A late penalty from Jordan Hallam rescued the Blades a point against Birmingham City in the Professional Development League.
Substitute Hallam confidently stepped up from 12 yards late to make it four games unbeaten for Derek Geary's side and United could have snatched a win late on.
It was a game a very few chances against the Blues, with the United having plenty of possession with creating many clear-cut opportunities.
The only meaningful action of the first period saw Greaves have a shot saved from a Smith cross, whilst at the other end, Pollard was alert to save an effort from distance.
The start of the second-half saw City playing with more intent and they took the lead in the 52nd minute with a long-range shot that dipped over Pollard.
But for the remaining 38 minutes, it was all the Blades and Parkhouse came within inches of levelling proceedings in the 68th minute, only to see his shot go narrowly wide of the far post with the goalkeeper beaten.
But United weren't to be denied and after substitute HALLAM won and converted a penalty in the 89th minute, Cummings hit the crossbar with a header deep into stoppage-time as the Blades almost picked up an unlikely victory.
Blades: Pollard, Portman, Graham, Ferguson, Cantrill, Ford, Hawkes (Parkhouse 57), Capello (Cummings 83), Greaves Burton, T.Smith (Hallam 74).
Unused: Gilmour, Warhurst.