This part is a kind of semiconductor called 6A1.

Function of this product has 6.0 AMP SILICON RECTIFIERS.

Manufacturers : Bytes

Image and pinout :

Some of the text within the PDF file :

6A05 6.0 AMP SILICON RECTIFIERS THRU 6A10 VOLTAGE RANGE 50 TO 1000 Volts CURRENT 6.0 Amperes R-6 FEATURES * Low forward voltage drop * High current capability * High reliability * High surge current capability .360(9.1) .340(8.6) DIA. 1.0(25.4) MIN. MECHANICAL DATA * Case: Molded plastic * Epoxy: UL 94V-0 rate flame retardant * Lead: Axial leads, solderable per MIL-STD-202, method 208 guranteed * Polarity: Color band denotes cathode end * Mounting position: Any * Weight: 1.65 grams .360(9.1) .340(8.6) .052(1.3) .048(1.2) DIA. 1.0(25.4) MIN. Dimensions in inches and (millimeters) MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS Rating 25 C ambient temperature uniess otherwies specified. Single phase half wave, 60Hz, resistive or inductive load. For capacitive load, derate current [ ... ]

6A1 PDF Datasheet Download