40 Pcs 1/4"-20 x 3/4" Rubber Well Nuts Neoprene Expansion Brass Nuts

Features: Rubber exterior provides electrical insulation between fastener and substrate, lowering the risk of galvanic corrosion when dissimilar metals join. Combined with a brass insert, this arrangement preserves thread integrity while minimizing electrochemical interaction. Expanding well nut design produces radial expansion inside the hole when tightened, delivering reliable pull-through resistance on thin-walled or flexible materials. The rigid brass thread and deformable rubber sleeve secure attachments without thick substrates. Specifications: Material: rubber, brass Color: black Size: 1/4"-20 x 3/4" Package includes: 40 x Rubber well nuts Notes: Manual measurement, please allow slight errors on size. The color may exist a slight difference due to different screen displays

• Construction: these rubber well nuts have a brass-threaded insert with a black rubber sleeve, size 1/4"-20 x 3/4"; Brass core resists corrosion and wear; Finely formed threads support repeated disassembly and reassembly; Rubber jacket shields contact and reduces galvanic reactions for stable long-term performance
• Easy Installation: standard 1/4"-20 internal thread is compatible with common bolts and can be applied to metal, plastic and composite panels; After drilling, press or insert into the hole and tighten the external bolt to achieve secure engagement; Compact profile suits confined spaces
• Wide Application Range: suitable for furniture assembly, chassis and panel fastening, automotive interior trim, marine fittings, HVAC units, signage and lighting installations; Versatile performance across industries makes it applicable wherever vibration resistance and neat appearance are required
• Surface Protection and Vibration Damping: black rubber sleeve cushions contact points, isolates metal surfaces and dampens vibration to reduce loosening and noise transmission; The elastomer jacket also compensates for minor panel irregularities, improving joint stability under dynamic conditions
• Practical 40-piece Packaging: supplied in a 40-piece set with a discreet black finish for straightforward inventory and spare-part management; Compact packaging simplifies on-site replacement and batch operations, supporting organized storage and efficient field servicing routines