This part is a kind of semiconductor called 6A1.

Function of this product has 6.0A SILICON RECTIFIER.

Manufacturers : Diodes Incorporated

Image and pinout :

Some of the text within the PDF file :

6A05 - 6A10 6.0A SILICON RECTIFIER Features · · High Surge Current Capability Low Leakage and Forward Voltage Drop A B A Mechanical Data · · · · · Case: R-6, Molded Plastic Terminals: Axial Leads, Solderable per MIL-STD-202, Method 208 Polarity: Color Band Indicates Cathode Approx. Weight: 2.1 grams Plastic Material - UL Flammability Classification 94V-0 D R-6 Dim A B C D Min 25.40 8.60 1.20 8.60 Max 9.10 1.30 9.10 C All Dimensions in mm Maximum Ratings and Electrical Characteristics @25°C unless otherwise specified Ratings at 25°C ambient temperature unless otherwise specified. Single phase, halfwave, 60Hz, resistive or inductive load. Characteristic Maximum Recurrent Peak Reverse Voltage Maximum RMS Voltage Maximum DC Blocking Voltage Maximum Average Forward Rectified [ ... ]

6A1 PDF Datasheet Download