Mechanical standards

standard size of paper

permissible limit(s) of variation in an engineered component or system

standardized frame or enclosure for mounting multiple equipment modules

lightbulb socket that uses a threaded metal base

standard firearm mounting platform

type of mechanical fastening mechanism

thumb|EUR-pallets

unit of measure describing the height of electronic equipment designed to mount in a 19-inch rack or a 23-inch rack

International standard for mounting equipment

flexible pad held over the nose and mouth by elastic or rubber straps to protect against dust

REDIRECT Barrel shroud#Handguard

paper size

industrial-grade containers for transport and storage of liquids, semi-solids, pastes, or solids

type of power plugs standardized by the National Electrical Manufacturers Association

lightbulb socket

Wikipedia list article

North American set of standard sizes for pipes

family of standards defined for mounting flat panel displays

Rail interface system for firearms, based on the Picatinny rail

square-shaped screw drive

Term for various standards for attachment of firearm accessories

gearwheel with teeth projecting radially

Several types of sliding brackets found on firearms for mounting scope sights, often used on air guns.

grade of an industrial process defined in ISO 286, identifies what tolerances a given process can produce for a given dimension

ISO standard

thumb|Magpul MOE M-LOK handguard on a user-assembled AR-15 style rifle|AR-15 semi-automatic rifle M-LOK, for Modular Lock, is a firearm rail interface system developed and patented by Magpul Industries. The license is free-of-charge, but subject to an approval process.