Alloy 20 Screws

Alloy 20 Screws — Specifications & Dimensions

Alloy 20 screws are externally threaded fasteners typically driven into a tapped hole. TorqBolt manufactures Alloy 20 screws per ASME B18.3 (socket products), ASME B18.6.3 (machine screws), DIN 912 / 7991 / 6912, and ISO 4762 / 10642, in metric M3–M48 and imperial 0–1/2".

Drive Types

Head Styles

Alloy 20 screws are available in cap, button, countersunk / flat (82° or 90°), pan, fillister, truss, and shoulder configurations.

Specialty Screws

TorqBolt produces Alloy 20 set screws (cup-point, cone-point, dog-point, flat-point, hex-socket DIN 913/914/915/916), shoulder screws, and self-tapping screws. Each lot certified per EN 10204 3.1 / 3.2 with optional NACE MR0175 sour-service compliance.

High-Mo Super-Austenitic Stainless (254 SMO, 904L, Alloy 20)

Super-austenitic stainless steels are high-Mo (≥6%), high-N austenitic alloys with chloride-pitting resistance approaching duplex grades while retaining austenitic formability.

254 SMO (S31254) is the benchmark with PREN ~43. 904L (N08904) is the original 4.5% Mo super-austenitic for sulfuric-acid plants. Alloy 20 (N08020) is Cu-bearing for hot sulfuric acid. AL-6XN (N08367) extends pitting resistance with 6.5%+ Mo.

Super-austenitic fasteners ship per ASTM A276 / A479 with ASTM G48 Method A pitting testing. Welding requires Ni-base filler (alloy 625 / C-276) to avoid Mo segregation.

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