Plastic Nuts vs Heat-Insert Brass Nuts Comparison

Plastic Nuts vs Heat-Insert Brass Nuts Comparison

Two common ways to form internal threads in plastic housings: use all-plastic nuts (nylon hex/flange nuts), or heat-insert brass inserts into bosses then use machine screws. Each fits different scenarios.

Strength and Temperature

Heat-insert brass threads are metal with high tensile and torque-out strength, handling larger preload and near-brass temperature limits—good for highly loaded or near-heat areas. All-plastic nuts are weaker, creep under load and relax at high temperature.

Cost and Process

All-plastic nuts need no inserts—simple, light, insulating, rust-free and low cost. Heat inserts require post-molding hot- or ultrasonic installation, adding process and insert cost, but allow repeated disassembly without damaging plastic.

Selection Advice

Choose all-plastic (nylon 66) nuts for light load, infrequent removal, low cost and insulation. Choose heat-insert brass for high load, repeated service or near heat. Design boss wall thickness to insert outer diameter to avoid weak bonding or cracking.

The plastic fastener range supplies nylon nuts and heat-insert brass solutions.