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.
 
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.


For a complete list of available fastener document downloads click here!

Standard Configuration Hi-Lok® Pins*

Selection Guide

Minimum Shear Strength**

Material

Suggested Maximum Temperature (subject to finish)**

Head Style

Nominal size shank

1/64" oversize shank

1/32" oversize shank

95 Ksi

6Al-4V 

Titanium

750º F

Protruding Shear

 

HL10

HL110

HL410

100º Reduced Flush Shear

 

HL11

HL111

HL411

Protruding Tension

 

HL12  

HL1012

HL112 HL1022

HL412 HL1032

100º Flush MS24694 Tension

 

HL13  

HL1013

HL113 HL1023

HL413

HL1033

95 Ksi

Alloy Steel

450ºF

Protruding Shear

 

HL18

HL62

HL218

100º Reduced Flush Shear

 

HL19

HL63

HL219

Protruding Tension

 

HL20

HL64

HL220

100º Flush MS24694 Tension

 

HL21

HL65

HL221

95 Ksi

A-286 

Hi-

Temperature

 Alloy

1200ºF

Protruding Shear

 

HL40

HL140

HL240

100º Reduced Flush Shear

 

HL41

HL141

HL241

Protruding Tension

 

HL48

HL248

HL748

100º Flush MS24694 Tension

 

HL49

HL249

HL749

45Ksi

7075 - T6 Aluminum

250ºF

Protruding Shear

 

HL22

HL122

HL258

100º Flush MS20426 Shear

 

HL23

HL123

HL259

125 Ksi

PH13-8Mo

600ºF

Protruding Shear

 

HL 644

HL744

HL844

100º Reduced Flush Shear

 

HL645

HL751

HL845

Protruding Tension

 

HL 646

HL746

HL846

100º Flush MS24694 Tension

 

HL 647

HL753

HL847

125 Ksi

Inconel 718

1200ºF

Protruding Shear

 

HL754

HL936

HL946

100º Reduced Flush Shear

 

HL701

HL937

HL947

Protruding Tension

 

HL 730

   

100º Flush MS24694 Tension

 

HL731

HL939

HL949

  * Refer to standards pages for recommended mating collars

  ** Shear strength at room temperature

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:

HL 860

     

Hi-Lok (HL) Collars:

Standard and Forged Collar Selection Guide:

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*

Basic:

Shear

2024 Al.

HL70

HL79

HL84

Stainless Steel

HL94

HL1094**

HL94

HL1094**

HL294

A-286 CRES

HL97

HL1097**

HL197

Titanium

HL379

HL379

HL491

Tension

Stainless Steel

HL86

HL87

HL1087**

HL1087A**

HL93

A-286 CRES

HL78

HL278

HL478

Titanium

HL198

HL198

 

17-4PH CRES

HL73

HL273

HL373

Self-Aligning:

for use on 7° max sloped surface

Shear

2024 Al.

HL82

HL82

HL382

Stainless Steel

HL175

HL175

 

A-286 CRES

HL185

HL297

HL185

HL297

 

Tension

Stainless Steel

HL75

HL75

HL375

A-286 CRES

HL275

HL275

 

Titanium

HL280

HL280

 

17-4PH CRES

HL89

HL89

HL289

Self-sealing:

Shear

2024 Al.

HL374

HL384

HL384A

HL374

HL384

HL384A

 

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:

HL70

HL73

HL75

HL77

HL78

HL79

HL82

HL83

HL84

HL86

HL86FN

HL87

HL89

HL93

HL94

HL95

HL97

HL175

HL182

HL185

HL197

HL198

HL273

HL275

HL278

HL280

HL289

HL294

HL297

HL373

HL374

HL375

HL379

HL382

HL384

HL384A

HL478

HL491

HL570

HL582

HL584

HL585

HL586

HL587

HL593

HL1087

HL1087A

HL1094

HL1097

 

Hi-Lok (HL) Mechanical Lock Pins:

HL227

HL233

HL252

 

HL349

HL358

   

Hi-Lok (HL) Mechanical Lock Collars:

HL584

HL585

   

Metric Hi-Lok (HLM) Pins:

HLM10

HLM11

HLM12

HLM13

HLM20

HLM21

HLM29

HLM41

HLM310

HLM311

HLM341

HLM411

HLM419

     

Metric Hi-Lok  (HLM) Collars:

HLM70  

HLM73

HLM75

HLM78

HLM80

HLM82

HLM86

HLM94

HLM175

HLM370

HLM394

 

 

 

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