Select the form around the part you need to make
Start with the geometry and process. A round section generally suits turned and cylindrical components; a hexagonal section is useful when wrench flats or a six-sided profile are needed; and a square section can simplify machining or fabrication of blocks, brackets, guides, and supports.
Choosing the nearest useful profile can reduce material removal and set-up work. The final choice should account for the part drawing, machining allowance, tolerance, surface condition, and the grade needed by the application.
- Round bar: shafts, pins, rollers, bushings, spacers, and machine components
- Hexagonal bar: nuts, couplings, fittings, fasteners, and keyed components
- Square bar: brackets, jigs, fixtures, guides, key stock, and support blocks
Treat grade names and equivalents as a verification step
Commercial equivalents can help buyers find a starting point, but they are not a substitute for checking the governing standard, chemistry, mechanical properties, and delivery condition required by the job. This is especially important where strength, machinability, weldability, heat treatment, or traceability affect the finished component.
If a project calls for S45C, AISI 1045, SGD290D, SGD400D, S20C, or another grade, share the drawing or specification with the enquiry. Confirm the offered material against the MTC and your approved technical requirement before processing it.
A useful product request includes more than the item name
A clear request protects both the buyer and supplier from avoidable assumptions. It makes the intended material, order size, and delivery context visible early enough to check the right route.
- Grade or standard, plus approved alternates if any
- Shape and nominal size, including machining allowance when relevant
- Quantity, length requirement, and packaging needs
- MTC or other documentation requirement
- Delivery city, requested date, and purchase-order conditions
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Frequently asked questions
Which steel-bar shape is best for a shaft?+
A round bar is generally the natural starting point for a shaft. Confirm the grade, straightness, machining allowance, tolerance, and heat-treatment requirement against the component drawing.
Can I request a size outside the listed range?+
Yes. Share the grade, shape, section size, quantity, and required date. Availability, lead time, and commercial terms must be confirmed for the specific request.
How should I compare an offered equivalent grade?+
Compare the applicable standard and the properties required by the application, then verify the delivered batch using the relevant MTC or approved documentation. Do not rely on a grade name alone.
Start with the specification that matters
Send the grade, shape, diameter or section size, quantity, and delivery location via WhatsApp. CV Tanamas can help you check the relevant supply path before you issue a purchase order.