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Hi-Lok Fasteners Hi-Lok is a registered trademark of the Hi-Shear Corporation. Hi-Lok pins are commonly used in applications that require high tensile strength in extreme environments. Hi-Loks pins and Hi-Lok collars offer extremely precise dimensions making Hi-Lok fasteners commonly used in space, military, and commercial aviation application. Hi-Lok pins and Hi-Lok collars are both threaded and require common installation tools making Hi-Lok Fasteners easy to install and remove. Hi-Lok is a
simple two-part fastener engineered to achieve in one all-purpose system the
design features suiting many of today's aerospace assembly needs. Consistent
torque on each fastener installed is achieved through the integrated functions
of the system working together. A carefully regulated breakoff groove in the self-locking Hi-Lok collar provides
uniform preload values by separating when the correct torque level is reached.
This controlled preload of each Hi-Lok® in the
structure improves the fatigue life of the airframe significantly when compared
to other fastening systems, including swaged collar type. The Hi-Lok® pin is held stationary by the installation tool while
the collar rotates. Progressive tightening takes place as torque is applied. At
the designed torque level built into the Hi-Lok®
collar, the hex portion of the collar is sheared off automatically by the
driving tool. As a versatile fastener, Hi-Lok® matches the best qualities of a bolt/nut or pin swaged collar combination. Tooling is easily adaptable to large scale production with high speed equipment and automatic collar feed attachments that handle up to 200 collars, affording installation rates of up to 45 fasteners per minute in some cases. The compactness of the Hi-Lok® tooling is in a class by itself when installation means reaching into hidden areas and next-to-impossible places. An extensive range of installation tools satisfies standard, offset and extended offset, 200, 900 and 1800 requirements. The Hi-Lok® design does more with less, solving weighty problems and delivering high fatigue resistance without sacrificing strength. The lightweight Hi-Lok® collar further contributes to weight-saving when compared to conventional nut and bolt systems of equal strength characteristics. Manufactured in a wide range of sizes and material combinations, in terms of versatility the Hi-Lok® system offers engineering designers a ready solution to a variety of assembly problems.
Hi-Lok Pins are manufactured to the requirements of Hi-Shear Specification 342. Installation guidelines are contained in the Hi-Lok Installation Manual.
Standard and Forged Collar Selection Guide:
Notes: * Oversize collars may be used with lower size shank pins. ** indicates forged-type collar configuration. Hi-Lok collars are manufactured to the requirements of Hi-Shear Specification 345. All Posted Hi-Lok Collars: Hi-Lok (HL) Mechanical Lock Pins: Hi-Lok (HL) Mechanical Lock Collars: Metric Hi-Lok (HLM) Collars:
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