Overview of Shuttering Magnets

Shuttering magnets, widely recognized in the precast concrete industry as magnetic boxes or box magnets, are the standard solution for anchoring formwork, side rails, and blockouts to steel casting beds. The term “magnetic box” reflects the unit’s robust, rectangular steel housing, which encloses a high-performance magnetic array designed for heavy-duty industrial use.

Unlike traditional fixing methods that require welding or drilling, these precast concrete magnets offer a non-destructive holding force. This design not only preserves the surface integrity of your steel tables but also allows for rapid adjustments.

By eliminating mechanical clamping, factories can significantly accelerate the production cycle. This efficiency makes them indispensable across major sectors, including general building construction, infrastructure development, and the rapidly growing modular housing industry.

Shuttering Magnets-Main

How Shuttering Magnets Are Made and Function?

The efficiency of these shuttering magnets stems from a sophisticated integration of mechanical and magnetic components. Inside the protective steel body, a high-performance array of Neodymium magnets and steel plates is arranged to form a concentrated magnetic circuit. When the unit is placed on a clean casting bed, pressing the activation handle lowers this array, eliminating the gap between the magnet and the table. This action channels the magnetic force directly into the steel surface, providing a secure, vibration-resistant hold for side rails and blockouts.

For versatility, the design includes standard fastening points on the top for attaching adapters, while the external housing often features a profile ridge to assist in aligning the magnet with the formwork edge. Deactivation is equally simple; using a release tool to lift the handle retracts the magnetic block. This separation cuts off the magnetic flow to the table, allowing for effortless removal. Maintaining a debris-free surface is critical, as the system relies on direct metal-to-metal contact to deliver its rated holding capacity in precast concrete production.

Structure of Shuttering Magnets
Off State-Shuttering Magnets
“Off” State
On State-Shuttering Magnets
“On” State

Key Benefits of Shuttering Magnets

  • Faster Production Cycles: Shuttering magnets allow for instant fixation and release, replacing slow mechanical methods to speed up your workflow.

  • Protect Your Casting Beds: Eliminate drilling and welding holes on your steel tables. Our precast concrete magnets offer a damage-free hold, reducing long-term maintenance costs.

  • Secure Formwork Positioning: With superior holding force, these magnets keep side rails and blockouts strictly in place, ensuring dimensional accuracy and safety on the production floor.

  • Universal Compatibility: Easily attach adapters to secure wood, steel, or aluminum shutters. Our box magnets are designed to work with almost any formwork setup.

  • Long Service Life: Built to withstand concrete, oil, and vibration, our magnets feature a robust housing that ensures durability in tough precast manufacturing conditions.

Shuttering Magnets Usage Guide

To ensure maximum holding force and safety in precast concrete production, strict adherence to the following procedure is recommended. Please note that any debris between the magnet and the steel casting bed will significantly reduce performance.

  1. Begin by thoroughly cleaning the bottom of the magnetic box and the steel table surface. Removing dust and concrete residue is crucial, as even small particles can create air gaps that compromise the magnetic contact.

  2. Arrange the formwork, including side rails or blockouts, on the casting bed according to your specific design blueprints.

  3. Slide the shuttering magnets into position against the formwork. If your setup requires adapters or clamping plates, secure them to the magnet housing via the integrated screws before activating the system.

  4. Once aligned, press the activation button or handle down firmly to lock the unit onto the steel bed. It is advisable to manually check that the magnet is sitting flush to prevent any movement during vibration.

  5. Proceed with pouring and vibrating the concrete. The system is designed to strictly maintain dimensions under standard precast manufacturing loads.

  6. After the concrete cures, use the specialized release lever to lift the button and deactivate the magnetic field. Remove the unit and clean it immediately to ensure it is ready for the next cycle.

Safety & Usage Notes:

  • For large or heavy precast elements, always calculate the required number of magnets to distribute the lateral pressure evenly.

  • Operators should wear safety gloves to prevent pinching hazards when the powerful magnetic force engages.

Specifications of Shuttering Magnets

Standard Shuttering Magnets

Shuttering Magnets-drawing
Item No. L

(mm)

 W

(mm)

 H

(mm)

 Force Weight

(kg)
(kg) (N) (Lbs)
SM-450 170 60 43 450 4410 991 1.9
SM-900 280 60 43 900 8820 1982 2.9
SM-1300 220 100 43 1300 12740 2863 4.0
SM-1500 278 120 60 1500 14700 3304 6.7
SM-1800 320 120 60 1800 17640 3965 7.4
SM-2100 320 120 60 2100 20580 4625 8.0

Shuttering Magnets with Adapters

Shuttering Magnets with Adaptors-drawing
Item No. L

(mm)

 H

(mm)

 h

(mm)

 W

(mm)

 Force Weight

(kg)
(kg) (N) (Lbs)
SM-900-H 210 150 70 50 900 8820 1982 5.1

Magnetic Array

Magnetic Array-drawing
Item No. L

(mm)

 W

(mm)

 H

(mm)

 Force
(kg) (N) (Lbs)
SWNL100F 100 40 22 450 4410 991
SWNL200F-1 200 40 22 900 8820 1982
SWNL200F-2 200 90 22 1500 14700 3304
SWNL240F-1 240 90 22 1800 17640 3965
SWNL240F-2 240 90 22 2100 20580 4625