4140 alloy steel is a chromium molybdenum manganese alloy steel with good hardness penetration. 4140 has high fatigue strength, abrasion and impact resistance, toughness and torsional strength. This material was designed with consistent hardness and high strength.

4140 has good machinability in the annealed condition. It can also be welded using conventional techniques. Keep in mind that the mechanical properties of 4140 will be affected if its welded in the heat treated condition. So if you are going to weld it, heat treat it after welding.

Specifications:

AISI 4140, UNS G41400, AMS 6382, AMS-S-5626, AMS 6349, ASTM A193 (B7, B7M), AMS 6381, ASTM A194, ASTM A513, ASTM A829, AMS 6382, ASTM A29, SAE J1397, AMS 6390, ASTM A320, ASTM A519, SAE J404, AMS 6395, ASTM A322, ASTM A646, SA J412, AMS 6529, ASTM A331, ASTM A711

Applications:

Shafts, crankshaft, bolts, machinery parts, gears, milling spindle, nuts, slide, steel collet, steel conveyor and roll, steel coupling, drill collar, steel ejector, steel piston rod, steel stub, tool holders, couplings, guides, ejector pins, pump shafts, brake dies, spindles, sockets, motor shafts, forks, tracks, hydraulic machinery shafts, axles, tie rods, connecting rods, reamer bodies, chain links and sprockets.