Carriage bolts, also known as square neck bolts, feature a smooth, domed head and a square or ribbed neck directly beneath it. This square section locks into the mating material (typically wood or a pre-punched square hole in metal), preventing the bolt from rotating during nut tightening or removal. This allows for one-side installation—ideal when access to the bolt head is limited.
Shaker Screen Bolts – Heavy-Duty Carriage Bolt Variant
Shaker screen bolts are a specialized, high-strength version of carriage bolts, commonly used in vibrating equipment and screening applications. They share the same square neck anti-rotation design but are typically fully threaded and manufactured to higher strength grades (e.g., Grade 5, Grade 8) to withstand dynamic loads and vibration.
Available Head Styles
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Round Head: The most popular style, providing a finished appearance and smooth surface
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Flat Head: Low-profile design for applications where flush mounting is required, such as signs and garage doors
Applicable Standards
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ASME B18.5 (Inch series carriage bolts)
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DIN 603 (Metric carriage bolts – mushroom head square neck)
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ISO 8677 (Metric round head square neck bolts)
Materials
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Low Carbon Steel: For general-purpose applications (flat head carriage bolts)
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Stainless Steel:
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Grade 304 (A2): Excellent corrosion resistance for general outdoor use
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Grade 316 (A4): Superior resistance to pitting and chemicals, ideal for marine environments
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Alloy Steel: For high-strength applications (Shaker screen bolts, Grade 5/8)
Surface Treatments
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Zinc plating (clear or yellow)
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Hot-dip galvanizing
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Black oxide
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Plain finish
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Passivation (stainless steel)
Common Applications
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Wood-to-wood and wood-to-metal connections
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Decking, fencing, and timber structures
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Playground equipment and outdoor furniture
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Signage and garage door hardware
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Shaker screens and vibrating equipment
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Marine and coastal construction (stainless steel)
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