Prong Paper Fasteners
Staples & Clips · 5 specs
Direct Answer
Two-Prong Metal Paper Fasteners (standardized with a 2.75-inch / 69.85 mm center-to-center prong spacing) are heavy-gauge tin-plated steel compressors used with self-adhesive prong bases inside classification folders, legal case files, and medical patient charts to secure up to 500 hole-punched sheets.
Source: Federal Specification FF-F-111B / American Hospital Association Record Standards · Last reviewed Aug 28, 2026
Specs
| Center-to-Center Prong Spacing | 2.75 in (69.85 mm standard) |
| Standard Prong Capacities | 1.0 in (approx. 200 sheets) or 2.0 in (approx. 400 to 500 sheets) |
| Compressor Bar Function | Slotted steel slide bar locks over prongs and folds prongs flat under tension |
| Mounting Styles | Factory heat-bonded to pressboard folder or peel-and-stick self-adhesive base |
| Primary Applications | Legal court exhibits, hospital medical records, mortgage closing packets, human resources personnel files |
Medical and Legal Chart Security
Unlike 3-ring binders (which allow loose pages to fall out if dropped), 2-prong fasteners lock documents permanently beneath a heavy steel compressor bar. Combined with top 2-hole punches, they form the backbone of HIPAA-compliant physical medical records and court case folders.