Which of the following is NOT a listed location for High Strength-Low Alloy steel on a vehicle?

• A. Pillars
• B. Side Members
• C. Upper and Lower Rails
• D. Rocker Panel

Answer: (D)

High Strength-Low Alloy steels are used in parts of the vehicle that form the main load paths in a crash, giving both strength and lighter weight. You’ll typically find HSLA in pillars (the A-pillar and other side pillars), side members (the frame-like elements along the sides), and the upper and lower rails (the structural members that run along the top and bottom of the frame or body). These locations are chosen because they need to resist deformation under impact while keeping the vehicle’s weight down.

The rocker panel, while part of the side structure, is generally not listed as an HSLA location because it’s treated more as a body-side panel and may use different steel grades. It isn’t considered a primary HSLA load-path member in many standard listings, which is why it’s the one that’s not listed.