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
be over-torqued; the collar's automatic breakoff
design assures this and eliminates the need for torque inspection.
As a highly efficient and dependable system.
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
For a complete list of available fastener document downloads click here!
Hi-Lok Pins are manufactured to the requirements of Hi-Shear Specification 342.
Installation guidelines are contained in the Hi-Lok Installation Manual.
Other Hi-Lok (HL) Pins:
Hi-Lok (HL) Collars:
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
All Posted Hi-Lok Collars:
Hi-Lok (HL) Mechanical Lock Pins:
Hi-Lok (HL) Mechanical Lock Collars:
Hi-Lok (HLM) Pins:
Metric Hi-Lok (HLM) Collars: