SMGU Series Unidirectional Bearings with Uplift Restraint Device


Goodco Z-Tech spherical bearings can be used for bridges, railway and highway overpasses or buildings where design or installation requires high rotational capacity.



Steel Components

All steel plates conform to CSA G40.20/G40.21, Grade 260W (ASTM A36), 300W, 350W (ASTM A572, Grade 50) or 350A (ASTM A588). Other steel grades can also be supplied, depending on their availability or the specific requirements of the project.

Stainless Steel

The stainless steel conforms to ASTM A240/A240M, Type 304 or approved equivalent. The roughness of the surface in contact with the PTFE, measured in accordance with CSA B95, must not exceed an arithmetic mean of 0.25 μm for plane surfaces and 0.5 μm for curved surfaces.


The aluminum convex component conforms to 6061-T6, T651 alloy, and is anodized according to ASTM B137.45 (25 microns). When the aluminum comes into contact with metallized or galvanized steel, it is properly protected by an isolation pad.

PTFE (Polytetrafluoroethylene/Teflon®)

The PTFE discs are manufactured from pure unfilled sheets, and the PTFE used for the guide bars can be 15% filled with glass fibers. All PTFE materials are chemically etched on one face in order to improve bonding.


The lubricant for the PTFE disc conforms to MIL-S-8660C.

Anchorage System

The fusion-welded studs conform to ASTM A108, Grade 1015, 1018 or 1020. The steel rods conform to CSA G40.20/G40.21, Grade 260W (ASTM A36), 300W, 350W or ASTM F1554, Grade 105 (ASTM A193 B7). The connecting bolts conform to ASTM A325.

Steel Finish

The exposed steel surfaces are zinc-metalized to a minimum thickness of 175 microns, in compliance with CSA G189 (AWS C2.23M/C2.23). It is recommended that a polyurethane-based primer-sealer be used over the zinc-metalized surfaces. Epoxy or vinyl coating systems can also be used. The connection bolts and certain plates are hot-dipped galvanized, in compliance with CSA G164 (ASTM A123).

For technical information, download the brochure.


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