Tungsten hairpin filaments are the standard type filaments widely used in Scanning Electron Microscopes, Transmission Electron Microscopes and Microprobe systems. Tungsten filaments are also called cathodes or electron emitters or electron sources. The high quality filaments we offer are made to the original equipment manufacturer's specifications using special tools to guarantee the correct shape for the filaments and to generate the optimum electron beam. The filaments are annealed i n vacuum, stress-free and precisely aligned before they are shipped. Please consult the list below for the correct type of filament for your SEM, TEM, or EPMA. The tungsten filaments are manufactured from high grade tungsten. Of all metals in pure form, tungsten has the highest melting point (3422°C / 6192°F), the lowest vapor pressure at temperatures above 1650°C (3000°F) and has the highest tensile strength. Tungsten also has the lowest coefficient of thermal expansion of any pure metal. This combination of properties makes tungsten the ideal material. Instrument New Filament # AEI 1403 AMR / AMRAY (except AMRAY 1200 series) 1421 AMRAY 1200 (Siemens style) ---- Cambridge Instruments (except and S4-10) 1403 Cambridge Instruments S4-10 (Siemens style) ---- Cameca ---- CamScan standard Siemens style ---- CamScan with AEI conversion 1403 CamScan with new TESCAN column 1427 ETEC 1406 FEI / Philips 1412 Hitachi S-type 1428 Hitachi Filament in Cartridge for TM3030, TM3000 and TM1000 1434 Hitachi HU-type ---- ISI / ABT / Topcon 2-pin 1425 ISI / ABT / Topcon 3-pin 1426 JEOL K-type type modern style 1407 Leica 1403 LEO 400 and 1400 Series 1403 LEO 1450 (except systems converted to AEI) 1427 MAC Probe ---- NORAN (ADAM) ---- Novascan (SEMCO) 1403 Philips V Loop (PSEM 500 and later, EM200 and later) 1412 RCA ---- TESCAN 1427-1 Siemens ---- ZEISS 1427 ZEISS EVO 1403 Dimensions for EM Filament Bases (for Tungsten/Lab6) Filaments Base Type Diameter of Ceramic discin mm Diameter of Pinsin mm Center Distance of Pinsin mm AEI 12.0 1.0 6.45 FEI/PHILIPS 26.0 1.0 5.0 JEOL K-type 28.0 1.2 8.0 HITACHI S-type 9.8 1.2 2.7 ZEISS (DSM & TEM)LEO (1450 & TEM)TESCAN 19.8 1.0 5.0 AMRAY (except 1200) 26.1 1.0 5.0 ISI/ABT/TOPCON2 pins 23.3 1.2 11.9 ISI/ABT/TOPCON 23.4 1.2 12.0 1403, -L,WRE AEI Base Filaments for ZEISS (EVO), LEO, AEI, Cambridge (except S4-10), Novascan, Leica Diameter of ceramic disc: 12.0mmDiameter of pins: 1.0mmCenter to center distance of pins: 6.45mm 1412 FEI and Philips Standard V Loop Filaments Diameter of ceramic disc: 26.0mmDiameter of pins: 1.0mmCenter to center distance of pins: 5.0mm 1407 JEOL K-type Filaments Ceramic in stainless steel alignment ring.Diameter of ceramic disc: 28.0mmDiameter of pins: 1.2mmCenter to center distance of pins: 8.0mm 1428 Hitachi S-type Filaments (newer H-, S- and X- series)Diameter of ceramic disc: 9.8mmDiameter of pins: 1.2mmCenter to center distance of pins: 2.7mm 1434 Hitachi Filament in Cartridge 1427. 1427-1 ZEISS (DSM Series and TEM), LEO (TEM 900 Series), LEO (SEM 1450 Series), TESCAN Filaments Diameter of ceramic disc: 19.8mmDiameter of pins: 1.0mmCenter to center distance of pins: 5.0mm 1421 AMRAY Filaments, except AMRAY 1200 Series Diameter of ceramic disc: 26.1mmDiameter of pins: 1.0mmCenter to center distance of pins: 5.0mm 1425 ISI / ABT / Topcon Filaments, 2-prong curved pins Diameter of ceramic disc: 23.3mmDiameter of pins: 1.2mmCenter to center distance of pins: 11.9mm 1426 ISI / ABT / Topcon Filaments, 3-prong Diameter of ceramic disc: 23.4mmDiameter of pins: 1.2mmCenter to center distance of pins: 12.0mm 1406 ETEC 0.004" and 0.005" tungsten wire thickness
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