The reality is that there is no single "official" time in the 40-yard dash at a Combine.
That said, Bo Jackson has the best verifiable time at a Combine with his 4.12 clocking at the New Orleans Superdome in 1986.
I assume you are referring to the 40 yard dash as it applies to American Football. Currently, there is no official recognition of any 40 yard dash time. The 40 yard dash, as measured by the NFL combine, uses a method slightly different than standard track & field. In Track and Field, the runner reacts to the starting gun, where as the NFL combine allows the runners to start whenever they want, with the timers starting precisely when the runner does. This gives the combine method around a .15 second advantage. Also, combine participants are timed using 2 methods - by coaches with hand-held stopwatches and electronically.
With that said, the fastest 40 yard dash runners on the planet are most likely world-class sprinters (Asafa Powell, Tyson Gay, Maurice Greene, Usain Bolt) whose track and field times would translate to very low 4 second range NFL combine-style 40 times.
Regarding the fastest 40 ever run by an NFL player, there are lots of players noted to have been clocked around 4.1, such as Darrell Green, Deion Sanders, Raghib Ismail, Joey Galloway to name but a few. There are also many notable burners over the years who could have no doubt ran in the 4.1 range, such as Willie Gault, Bob Hayes, Cliff Branch and so on. There have been pure sprinters who have tried their hands at pro football who also should be mentioned, such as Renaldo Nehemiah, Alexander Wright and Jimmy Hines.
But it is Olympic athlete, Ben Johnson, who was believed to have run 40 yards faster than any human in history. Johnson is best known for injecting steroids and winning the 100 meters at the 1988 Olympics in Seoul in 9.79 seconds, only to have his gold medal and world record stripped after failing a post-race drug test.
Timing officials have since broken down that famed race into 10-meter increments, and Johnson was so preposterously fast that he went through 50 meters in 5.52 seconds and 60 meters in 6.37 - both under the current world records at the time at those distances. He went through 40 yards that day in 4.38 seconds. But, no matter how fast he was on steroids, Usain Bolt's legal 9.69 (9.55 without slowing) 100m time (40 yards of it) blows it away. Usain Bolt's 40 yard during his 100m record was likely a VERY low 4 such as 4.09 or 4.02.
Johnson runs a 4.24 Fastest in NFL
Devin Hester is capable of running the 40yard dash in 4.30!
4.1
Hi
William thomas(will thomas)
like 23mph
Which QB were you referring to? Masoli? Thomas? Dixon?
You have to be able to run at least a 5.5 40yard dash or else you have no chance.
The average oline 40yard dash is 5.24 sec.... 4.6-4.7 is prestige
The fastest runner in the world is presently Usain Bolt of Jamaica for men who holds the world record. For women it is Carmelita Jeter of the USA who holds the world leading 100 meter dash time.
It was Usain Bolt of Jamaica, who clocked a new world record of 9.69 in the 100 meter dash.
The Fastest 100 metres dash runner is Asafa Powell (Italian)