Piston Pin Lock Ring
Genuine Mercury Marine Piston Pin Lock Ring.
Mercury Marine PN: 40-20057
Fits:
Mercury 100, 150, 200, 250 S/N: 1290910 THRU 1499331
Mercury 200hp S/N: 1558310 THRU 1866495
Mercury 200hp S/N: 1866496 THRU 2296266
Mercury 300 350 S/N: 1271884 THRU 1448139
Mercury 400 S/N: 1279685 THRU 1476509
Mercury 450, 45hp (4 CYL.) S/N: 1476510 THRU 1531568
Mercury 500 S/N: 1421113 THRU 1639472
Mercury 500 S/N: 1639473 THRU 1755548
Mercury 500 S/N: 1755549 THRU 2097444 CAN
Mercury 500 S/N: 1770179 THRU 2116317 USA
Mercury 500 S/N: 2097445 THRU 2305100 CAN
Mercury 500 S/N: 2116318 THRU 2305100 USA
Mercury 600 (6 CYL.) S/N: 1303411 THRU 1542744
Mercury 700 (6 CYL.) S/N: 1296411 THRU 1413610
Mercury 700 (6 CYL.) S/N: 1413611 THRU 1566239
Mercury Mark KE7, KF7, KG4, KG7 - 1939 THRU 1953 S/N: ALL
Mercury Mark MARK 10, 10A, 15A, 28, 28A, 28AD S/N: ALL
Mercury Mark MARK 20, 15, KH7, WG7 S/N: ALL
Mercury Mark MARK 20H S/N: ALL
Mercury Mark MARK 25, 25E S/N: ALL
Mercury Mark MARK 30, 30E S/N: ALL
Mercury Mark MARK 30H, 55H S/N: ALL
Mercury Mark MARK 35A S/N: ALL
Mercury Mark MARK 40, KG9, KF9 S/N: ALL
Mercury Mark MARK 50, 50E S/N: ALL
Mercury Mark MARK 55, 55E S/N: ALL
Mercury Mark MARK 55AE, 55AM, 58AE, 58E S/N: ALL
Mercury Mark MARK 75 S/N: ALL
Mercury Mark MARK 75A, 78, 78A S/N: ALL
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About Us
Doug Russell Marine – A Family-Owned Tradition for Nearly Seven Decades
Founded in 1956 and located west of Boston in Worcester, Massachusetts, Doug Russell Marine has been family-owned and operated since the beginning. Our commitment to quality, integrity, and customer satisfaction has made us one of the most trusted names in the marine industry.
We maintain one of the largest and most comprehensive marine parts departments in the world, with over 100,000 parts and more than 1,000 sterndrives and engines in stock and ready to ship. Known worldwide for our expertise in sterndrive and engine repower, we proudly represent top brands including Mercury Marine / Mercruiser, Volvo Penta, OMC, Johnson/Evinrude, and Yamaha Outboards. We also offer parts and service for Sea-Doo and Yamaha Personal Watercraft, as well as quality trailers from Karavan and Venture.
Experience You Can Trust
Over the years, we’ve built a reputation not only for our unmatched inventory but also for our deep product knowledge and exceptional service. Our factory-trained technicians and dedicated sales professionals share a genuine passion for boating and for helping every customer find the right solution — whether it’s a replacement part, a new engine, or an entire boat package.
Our long-standing manufacturer relationships and strong buying power allow us to offer competitive pricing without compromising on quality or support. From first-time boaters to seasoned captains, every customer receives the same personalized attention, expert consultation, and after-sale care that have defined Doug Russell Marine since day one.
