Flame-Retardant PA66 Screws in Energy Storage Battery Modules | FASTKING Case
Case Background
A domestic energy storage integrator was originally using zinc-plated steel screws plus PC insulation washers to fasten LFP 280Ah × 16S1P battery modules in its 100 kWh - 1 MWh C&I storage cabinets. Three issues emerged: 1) high short-circuit risk from steel screws during thermal runaway, 2) insulation washers aging and requiring annual replacement, 3) 12g per screw × 32 screws per module complicating dense stacking.
Solution
FASTKING recommended an integrated pa66+30%GF black flame-retardant V-0 solution: glass fiber for mechanical strength, UL94 V-0 rating for module fire protection, and material's natural electrical insulation eliminating the separate washer. Paired with pa66 hex spacers for PCB support.
Specifications
- Material: PA66 + 30% GF + flame retardant (black, UL94 V-0, LOI ≥ 32)
- Sizes: M4×10 / M5×12 / M6×16 / M8×20 hex socket cap head + flat washers
- Performance: tensile 170 MPa, CTE 30×10⁻⁶/°C, surface resistance 10¹² Ω
- Certifications: UL94 V-0, RoHS, REACH, UN 38.3
Results
Over 15 months, FASTKING delivered 3.8 million PA66 flame-retardant screws across 10+ storage projects:
- Per-screw weight down from 12g to 6.6g (45% reduction), saving 170g per module.
- Insulation washers eliminated, saving 12 seconds per module and 18,000 hours annually.
- Passed UL9540A thermal-runaway test for energy storage systems (no flame spread).
- Enabled customer expansion into European and Australian C&I storage markets; 2.5 GWh installed capacity covered.
Contact FASTKING for energy storage and EV battery plastic fastener (flame-retardant PA66 / peek / PI) selection or sample testing.