09-03-02a-Cylindrical_Bolt_Threaded-Description.pptx

Aeronautical Assemblies

Permanent Fasteners

Threaded Cylindrical Bolts Types and Description

Introduction

Four main types of basic cylindrical bolt-type fasteners are available:

• Hi-Lok (HL - HLR),
• Hi-Tigue (HLT),
• Hi-Lite (HST - HSTR),
• Pull-in (HPL).

General Description of the Complete Fastener

The complete fastener consists of a corps et d’un nut (often called  "collar") le plus souvent auto-cassant. Depending on the fastener and the desired strength, a standard nut can also be used.

BREAKAWAY SECTION

NUT

ACTIVE SECTION

BODY

General Description of the Family - Body

All three fastener types are composed of the same main elements:

• Une head (protruding or countersunk)
• Un shank (la partie active)
• Une threaded section (where the nut is screwed on)
• Une hollow recess pour maintenir la fixation pendant son installation (Hi-liteTM, Hi-lokTM et Hi-tigueTM)

Or

• Un taraudage pour le montage d’une tige de traction (Pull-inTM)

SHANK / SMOOTH SECTION

HEAD

THREADING

RECESS OR TAPPING

General Description of the Family - Body

In the new Hi-Lite and Hi-Lok, the hexagonal retention recess is replaced by hexagonale ASTERTM recess that provides better retention without damaging the fastener. Very effective for free-spinning and rotating installations (in composite materials, for example).

• Hi-Lok (HL - HLR)
• Hi-Tigue (HLT)
• Hi-Lite (HST - HSTR)

General Description of the Family - Body

The HI-TIGUE™ fastener design features a slight bead* slight bead* at the end of the smooth shank section. It enables bore calibration, thereby increasing the installed interference-fit fastener strength.

Optimized thread transition zone

HI-LOK™ HL / Hexagonal recess HLR / ASTER recess

HI-TIGUE™ HLT

HI-LITE™ HST / Hexagonal recess HSTR / ASTER recess

* : the bead has been intentionally exaggerated in the image for visibility.

HI-LITE™ bolts are the direct evolution of HI-LOK™ bolts. These fasteners, usable with clearance or interference fit, offer up to 13% weight savings compared to the HI-LOK™ generation.

HI-LOK™ bolts are the original solution for reliable, structurally resistant assemblies.

The HI-TIGUE™ bolt was the first fastener developed for interference-fit installation. It improves the fatigue life of lightly loaded structures.

General Description of the Family - Body

FASTENER BODY

PULL-IN™ HPL

PULL-IN™ bolts were developed to improve the shear fatigue performance of assemblies through a reliable and quiet interference-fit installation process. These fasteners are installed in tension, thus avoiding the difficulties associated with the driven insertion of the previous three fasteners, such as head or structure damage.

PULL ROD (INSTALLED)

TAPPING FOR ROD INSTALLATION

General Description of the Family - Head

HI-LOK™ Universal shear head

HI-LOK™ Universal tension head

HI-LOK™ 100° countersunk shear head

HI-LOK™ 100° countersunk tension head

General Description of the Family - Head

HI-TIGUE™ Universal shear head

HI-TIGUE™ Universal tension head

HI-TIGUE™ 100° countersunk shear head

HI-TIGUE™ 100° countersunk tension head

General Description of the Family - Head

HI-LITE™ Universal shear head

HI-LITE™ Universal tension head

HI-LITE™ 100° countersunk shear head

HI-LITE™ 100° countersunk tension head

HI-LITE™ Self-aligningalignante

Conception YA Group Pour LAUAK ESKOLA – Tous droits réservés.

General Description of the Family - Head

PULL-IN™ Universal tension head

PULL-IN™ 100° countersunk tension head

PULL-IN™ Self-aligningalignante

General Description of the Family – Nuts

Nuts can be of different types depending on the desired strength or the type of fastener.

Standard self-breaking nut, single hexagon

Standard self-aligning self-breaking nut, single hexagon

Standard self-sealing self-breaking nut, single hexagon

Standard self-breaking nut, double hexagon

Standard self-aligning self-breaking nut, double hexagon

Standard self-sealing self-breaking nut, double hexagon

Hi-Lite nut

STARLITE™ nut