TO-3 Silicone Rubber Insulating Kit – Pack of 4 (JAYCAR)

You need electrical isolation between a TO-3 transistor and its heatsink, and you don't want to cut up mica sheets or smear grease everywhere. This kit gives you ready-made silicone rubber insulators shaped for the TO-3 package. Four in the pack, so you've got spares if one gets nicked during install. Drop it in place, torque the screw, circuit's isolated. No cutting, no trimming, no "will this actually fit" moment mid-solder

• Silicone rubber insulating washers sized specifically for TO-3 transistor packages
• Pack of 4 provides spares for multi-device builds or future replacements
• Ready-made shape – no cutting, trimming, or guesswork required
• Clean electrical isolation between transistor lead frame and heatsink
• Replaces messy grease-and-mica combos with a single, shaped part