The highest number of appearances and the longest run of consecutive games are both marked today.
Tim Williamson is the record holder as far as appearances for Boro go, a record that will surely never be beaten.
Born Reginald Garnet Williamson, a nickname of Tim stuck, he was 5' 10" tall, quite short for a goalkeeper.
He was a centre-forward with Coatham Grammar School and was signed from Redcar Crusaders on April 1902.
The first of 602 games in league and cup for Boro came on April 19 1902 in a 2-0 home win over Bristol City, the last on March 24 1923 in a 0-1 home defeat against Cardiff City.
A qualified draughtsman with Teesside Bridge and Engineering, Williamson was a professional with Boro when he made his England debut against Ireland in February 1905, becoming England's youngest and Boro's first capped goalkeeper.
When he retired in April 1923, he was the oldest player ever to play with the club, a record that stood until Bryan Robson broke it some 74 years later.
David Armstrong was another with a nickname that made him uniquely identifiable, Spike.
Born in Durham in 1954, Spike worked his way through the junior ranks at Ayresome Park to make his debut with the first team in April 1972 in a 3-1 defeat away at Blackpool.
No-one could have guessed when took to the field for a 1-1 home draw with Aston Villa just under a year later on March 24 1973, that that game would be the first of 305 in succession.
He wore the number 8 shirt that day, but it was with 11 on his back that he became synonymous, a gifted player on the left side of midfield with a delivery rarely match to this day.
He was an ever-present in the all-conquering, promotion-winning, record-breaking team managed by Jack Charlton in the 1973/74 season and, astonishingly, through the following six seasons in Division One.
It was a run that came to an end when following a second round, second leg League Cup defeat at Ipswich on September 2 1980, he missed the next game, a 0-0 draw at home with Forest on September 6. The number 11 shirt that day was worn by Billy Askew.
Spike missed three just three games that season, but before the next one had started he had been transferred to Southampton for £600,000, having made in total 431 appearances for the club he had been with since he was nine.