Overview
For most high-tensile fasteners the wire needs both a spheroidized structure and a phosphated, drawn surface. Indisteel supplies this complete route from one plant: rod is pickled, spheroidize annealed in a nitrogen-atmosphere bell furnace, pickled again, zinc phosphated, and drawn to the finished size — then inspected and tagged as a finished coil.
Doing every step in-house means one heat number, one lot number and one test certificate cover the whole history of the coil, and the drawing reduction after annealing can be set to give the hardness window your header and heat-treatment cycle need.
Applications
- Property class 8.8, 10.9 and 12.9 bolts and screws
- Socket-head cap screws and set screws
- Wheel bolts, engine and chassis fasteners
- Multi-station cold-forged automotive parts
- Heavy cold-formed engineering components
Frequently Asked
What hardness can I expect on SAP + PPD wire?
As-drawn hardness depends on grade and drawing reduction after annealing. We agree the hardness range with you at order stage and report the actual value on the test certificate for every lot.
Can you match a competitor's or overseas specification?
Yes. Share the specification or a sample test certificate and we will confirm the grade, structure and surface we can supply against it.