The alliance will include partner and assistant secondments, referrals and aligning IT systems and training.
But the national firm also hopes the alliance will bolster its attempts to establish a presence in Germany.
Last year talks with Schurmann & Partners collapsed when US-based Coudert Brothers stole a march on the national practice and announced its intention to merge with the German firm.
But senior partner Julian Tonks confirms that Germany is still on the agenda, adding: "We think this is a very good model and we would like to replicate it in other key jurisdictions."
The move is also intended to bolster both firms' private equity work, with Pinsents aiming to take advantage of Sweden's technology market.