Socket cap screws, also known as Allen head screws, have a recessed drive and are commonly used when there is not enough clearance for a conventional wrench or socket. They are durable and used in many industrial applications.

The black oxide coating provides some lubricity to the product, meaning that there is less friction generated when using these products. The coating also provides a mild corrosion resistance but should not be relied on in environments where corrosion resistance is a primary concern. Alloy steel is steel that has been alloyed with other materials to improve overall physical properties. Steels are designated by a four-number SAE Steel grade. The first two digits indicate the primary materials used to form the steel. The last two digits identify the percentage of carbon for the alloy (in hundredths). Tensile strength ranges for the alloys typically used in these fasteners range from 170,000 to 180,000 psi (pounds per square inch), making these amongst the strongest of materials.

With a high cylindrical head, socket cap head fasteners offer high holding power at high torque levels. Hex socket drive systems are driven by hex wrenches or power tools with hexagonal bits.

A threaded fastener's size name includes information about the major external diameter, followed by the threads per inch, which indicates if it is coarse or fine.

The Apollo 75-100 series two-piece inline ball valve is made of bronze and has a lockable lever-handle and female National Pipe Taper (NPT) threaded connections on both ends. This valve is made of bronze for higher strength and corrosion resistance than brass. This valve has a zinc-plated steel, lockable lever handle that can be locked in the open or closed position using a portable lock (not included). The maximum pressure is 600 pounds per square inch (gauge) (psig) for use with water, oil, and gas (WOG) and 150 for saturated steam. The valve is inline for connecting two pipes going in the same direction and has NPT threads on both ends for creating tighter seals than straight threads. Reinforced polytetrafluoroethylene (RPTFE) seats and a PTFE seal reduce the risk of valve leakage. This ball valve is standard (or regular) port for reduced valve size and cost and has a working temperature range of -20 to 450 degrees Fahrenheit. This valve is for use in water lines, processing plants, and agricultural applications and meets standard MSS SP-110 for quality assurance.

Ball valves use a spherical disc to control the flow between pipes, tubes, or hoses. Flow is allowed when the hole that pierces the ball-shaped disc is in line with the inlet and outlet of the valve. Flow is blocked when the ball is horizontally swiveled 90 degrees, so that the hole of the ball is perpendicular to the opening of the valve. Ball valves can be referred to as full port or reduced port (also known as regular or standard port) depending on the inner diameter of the valve. A ball valve is full port if the hole of the ball is the same size as the inner diameter of the connecting pipeline (resulting in lower friction) and is reduced port if the hole of the valve is one pipe size smaller than the pipe, resulting in less flow through the valve than through the shaft of the pipe. Ball valves may have a handle or lever that aligns with the ball’s position (open or closed) for manual operation. They are primarily used in air, gas, liquid, and steam applications.

Apollo manufactures ball, mixing, and relief valves, actuators, water gauges, marine fittings, heating and plumbing products, and backflow prevention devices. The company, founded in 1928 and headquartered in Matthews, NC, meets International Organization for Standardization ISO/IEC 17025:2005 and makes products that meet ISO and American National Standards Institute (ANSI) standards.