Hi-Lok Fasteners
Hi-Lok is a registered trademark of the Hi-Shear Corporation. The most current version of the drawings below can be found at https://www.lisi-aerospace.com/en/. 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.
Hi-Lok® cannot 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 problems.
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Standard Configuration Hi-Lok® Pins* |
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Selection Guide |
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Minimum Shear Strength** |
Material |
Suggested Maximum Temperature (subject to finish)** |
Head Style |
Nominal size shank |
1/64″ oversize shank |
1/32″ oversize shank |
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95 Ksi |
6Al-4V Titanium |
750º F |
Protruding Shear |
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100º Reduced Flush Shear |
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Protruding Tension |
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100º Flush MS24694 Tension |
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95 Ksi |
Alloy Steel |
450ºF |
Protruding Shear |
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100º Reduced Flush Shear |
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Protruding Tension |
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100º Flush MS24694 Tension |
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95 Ksi |
A-286 Hi- Temperature Alloy |
1200ºF |
Protruding Shear |
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100º Reduced Flush Shear |
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Protruding Tension |
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100º Flush MS24694 Tension |
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45Ksi |
7075 – T6 Aluminum |
250ºF |
Protruding Shear |
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100º Flush MS20426 Shear |
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125 Ksi |
PH13-8Mo |
600ºF |
Protruding Shear |
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100º Reduced Flush Shear |
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Protruding Tension |
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100º Flush MS24694 Tension |
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125 Ksi |
Inconel 718 |
1200ºF |
Protruding Shear |
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100º Reduced Flush Shear |
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Protruding Tension |
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100º Flush MS24694 Tension |
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| * Refer to standards pages for recommended mating collars | |||||||
| ** Shear strength at room temperature | |||||||
Other Hi-Lok Pins
| HL 860 |
Hi-Lok Collars
Standard and Forged Collar Selection Guide:
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Collar Configuration |
Application |
Materials |
For use with Nominal Size Shank HL Pins |
For use with 1/64″ Oversize Shank HL Pins* |
For use with 1/32″ Oversize Shank HL Pins* |
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Basic:
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Shear |
2024 Al. |
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Stainless Steel |
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A-286 CRES |
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Titanium |
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Tension |
Stainless Steel |
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A-286 CRES |
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Titanium |
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17-4PH CRES |
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Self-Aligning:
for use on 7° max sloped surface |
Shear |
2024 Al. |
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Stainless Steel |
HL449 | ||||
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A-286 CRES |
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Tension |
Stainless Steel |
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A-286 CRES |
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Titanium |
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17-4PH CRES |
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Self-sealing:
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Shear |
2024 Al. |
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
| HL29 |
| HLM37 |
| HL1054 |
Hi-Lok Mechanical Lock Pins
| HL227 | HL233 | HL252 |
| HL349 | HL358 |
Hi-Lok Mechanical Lock Collars
| HL584 | HL585 |
Metric Hi-Lok Pins
| HLM10 | HLM11 | HLM12 | HLM13 |
| HLM20 | HLM21 | HLM29 | HLM41 |
| HLM310 | HLM311 | HLM341 | HLM411 |
| HLM419 |
Metric Hi-Lok Collars
| HLM70 | HLM73 | HLM75 | HLM78 |
| HLM80 | HLM82 | HLM86 | HLM94 |
| HLM175 | HLM370 | HLM394 |
