BS 5A 228:2019标准规定了双六角头螺栓的尺寸范围，包括螺栓的直径、螺距、螺纹长度、螺栓长度等。该标准还规定了螺栓的材料，要求采用合金钢制造，以保证螺栓的强度和耐腐蚀性能。此外，该标准还规定了螺栓的机械性能，包括拉伸强度、屈服强度、延伸率等指标，以确保螺栓在使用过程中的可靠性和安全性。

BS 5A 228:2019标准还规定了螺栓的表面处理要求，要求采用镀镉处理，以提高螺栓的耐腐蚀性能。此外，该标准还规定了螺栓可选的锁线孔要求，以便在需要时使用锁线来固定螺栓。

该标准适用于在常温下Rm≥1241 MPa（180 000 lbf/in2）| +190°C的应用场景，例如航空航天、汽车、机械等领域。在这些领域，螺栓的强度和可靠性要求非常高，因此需要采用符合该标准要求的螺栓。

相关标准
- BS 3692:2001 Specification for ISO metric precision hexagon bolts, screws and nuts — Part 1: Bolts, screws and nuts — Product grades A, B and C
- BS EN ISO 898-1:2013 Mechanical properties of fasteners made of carbon steel and alloy steel — Part 1: Bolts, screws and studs with specified property classes — Coarse thread and fine pitch thread
- BS EN ISO 3506-1:2020 Mechanical properties of corrosion-resistant stainless steel fasteners — Part 1: Bolts, screws and studs with specified grades and property classes — Coarse thread and fine pitch thread
- BS EN 1665:2017 Aerospace series — Bolts, double hexagon head, close tolerance shank, medium length thread, in titanium alloy, anodized, metric MJ threads, classification: 1 100 MPa (at ambient temperature) / 315 °C
- BS EN 1666:2017 Aerospace series — Bolts, double hexagon head, close tolerance shank, medium length thread, in titanium alloy, anodized, metric MJ threads, classification: 1 100 MPa (at ambient temperature) / 315 °C