Strachan hammered 48 off 19 balls and Jeffrey managed 30 off 15 balls to lift the visiting Outlaws to 6-170 off their 20 overs, with 72 runs coming off the final four overs when the Orana middle-order maulers went ballistic late.

It proved the difference, too.

Despite Joey Coughlan's terrific 61 off 53, and cameos from Connor Slattery (24 off 18), Henry Shoemark (19 off 11) and Adam Ryan (24 off 13), the latter managing to find the rope after injuring his hamstring and requiring a runner, Central West couldn't land a killer blow, not quite like Strachan and Jeffrey did for the Orana boys.

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The seven-run loss marks the first time in two years Central West won't progress through to the finals at the Sydney Cricket Ground, with Orana now a win away from making the trip to the hallow turf, where they won the Regional Bash crown in 2016.

Strachan (1-27) managed to pick up the early wicket of Ryan Peacock, too, while Jeffrey (2-16) bowled Coughlan in a key moment of the Wranglers' chase, proving the pair two of the players to watch as the Regional Bash continues.

"I've been seeing them well," Strachan said.

"In the end there myself and Marty were lucky to get a hold of a few. That last knock, we scored 72 in the last four overs, it proved the difference in the end."

The pair came together with Orana's innings precariously poised at 5-97 after CYMS all-rounder Hugh Le Lievre (4-26) proved tough to handle for the Outlaws top order, but the next four overs were anything but perilous for the visitors.

Strachan said the injection of a few older heads in the Outlaws side was the key.

"We had that experience a few years ago and we made three finals in a row. These guys have pipped us the last few years and they've got a quality side. This year, we picked a side to come out of the west and get back to the SCG," Strachan said.

Coughlan dominated a 61-run second-wicket stand with Mick Curtale (13) before combining well with Slattery for the third wicket too.

But Slattery was run out in a mix-up with Coughlan in the middle overs, and then the star Wranglers' opener lost his wicket to a ripping Jeffrey leg-spinner soon after.

When Orana erupted, the Wranglers limped, and that mini slump where the hosts lost 2-2 sucked the momentum out of their chase.

"We were setting up nicely," Coughlan said.

"We saw what they did in their innings and went big, late, but their spinners did the job through the middle overs.

"They tied it down and made it tough to get those singles, and that's probably what won it for them. Eight singles proved the difference."

Coughlan couldn't be critical of the Wranglers' efforts in the field at the back end of the Orana innings.

The exuberance of youth meant Central West's young attack was at times sporadic with its length, but Coughlan says it's an experience those boys will learn from.

"That's tough - the boys we threw the ball too, they'll learn from that and come back bigger and better next year. They're genuine quicks, and it's good to see that in the area," he added.

The Thunder Pool 1's other clash was between the South Coast Crew and Illawarra Flames, but it was a wash out.