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#7440 Miniature Bulb Glass Wedge Base, T-6 1/2 Wedge 12V 21W, 7440, #7440, #7440 Bulb, #7440 Lamp, #7440 Miniature, #7440 Miniature Lamp, #7440 Indicator, Eiko# 40931#7440 Mini Bulb,#7440 Mini Lamp,#7440 Automotive Bulb,CEC#7440 W21W Miniature Bulb Glass Wedge Base, #W21W Bulb, W21W Lamp, W21W Miniature, #W21W Miniature Lamp, #W21W Indicator,#W21W Automotive Bulb,#W21W Automotive Lamp,#W21W Mini Bulb,#W21W Mini Lamp,CEC #W21W #7443 Miniature Bulb Glass Wedge Base,T-6 1/2 Wedge 12V 35/3W, 7443,#7443, #7443 Bulb, #7443 Lamp, #7443 Miniature, #7443 Miniature Lamp, #7443 Indicator, EIKO #40935,W21/5,#7443 Mini Bulb,#7443 Mini Lamp,#7443 Automotive Bulb,CEC#7443
#7440 Miniature Bulb Glass Wedge Base - 13.5 Volt 1.7 Amp 21 Watt T6-1/2 Glass Wedge (W3X16d) Base, 300 Hour W21W Miniature Bulb Glass Wedge Base - 13.5 Volt 1.7 Amp 21 Watt T6-1/2 Glass Wedge (W3X16d) Base, 300 Hour #7443 Miniature Bulb Glass Wedge Base - 13.5 Volt 1.85/0.44 Amp T-6 1/2 Glass Wedge (W3X16q) Base,  500/1,000 Hour
W21/5W Miniature Bulb Glass Wedge Base, #W21/5W Bulb, W21/5W Lamp, W21/5W Miniature, #W21/5W Miniature Lamp, #W21/5W Indicator,#W21/5W Automotive Bulb,#W21/5W Automotive Lamp,#W21/5W Auto Bulb, W21/5W Motorcycle Bulb #7441 Miniature Bulb Glass Wedge Base,T-6 1/2 Wedge 12.8V 27W,7441,#7441,#7441 Miniature, #7441 Bulb, #7441 Lamp,W27W, #7441 Automotive Bulb, #7441 Miniature Automotive Light Bulb,#7441 Mini Bulb,#7441 Min Lamp,#7441 Automotive Lamp,CEC#7441 #7440NA  Miniature Bulb Glass Wedge Base , T-6 1/2 Wedge 1/2 12V 21W, Natural Amber, 7440NA, #7440NA, #7440NA Bulb, #7440NA Lamp, #7440NA Miniature, #7440NA Miniature Lamp, #7440NA Automotive Bulb, EIKO# 00178, #7440NA Miniature Indicator Bulb
W21/5W Miniature Bulb Glass Wedge Base - 13.5 Volt 1.85/0.44 Amp T-6 1/2 Glass Wedge (W3X16q) Base,  500/1,000 Hour #7441 Miniature Bulb Glass Wedge Base - 12.8 Volt 2.10 Amp 27 Watt T-6 1/2 Glass Wedge Base,  1,200 Hour #7440NA  Miniature Bulb Glass Wedge Base - 13.5 Volt 1.70 Amp 21.0 Watt T-6 1/2 Natural Amber Glass Wedge (WX16d) Base, 300 Hour
WY21W Miniature Bulb Glass Wedge Base, #WY21W Bulb, WY21W Lamp, WY21W Miniature, #WY21W Miniature Lamp, #WY21W Indicator,#WY21W Automotive Bulb,#WY21W Automotive Lamp,#WY21W Auto Bulb, WY21W Motorcycle Bulb #7443NA Miniature Bulb Glass Wedge Base, Natural Amber T-6 1/2 Wedge  12V 21/5W, 7443NA,#7443NA, #7443NA Bulb, #7443NA Lamp, #7443NA Miniature, #7443NA Miniature Lamp, #7443NA,WY21/5W,#7443NA Automotive Bulb,#7443NA Automotive Lamp,CEC#7443NA WY21/5W Miniature Bulb Glass Wedge Base, #WY21/5W Bulb, WY21/5W Lamp, WY21/5W Miniature, #WY21/5W Miniature Lamp, #WY21/5W Indicator,#WY21/5W Automotive Bulb,#WY21/5W Automotive Lamp,#WY21/5W Auto Bulb, WY21/5W Motorcycle Bulb,ECE# WY21/5W
WY21W Miniature Bulb Glass Wedge Base - 13.5 Volt 1.70 Amp 21.0 Watt T-6 1/2 Natural Amber Glass Wedge (WX16d) Base, 300 Hour #7443NA Miniature Bulb Glass Wedge Base - 13.5 Volt 1.75/0.40 Amp T-6 1/2 Natural Amber Glass Wedge (W3X16q) Base 500/1,000 Hour
WY21/5W Miniature Bulb Glass Wedge Base - 13.5 Volt 1.75/0.40 Amp T-6 1/2 Natural Amber Glass Wedge (W3X16q) Base 500/1,000 Hour
#7440NALL Miniature Bulb Glass Wedge Base,T-6 1/2 Wedge 1/2 12V 21W, Natural Amber Long Life,7440NALL, #7440NALL, #7440NALL Bulb, #7440NALL Lamp, #7440NALL Miniature, #7440NALL Miniature Lamp, #7440NALL Indicator, #7440NALL Automotive Bulb WY21W Long Life Miniature Bulb Glass Wedge Base, #WY21W Long Life Bulb, WY21W Long Life Lamp, WY21W Long Life Miniature, #WY21W Long Life Miniature Lamp, #WY21W Long Life Indicator,#WY21W Long Life Automotive Bulb,#WY21W Long Life Automotive Lamp #7443NALL Natural Amber Long Life Miniature Bulb,T6 1/2 12V 21/5W, 7443NALL,#7443NALL, #7443NALL Bulb, #7443NALL Lamp, #7443NALL Miniature, #7443NALL Miniature Lamp, #7443NALL Automotive Bulb,#7443NALL Mini Bulb,#7443NALL Mini Lamp,CEC#7443NALL
#7440NALL Miniature Bulb Glass Wedge Base - 13.5 Volt 1.85 Amp 21 Watt Long Life T-6 1/2 Natural Amber Glass Wedge (WX16d) Base, 600 Hour WY21W Long Life Miniature Bulb Glass Wedge Base - 13.5 Volt 1.85 Amp 21 Watt Long Life T-6 1/2 Natural Amber Glass Wedge (WX16d) Base, 600 Hour #7443NALL Natural Amber Long Life Miniature Bulb - 12.0 Volt 1.75/0.42 Amp 21/5 Watt Long Life T-6 Natural Amber Glass Wedge (W3X16q) Base, 1,000/2,000 Hour
WY21/5W Long Life Miniature Bulb Glass Wedge Base, #WY21/5W Long Life Bulb, WY21/5W Long Life Lamp, #WY21/5W Long Life Miniature Lamp, #WY21/5W Long Life Indicator,#WY21/5W Long Life Automotive Bulb,ECE #WY21/5W Long Life Auto Bulb, CEC WY21/5W Long Life HIB7440WM White Max 2 Piece Blister Pack, HIB7440 WM, T-6 1/2 Wedge W3X16d 12V 21W (W21W) WhiteMax, CEC #HIB7440, WhiteMax #7440 HIB7443WM White Max 2 Piece Blister Pack, HIB7443 WM, T-6 1/2 Wedge W3X16q 12V 21/5W (W21/5W) WhiteMax, CEC #HIB7443, WhiteMax #7443
WY21/5W Long Life Miniature Bulb Glass Wedge Base - 12.0 Volt 1.75/0.42 Amp 21/5 Watt Long Life T-6 Natural Amber Glass Wedge (W3X16q) Base, 1,000/2,000 Hour HIB7440WM White Max 2 Piece Blister Pack - 13.5 Volt 1.85 Amp 25 Watt T6-1/2 Glass Wedge, 300 Hour HIB7443WM White Max 2 Piece Blister Pack - 13.5/13.5 Volt 1.85/0.445 Amp 25/6 Watt T6-1/2 Glass Wedge, 500/1000 Hour
   
 
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T-6 1/2 Glass Wedge Base bulbs are designated by the letter T. The T designates that the bulb is tubular in shape. The number(s) following the T indicates the width of the glass envelope (not the base) in eighths of an inch. T-6 1/2 Glass Wedge Base bulbs are six and one half eighths of an inch or 0.8125" or 20.6375 millimeters in diameter.