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MF FASTENER INDUSTRIES LLC
Emirates Modern Industrial Area, Umm Al Quwain, U.A.E. · P.O. Box 7071 · ISO 9001:2015 · Technical Library
TECHNICAL LIBRARY

Know your grade

Which bolt do I need? · five questions · a free check by an MF engineer

You don't need to know the grade. Tell us what it's for and where it is, and we'll tell you exactly what to ask for. If you're not sure about a question, choose Don't know — we'll assume the safe answer and say so.

1 of 5 · What is it for?
What is the bolt for?
Pick the closest. It doesn't have to be exact.
Where will it be?
This decides whether it needs galvanizing, stainless, or nothing.
How hot or cold does it get?
Normal weather covers almost everything, including sun-heated steel.
Does anything shake, move, or carry a lot of weight?
If an engineer's drawing already says a grade, tell us here.
Anything else we should know?
Pick all that apply, or skip.
Ask for this
Why
    Send this to MF — free check
    This is our suggestion from what you told us, based on the published standards. If there is an engineer's drawing or a project specification, that comes first — send it with your enquiry and we'll check the grade on it before you order.
    Choose one to continue

    Why we ask, and not just sell

    Wrong grade, wrong answer"High tensile" is not a grade. A bolt too strong for a concrete foundation makes the concrete fail first; a bolt too weak strips its nut. We ask so the answer is right.
    The coast changes everythingMost Gulf sites are ISO 12944-2 category C5 — high salt, high humidity, condensation every morning. Plain zinc plating does not survive it. Galvanizing or stainless does. Offshore is a step beyond.
    The set matters, not the boltA galvanized bolt needs a nut tapped oversize or it won't go on. A strong bolt needs a strong nut. A preloaded joint needs a hardened washer. We give you the whole set.

    Want the reasoning?

    Every grade, coating and rule this page uses is explained in the Bolt Lab — head markings, galvanizing, coating life on the coast, anchor bolt failure modes, and how to read the certificate that comes with the bolts.