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
Quick-reference O-ring and seal lookup aid. Verify exact size, material, and part number in approved maintenance data.
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Tire Pressure Log
Printable tire pressure worksheet for daily and periodic checks. Use with the current AMM and operator procedures.
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Inspection Checklist
Printable inspection worksheet templates for line and general aviation work. Not a substitute for approved inspection programs.
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🛒 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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GEARWRENCH 12 Pc Flex Head Ratcheting Wrench Set
12-point XL locking flex head ratcheting combination wrenches. A personal wrench set every AMT should own — companies don't supply these.
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Sunex 11-Pc Stubby Combination Wrench Set
SAE stubby wrenches from 3/8" to 15/16". Short handles are essential for tight spaces in wheel wells, engine bays, and panels.
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Milwaukee M12 FUEL 3/8" Extended Reach Ratchet
35 ft-lbs max torque with an extended reach head — perfect for tight aircraft spaces. One of the best personal ratchets an AMT can own.
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Help Us Build Better Tools
We appreciate your feedback in making this website valuable for all mechanics. Tell us what tools, charts, or references you'd like to see added — this site is built for AMTs, by AMTs.
📰 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 →