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Search by part #     Check distributor   part inventory    Browse Heat sinks   - By Device - Ball Grid Arrays Board Level DC-to-DC Converters Electrolytic Capacitors IGBT Modules LED Light Sources Microprocessors Surface Mount   - By Product Line - Bonded Fin Extrusion Profiles Folded Fin Forced Convection Heat Pipe Assemblies Liquid Cold Plates Max Clip System Polar Cap Coolers Standard Board Level   -Attachment Methods- Max Clips Microprocessor PC Board Mounting Semiconductor Ther-A-Grip   - Interface Materials - Double Sided Tapes Epoxies Gap Fillers Greases Insulating Films Insulating Pads Insulators Thin Films   - Accessories - Alignment Pads Card Ejectors Card Guides Clips Insulators Insulating Washers Mounting Kits Mounting Pads Stanchion Pads   Useful Links  • Building a part #  • Catalog Request  • Directions  • Find Distributor  • Find Sales Rep  • How to order?  • MSDS Safety Sheets  • Part # Cross Ref  • Quote Request  • RoHS Initiative  • Sample Request		Products / European Extrusions / European Extrusion Tolerances Working with Extrusions Extrusion Tolerances Uni 3879 (very similar to Din 1748) Explanation of tolerances UNI 3879 Matching Tolerances Effects of Anodization on Radiational Heat Transfer A (or B) mm (in) Tolerances mm (in) <A (or B) = 2 <A (or B) = (0.079) ± 0.15 ± (0.006) 2 <A < 3 (0.079) <A < (0.118) ± 0.20 ± (0.008) 3 <A < 5 (0.118) <A < (0.197) ± 0.25 ± (0.010) 5 <A < 10 (0.197) <A < (0.394) ± 0.30 ± (0.012) 10 <A < 15 (0.394) <A < (0.591) ± 0.25 ± (0.014) 15 <A < 30 (0.591) <A < (1.181) ± 0.40 ± (0.016) 30 <A < 50 (1.181) <A < (1.969) ± 0.50 ± (0.020) 50 <A < 80 (1.969) <A < (3.150) ± 0.80 ± (0.031) 80 <A < 100 (3.150) <A < (3.937) ± 1.00 ± (0.039) 100 <A < 120 (3.937) <A < (4.724) ± 1.20 ± (0.047) 120 <A < 150 (4.724) <A < (5.906) ± 1.30 ± (0.051) 150 <A < 200 (5.906) <A < (7.874) ± 1.50 ± (0.059) 200 <A < 250 (9.874) <A < (9.843) ± 1.80 ± (0.071) 250 <A < 300 (9.843) <A < (11.811)(1) ± 2.10 ± (0.083) (1) For A or B = 300 mm (11.81), tolerances supplied by customer. C mm (in) Tolerances mm (in) 5 <e < 15(2) (0.197) <e <0.591 15 <e < 30 (0.591) <e <(1.181) 30 <e < 60 (1.181) <e <(2.362) e < 60 e >(2.363) C = 5 (C = 0.197) ± .30 ± (0.012) ± .35 ± (0.014) ± .40 ± (0.016) ± .50 ± (0.020) 5 < C < 10 (0.197) < C < (0.394) ± .35 ± (0.014) ± .40 ± (0.016) ± .45 ± (0.018) ± .55 ± (0.022) 10 < C < 15 (0.3.94) < C < (0.591) ± .40 ± (0.016) ± .45 ± (0.018) ± .50 ± (0.020) ± .65 ± (0.026) 15 < C < 20 (0.591) < C < (0.787) ± .45 ± (0.018) ± .50 ± (0.020) ± .60 ± (0.024) ± .75 ± (0.030) 5 < C < 10 (0.787) < C < (1.181) ± .50 ± (0.020) ± .60 ± (0.024) ± .75 ± (0.030) ± .90 ± (0.035) 5 < C < 10 (1.181) < C < (1.969) ± .60 ± (0.024) ± .75 ± (0.030) ± .90 ± (0.035) ± 1.30 ± (0.051) 5 < C < 10 (1.969) < C < (2.756) ± .85 ± (0.033) ± .95 ± (0.037) ± 1.10 ± (0.043) ±1.45 ± (0.057) 5 < C < 10 (2.756) < C < (3.937) ± 1.05 ± (0.014) ± 1.10 ± (0.043) ± 1.25 ± (0.049) ± 1.65 ± (0.065) 5 < C < 10 (3.937) < C < (5.906) ±1.35 ± (0.053) ± 1.40 ± (0.055) ± 1.65 ± (0.065) ± 2.20 ± (0.087) 5 < C < 10 (5.906) < C < (7.874) ± 1.50 ± (0.059) ± 1.60 ± (0.063) ± 2.00 ± (0.079) ± 2.80 ± (0.110) 5 < C < 10 (7.874) < C < (9.943) ± 1.85 ± (0.073) ± 1.90 ± (0.075) ± 2.55 ± (0.100) ± 3.50 ± (0.138) 5 < C < 10 (9.943) < C < (11.811) ± 2.20 ± (0.087) ± 2.40 ± (0.094) ± 3.20 ± (0.126) ± 4.00 ± (0.157) (2) For e = 5 mm (0.197), tolerances equal B

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