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-LOKTM in the structure improves the fatigue life of the airframe significantly when compared to other fastening systems, including swaged collar type.
The HI-LOKTM 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-LOKTM design does more with less, solving weighty problems and delivering high fatigue resistance without sacrificing strength. The lightweight HI-LOKTM 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-LOKTM system offers engineering designers a ready solution to a variety of assembly problems.
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Standard Configuration HI-LOKTM 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 |
