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08 · Structural steel · class & coating

Structural bolt class & coating: match the controlling revision

A structural bolt enquiry is tied to the drawing revision that names class and coating — not a commercial hex shelf SKU and not a screws→bolts→nuts warehouse list. Lock class, coating, length, and the nut/washer set against that revision before any unit price is useful.

Define · what this RFQ is for

Use this guide when the print calls a structural bolt class (for example 8.8 or 10.9, or a project-specific callout) and a coating note on steel connections, curtain-wall steel frames, or heavy brackets. You own design loads and the inspection plan; we confirm class, coating, diameter × length, and whether the BOM is a full assembly against the controlling revision.

Pair with drawing handoff (revision first) and load-path primer, then open Enquire / RFQ. Do not mix this desk with stone undercut (G4) or chemical-anchor (G6) language in the same quote thread unless the print clearly mixes nodes.

Discuss · fields that change the quote

Each row below is a desk check. Missing rows stay Open — we do not invent certificates, plant metrics, or ranking badges on this site.

Field desk · 01–06

Copy into RFQ notes
  1. Strength class 8.8 vs 10.9 (or the exact project callout) changes the steel package. Write the class from the controlling revision — not a catalog default.
    • Email example: Class: 10.9 per Rev E connection schedule CS-12
    • If missing: Open — no final price
  2. Coating / finish HDG, electro-zinc, a named thin-film system, stainless, or bare — must match the print note for the environment. Do not upgrade or downgrade coating to “help” the quote.
    • Email example: Coating: HDG per Rev E; no substitute without written note
    • If missing: buyer note or Open
  3. Diameter × length Grip = plate stack + washers. Length must come from the print or a marked stack-up, not from a shelf chart alone.
    • Email example: M20 × 90 (grip 2×16 mm plate + 2 washers); confirm on RFQ
    • If missing: ask for stack
  4. Nut / washer set Full assembly (bolt + nut + washers) vs bolt-only. Hardened washers or structural nuts must be called on the BOM when required.
    • Email example: Full set: bolt + nut + 2× hardened washers per CS-12
  5. Controlling revision Class and coating often change between revisions. The RFQ thread names the revision that rules — see drawing handoff.
    • Email example: Controlling: Rev E issued 2026-09-12; superseded Rev D class notes ignored
  6. Qty band & use Discussion band is enough for the first reply: mock-up connection, one frame set, or project lot.
    • Email example: Qty band: mock-up 40 sets → project lot TBD

Structural callout vs commercial hex

  • Structural class language — class + coating + revision on the connection schedule.
  • Commercial hex shelf language — avoid on this desk; it reads like a warehouse twin and does not lock revision.
  • If the print only says “M16 hex” with no class, state Open and ask for the connection schedule before numbering.

Agree · before we number

Until the following are aligned, treat any figure as discussion only:

  • Controlling revision locked on the connection detail
  • Class (01) and coating (02) match that revision — no silent substitutes
  • Lot marking / mill test documents only after class + coating + length align; we do not invent ISO/CE/IATF badges on this public page
  • Samples, packing, and private-label marking only after the nut/washer set (04) is clear

Project documents that matter to the RFQ are shared privately when relevant.

Next step

Skim RFQ checklist · drawing handoff · load-path primer, then open Enquire / RFQ. Direct email: shizhanhao6@gmail.com.

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