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Nissan Armada 2025-2026 Service and Repair Manual: High Strength Steel (HSS) and Ultra High Strength Steel (UHSS)

Nissan Armada 2025-2026 Service and Repair Manual / Body Exterior, Doors, Roof & Vehicle Security / Body Repair — Repair Information / Precaution / High Strength Steel (HSS) and Ultra High Strength Steel (UHSS)

High strength steel and ultra high strength steel are used for body panels in order to reduce vehicle weight.

Accordingly, precautions in repairing automotive bodies made of high strength steel are described below:

UNDERBODY COMPONENT PARTS

ENGINE COMPARTMENT COMPONENT PARTS

Tensile strength Applicable parts
440 - 590 MPa

  • Radiator core main support assembly

  • Upper radiator core support (Center)

  • Upper rear hoodledge

    (Upper rear hoodledge component part)

  • Hoodledge reinforcement

    (Hoodledge reinforcement component part)

  • Lower side dash assembly

  • Lower dash reinforcement

    (Lower dash complete component part)

  • Lower dash bracket

    (Lower dash complete component part)

Tensile strength Applicable parts
1180 - 1300 MPa

  • Side dash (Upper)

    (Side dash component part)

  • Side dash extension

    (Side dash component part)

  • Side dash (Lower)

    (Side dash component part)

  • Side dash reinforcement (Front)

    (Side dash component part)

  • Side dash reinforcement (Lower)

    (Side dash component part)

Read the following precautions when repairing HSS and UHSS:

FLOOR COMPONENT PARTS

Tensile strength Applicable parts
440 - 590 MPa

  • Inner sill brace

    (Inner sill component part)

  • Front floor assembly

  • 2nd crossmember

    (2nd crossmember member assembly component part)

  • Front seat mounting bracket

    (2nd crossmember member assembly component part)

  • Front floor reinforcement assembly

  • Rear floor front extension

    (Rear floor front extension component part)

  • Rear floor front extension

    (Rear floor front extension component part)

  • Rear floor front

  • Nut plate

    (3rd seat mounting bracket component part)

  • Battery mounting bracket (With ProPILOT Assist 2.1 models only)

    (Trim mounting bracket assembly component part)

Tensile strength Applicable parts
980 - 1180 MPa

  • Inner sill

    (Inner sill component part)

  • Inner sill reinforcement (Front)

    (Inner sill component part)

  • Inner sill reinforcement (Rear)

    (Inner sill component part)

  • Front 2nd seat crossmember reinforcement

    (Rear floor front extension component part)

  • Lower rear seat back support

    (Rear floor front extension component part)

Read the following precautions when repairing HSS and UHSS:

FRONT AND REAR MEMBER COMPONENT PARTS

Tensile strength Applicable parts
440 - 590 MPa

  • Side member outrigger

    (2nd crossmember assembly component part)

  • Front outrigger reinforcement

    (2nd crossmember assembly component part)

  • Outer gusset reinforcement

    (2nd crossmember assembly component part)

  • Front seat mounting rear crossmember

    (Front seat mounting rear crossmember assembly component part)

  • 3rd body mounting bracket

    (Front seat mounting rear crossmember assembly component part)

  • 4th body mounting bracket

    (4th crossmember assembly component part)

  • Inner sill extension

    (Rear seat crossmember assembly component part)

  • 4th body mounting reinforcement

    (Rear seat crossmember assembly component part)

  • 2nd seat mounting striker bracket

    (Rear seat crossmember assembly component part)

  • Seat belt anchor nut plate

    (Rear seat crossmember assembly component part)

  • 3rd seat mounting bracket

    (Rear side member component part)

  • Nut plate (RH only)

    (Rear side member component part)

  • Rear side member

    (3rd rear crossmember assembly component part)

  • Rear seat mounting bracket

    (3rd rear crossmember assembly component part)

  • 3rd seat mounting bracket

    (3rd rear crossmember assembly component part)

  • Center 3rd seat mounting bracket

    (3rd rear crossmember assembly component part)

  • Rear side rear member

    (Rear end crossmember assembly component part)

  • Lower rear end crossmember

    (Rear end crossmember assembly component part)

  • Center rear crossmember reinforcement

    (Rear end crossmember assembly component part)

Tensile strength Applicable parts
980 - 1180 MPa

  • Front side member assembly

  • 3rd crossmember reinforcement

    (Front seat mounting rear crossmember assembly component part)

  • Front seat mounting rear crossmember

    (Front seat mounting rear crossmember assembly component part)

  • 4th crossmember

    (4th crossmember assembly component part)

  • Side step bracket

    (Rear seat crossmember assembly component part)

  • Rear seat crossmember

    (Rear seat crossmember assembly component part)

  • Rear seat crossmember reinforcement

    (Rear seat crossmember assembly component part)

  • Rear side member extension

    (Rear side member component part)

  • Upper rear side member

    (Rear side member component part)

  • Rear side member

    (Rear side member component part)

  • 3rd seat mounting rear crossmember

    (3rd rear crossmember assembly component part)

Read the following precautions when repairing HSS and UHSS:

BODY COMPONENT PARTS

ROOF AND DOORS COMPONENT PARTS

Tensile strength Applicable parts
440 - 590 MPa

  • Front roof rail reinforcement

    (Front roof rail component part)

  • 2nd roof bow (Without sunroof models only)

  • Lower rear roof rail

    (Rear roof rail component part)

  • Front door guard front bracket

    (Front door assembly component part)

  • Front door guard rear bracket

    (Front door assembly component part)

  • Rear door guard front bracket

    (Rear door assembly component part)

  • Rear door guard rear bracket

    (Rear door assembly component part)

Tensile strength Applicable parts
1180 - 1470 MPa

  • Front roof rail

    (Front roof rail component part)

  • Front door guard beam

    (Front door assembly component part)

  • Rear door guard beam

    (Rear door assembly component part)

Read the following precautions when repairing HSS and UHSS:

BODY SIDE COMPONENT PARTS

Tensile strength Applicable parts
440 - 780 MPa

  • Front roof rail brace

    (Upper inner front pillar component part)

  • Inner front pillar bracket

    (Upper inner front pillar component part)

  • Center roof rail brace (Without sunroof models only)

    (Inner side roof rail component part)

  • Rear assist grip bracket

    (Inner center pillar component part)

  • Upper inner center pillar reinforcement

    (Inner center pillar component part)

  • Center pillar hinge brace

    (Lower center pillar brace component part)

  • Lower front pillar bulkhead

    (Front pillar brace component part)

  • Outer front sill reinforcement

    (Front pillar brace component part)

  • Outer sill brace

    (Outer sill reinforcement component part)

  • Inner side panel reinforcement

    (Inner rear pillar reinforcement component part)

  • Inner rear pillar

    (Inner rear pillar component part)

  • Center roof rail brace

    (Inner rear pillar component part)

  • Back pillar seat belt anchor

    (Back pillar reinforcement component part)

Tensile strength Applicable parts
980 - 1300 MPa

  • Upper inner front pillar

    (Upper inner front pillar component part)

  • Lower inner front pillar reinforcement

    (Upper inner front pillar component part)

  • Inner front side roof rail

    (Inner side roof rail component part)

  • Inner center pillar

    (Inner center pillar component part)

  • Inner center pillar reinforcement

    (Inner center pillar component part)

  • Outer side roof rail reinforcement

    (Upper front pillar reinforcement component part)

  • Upper front pillar reinforcement

    (Upper front pillar reinforcement component part)

  • Outer front pillar reinforcement

    (Upper front pillar reinforcement component part)

  • Center pillar hinge brace

    (Lower center pillar brace component part)

  • Upper outer center pillar reinforcement

    (Lower center pillar brace component part)

  • Upper front pillar hinge brace

    (Front pillar brace component part)

  • Upper outer front pillar

    (Front pillar brace component part)

  • Lower front pillar reinforcement

    (Front pillar brace component part)

  • Outer front sill reinforcement

    (Front pillar brace component part)

  • Outer sill reinforcement

    (Outer sill reinforcement component part)

Read the following precautions when repairing HSS and UHSS:

FRAME COMPONENT PARTS

Tensile strength Applicable parts
440 - 780 MPa

  • 2nd crossmember assembly

  • Rear engine mounting crossmember complete

  • Fuel tank crossmember assembly

  • 7th crossmember assembly

  • Rear suspension crossmember

  • Rear suspension crossmember complete

  • Rear end crossmember assembly

  • Front side member closing assembly (Front)

  • 1st cab mounting bracket assembly

  • Front suspension cross reinforcement (Front)

  • Front side member closing assembly (Rear inner side)

  • Front shock absorber mounting bracket

    (Front suspension bracket assembly component part)

  • Nut holder

    (Front suspension bracket assembly component part)

  • Front protector assembly (Rear)

  • Engine mounting bracket assembly

  • Lower front link mounting bracket assembly

  • Stabilizer mounting bracket assembly

  • Front side member assembly

  • Outer center side member

    (Center side member assembly component part)

  • Fuel tank protector assembly

  • Fuel cooler bracket assembly

  • Rear shock absorber bracket assembly

  • Rear spring bracket reinforcement

  • Rear side member assembly

  • Rear end gusset

  • Upper front bumper crossmember bracket

    (Front bumper crossmember assembly component part)

  • Front suspension rear crossmember assembly

  • Front protector assembly (Front)

  • Front side member closing assembly (Rear outer side)

Tensile strength Applicable parts
980 MPa

  • Center side member reinforcement (Outer)

  • Inner center side member reinforcement

    (Center side member assembly component part)

  • Inner center side member

    (Center side member assembly component part)

  • Center side member reinforcement (Inner front side)

  • Center side member reinforcement (Inner rear side)

Read the following precautions when repairing HSS and UHSS:

Following precautions

  1. Additional points to consider

    • The repair of reinforcements (such as side members) by heating is not recommended, because it may weaken the component. When heating is unavoidable, never heat HSS parts above 550°C (1,022°F).

      Verify heating temperature with a thermometer.

      (Crayon-type and other similar type thermometer are appropriate.)

    • When straightening body panels, use caution in pulling any HSS panel. Because HSS is very strong, pulling may cause deformation in adjacent sections of the body. In this case, increase the number of measuring points, and carefully pull the HSS panel.

    • When cutting HSS panels, avoid gas (torch) cutting if possible. Instead, use a saw to avoid weakening surrounding areas due to heat. If gas (torch) cutting is unavoidable, allow a minimum margin of 50 mm (1.97 in).

    • When welding HSS panels, use spot welding whenever possible in order to minimize weakening surrounding areas due to heat.

      If spot welding is impossible, use MIG. welding. Do not use gas (torch) for welding because it is inferior in welding strength.

    • Spot welding on HSS panels is harder than that of an ordinary steel panel.

      Therefore, when cutting spot welds on a HSS panel, use a low speed high torque drill (1,000 to 1,200 rpm) to increase drill bit durability and facilitate the operation.

  2. Precautions in spot welding HSS

    This work should be performed under standard working conditions. Always note the following when spot welding HSS:

    • The electrode tip diameter must be sized properly according to the metal thickness.

    • The panel surfaces must fit flush to each other, leaving no gaps.

    • Follow the specifications for the proper welding pitch.

      Unit: mm (in)

      Thickness (T) Minimum pitch (L)

      0.6 (0.024)

      0.8 (0.031)

      1.0 (0.039)

      1.2 (0.047)

      1.6 (0.063)

      1.8 (0.071)

      10 (0.39) or more

      12 (0.47) or more

      18 (0.71) or more

      20 (0.79) or more

      27 (1.06) or more

      31 (1.22) or more
Repairing High Strength Steel
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Preparation
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Other materials:

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