The bayonet cap used on our universally adjustable bayonet type thermocouple is designed to thread onto the specially sized stainless steel flexible armour. This feature allows the bayonet cap to be adjusted to any immersion depth required. When properly adjusted the spring action of the compressed flexible armour holds the bayonet cap in posistion and forces the thermocouple junction to securely bottom out in the hole. Maximum continuous operating temperature 900F (482C).