ASTM A276 Type 309 is a material grade specification for cold-finished or hot-finished bars in 309 stainless steel, available in form of rounds, square, hexagons and other hot rolled extruded shapes. Boltport uses 309 bar stock to ASTM A276 specifications for manufacturing stainless steel 309 bolts, nuts, screws, studs, threaded rods, other fasteners and bar stock components for general engineering purposes.