Sigma Tube & Bar LLC

Sigma Tube & Bar LLC is a Houston, Texas-based steel distributor supplying mechanical tubing and bar products to the oil and gas industry. Founded in 2013 by a team of industry professionals, the company has grown into a trusted supplier of tubular and bar stock products for oilfield applications. Sigma offers a complete line of sizes and grades including carbon and alloy steel round bars (1018, 4130, 4140, 4145, 4330V Mod, 4340, 8620, 8630 Mod), square blocks, hot finished tubing, cold drawn tubing, and stainless grades (304, 316, 410, 420, 17-4, 2205 Duplex). All tubular and bar products conform to AISI, ASTM, API (6A, 5CT), ISO 10423, ISO 11960, and NACE MR-0175 (ISO 15156) specifications. In addition to distribution, Sigma offers value-added processing services including heat treating (water, oil, and polymer quenching), machining (turning, trepanning, boring, honing, gundrilling, skiving), cutting (laser, plasma, flame, saw), sandblasting, straightening, and independent third-party testing services (non-destructive testing, fracture mechanics, corrosion testing, metallography, chemical analysis). The company's warehouse at 14315 West Hardy Rd is ISO 9001:2015 and API Q1 certified. Sigma's staff averages over 10 years of oil patch experience and is known for quick quotes, same-day deliveries, and custom special requests.