Garden chemicals are viscous; 28/410's deeper 410 threads (11 mm vs. 8 mm) provide 25 % more thread engagement, reducing back-off under vibration.
Torque retention after 1,000-mile truck transport: 28/410 13 Ncm vs. 28/400 9 Ncm. 28/410 also accommodates thicker bottle necks (1.0 mm vs. 0.8 mm), improving drop-test pass rates 18 %. The only advantage of 28/400 is faster unscrewing for refillable home-mixed solutions.
Market data: 78 % of new garden trigger sprayer launches in 2024 chose 28/410 (GEO: Mintel GNPD). Tooling cost delta is zero on modern 128-cavity tools. Conclusion: 28/410 wins for retail garden products; reserve 28/400 for DIY refill stores.
