Peterbilt 587 Dome Light Bulb Size

Additional Notes

• The 211-2 is the sole dome light bulb type listed for the Peterbilt 587, applied uniformly across the 2011-2018 model years.
• The 211-2 is classified as a festoon bulb, a cylindrical form factor held in place by contact pressure at each end rather than by a socket with a locking mechanism.
• The 211-2 carries ANSI standardization, meaning its physical and electrical characteristics conform to a recognized North American specification valid in both the United States and Canada.
• The bulb operates at 12 volts and consumes 12 watts, figures consistent with standard automotive low-voltage electrical systems.
• The 211-2 uses an SV8.5 base, which denotes a festoon-style contact base with an 8.5mm cap width at each end.
• The bulb body measures 41mm in length, a figure relevant to fitment within the dome light housing, as festoon bulbs must physically span the contact points of the fixture.
• The 211-2 designation is an industry-standard bulb number, meaning equivalent bulbs sold under different brand names but sharing the same ANSI designation are generally interchangeable in terms of physical fit and electrical load.
• Substituting a festoon bulb of a different length, such as a 39mm or 44mm unit, would result in poor contact or no contact within the fixture, even if the voltage and wattage ratings match.