Bolts M20 x 250mm lg Full threaded , complete with with Nut and one washer Grade 8.8 32 pcs. (for strand jack) Bolts M20 x 450mm lg Full threaded , complete with with Nut and one washer Grade 8.8 32 pcs. (for anchor block) Min Tensile strength of G8.8 bolt is 800 MPa ( or 800 N/mm2).