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BS A 104:2025 AEROSPACE SERIES Bolts, hexagonal heads with optional safety locking wire holes, unified threads, corrosion-resisting or heat-resisting steels, plain finish. Specification. Classification CR steel Rm ≥ 127 600 lbf/in2 (880 MPa) at Ambient temperature | +515 °C. Classification HR steel Rm ≥ 130 500 lbf/in2 (900 MPa) at Ambient temperature | +515 °C

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