Harken - Black Magic 57mm AirBlocks

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Mfr. Harken

For use on sheets, halyards, running backstays and control lines of offshore boats
Roller bearings for high loads
High efficiency center caged bearings
Three-way head design
Carbon matrix rollers and balls
Three fasteners for quick disassembly
Headpost rides on plastic bushing
Easy to open integral becket
Optimal Line Diameter: 3/8"; Max - 7/16"
Available in high and low load configurations (See Description below)
Please click Additional Specs. below for additional product specifications

Similar Products

See Additional Specs.

Part No.	Mfr No.	Description	Safe Working Load (lbs)	Breaking Strength (lbs)	Shackle Pin Dia.	Unit	Leaves Warehouse*	List Price	Your Price Price	Qty.
57mm AirBlocks Double Swivel # 1952
70136	1952	Double Swivel - Low-Load	2755	5510	5/16"
57mm AirBlocks Double Swivel w/Becket# 1961
70141	1961	Double Swivel w/Becket - Hi-Load	3600	7200	5/16"
57mm AirBlocks Single Swivel # 1950
70134	1950	Single Swivel - Low-Load	1655	3310	1/4"
57mm AirBlocks Single Swivel # 1958
70139	1958	Single Swivel - Hi-Load	2500	5000	1/4"
57mm AirBlocks Single Swivel w/Becket # 1951
70135	1951	Single Swivel w/Becket - Low-Load	1655	3310	1/4"
57mm AirBlocks Single Swivel w/Becket# 1959
70140	1959	Single Swivel w/Becket - Hi-Load	2500	5000	1/4"
57mm AirBlocks Stand Up # 1965
70142	1965	Stand Up - Hi-Load	2500	5000	1/4"
57mm AirBlocks Triple Swivel # 1954
70138	1954	Triple Swivel	4850	9700	5/16"
*LEAVES WAREHOUSE: Does not include Weekends and Holidays. When will my order arrive? Add the Estimated Leaves Warehouse Time + Estimated Shipping Time.

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Additional Description

The Black Magic® AirBlocks® feature Torlon roller bearings and carbon black balls for strength, U.V. protection and reduced wear. The unique center cage separates rollers for less friction and side load ball bearings are protected by sculpted aluminum sideplates. Dissimilar metals are isolated to minimize corrosion.

Like all AirBlocks, the three-way head swivels lock in front/side positions. Blocks are easily disassembled with a single allen wrench.

NOTE on Mfr# 1965: 1/4" - Fastener circle: 1-15/32"

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pid: 70134F

Black Magic® 57mm AirBlocks®

Mfr. Harken

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