The Blues were again unlucky to have appeals turned down for a penalty when Danny Walsh was pushed over in front of goal in the 47th minute, but had enough chances to have sewn up the spoils.
James Ashmore picked out Walsh in the fourth minute, only for him to drag a 20 yard drive wide, and Jack Watts
reacted quickly to intercept a back pass two minutes later but his shot was palmed to safety by United keeper Terry Smith.
Another shot from Watts was diverted off the line by Chris Rimmer in the 32nd minute and the corner kick was only half cleared, but Ashmore's cross was headed over by Lincoln Adams.
had to go full stretch to turn a 25 yard free-kick by Peter Wright around the near post in the 36th minute, play switching to the other end where Alex Callery
picked out Walsh and his effort was well held by Smith.
replaced Watts in the 59th minute, and the Blues tried to raise the tempo, Walsh knocking a ball inside to Ashmore who extended Smith with a 25 yard drive two minutes later.
A free-kick from Stuart Ludlam
dropped to Longstaff in the 62nd minute, but his shot on the turn lacked power, while Callery burst down the right and cut inside four minutes later, only to pull his low shot off target.
Callery whipped in a free-kick from the right in the 71st minujte which Smith could only palm down, but the ball was hastily cleared by Alex Frost.
The deadlock was broken in the 79th minute, Madeley getting down the right and, while Billard parried his first effort, he followed up to ram in the rebound.
rode three tackles in the 81st minute before finding Longstaff, but Smith again smothered his shot, and while Ben Leonard
came on, the Blues never looked like getting on terms.
Frickley: Adam Billard
, Stuart Ludlam
, James Kay
, Danny Walsh (Ben Leonard
84min), Lincoln Adams, Michael Simpkins
, Alex Callery
, James Ashmore, Jack Watts
59min), Ryan Mallon (Brad Grayson 78min), Leon Henry
; unused subs, Karl Jones, Kelvin Bleau.
Ashton: Terry Smith, Alex Frost, Josh Rose, Ged Murphy, George Melling, Chris Rimmer, Wayne Cahill, Ian Bennett, Chris Amadi (Jonathan Bathurst 74min), Peter Wright (Aaron Burns 74min), Liam Dawson (Sam Madeley 64min); unused subs, Ben Smith, Danny Lambert.
Referee: Mr Howard Rowbotham