Fasteners and Hardware — FAQ
What weight can drywall anchors actually hold?
Quality nylon anchors hold 50-80 lbs in 1/2-inch drywall when installed correctly. However, always derate by 50% for safety—mount 75-pound shelves with 150-pound rated hardware. Weight distribution matters; four anchors sharing a 100-pound load perform better than two overloaded points.
Do I need different anchors for plaster walls?
Yes. Plaster requires expansion anchors with deep threads that grip the lath behind the plaster. Self-drilling anchors often crack plaster. Use a masonry bit to pre-drill, then install expansion anchors rated for plaster/lath systems, typically supporting 30-40 lbs each.
Can I reuse drywall anchors after removing a shelf?
Never reuse plastic expansion anchors—they deform during installation and lose grip integrity. Self-drilling anchors may survive if removed carefully with pliers, but holding strength drops 60%. Always install fresh anchors for heavy loads; it’s a $0.10 part versus a $50 shelf crash.
Why do my anchors keep pulling out of the wall?
Three culprits: under-rated capacity, oversized pilot holes, or hitting a stud cavity edge. Drill pilot holes exactly to anchor diameter. If the anchor spins, remove it, fill the hole with spackle, and relocate 2 inches away. For heavy loads, always find studs or use toggle bolts.
Should I use self-drilling or expansion anchors for kitchen shelves?
Use expansion anchors for kitchen shelves holding dishes and appliances—they handle 75+ pounds reliably. Self-drilling anchors suffice for spice racks under 50 pounds. Kitchens experience vibration from appliances; expansion anchors resist loosening better over time.
How many anchors should I use per shelf bracket?
Use two anchors per bracket minimum—never one. A 36-inch shelf needs three brackets with two anchors each (six total). Space anchors 1 inch from bracket edges to prevent leverage failure. For shelves over 50 lbs, add a third anchor at each bracket’s center point.
