Concrete forming project using Sigma DG 400/400M Series fiberglass form ties

Fiberglass form ties

400/400M Series

Sigma 400 Series is the original fiberglass all thread form tie. Sigma 400M Series shares the same hardware as the 400 Series but the sides are shaved to accommodate easily sliding through the dado slots in the common Symon type handset form systems.
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400/400M Fiberglass Form Ties


This tie started it all. It is the ideal tie for applications such as:

Large mat foundations
Replacing slick pencil rod
Board Form Concrete
Battered Wall Forming
Custom width walls
Multiple Accessories
Water holding tanks with our hydrophilic waterstops
Corrosion Resistant
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400 Series Specifications

Safe working loads (2:1)

  • Standard nut: 3,000 lbs
  • Standard and short nut: 4,000 lbs
  • Double standard: 5,000 lbs

400M Series Specifications

Safe working loads (2:1)

  • Standard nut: 1,500 lbs
  • Standard and short nut: 2,000 lbs
  • Double standard: 3,000 lbs


All Sigma Products and Systems are sold subject to Sigma’s standard warranty and nothing shall expand or extend that warranty. The data contained in this website is considered representative at the time of publication or viewing and believed to be reliable. Sigma reserves the right to make improvements or modifications to its product lineup and processes which may result in changes to specifications. Sigma assumes no liability for the formwork design or construction. Formwork design and pour pressures at the discretion of the formwork supplier, project engineer, or contractor.

Sigma DG 400/400M Series fiberglass form tie
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Vancouver, WA 98660
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