Drill Bit Size Chart for Aircraft Mechanics
A complete guide to number, letter, and fraction drill sizes — with decimal equivalents and how to choose the right drill for the job.
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✈ Aviation Maintenance Reference
AMT
Fast, mobile-friendly reference tools built for the hangar. Drill charts, torque conversions, ATA codes, safety wire guides, and more — all in one place, no login required.
⭐ Popular Tools
The most-used reference tools for day-to-day aviation maintenance work.
Drill Bit Size Chart
Complete number, letter, and fraction drill chart with decimal and metric equivalents. Searchable and sortable.
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Torque Converter
Instantly convert between in-lb, ft-lb, N·m, kg-cm, and kg-m. Essential for any torque wrench work.
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ATA Code Lookup
Search all standard ATA chapter codes with descriptions. Fast reference for work orders and maintenance logs.
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Unit Converter
Convert length, weight, pressure, temperature, and volume. Covers inches, mm, PSI, bar, °F, °C, and more.
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Safety Wire Size Guide
Quick reference for .020, .025, .032, and .041 safety wire with common applications and usage notes.
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Quick Reference Cards
Common conversions mechanics use daily — displayed as fast-read cards for hangar use.
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🛠 All Reference Tools
Every tool available on this site, organized for quick access.
Hardware Reference Chart
Bolt diameter, wrench size, thread types, and common aviation hardware usage notes.
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Rivet Size Reference
Common rivet sizes with diameter, required drill size, head type, and application notes.
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Wire Gauge Reference
AWG wire gauge chart with diameter, ampacity, and general aviation wiring use notes.
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O-Ring / Seal Reference Coming Soon
AN, MS, and dash-number o-ring and seal cross-reference chart.
Coming Soon
Tire Pressure Log Coming Soon
Printable tire pressure log template for daily and periodic checks.
Coming Soon
Inspection Checklist Coming Soon
Customizable inspection checklist templates for general aviation and line maintenance.
Coming Soon
🛒 Gear Mechanics Buy Themselves
Personal gear that aviation mechanics buy out of pocket — not shop-supplied. (Affiliate links — we may earn a small commission at no extra cost to you.)
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LED Penlight
Slim, bright penlight that fits in your chest pocket. Essential for inspecting tight bays, wheel wells, and confined spaces.
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LED Headlamp
Hands-free lighting for engine bays and overhead work. Rechargeable with a wide flood beam and a slim profile that fits under a headset.
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Telescoping Inspection Mirror
Extendable mirror for checking hard-to-see fasteners, safety wire direction, and hidden structure. A daily-use tool for any AMT.
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Mechanics Gloves
Cut-resistant, touchscreen-compatible gloves. Protects hands from sharp edges, hydraulic fluid, and safety wire pigtails.
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Tool Backpack / Bag
Heavy-duty personal tool bag for carrying your own tools to and from the aircraft. Organized pockets, padded shoulder straps.
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Borescope Camera
Flexible USB or WiFi borescope for inspecting engine bores, fuel tanks, and confined structure without disassembly.
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Mechanic Kneepads
Gel-padded kneepads for working on landing gear, belly panels, and floor-level components. Saves your knees on long jobs.
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Personal Logbook
Track your own work experience, endorsements, and training hours. Essential for career progression and certificate renewals.
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📰 Articles & Guides
In-depth guides for aircraft maintenance technicians. More articles coming soon.
Common ATA Codes Every Aviation Mechanic Should Know
A practical breakdown of the ATA 100 chapter system — what the codes mean and why they matter for work orders and documentation.
ATA Lookup →Torque Conversion Guide for Aviation Maintenance
When your torque spec is in ft-lb but your wrench reads N·m — here's how to convert quickly and accurately on the job.
Torque Converter →Safety Wire Size Selection Guide for AMTs
Choosing the right safety wire gauge for the application — from .020 on small screws to .041 on high-vibration fittings.
Safety Wire Guide →