Wall Stud Material Hardness and Thickness: What Buyers Should Confirm

1. What to confirm

Before freezing a drywall C stud quote, state thickness, steel grade / hardness, and zinc coating.

Machine power and punch tooling assume a coil window — out-of-window coil causes springback, lip crack, or punch wear issues. Material must be confirmed in the technical proposal before final motor sizing.

2. Documented bands

Market drywall studs are widely sold at 0.4 / 0.5 / 0.6 mm. G550 (min yield 550 MPa) appears on high-strength LGS strip datasheets — useful when buyers specify high-tensile coil, but ductility is lower; confirm formability with the mill.

Coating mass (e.g. Z100 / Z180 class wording on mill certificates) also belongs on the RFQ. Do not assume the forming mill will “absorb” any coating or hardness the buyer later ships.

3. What not to mix

• Villa frame about 0.7–1.4 mm — different machine and punch system
• Structural C purlin about 1.0–3.0 mm — different machine family
• High-speed field setups are not automatic substitutes for standard English quotation speeds
• Do not paste villa G550 punch load expectations onto a thin drywall C50 package

4. Shop-floor effects

• Harder strip → more springback and punch load
• Thicker strip within a named tier → confirm shear capacity
• Wrong coating / hardness → premature punch wear or lip cracking

These effects are why coil specs lock before main/hydraulic kW on a serious proposal.

5. Inquiry checklist

• Drawing gauge (mm) and tolerance
• Yield/tensile class (MPa) (e.g. 350–550 MPa class) and coating
• Named machine tier (C50/75/100 vs 65C vs villa)
• Punch hole layout if applicable
• Whether high-tensile G550-class coil is required and formability is proven
• Whether the RFQ mixes villa or structural C gauges into a drywall stud package

Lock coil specs before locking main/hydraulic kW. Changing hardness after the motor is sized often forces a re-quote of punch and shear capacity. Incomplete coil RFQs are the most common cause of rework.

6. Buyer FAQ

Is 0.6 mm always enough?

Only if the project and local practice say so. State the drawing gauge on the RFQ.

Does higher MPa always mean better?

Not for forming. Higher yield can raise springback and punch load — match grade to the named machine tier.

Can villa 0.7–1.4 mm coil run on a drywall stud mill?

Do not assume it. Villa thickness and punch systems belong on villa frame equipment — keep parameters separate.