3/8 in Outside Dia, -0.003 in, 4140 Alloy Steel Rod - 786TZ8|40r.375-24 - Grainger
MetalsDepot® - 4140 Alloy Steel Round Bar
Hot Rolled AISI 4140 4130 Low Carbon Alloy Steel Solid Round Rod Steel Bars with Competitive Price - China Round Steel Bar, AISI 4140 Steel Bar | Made-in-China.com
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