This collection presents 39 Tools that start with O, spanning from “O-ring pick” to “Oxy-fuel cutting torch”. They include small hand items, measuring aids, and powered devices for repair, fabrication and measurement tasks.

Tools that start with O are handheld, powered, measurement or digital instruments whose common names begin with the letter O. Many reflect trade traditions and language, such as the longstanding use of oxy-fuel cutting torches in metalworking.

Below you’ll find the table with Name, Purpose, Primary materials, and Typical users.

Name: The tool’s common name as used in catalogs, labels and searches so you can identify it quickly.

Purpose: Short description of what the tool does, helping you decide whether it fits your task or project.

Primary materials: Typical materials and construction, so you know durability and suitability for common jobs.

Typical users: Common user groups like DIYers, tradespeople or students, to help you judge who usually uses each tool.

Tools that start with O

Name Tool type Primary material(s) Typical users Description
Open-end wrench hand tool steel mechanic, plumber, DIYer Fixed U-shaped jaw wrench for loosening or tightening nuts and bolts; common basic wrench style with metric and imperial sizes.
Offset wrench hand tool steel mechanic, plumber, electrician, DIYer Wrench with an offset head to clear obstructions and provide better hand clearance for tight fasteners.
Offset screwdriver hand tool steel, plastic handle electrician, mechanic, DIYer Screwdriver with a bent shaft or head to reach screws in tight or angled spaces.
One-handed clamp hand tool steel, plastic woodworker, DIYer, maker Quick-action bar clamp that can be tightened with one hand for holding pieces during gluing or assembly.
One-way screwdriver hand tool steel locksmith, mechanic, security installers Specialized driver for installing or removing one-way security screws found on public fixtures and safety devices.
Oscillating multi-tool power tool steel, plastic carpenter, remodeler, DIYer Versatile power tool with interchangeable blades for cutting, sanding, scraping, and grout removal in tight spots.
Oscillating sander power tool plastic, metal woodworker, finisher, DIYer Compact sander that cuts in short oscillating motions for detail sanding and edges.
Oscillating saw power tool steel, plastic contractor, renovator, DIYer Multi-purpose saw for plunge cuts, drywall, trim, and cutting pipes using oscillating blades.
Orbital sander power tool plastic, aluminum, steel woodworker, auto-detailer, DIYer Random-orbit sanding action for finishing wood, paint and smoothing surfaces without visible swirl marks.
Orbital polisher power tool plastic, aluminum auto-detailer, woodworker, DIYer Low-speed polisher for buffing finishes on cars, boats, and wood surfaces; often used with pads and compounds.
Oilstone hand tool abrasive stone woodworker, machinist, knife maker, DIYer Flat sharpening stone soaked or used with oil to hone and sharpen blades and cutting tools.
Oiler hand tool metal, plastic mechanic, machinist, woodworker Small oil dispenser (oilcan or oil pen) for lubricating machinery, tools and precision assemblies.
Oil can hand tool steel mechanic, machinist, hobbyist Classic sprung-spout lubricant can for applying small amounts of oil to moving parts.
Oil extractor accessory plastic, metal mechanic, DIYer Pump or vacuum tool used to remove engine or gearbox oil without dropping the drain plug.
Oil filter wrench hand tool steel, rubber mechanic, DIYer Tool that grips and turns oil filters for removal and installation; comes in band, chain, and socket styles.
Oil filter pliers hand tool steel, rubber mechanic, DIYer Pliers with wide jaws or teeth designed to grip and twist oil filters in confined spaces.
Oil filter socket accessory steel mechanic, DIYer Sockets sized to fit oil filter end caps for removal with a ratchet or breaker bar.
Oil drain pan accessory steel, plastic mechanic, DIYer Shallow pan used to collect oil during changes; often has spout and capacity markings.
Oil pump tool steel, plastic mechanic, technician Hand or powered pump used to transfer or dispense oil during maintenance and hydraulic functions.
Oil pressure gauge measuring tool steel, glass mechanic, technician Instrument to measure engine oil pressure for diagnostics and maintenance checks.
Oil dipstick measuring tool steel mechanic, DIYer Simple, graduated metal rod for checking engine oil level and basic oil condition.
Oxy-acetylene torch power tool steel, brass welder, metalworker, plumber High-temperature torch used for welding, brazing and cutting metal with oxygen and acetylene gas.
Oxy-fuel cutting torch power tool steel, brass metalworker, fabricator, welder Torch set outfitted for cutting metal using an oxygen jet and fuel gas; common in metal fabrication.
Oscilloscope instrument electronic, plastic engineer, technician, hobbyist Electronic test instrument that displays and measures voltage waveforms and signals over time.
Oscilloscope probe accessory metal, plastic engineer, technician Precision probe for connecting signals to an oscilloscope while preserving bandwidth and signal integrity.
Optical comparator instrument glass, metal machinist, inspector, toolmaker Shadowgraph measuring device that projects a magnified silhouette of parts for dimensional inspection and profile comparison.
Optical microscope instrument glass, metal, plastic jeweler, biologist, maker Magnification instrument for close inspection of small parts, materials, and biological samples.
Optical level instrument glass, metal surveyor, builder, landscaper Precision leveling instrument used in surveying and construction to establish horizontal planes.
Optical tachometer measuring tool plastic, electronic mechanic, machinist Non-contact device that uses light to measure rotational speed (RPM) of shafts and motors.
Optical fiber stripper hand tool steel, plastic telecom tech, electrician Tool for precisely removing protective coatings from optical fibers without nicking the glass core.
Outside caliper measuring tool steel machinist, metalworker, woodworker Caliper used to measure outside dimensions or transfer measurements between work and measuring tools.
Outside micrometer measuring tool steel machinist, engineer Precision micrometer designed to measure external dimensions with high accuracy.
Outlet tester measuring tool plastic, electronic electrician, DIYer Simple plug-in tester that checks wiring faults, polarity and basic ground connections in electrical outlets.
O-ring pick hand tool steel, plastic mechanic, plumber, HVAC tech Small hooked picks for removing and installing O-rings, seals and small gaskets without damage.
O-ring pliers hand tool steel mechanic, plumber, HVAC tech Pliers designed to spread or hold O-rings for easier installation in tight grooves.
Oval file hand tool steel metalworker, machinist, jeweler File with an oval cross-section used for shaping internal curves and smoothing rounded slots.
On-camera light accessory plastic, aluminum, LED content creator, videographer, photographer Compact LED light that mounts on a camera to provide consistent on-axis illumination for video and photos.
On-camera microphone accessory metal, plastic content creator, videographer Directional mic that mounts on a camera to capture clearer audio in run-and-gun filming.
Overhead projector instrument glass, plastic teacher, presenter, maker Projection device that displays transparencies onto a screen; still used for demonstrations and craft tracing.

Descriptions

Open-end wrench
Offset wrench
Offset screwdriver
One-handed clamp
One-way screwdriver
Oscillating multi-tool
Oscillating sander
Oscillating saw
Orbital sander
Orbital polisher
Oilstone
Oiler
Oil can
Oil extractor
Oil filter wrench
Oil filter pliers
Oil filter socket
Oil drain pan
Oil pump
Oil pressure gauge
Oil dipstick
Oxy-acetylene torch
Oxy-fuel cutting torch
Oscilloscope
Oscilloscope probe
Optical comparator
Optical microscope
Optical level
Optical tachometer
Optical fiber stripper
Outside caliper
Outside micrometer
Outlet tester
O-ring pick
O-ring pliers
Oval file
On-camera light
On-camera microphone
Overhead projector
If you think there is a missing term, let us know using the contact form.