How do i Clamp the Z position of a rigidbody?

:D

What i have doesnt exactly Clamp =/

here's my code:

if(Input.GetButtonDown("A"))
{
    transform.position.z += 1.7;
    if(transform.position.z == 83.75)
    {
       transform.position.z = 83.75;
    }
}
if(Input.GetButtonDown("D"))
{
    transform.position.z -= 1.7;

    if(transform.position.z == 80.75)
    {
       transform.position.z = 80.75;
    }
}

my suggestion for your script:

if(Input.GetKeyDown("a"))
{
    transform.position.z += 1.7;
    if(transform.position.z >= 83.75)
    {
       transform.position.z = 83.75;
    }
}
if(Input.GetKeyDown("d"))
{
    transform.position.z -= 1.7;

    if(transform.position.z <= 80.75)
    {
       transform.position.z = 80.75;
    }
}