BS 449 Bolt Loading Capacities — Grade 12.9

Documents

Shipments are backed by Mill Test Certificate (MTC), Dimensional Report, Salt Spray Test Report on request, with full batch traceability from raw material to finished product. Quality management follows the owner-confirmed compliance list: ISO 9001:2015, RoHS, REACH. Exact document sets are confirmed on the order.

Quotation

• The fastener family (BS 449 Bolt Loading Capacities — Grade 12.9) plus the standard designation from your drawing — DIN / ISO / JIS / ASTM / ANSI, or a drawing for custom parts.
• Size (diameter and length), thread type (metric or inch), property class or grade, and coating or finish.
• Quantity per size and your target delivery date.
• Destination country, and any required documents (for example a mill test certificate) so the quote includes them.

Sample & supply

Minimum order quantity is 1,000–10,000 pieces depending on size. Stock items run 3–7 days. High-strength and custom parts run 15–25 days. Quantities or variants outside the standard range are confirmed at quotation.

Storage & shipping

Parts are packed for export and shipped factory-direct to buyers in Europe, Asia, the Americas and the Middle East. Store fasteners dry and protected until installation, and keep coated parts in their packaging until use; specific packing and preservation requirements can be stated on the order and confirmed at quotation.

How do I read the grade 12.9 loading-capacity table for a real joint?

Pick the row for the bolt diameter, then read three numbers. Tension: use the Threads kN column if the shear plane or the grip puts threads in the stressed section, the higher Shank kN value only where the full-diameter shank carries the load. Shear: Single kN for one shear plane, Double kN for two — the double value is exactly twice the single at the same stress. Bearing: take the ply thickness actually passed through (the thinnest ply, if several) and read kN across the 5–25 mm columns; the grid already assumes end distance of at least 2d and a ply bearing strength of 250 N/mm 2. The connection's allowable load is the smallest of the three — tension, shear or bearing — and combined tension-plus-shear needs an interaction check against the governing code, which this table alone does not cover.

Why are there five separate BS 449 capacity pages instead of one table?

Because the grade is the load-bearing assumption: each page tabulates the same 29 diameters but at that grade's own stress values — tension from 120 N/mm 2 at grade 4.6 up to 420 N/mm 2 at grade 12.9, shear and bolt bearing strength rising with it, while the ply bearing strength stays 250 N/mm 2 across all five. Reading a grade 8.8 joint from the grade 4.6 page would understate capacity by more than half; the reverse would overstate it. Choose the page matching the property grade marked on the bolts you order (ISO 898-1 classes use the same numbering), then quote lengths, heads and finish per RFQ — this table series carries capacities only, no dimensions.