Harkenstore Product Category

57 mm Airblocks®
Use 57 mm Black Magic® AirBlocks® on offshore boats. These strong, lightweight blocks are sculpted aluminum, with Torlon® rollers and carbon-black balls for strength and UV protection. Rollers are housed in a unique center cage and are isolated for less friction. Blocks feature a three-way head system and come in high- and low-load configurations. Use for: Sheets Halyards Running backstays Control lines


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Prod #	Desc	Max. working load (lb)	Breaking load (lb)	Price
1951	57 mm Block with Becket	1655	3310	170.45
1952	57 mm Double Block	2755	5510	266.20
1954	57 mm Triple Swivel Block	4850	9700	395.65
1958	57 mm High-load Block	2500	5000	152.90
1959	57 mm High-load Block with Becket	2500	5000	186.40
1960	57 mm High-load Double Block	3600	7200	303.40
1961	57 mm High-load Double Block with Becket	3600	7200	321.95
3195	57 mm Single Loop Block	2500	5000	188.00
1950	57 mm Block	1655	3310	135.45

*1/4" (6mm) - fastener circle: 1 15/32" (37mm) L on end of roller indicates low-load

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