ASTM A453 Grade 668 Stud Bolts Nuts & Fasteners are “In Stock”
ASTM A453 Grade 668 Stud Bolts Nuts & Fasteners are manufactured by Lightning Bolt. A453 grade 668 fasteners can be made into hex bolts, socket head cap screws, and double ended studs. Their properties are certified mechanically and chemically by their corresponding MTRs. Considered specialty alloy, A453 Grade 668 fasteners possess intrinsic properties that make applicable for use in unique engineered conditions. Available 24/7/365, call us 225-272-6200
ASTM A453 668, is the standard specification for high-temperature bolting, with expansion coefficients comparable to austenitic stainless steels. This specification is pretty diverse as it covers mechanical and chemical requirements of 5 grades of bolting with 12 classes of yield strength ranging from 50 – 120 ksi for the use in high temperature service such as pressure vessels and valve flanges in both inch and metric products. Considered as a UNS 66285 material, grade 668 has both unique chemical and mechanical requirements, and may have a minimum tensile strength of 130ksi, and a maximum hardness of 37 HRC.
Per ASTM A453, grade 668 bolts shall be marked with the grade symbol “668 and its corresponding class“ and also a manufacturer mark, of which Lightning Bolt’s mark is “LBS”.
ASTM A453 material requires special processing and is not intended for general purpose applications. In addition, for design temperatures above 800 °F [427 °C], material not stress-rupture tested shall be permanently stamped “NR”. Grade 660 Class D and Grade 668 do not require stress-rupture and shall be stamped NR.
Common manufacturing stages include heat treatment, threading, cutting, chamfering, stamping, and possibly PTFE coating or plating. Lightning Bolt commonly manufacturers ASTM A453 grade 668 fasteners such as: 668 stud bolts, 668 double ended studs, 668 hex bolts, 668 hex cap screws, and 668 socket head cap screws. These products are usually intended for use in assembling pressure vessels, valves, flanges, and fittings. Our mature ISO 9001:2015 quality management system offers our customers outstanding traceability and access to material test reports.
Grade 668 has 4 different classes that are categorized alphabetically, Class A, Class B, Class C, & Class D. Although chemically identical, each class has different solution treatment and hardening treatments, which yield different mechanical properties.
Available 24/7, our customer service is second to none. Contact Lightning Bolt at 225-272-6200 for any and all of your ASTM A453 grade 668 fasteners needs.
