Products » Testing Accessories » Compression Platens » Self-Aligning / Spherically Seated Compression Platens

Spherically seated compression platens are designed to accommodate compression specimens with surfaces that are not completely parallel. During the application of a small pre-load, the spherically seated compression platens self-align up to 4° to the top of the specimen with reference to the machine’s loading axis. For some models, the spherical seat is integral to the compression platen. For others the spherical seat can be added to convert a compression platen to a spherically seated platen.

Compression Platens with Integral Spherical Seat

The hardened surface of these platens ensures no deformation of the platen occurs during testing while the polished finish minimizes friction between the platen and specimen. Platens that have a 100 mm or larger diameter include a locking mechanism to secure the spherical seat into position, ensuring it is parallel with the lower platen. An LVDT deflection sensor may be attached to provide high accuracy strain measurement.

Specifications
Platen Diameter	Load Capacity	Catalog Number
50 mm	10 kN	S5722A
50 mm	100 kN	S5722B
100 mm	10 kN	S5724A
100 mm	100 kN	S5724B
150 mm	10 kN	S5726A
150 mm	100 kN	S5726B
200 mm	10 kN	S5728A
200 mm	100 kN	S5728B

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High-Force Compression Platens

The Industrial Series spherically seated compression platens offer optimal balance of rigidity and self-alignment, ensuring uniform specimen loading. Compression platen combinations can be configured to comply with ASTM C39, C67, C109, C133, C140, C365, AASHTO T22, and other standards.

Specifications
Spherical Seat Diameter	Load Capacity	Catalog Number
79 mm	1000 kN	W-2005-A
114 mm	2000 kN	W-2005-B
165 mm	4500 kN	W-2005-C
228 mm	4500 kN	W-2005-D
305 mm	5000 kN	W-2005-F

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Spherical Seatings

An attachment to convert a compression platen to a spherically seated platen.

Specifications
Capacity	Lower Fitting	Upper Fitting	Catalog Number
300 kN	6 x M10 on 100 mm BC	M48 x 2 fRH (Type llf)	2501-118
Fatigue Rated
500 kN Static 250 kN Dynamic	M48 x 2 fRH (Type llf)	M48 x 2 fRH (Type llf)	2840-112*
* For use with 2840-11x compression platens

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