Sweden
57 mm/70 (2.25") SAK Marks 1, 2 and 3
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United States
57 mm/70 (2.25") Mark 110
Pictures

Updated 30 April 2013


WNSweden_57-70_mk123_mk1_pic.jpg

Swedish fast patrol boat Jagaren
57 mm/70 Mark 1 with 2-inch (5.1 cm) flare rockets on sides
Picture copyrighted by Bofors Defence



WNSwede_57-70_mk123_mk2_pic.jpg

Bofors 57 mm/70 Mark 2
Picture copyrighted by Bofors Defence



WNSweden_57-70_mk123_mk3_pic.jpg

57 mm/70 Bofors Mark 3
USN 57 mm/70 Mark 110
Note the small radar on top of the barrel
Image copyrighted by BAE Systems



WNSweden_57-70_mk123_mk3_sketch.jpg

57 mm Mark 3 showing standard and low radar cross-section (LRCS) mountings
This LRCS mounting was not adopted, see below for LRCS for DD(X)
Sketch copyrighted by United Defense



WNSweden_57-70_mk123_NSWCD_pic.jpg

57 mm/70 Bofors Mark 3 (EX 110) with all access hatches opened
Taken at Naval Surface Warfare Center Dahlgren (NSWCD) in November 2003
Note the 76 mm/62 Mark 75 at the right
USCG Photograph


WNSweden_57-70_mk123_mk3_reload_pic.jpg

57 mm EX (for Experimental) Mark 110 mounting with gun barrel in the reload position

During reloading, the gun barrel is raised to its maximum elevation, which lowers the ready use magazines.  The ammunition cassettes are then traversed over the tops of the ready-use magazines and empty their rounds into them.

In this photograph, the right-hand ammunition cassette is the curved box inside of the housing.  The tops of the ready-use magazines can be seen to the left of this cassette.  Note the triangular shape of the openings in the ready-use magazines, which guide the noses of the projectiles as they drop into the ready-use magazines.

Taken at Naval Surface Warfare Center Dahlgren (NSWCD) in November 2003
USCG Photograph


WNSweden_57-70_mk123_mk3_Test_Stand_pic.jpg

57 mm/70 Mark 110 on Test Stand in Louisville, KY
USCG Photograph


WNSweden_57-70_mk123_mk3_Test_Fire_pic.jpg

57 mm/70 Gun being test fired at Potomac River Test Range
USCG Photograph



WNSweden_57-70_mk123_NGSS_pic.jpg

57 mm being installed onto USCG Bertholf (WMSL 750) at Northrop Grumman Ship Systems in Pascagoula, Mississippi
Image copyrighted by BAE Systems



WNSweden_57-70_mk123_Bertholf_pic.jpg

57 mm gun on USCG Bertholf (WMSL 750) being fired on 11 February 2008 during Builder's Trials
This was the first time that the 57 mm gun was fired off a USA ship, with a total of 30 rounds being expended
ICGS Photograph


WNSweden_57-70_mk123_Freedom_pic.jpg

USS Freedom LCS-1 preparing for trials on 28 July 2008
Lockheed-Martin Photograph released as US Navy Photograph No. 080728-O-XXXXX-008


WNSweden_57-70_mk123_Ville_de_Quebec_pic.jpg

57 mm Mark 3 on HMCS Ville de Quebec
In the background is HMCS Haida
Photograph copyrighted by Mike Clark and used here by his kind permission



WNSweden_57-70_mk123_cutaway_pic.jpg

57 mm/70 Bofors Mark 3 (EX 110)
Cutaway view showing general arrangements, ammunition hoists and cassettes
USCG Photograph


WNSweden_57-70_mk123_test_round_pic.jpg

Test round being loaded into the breech on USCG Bertholf (WMSL 750)
Note the roomy gunhouse of this mounting and the twin ready use magazines directly above the breech
USCG Photograph titled "57mm"



Comparison of Bofors 57 mm (left) and 40 mm guns
Picture copyrighted by Bofors Defence


WNSweden_57-70_mk123_RCS_pic.jpg

57 mm LRCS Mounting for DD(X)
Image copyrighted by BAE Systems



WNUS_61-62_ags_DDX_pic.jpg

Artist’s concept of the DD(X) destroyer design by the Northrop Grumman Corporation Team
The two mountings on the bow are 155 mm AGS while the two on the hanger roof are 57 mm Mark 110
U.S. Navy Graphic 030606-N-0000X-002


Off-site Video

Video #1 and Video #2 of 57 mm gun in action at the USCG Website


Page History

29 July 2008 - Benchmark
04 December 2008 - Added USCG picture of test round being loaded, added new Off-site Video links
30 April 2013 - Added picture of HMCS Ville de Quebec