SGTBQLL 50 PCS 1/4"-20 x 20mm Threaded Inserts for Wood are designed to create strong, reusable threads in wood for furniture assembly, repair, and woodworking projects. Each insert is made of zinc-plated carbon steel for hardness, wear resistance, and corrosion protection, offering stable joints even after repeated tightening.
Specifications
Thread type: 1/4"-20 UNC coarse internal thread
Total length: 20 mm; external diameter: 10.5 mm
Drive type: internal hex
Included tools: 8.5 mm twist drill bit and 6 mm hex spanner
Compatibility
Fits 1/4"-20 (inch-based) fasteners; not compatible with metric M6 screws
Usable with hardwood, plywood, MDF, and composite boards
Installation Tips
Pre-drill a pilot hole slightly deeper than the mating screw (1–2 mm extra depth)
Keep the insert vertical and tighten using the included hex spanner
For dense hardwood, slightly enlarge the pilot hole; for softer boards, a small amount of wood glue may be used to increase holding strength
Applications
Furniture repair and assembly
Cabinetry, tables, chairs, and wooden crafts
DIY woodworking and restoring stripped holes
Package Contents
50 × 1/4"-20 × 20 mm threaded inserts
1 × 8.5 mm twist drill bit
1 × 6 mm hex spanner