In the world of masonry reinforcement, not all stars are created equal. At Allied Bolt & Screw, we proudly stock and supply Domestic Structural ‘Earthquake’ Retaining Stars and Pattress Plates, engineered for real structural performance, not just decorative flair.
What Are Structural Stars?
Often referred to as Seismic Earthquake Washers, Century Star Washers, or Gib Plates, these star-shaped washers are used as anchor plates or wall washers. They’re bolted to threaded rods that pass through masonry walls, bracing them against lateral movement and bowing—especially important in historic structures or buildings in seismic zones.
Why Allied Bolt Stars Stand Out
Unlike many cheap alternatives on the market, our Structural Star Building Retaining Washers are domestically manufactured in the USA from Ductile Iron cast to ASTM 65-45-12, a high-grade, weldable material often referred to as “semi-steel.”
Beware of imitations: Many stars sold today are low-grade or even strictly decorative cast iron. These can embrittle over time and fail when exposed to structural stress—posing serious risks in real-world applications.
Built for Engineers, Built to Last
- Hot-dip galvanized for maximum corrosion protection
- Architecturally accurate historical patterns in both 5- and 6-point designs
- Available sizes: 5″, 7″, 7½”, 9″, 10″, and 13″
- All stars are in stock and ready to ship
The popular 7½″ 5-point star fits standard ¾″ rods and is commonly paired with:
- ¾″ Ogee Washer
- ¾″ USS Flat Washer
- ¾″-10 Heavy Hex or Square Nut
- ¾″-10 x 6′ Threaded Rod
Larger 13″ stars require 1″ hardware, though we can ream any bore size upon request for custom compatibility. All stars range in thickness from ⅞″ to 2½″ depending on size and configuration.
Fully Stocked Accessories
Need a complete assembly? Allied Bolt has you covered:
- High-strength threaded rods
- Heavy hex and square nuts
- USS and Ogee washers
- Turnbuckles and custom plates
Just check our Rods and Studs page for high-strength options your engineer may require.
Real Reinforcement, Not Just Decoration
Structural stars are often visible features on historic masonry, blending function and form. But whether they’re called pattress plates, hurricane bolts, or tie-backs—what matters most is what they’re made of.
Engineers: Always verify markings. Accept no substitutes.
Trust Allied Bolt for Your Next Structural Reinforcement Project
When you’re protecting the integrity of a structure, shortcuts aren’t an option. With decades of experience and a warehouse stocked with the industry’s best components, Allied Bolt is your go-to source for authentic structural retaining stars.
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