To order bright bar or HB wire without delays or rejections, your purchase order needs seven lines: grade, size and section, tolerance class, length or coil weight, surface condition, test certificate, and packing and delivery terms. Most disputes between buyers and mills trace back to one of these being left out.

This checklist covers what to write for each, what to check when the material arrives, and the warning signs in a quote.

The seven lines your purchase order needs

1. Grade. Name the grade and its standard: EN 8 to BS 970, 40C8 to IS 1570, SAE 1008 for wire. "MS bar" or "equivalent" without a chemistry leaves too much open. Our guide to EN 8 explains the most common bar grade.

2. Size and section. The nominal diameter in millimetres, and the section: round, hex or square confirm sections. For wire, the diameter and its tolerance.

3. Tolerance class. For bright bar, write h9, h10 or h11. Without it, you get the mill's default, which may not match your drawing. Our tolerance guide has the full table.

4. Length or coil weight. For bar, random lengths or cut to a stated length, with the length tolerance. For wire, the coil weight and inner diameter your line can take.

5. Surface condition. Bright drawn, ground or polished, and whether you want the material oiled for storage.

6. Test certificate. Ask for a mill test certificate showing chemistry and mechanical properties, carrying the heat number, as a condition of dispatch, not a request afterwards.

7. Packing and delivery. Bundle weight, marking, protection from moisture, delivery date and point of delivery.

What to check when the material arrives

• Diameter, measured with a micrometer at several points along a sample of bars or coils, not just one end.

• Straightness of bars, rolled on a flat surface or checked against a straight edge.

• Surface: no scale, pits, seams or rust.

• Heat number on the bundle tag matches the test certificate.

• Quantity and weight against the delivery challan.

Record what you measured. If something is wrong, a measured reading is a conversation. An impression is an argument.

Red flags in a quote

• No grade stated, or "equivalent" with no chemistry attached.

• No tolerance class mentioned for bright bar.

• Test certificate offered "on request" rather than as standard.

• No clarity on whether the supplier manufactures the material or trades it. Both are legitimate, but you should know which.

• A price far below the market with no explanation.

Frequently asked questions

• What is a mill test certificate?

  A document from the manufacturer showing the chemical composition and mechanical properties of the heat of steel your material came from, identified by a heat number.

  
  

• Should I order random or cut lengths?

  Cut lengths cost a little more but save cutting time and scrap on your floor. Random lengths suit stockists and shops cutting many different part lengths.

  
  

• How do I store bright bar and HB wire?

  Dry, covered and off the floor. Neither has a protective coating, so both will rust in damp conditions.

  
  

• Send us your PO draft

  SS Engineering Works has made bright bars and HB wire in Sonipat since 1968. Send your purchase order draft on WhatsApp at +91 70653 37337, and we will check it before you send it. No obligation.