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ASTM C514
Standard Specification for Nails for the Application of Gypsum Board
Overview
ASTM C514 establishes requirements for steel wire nails specifically designed and manufactured for fastening gypsum board to framing members. This standard covers material properties, dimensions, and performance characteristics to ensure nails can be installed correctly and provide adequate holding power without damaging the gypsum board. Current version: C514-04(2020).
Critical Specifications
- Head: Flat or slightly concave, 0.2375-0.3875 inch diameter with tapered edge
- Shank: Consistent diameter within ±0.003 inch tolerance
- Point: Medium-to-long diamond or needle configuration
- Withdrawal resistance: Equal to 12.5-gauge smooth shank benchmark
Fire-Rated Assembly Compliance
While ASTM C514 doesn't confer fire ratings, it's fundamental for fire-rated assemblies. UL listings specify exact fastener types and spacing to achieve hourly ratings. The head geometry specified in C514 creates shallow dimples that can be effectively concealed with joint compound, critical for Level 5 finishes in architecturally sensitive areas.
Quality Control Importance
A nail with an improperly formed head can tear gypsum board paper, compromising holding power and leading to nail pops. Brittle nails can fracture during installation. Poor withdrawal resistance causes backing out over time due to wood shrinkage or structural movement. Including "Nails shall conform to ASTM C514" in specifications invokes a clear, enforceable quality standard.