Forged Steel - Quenched & Tempered. Working Load Limits shown are for in-line pull. For angle loading, see page 200 in the Crosby catalog. Fatigue rated at 1-1/2 times the Working Load Limit at 20,000 cycles. Recommended for in-line pull. M-279 metric threaded. Meets or exceeds all requirements of ASME B30.26 including identification, ductility, design factor, proof load and temperature requirements. Importantly, these bolts meet other critical performance requirements including fatigue life, impact properties and material traceability, not addressed by ASME B30.26.