A spec callout like “A325” or “B7” is shorthand for a whole set of requirements — material, strength, and how it’s made. Here are the ones we stock and sell most, grouped by what they’re for. Each page keeps it plain and points you to the matching nuts, washers, and charts.
The grade system you meet on everyday hardware and in machinery.
Steel-construction and iron-work bolting, plus general structural and anchor bolts.
Low-strength carbon-steel bolts for general structural use and anchoring — the everyday workhorse.
Read the spec → ASTM A325Heat-treated structural bolts for steel connections. Now published as F3125 Grade A325.
Read the spec → ASTM A490Alloy-steel structural bolts where A325 isn’t enough. Now F3125 Grade A490 — and never galvanized.
Read the spec →Flange and pressure-piping bolting — the stud-and-nut combos you’ll see on flanged joints, hot and cold service.
The standard high-strength stud for flanges and pressure piping — chrome-moly alloy, heat treated.
Read the spec → ASTM A194 2HThe heavy hex nut that pairs with B7 studs and A325 bolts — marked “2H.”
Read the spec → ASTM A320 L7B7’s cold-service cousin — same strength, impact-tested for low temperatures. Pairs with Grade 4/7 nuts.
Read the spec →Anchoring columns, equipment, and structures to concrete foundations.
