AGL Component Library By Precision AGL Academy

Fasteners

The essential hardware that holds AGL fixtures together — from screws and bolts to nuts, washers, and rivets. Engineered for corrosion resistance, precise torque control, and reliable performance in the demanding airfield environment, ensuring secure mechanical joints and electrical continuity.

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Overview

What Are Fasteners?

Fasteners are a broad category of hardware components used to mechanically join two or more objects together in AGL fixtures. This includes screws, bolts, nuts, washers, studs, and rivets. In the airfield environment, fasteners must withstand extreme temperature variations, moisture, UV radiation, chemical exposure (de-icing fluids, jet fuel), and continuous vibration from aircraft operations. They are typically made from corrosion-resistant materials such as stainless steel (A2/A4), brass, or coated carbon steel. Fasteners are critical not only for structural integrity but also for electrical continuity (bonding/earthing) and for maintaining the precise optical alignment of fixtures. The correct selection, torque specification, and anti-seize treatment are essential for reliable long-term performance and safe maintenance practices.

Purpose

Purpose & Function

A fastener that backs off under vibration does not just create a loose part — in an AGL fixture it can shift the optical alignment the whole installation was set up to achieve, open a gap in an environmental seal, or break the bonding path that keeps the fixture's metal housing at earth potential. Fasteners exist to hold these assemblies together against exactly that kind of slow, continuous loosening: correctly specified grade, torque, and anti-seize treatment keep a joint clamped tightly enough to resist vibration and thermal cycling over years of service, rather than months. Beyond pure mechanical clamping, fasteners are also frequently the intended electrical bonding path between a fixture's components and its earth connection, so specifying and torquing them correctly is a safety requirement, not just a structural one.

Application

Where Are They Used?

Fasteners are used in every assembly and installation step of AGL systems, including:

Fixture Assembly: Securing the top cover to the bottom housing, mounting the lens, prism, and reflector.
Mounting: Attaching the fixture flange to the base plate, base can, or frangible pole.
Cable Connections: Screws and washers for terminal blocks and earthing connections.
Junction Boxes and Enclosures: Securing covers and cable glands.
CCR and Control Panels: Mounting components and securing cabinet doors.
Signage and Wind Cones: Mounting structures and securing sign faces.
Frangible Couplings: Shear pins and frangible nuts for breakaway mechanisms.

Placement

Installation & Location

Fasteners are selected and installed to match the specific joint they serve — anchor bolts embedded in or through the foundation concrete, structural bolts through base plates and flanges, and machine screws securing lens frames, terminal covers, and internal brackets — rather than treated as a single generic hardware item, since the load path and torque requirement differ significantly between a foundation bolt and a lens-retaining screw. Corrosion-resistant grades (stainless steel or hot-dip galvanized) are used throughout given the airfield's outdoor, often coastal or de-icing-fluid exposure, and torque is set to the manufacturer's value for each specific joint type — under-torquing an optical housing's screws risks a water-ingress path, while over-torquing a frangible assembly's bolts can raise its break force out of specification.

Function

How Do They Work?

Fasteners work by creating a clamping force that holds components together, using either a threaded engagement (screws, bolts, studs) or a permanent deformation (rivets). In threaded fasteners, the torque applied to the bolt or screw creates a preload that clamps the joint, providing frictional resistance to separation and shear forces. Key aspects include:

Thread Engagement: The number of engaged threads and the thread pitch determine the joint's strength and resistance to loosening.
Torque Control: Proper torque is critical — over-torquing can strip threads or break the fastener, while under-torquing can lead to loosening and joint failure.
Anti-Seize and Thread Locking: Anti-seize compounds prevent galling and corrosion, while thread-locking adhesives (e.g., Loctite) prevent loosening due to vibration.
Washer Function: Washers distribute the load, prevent damage to surfaces, and can provide spring tension (Belleville washers) to maintain clamping force under thermal cycling.
Earthing/Bonding: In metallic fixtures, fasteners can provide electrical continuity for earthing and EMI protection.

In frangible applications, fasteners (shear pins) are designed to fail at a predetermined load to provide breakaway performance.

Architecture

System Architecture & Control Logic

Fasteners have no control logic of their own — they are the clamping layer repeated at every mechanical joint across the fixture assembly: base can to pavement or foundation, cover plate to base can, fixture body to frangible coupling, mounting flange to pole. None of these joints carries a signal or is visible to the ALCMS; their condition is verified by torque-checking during scheduled maintenance, not by any electronic status. What does vary joint to joint is the fastener grade and torque specification, set by the load and environment at that specific connection (a frangible coupling's shear pins are engineered to release at a defined load, which is a very different requirement to a structural anchor bolt's fasteners, which are meant never to release).

No joint fastener reports status to the ALCMS — condition is confirmed by physical inspection and torque-checking alone.

Function

What Torque Delivers

Torque Applied to Fastener

Creates clamping preload across the joint

Thread Engagement

Pitch & engaged length resist separation and shear

Anti-Seize / Thread-Lock

Prevents galling, corrosion & vibration loosening

Washer Function

Distributes load, maintains clamp force through thermal cycling

Earthing / Bonding

Provides electrical continuity across metallic fixture parts

Secure Joint — Mechanical & Electrical Integrity Maintained

In frangible applications, shear pins are deliberately tuned to fail instead

Construction

Physical Construction

AGL fasteners are machined or cold-formed from stainless steel (A2/A4), brass, zinc-plated carbon steel, or titanium, with thread forms and head styles (hex, socket cap, pan, countersunk, or tamper-resistant Torx) selected to suit the joint's access, load, and security requirements. Stainless grades are passivated after machining to restore and stabilise their corrosion-resistant chromium oxide layer, while carbon-steel fasteners receive a zinc or other plated finish to protect the base metal in outdoor service. Where fasteners must resist loosening under the vibration and thermal cycling typical of airfield fixtures, they are supplied with a nickel- or copper-based anti-seize compound to ease future removal, or a medium-strength threadlocker to maintain preload without permanently bonding the joint. Strength grades (A4-70 for stainless, 8.8/10.9/12.9 for carbon steel) are matched to the specific application's torque and load requirements, with tamper-resistant head styles reserved for fasteners on publicly accessible or security-sensitive fixtures.

Specification

Technical Parameters

Parameter	Typical Value
Material	Stainless steel (A2, A4), brass, zinc-plated carbon steel, or titanium
Corrosion Resistance	Passivated (stainless), nickel-plated (brass), or galvanized
Thread Type	Metric (M3, M4, M5, M6, M8, M10, M12) or UNC/UNF (imperial)
Head Type	Hex head, socket cap, pan head, countersunk, or tamper-proof (Torx, Security Torx)
Strength Grade	A4-70 (stainless), 8.8, 10.9, 12.9 (carbon steel)
Torque Range	Specified per fastener size and material (typically 2-50 Nm)
Operating Temperature	-40°C to +100°C (stainless), -40°C to +80°C (coated steel)
UV Resistance	Excellent (metal), good (coated)
Chemical Resistance	Resistant to de-icing fluids, jet fuel, hydraulic fluids
Anti-Seize/Threadlocker	Nickel or copper-based anti-seize; medium-strength threadlocker (e.g., Loctite 243)

Compliance

Applicable Standards

ISO 898-1

Mechanical properties of fasteners made of carbon steel and alloy steel

ISO 3506-1

Mechanical properties of corrosion-resistant stainless steel fasteners

FAA AC 150/5345-46

Specification for Runway, Taxiway, Heliport, and Vertiport Light Fixtures — covers fixture hardware and construction requirements

Prerequisites

Installation Requirements

Joint-Specific Fastener Selection

Mechanical

Match each fastener to the specific joint it serves — foundation anchor bolt, structural flange bolt, or lens/cover screw — rather than substituting a generic equivalent, since load path and torque requirement differ significantly between joint types.

Corrosion-Resistant Grade Verification

Mechanical

Confirm stainless steel or hot-dip galvanized grades are used throughout given the airfield's outdoor, often coastal or de-icing-fluid exposure.

Torque Setting to Manufacturer's Value

Mechanical

Set torque to the manufacturer's value for each specific joint, since under-torquing an optical housing risks a water-ingress path while over-torquing a frangible assembly can raise its break force out of specification.

Anti-Seize/Threadlocker Application

Mechanical

Apply anti-seize compound or medium-strength threadlocker where specified, so fasteners resist loosening under vibration and thermal cycling without permanently bonding the joint.

Fitment Sign-off

Documentation

Record fastener grade, torque values applied, and any threadlocker/anti-seize used, as-built for each joint before the assembly is accepted into service.

Verification

Testing & Commissioning

Grade & Material Verification

Pre-Installation

Confirm each fastener's strength grade and material match the specification for its joint, particularly on load-bearing or bonding connections.

Torque Verification

Final Acceptance

Torque every fastener to its specified value using a calibrated torque wrench, since under- or over-torquing both compromise joint integrity.

Anti-Seize / Threadlocker Application Check

Pre-Installation

Confirm anti-seize or threadlocker has been applied where specified, protecting against galling and vibration-induced loosening.

Earth Bonding Continuity Test

Final Acceptance

Where fasteners form the intended electrical bonding path, verify continuity to earth potential meets the required resistance.

Optical Alignment Verification

Final Acceptance

Confirm fixture alignment fasteners hold the intended aim without shifting once torqued, since a loose fastener here alters the beam pattern.

Corrosion Compatibility Check

Pre-Installation

Confirm fastener material is galvanically compatible with the surrounding hardware to avoid accelerated corrosion at the joint.

Documentation & As-Built Sign-off

Final Acceptance

Record fastener grade, torque values, and threadlocker/anti-seize application in the commissioning dossier for handover.

Upkeep

Inspection & Maintenance

Torque Verification

Annual

Re-torque fasteners to the specified value for their size and grade; both under- and over-torquing accelerate loosening or thread failure.

Corrosion & Passivation Check

Annual

Inspect stainless fasteners for surface rust bleed or galvanic corrosion, particularly where dissimilar metals (e.g., stainless bolts in aluminium housings) are in contact.

Thread Condition Check

Annual

Check threads for galling, cross-threading damage, or stripping, especially on fasteners that have been repeatedly removed for maintenance access.

Threadlocker / Anti-Seize Renewal

As needed

Reapply anti-seize or medium-strength threadlocker whenever a fastener is removed and reinstalled, to prevent seizing and maintain vibration resistance.

Tamper-Proof Head Inspection

Annual

Verify Torx, Security Torx, or other tamper-resistant heads are intact and undamaged, especially on publicly accessible fixtures.

Chemical Exposure Review

Annual

Check fasteners exposed to de-icing fluid, jet fuel, or hydraulic fluid for coating breakdown, replacing where corrosion resistance has been compromised.

Missing / Loose Fastener Sweep

Semi-annual

Visually confirm all fastener positions on a fixture are filled and snug, since a single missing fastener can accelerate fatigue on the remainder.

Grade / Material Match Verification

Annual

Confirm any replaced fasteners match the original strength grade and material to avoid introducing a weaker point or galvanic corrosion risk.

Field Notes

Common Field Issues

Corrosion & Galling of Stainless Steel

Stainless steel fasteners can suffer from galling (cold welding) when tightened without lubrication, especially in humid environments. Use anti-seize compounds and ensure proper surface finish to prevent this.

Loosening Due to Vibration

Continuous vibration from aircraft and ground vehicles can cause fasteners to loosen over time. Use thread-locking adhesives (e.g., Loctite) and consider lock washers or Belleville washers to maintain preload.

Over-Torque Damage

Using improper torque tools or over-tightening fasteners can strip threads, break bolts, or crack housings. Always use a calibrated torque wrench and follow the specified torque values.

Incorrect Fastener Material

Using carbon steel fasteners without adequate corrosion protection in outdoor applications leads to rust and seizing. Always use stainless steel (A4 for marine environments) or galvanized equivalents.

Mixing Metric and Imperial Threads

Using a metric bolt in an imperial thread (or vice versa) can cause cross-threading and joint failure. Always verify thread compatibility before installation.

Shear Pin Replacement Errors

Replacing a frangible shear pin with a standard bolt removes the breakaway function, posing a severe safety risk. Always use the specified frangible fastener kit.

Diagnostics

Troubleshooting Guide

Fastener Seizes or Galls During Installation or Removal

Likely Cause

Stainless steel threads have cold-welded (galled) from being tightened without lubrication, especially in a humid environment.

Diagnostic Steps

Check whether anti-seize compound was applied at installation; inspect the thread surface finish and galling extent if the fastener has already seized.

Corrective Action

Apply an anti-seize compound to replacement fasteners before installation, and replace a galled fastener rather than forcing it further.

Fastener Found Loose During Routine Inspection

Likely Cause

Vibration from aircraft and ground vehicle traffic has gradually backed the fastener off its preload.

Diagnostic Steps

Check for the presence and condition of thread-locking adhesive, lock washers, or Belleville washers on the joint; measure remaining preload/torque against the specified value.

Corrective Action

Re-torque to the specified value and add thread-locking adhesive and/or lock or Belleville washers to maintain preload against ongoing vibration.

Stripped Threads, Broken Bolt, or Cracked Housing After Installation

Likely Cause

Over-torque damage from an uncalibrated tool or exceeding the specified torque value.

Diagnostic Steps

Inspect the fastener and mating threads/housing for stripping or cracking; check whether a calibrated torque wrench and the correct torque specification were used.

Corrective Action

Replace the damaged fastener and, where applicable, the damaged housing/threaded insert, and re-install using a calibrated torque wrench set to the specified value.

Rust or Seizing on an Outdoor Fastener

Likely Cause

An incorrect fastener material (e.g., uncoated carbon steel) was used in an outdoor application without adequate corrosion protection.

Diagnostic Steps

Inspect the fastener material and finish against the specification for the application; check for rust staining or pitting.

Corrective Action

Replace with stainless steel (A4 grade for marine/coastal environments) or a correctly galvanized equivalent as specified for the application.

Cross-Threading or Joint Failure on Installation

Likely Cause

A metric bolt was installed into an imperial-threaded hole, or vice versa.

Diagnostic Steps

Verify thread pitch and type on both the fastener and the mating hole before forcing engagement; check for visible thread damage if cross-threading has already occurred.

Corrective Action

Replace with the correctly matched thread type and repair or re-tap the mating thread if it has been damaged by cross-threading.

Frangible Assembly No Longer Breaks Away as Designed

Likely Cause

A shear pin has been replaced with a standard bolt, removing the intended breakaway function.

Diagnostic Steps

Inspect the fastener used in any frangible coupling or mount for the correct part number and material against the specified frangible fastener kit.

Corrective Action

Replace with the correct, specified frangible shear pin immediately — this is a safety-critical correction, not a routine maintenance item.

Reliability

Failure Modes & Root Causes

Galling / Cold-Welding of Stainless Threads

Medium Severity

Root Cause

Stainless steel fastener tightened without anti-seize lubrication, aggravated by humid conditions and the naturally high friction coefficient of stainless-on-stainless threads.

Effect

Threads cold-weld under torque, seizing the fastener so it cannot be removed without damaging the joint, and often snapping the head or shank on the attempt.

Detection Method

Difficulty or excessive resistance felt during installation or removal, and visual inspection of thread surface finish for galling marks on removed fasteners.

Vibration-Induced Loosening

High Severity

Root Cause

Sustained vibration from aircraft and ground vehicle traffic gradually backs the fastener off its preload, especially where thread-locking adhesive or lock/Belleville washers were omitted.

Effect

Loss of clamping force leads to a loose or missing fastener, which accelerates fatigue on the remaining fasteners in the joint and can allow fixture movement or a lost electrical bond.

Detection Method

Torque/preload check during scheduled inspection, and a visual sweep for missing or backed-out fasteners on the fixture.

Over-Torque Failure

Medium Severity

Root Cause

Uncalibrated tool or installer error exceeds the fastener's specified torque value during installation.

Effect

Stripped threads, a broken bolt shank, or a cracked fixture housing, resulting in an immediately failed or compromised joint.

Detection Method

Visual inspection of the fastener and mating threads/housing for stripping or cracking, and a torque-tool calibration check.

Corrosion / Rust from Incorrect Fastener Material

Medium Severity

Root Cause

Uncoated or inadequately protected carbon-steel fastener used in an outdoor application instead of stainless steel or a correctly galvanized equivalent.

Effect

Rust staining and pitting develop over time, weakening the fastener and eventually causing it to seize in place.

Detection Method

Visual inspection for rust staining or pitting, and verification of fastener material/finish against specification during maintenance.

Cross-Threading from Thread Mismatch

Low Severity

Root Cause

A metric fastener installed into an imperial-threaded hole, or vice versa, forcing incompatible thread pitches together.

Effect

Thread damage on the fastener and/or the mating hole, preventing proper preload and risking joint failure.

Detection Method

Thread pitch and type verification before installation, and visual inspection for damaged threads if cross-threading is suspected.

Frangible Shear Pin Substitution

High Severity

Root Cause

A frangible coupling's shear pin was replaced with a standard, non-frangible bolt during a prior repair.

Effect

Breakaway function is removed entirely, so the fixture or pole will not shear on aircraft impact as intended, posing a severe safety risk.

Detection Method

Inspection of the fastener part number and material in any frangible coupling or mount against the specified frangible fastener kit.

Grade / Material Mismatch on Replacement

Low Severity

Root Cause

A replacement fastener of a different strength grade or a dissimilar metal was fitted during field maintenance instead of the original specification.

Effect

Introduces a weaker point in the joint or a galvanic corrosion risk at the dissimilar-metal interface.

Detection Method

Annual grade and material match verification of replaced fasteners against the original specification.

Precautions

Safety & Operational Notes

Verify Isolation Before Removing Fasteners

Electrical Safety

Where a fastener forms part of the bonding/earth path or sits close to a live series-circuit connection, de-energise and lock out the circuit and verify zero energy before loosening it.

Correct Grade & Torque

Mechanical

Use the specified grade, size, and torque for each application; under-torquing lets vibration back the fastener out over time, while over-torquing can crack a housing, strip threads, or distort an optical seal.

Preserve the Bonding Path

Electrical Safety

Where a fastener is the intended electrical bonding connection between a fixture and earth, clean mating surfaces and torque correctly; a loose or corroded fastener here is a safety fault, not just a mechanical one.

Corrosion-Resistant Replacement

Compliance

Replace like-for-like with the specified corrosion-resistant grade (stainless A2/A4, brass, or coated carbon steel); a substitute fastener that corrodes prematurely can compromise structural integrity or the seal it maintains.

FOD Control

Operational

Account for every fastener removed during disassembly, and confirm none are left loose in a housing or on the movement area before closing out the work.

PPE

Personnel Safety

Use insulated tools near any live circuit, and eye protection when using anti-seize compounds or when a fastener is under spring tension.

Field Insight

Engineering & Expert Notes

By Rahul Sharma

Airfield Ground Lighting Specialist

Galvanic Mismatch Is the Most Common Root Cause of Premature Fastener Failure

Corrosion

Mixing stainless fasteners with aluminium or galvanised components (or vice versa) without proper isolation sets up galvanic corrosion that's often mistaken for simple weathering. Verify material compatibility, or use isolating washers, whenever mixed materials are unavoidable.

Re-Torque Critical Fasteners After the First Thermal Cycle

Torque

Newly installed fasteners on fixtures exposed to significant day/night or seasonal temperature swings can loosen slightly as materials settle through their first full thermal cycle. Build a follow-up torque check into the commissioning schedule rather than treating initial torque as final.

Bonding Path Fasteners Need Continuity Verification, Not Just Mechanical Tightness

Electrical

A fastener that forms part of a bonding/earthing path can be mechanically tight while still providing poor electrical continuity if paint, anodising, or coating wasn't properly cleared at the contact point. Test continuity with a meter on bonding-critical fasteners specifically.

Vibration-Rated Fasteners or Locking Features Aren't Optional Upgrades

Vibration

Standard fasteners without thread-locking features or vibration-resistant design can back out gradually under continuous aircraft-induced vibration even at correct installation torque; specify the vibration-rated option for any fastener in a location with sustained mechanical vibration.

Coating Damage During Installation Creates a Corrosion Starting Point

Chemical Exposure

A fastener's corrosion-resistant coating can be scratched or damaged by an incorrect tool or over-torquing during installation, creating a localised starting point for corrosion that spreads faster than uniform surface wear would suggest. Use correctly sized tools and torque to spec, not by feel.

Record Actual Installed Fastener Grade Against Design Specification

Documentation

Field substitutions between the specified fastener grade and what's actually available or installed happen more often than records reflect; confirming and documenting installed grade prevents a mismatch being discovered only during a failure investigation.

Quick Answers

Frequently Asked Questions

Short answers about AGL fasteners: materials, torque, standards, maintenance and common problems.

Q1What fasteners are used in AGL fixtures?

Screws, bolts, nuts, washers, studs and rivets, used for fixture assembly, mounting to base plates and base cans, terminal and earthing connections, junction box covers and cable glands, and CCR and control panels.

Q2What materials are used for AGL fasteners?

Typically stainless steel (A2 or A4), brass, zinc-plated carbon steel or titanium, chosen for resistance to de-icing fluids, jet fuel and hydraulic fluids. Strength grades include A4-70 for stainless and 8.8, 10.9 or 12.9 for carbon steel.

Q3Why is correct torque important for AGL fasteners?

Over-torquing can strip threads, break the fastener or crack housings, while under-torquing lets the joint loosen under vibration. Torque range depends on fastener size and material, typically 2 to 50 Nm.

Q4How do you stop AGL fasteners loosening or seizing?

Use anti-seize compound to prevent galling and corrosion, and thread-locking adhesive where vibration is a concern. Washers spread the load and maintain clamp force through thermal cycling.

Q5Why do stainless steel fasteners seize?

Stainless steel can gall, a form of cold welding, when tightened without lubricant. Anti-seize compound and the correct torque reduce the risk.

Q6Which standards apply to AGL fasteners?

The main references are ISO 898-1 (carbon and alloy steel fasteners), ISO 3506-1 (stainless steel fasteners) and the fastener requirements in the fixture specification, FAA AC 150/5345-46.

Q7How often should AGL fasteners be checked?

Annually. Re-torque to the specified value, inspect stainless fasteners for rust bleed or galvanic corrosion, and check threads for galling or stripping, especially on fasteners that are removed often.

Q8Can metric and imperial fasteners be mixed?

No. Mixing them causes cross-threading and damage. Match the thread type (metric M3 to M12, or UNC/UNF) to the tapped hole.

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Important Notice, Disclaimer & Limitation of Liability

Please read before relying on any content on this page.

Specific to this type of equipment: The lights, fixtures and parts on this page operate on energised series or constant-current circuits and can be hot, high-voltage or high-intensity. Isolate, lock out and prove dead under the aerodrome’s procedure before any work. Photometric, intensity, colour, spacing and fixture-type statements are typical and general; the approved lighting design, the regulator’s requirements and the manufacturer’s data decide what is installed, how it is set and when it may be used. Nothing here authorises a change to any lighting configuration, intensity setting, category or NOTAM.

Purpose and intended users. This page on Fasteners is an independent educational and informational reference for competent, suitably trained and authorised airfield ground lighting (AGL) and aerodrome electrical personnel. It is not professional engineering, legal or regulatory advice, and using it does not create any professional or client relationship.
Safety. Work on series circuits, constant current regulators (CCRs), isolating transformers, cables, connectors and lighting equipment can be fatal. Always apply the aerodrome’s permit-to-work and isolation/LOTO procedures, prove dead, use correctly rated instruments and PPE, and follow the manufacturer’s instructions. Nothing here authorises work on live equipment or the bypassing of any safety device or interlock.
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