Extrusion Profiles Page 1 of 3 Back to search results 81640 This part is in stock Inventory Snapshot: 406.5 feet* *Material in stock maybe allocated to other orders and is subject to prior sales Surface Area Part Thermal Resistance Width Height Weight Part 2 Number C/W at 3in length* in in lb/ft in /in Class 81640 0.58 12.00 1.81 120.3 14.10 C *Based on a 75C rise in natural convection Thermal Curves based on 3.000 in length New Length 3.000 in mm Change Length Natural Convection Heat Sink Temperature Rise Heat Sink Above Ambient Thermal Resistance 40.0 2.00 30.0 1.50 20.0 1.00 10.0 0.50 0.0 0.00 5.0 15.0 25.0 35.0 45.0 5.0 15.0 25.0 35.0 45.0 Power Dissipated (W) Power Dissipated (W) Extrusion Profiles Page 2 of 3 Forced Convection Heat Sink Temperature Rise Heat Sink Above Ambient (50W Dissipated) Thermal Resistance Air Flow (m/s) Air Flow (m/s) 1.0 2.0 3.0 4.1 5.1 1.0 2.0 3.0 4.1 5.1 25.0 0.50 18.8 0.38 12.5 0.25 6.2 0.12 0.0 0.00 200 400 600 800 1000 200 400 600 800 1000 Air Flow (LFM) Air Flow (LFM) Building a Part Number Full Bar Length = 8.50ft Base RoHS Bar Finish Length Part (use zeros for full or half bars) Length 5 digit Compliant 1 Full (normally 8-ft) F Unfinished 0 0 0 0 0 base NO 2 Half (small cut fee) F Unfinished 0 0 0 0 0 part required Compliant 3 Custom B Black Anodized length in inches Add (cut to specified length) U Unfinished* to three decimal places** 3 V AavSHIELD Not C Gold Chromate Compliant 81640 3 U 0 6 5 0 0 G *For unfinished extrusions with cut lengths other than half bar, the finish designation is a U. **If the part is less than 10 inches, the first of these 5 digits (digit 7 of the 13 digit series) would be a zero (0). Examples: If you wanted to simply order extrusion 81640 in standard bar form, the part number would be: 816401F00000. The unit price would be sold by the foot. If you wanted extrusion 81640 cut to a length of 6.500 and black anodized, the part number would be: 816403B06500G. The unit price would be by the piece. If you wanted extrusion 81640 cut to a length of 14.725 and a wash finish, the part number would be: 816403U14725G. The unit price would be by the piece. If you wanted extrusion 81640 cut to a length of 14.725 and Gold Chromate finish, the part number would be: 816403C14725. The unit price would be by the piece. Standard Aavid Thermalloy parts require all 12-13 positions to be complete.