विभिन्न सामग्रियों के लिए स्क्रू चयन की पूर्ण गाइड। सेल्फ-टैपिंग, वुड स्क्रू, मशीन स्क्रू, और मेसनरी स्क्रू के बारे में जानें।
Screws for Steel
Self-tapping and self-drilling screws for steel: 1. Self-Tapping Screws (Type AB, B, C): - Thread-forming for thin steel - Requires pre-drilled pilot hole - Type AB: Fine thread, thin metal - Type B: Coarse thread, general purpose 2. Self-Drilling Screws (TEK screws): - Drill point eliminates pilot hole - Types: TEK 3, 4, 5 (drill capacity increases) - Fastest installation 3. Machine Screws: - Require pre-tapped holes or nuts - UNC or UNF thread - Used with hex nuts or in threaded holes
Screws for Wood
Screws designed for wood fastening: 1. Wood Screws: - Coarse thread for wood grip - Various head styles (flat, round, oval) - Lengths: 3/4" to 6" - Gauge: #2 to #16 2. Deck Screws: - Coated for exterior use - Star drive (T25) for less cam-out - Self-countersinking head 3. Structural Wood Screws: - Higher load capacity - Approved for structural connections - Often self-drilling points
Screws for Masonry
Screws for concrete and masonry: 1. Concrete Screws (Tapcons): - Requires pre-drilled hole - Thread design cuts into concrete - Various lengths and diameters 2. Masonry Nails: - Hardened steel - Drive into mortar and concrete - Quick installation - Lower load capacity 3. sleeve Anchors (see Concrete Anchors guide) - Expansion anchor principle - Higher loads than concrete screws