage:
- Higher load-bearing capacity for medium loads
- Low weight simplifies assembly/conversion
- Corrosion-resistant for long service life
- Vibration damping
- Cost-efficient for large production runs
Shopfitting & Shop Systems
Typical applications:
- Merchandise presenters and display systems made of rectangular tubing
- Modular shop fittings with square frame
- Exhibition furniture and sales counters
- Clothes racks and display stands
- Flexible shelving systems for retail
Why Zamak is ideal here:
- Flexible assembly and quick conversion possible
- Rotational stability during frequent adjustments
- Various surface treatments (chrome-plated, painted)
- Perfect optics for visible areas
- Durable and resilient in public areas
Advantage used:
- Easy assembly with standard tools
- Steel does not attract condensation or scratches (unlike anodized aluminum).
- Footplates/gliding surfaces made of PA are available to match.
Practical experience in testability/lifespan: PA-Zamak is suitable for 24/7 shop window PA applications.
Exhibition stand construction & event structures
Typical applications:
- Exhibition stands with square tube constructions
- Mobile exhibition systems for trade fairs
- Disassemblable presentation walls
- Portable information stands and counters
- Event furniture and temporary facilities
Why Zamak is ideal here:
- Can be mounted multiple times without wear
- Easy disassembly for transport
- Robust connection despite frequent assembly/disassembly
- Presentable appearance even after many uses
- Cost-effective when reused
Mechanical and plant engineering
Typical applications:
- Machine frames and base frames made of square tubes
- Transport devices and trolleys
- Protective enclosures with steel frame construction
- Workplace and assembly systems
- Conveyor technology and handling systems
Why Zamak is ideal here:
- High vibration damping reduces vibrations
- Self-lubricating properties minimize wear.
- Precise tolerances for complex assemblies
- Durable enough for 24/7 operation
- Temperature resistant up to +95°C
Metalworking & Steel Construction
Typical applications:
- Custom steel structures with square tubes
- Frames for special machines
- Frame construction for industrial plants
- Transport and storage systems
- Workshop equipment
Why Zamak is ideal here:
- Complies with common DIN standards for square tubes
- Cost-effective alternative to welded constructions
- Subsequent modifications are possible
Technical Consulting & Support
Are you unsure which pipe insert is the right one?
Our technical team will assist you with your selection:
- Material consultation Choice between Zamak, steel or plastic
- Size determination Optimal thread and pipe size
- Assembly solutions Advice on press-in tools and accessories
Frequently Asked Questions (FAQ)
Can I retrofit pipe inserts?
Yes, Zamak tube inserts can easily be pressed into existing square tube constructions, provided the tube end is accessible. Many existing machines can be retrofitted in this way (e.g., sliding screw constructions improved or subsequently pressed in).
How do I adjust pipe inserts correctly?
Assembly in 5 steps:
- Roughly position the shelf and tighten the feet slightly.
- Place spirit level on shelving system
- Fine adjustment of height via polyamide M10 spindle screw
- Optional: Tighten the lock nut
- Check alignment in both axes
Are the pipe inserts suitable for outdoor use?
Yes, Zamak pipe inserts are generally suitable for outdoor use:
✓ Natural corrosion resistance due to oxide layer
✓ Optional electroplating (galvanized/chrome-plated) for increased protection
✓ Temperature range covered -40°C to +95°C
A notice: For permanent exposure to moisture/salt water, choose a galvanized version.
Are you looking for suitable tube inserts for rectangular tubes for furniture making, shopfitting, exhibition stand construction or mechanical engineering?
Contact us for a personal consultation: