How to Specify Titanium Hex and Flat Bar
A complete titanium hex or flat bar RFQ must identify grade, material standard, stock shape, controlling dimensions, tolerance, condition, surface, length, inspection and traceability. A material designation alone does not define the geometry needed for machining.
Dimensions That Control the Quotation
| Stock form | Required dimensions | Additional controls |
|---|---|---|
| Hex bar | Across flats and length | Corner condition, twist, straightness and end cut |
| Flat bar | Thickness, width and length | Edge condition, flatness, camber and end cut |
State whether dimensions are nominal stock sizes or finished-component requirements. Add machining and cut allowance where necessary; do not assume the mill tolerance will satisfy a tight finished-part drawing.
Grade, Standard and Condition
Provide the titanium grade and UNS designation, ASTM B348/B348M revision or approved project specification, condition and required heat treatment. Grade 2 and Grade 5 are not interchangeable solely on strength: service environment, corrosion, design allowables, fabrication and qualification govern selection.
Surface, Inspection and Documents
Define peeled, ground, machined or other agreed surface; dimensional inspection; straightness or flatness; surface examination; mechanical testing; MTC; heat number traceability; and any third-party inspection. Tighter requirements should be written on the purchase drawing.
Select the Stock Form
Review Grade 2 Hex Bar, Grade 5 Hex Bar, Grade 2 Flat Bar, Grade 5 Flat Bar and the Titanium Bar & Rod family.
RFQ Checklist
- Grade, UNS, standard/revision and condition
- Shape and controlling dimensions with tolerances
- Length, end cut, straightness/flatness and allowance
- Surface, inspection, certificates and traceability
- Quantity, application, destination and packaging
FAQ
Is hex bar measured across corners?
Normally the commercial size is stated across flats, but the purchase order or drawing must make the controlling dimension explicit.
Can flat bar thickness and width use the same tolerance?
Not automatically. Specify each dimension and its applicable tolerance separately.
Related Reading
Titanium Bar Purchasing Matrix · Hex vs Round vs Flat Bar · Grade 2 vs Grade 5 Bar