Self-aligning/Spherical seatings

Designed to be centered on the loading axis of an eletromechanical or hydraulic universal test machine. Compression platens provide a hardened surface for complex compression tests in which uniform stress distribution is critical. Spherical seating is accomplished differently depending on the model purchased. For some models, the spherical seat is integral to the compression platen, for others the spherical seat is purchased separately to convert a compression platen to a spherically seated platen. Both types are available in a range of diameters.

Designed to mount directly to the crosshead or table of the frame, these compression platens are available with numerous types of adapters, making them compatible with a wide range of testing platforms.

Principle Of Operation

With a variety of diameters, compression platens fill a wide range of testing needs. They can be used to test a variety of materials, including concrete, metals, composites, and wood. The high Rockwell Scale hardness of the compression platens ensures lack of deformity at pressures up to their capacity. Their inscribed concentric circles ensure proper, centered placement of the specimen, thereby increasing the validity of test results. A level seating surface and even load distribution over the specimen is ensured due to the high tolerance in the flatness of the surface. This aids the operator in attaining valid test results and true failure measurements.

The spherically seated compression platens/seats are designed to accommodate angular displacement (up to 4 degrees) of the top of the specimen with reference to the machine’s loading axis. This is accomplished through the self-aligning action of the seat.

Spherically seated compression platens/seats are typically mounted to the crosshead of electromechanical or hydraulic UTM’s. They are normally used in conjunction with a plane compression platen that is mounted to the table of the machine.

Application Range

  • Type of Loading: static compression 
  • Specimen Material: concrete, metals, wood, composites, or other materials 
  • Specimen Types: cylinders, cubes, fasteners (when used in conjunction with other fixtures), or components
Item Name Capacity Pressure Rating Cat #
Compression Platen - Spherically Seated -Diameter 79 mm (3.125 in) 1000 kN 225,000 lbf 690 MPa 100,000 psi W-2005-A
Compression Platen - Spherically Seated-Diameter 114 mm (4.5 in) 2000 kN 450,000 lbf 690 MPa 100,000 psi W-2005-B
Compression Platen - Spherically Seated-Diameter 165 mm (6.5 in) 4500 kN 1,000,000 lbf 690 MPa 100,000 psi W-2005-C
Compression Platen - Spherically Seated-Diameter 228 mm (9.0 in) 4500 kN 1,000,000 lbf 690 MPa 100,000 psi W-2005-D
Compression Platen - Spherically Seated-Diameter 305 mm (12 in) 5000 kN 1,000,000 lbf 690 MPa 100,000 psi W-2005-F
Compression Platen with Integral Spherical Seat (100mm dia.) 10 kN 2,250 lbf S5724A
Compression Platen with Integral Spherical Seat (100mm dia.) 100 kN 22,500 lbf S5724B
Compression Platen with Integral Spherical Seat (150mm dia.) 100 kN 22,500 lbf S5726B
Compression Platen with Integral Spherical Seat (150mm dia.) 10 kN 2,250 lbf S5726A
Compression Platen with Integral Spherical Seat (200mm dia.) 10 kN 2,250 lbf S5728A
Compression Platen with Integral Spherical Seat (200mm dia.) 100 kN 22,500 lbf S5728B
Compression Platen with Integral Spherical Seat (50mm dia.) 10 kN 2,250 lbf S5722A
Compression Platen with Integral Spherical Seat (50mm dia.) 100 kN 22,500 lbf S5722B
Spherical Seating, 100 kN. 100 kN 22,500 lbf 2501-096
Spherical Seating, 2,000 kN / 1,000 kN. 2000 static, 1000 dynamic kN 450000 static, 225000 dynamic lbf 2840-113
Spherical Seating, 300kN 300 kN 67,500 lbf 2501-118
Spherical Seating, 500 kN / 250 kN. 500 static, 250 dynamic kN 112500 static, 56250 dynamic lbf 2840-112