GENERAL TYPES OF MATERIAL USED AND TESTED BY DELIA TACTICAL INTERNATIONAL PRODUCTS GROUP
Alloy steel contains elements other than carbon, such as chromium, manganese, etc. Alloy steels have a higher tensile strength, corrosion and oxidation resistance and ductility than carbon steel does.
Carbon steel is steel in its basic form, primarily consisting of iron and carbon. Carbon steel makes up the majority of steel produced and is common in almost every industry because of its high strength, although, it has a low resistance to corrosion. Both the Brahma ATR and the Raptor Rescue Tool uses elements of carbon steel in several tool accessories and applications.
Cold rolled steel is steel that has been shaped without the application of heat. Cold steel has a smooth surface texture and is common in objects needing strength. The Raptor Rescue Tool handle is manufactured with 1'' cold rolled steel and must be formed and bent with a 20+ ton press. The Brahma ATR and the Raider tool also uses cold rolled steel in the handle design.
Plate steel is steel that has been flat rolled, as opposed to steel in section form, and maintains a certain amount of thickness that is based on plate width. Plate steel is used in the production of the Brahma ATR and the Raptor Rescue Tool.
Stainless steel, also referred to as "chromium steel," is the most common type of steel manufactured by steel service centers. This corrosion resistant material is preferred in the food and medical industries.
Structural steel, also referred to as "plate steel," is low carbon steel containing manganese, which is commonly used in the engineering and construction industry for the production of buildings, bridges, and transportation equipment. Structural steel has been hot rolled, often has a rough surface texture and includes steel beams.
Polyurethane, commonly abbreviated PU, is any polymer consisting of a chain of organic units joined by urethane (carbonate) links. Polyurethane polymers are formed by reacting a monomer containing at least two isocyanate functional groups with another monomer containing at least two alcohol groups in the presence of a catalyst.
The term hardened steel is often used for a medium or high carbon steel that has been given the heat treatments of quenching followed by tempering. The quenching results in the formation of metastable Martensite, the fraction of which is reduced to the desired amount during tempering. This is the most common state for finished articles such as tools and machine parts. In contrast, the same steel composition in annealed state will be softer as required for forming and machining.
Polyurethane formulations cover an extremely wide range of stiffness, hardness, and densities.
Polyurethane's are widely used in high resiliency flexible foam seating, rigid foam insulation panels, microcellular foam seals and gaskets, durable elastomeric wheels and tires, automotive suspension bushings, electrical potting compounds, high performance adhesives and sealants, Spandex fibres, seals, gaskets, carpet underlay, and hard plastic parts.
Polyurethane products are often called "urethanes". They should not be confused with the specific substance urethane, also known as ethyl carbonate. Polyurethane's are not produced from ethyl carbonate, nor do they contain it.
Ballistic nylon is a thick, tough, synthetic nylon fabric used for a variety of applications. Ballistic nylon was originally developed by the DuPont Corporation as a material for flak jackets to be worn by World War II airmen. The term ballistic nylon takes its name from the fact that it was intended to protect its wearers from flying debris and fragmentation caused by bullet or artillery shell impacts. It was not an effective defense against most pistol or rifle rounds. Ballistic nylon was succeeded by Kevlar and other, more effective, bullet resistant fabrics. Modern applications of ballistic nylon include luggage, cave packs, tool belts, police duty belts, motorcycle jackets, and skin-on-frame kayaks.
Ballistic nylon is of a heavier weight than most nylons used in manufacturing: 18 oz. (1050 denier). Denier refers to the weight, not the strength, of the fabric. Laboratory tests have been run and the 1050 denier fabric is the strongest and most durable fabric for its denier weight level. The 1680 denier looks very similar to the 1050 when it is new, but it is actually not as strong as 1050 denier and gets fuzzy as it wears. As it resists abrasion and tearing, ballistic nylon is typically used for luggage and in the bottom of bags made of a lighter nylon or other fabric. Ballistic nylon is hard to dye, so it is often found in black or similar dark colors.
Velcro is a brand name of fabric hook-and-loop fasteners. It consists of two layers: a "hook" side, which is a piece of fabric covered with tiny hooks, and a "loop" side, which is covered with even smaller and "hairier" loops. When the two sides are pressed together, the hooks catch in the loops and hold the pieces together. When the layers are separated, the strips make a characteristic "ripping" sound.
Velcro is surprisingly strong. A two inch square piece of Velcro is enough to support a 175 pounds person. The strength of the bond depends on how well the hooks are embedded in the loops, how much surface area is in contact with the hooks, and the nature of the force pulling it apart. If Velcro is used to bond two rigid surfaces, e.g., auto body panels and frame, the bond is particularly strong because any force pulling the pieces apart is spread evenly across all hooks. Also, any force pushing the pieces together is disproportionately applied to engaging more hooks and loops. Vibration can cause rigid pieces to improve their bond. Full-body hook and loop suits have been made that can hold a person to a suitably covered wall.
When one or both of the pieces is flexible, e.g., a pocket flap, the pieces can be pulled apart with a peeling action that applies the force to relatively few hooks at a time. If a flexible piece is pulled in a direction parallel to the plane of the Velcro surface, then the force is spread evenly as it is with rigid pieces.
Three ways to maximize the strength of a bond between the two flexible pieces are:
1. Increase the area of the bond, e.g. using larger pieces of Velcro .
2. Ensure that the force is applied parallel to the plane of the fastener surface, e.g., bending around a corner or pulley.
3. Increase the number of hooks and loops per area unit.
A hex key, also known as an Allen, zeta, or Unbrako key or wrench, is a tool of hexagonal cross-section used to drive bolts and screws that have a hexagonal socket in the head (internal-wrenching hexagon drive). The name zeta refers to the fact that zeta is the sixth letter of the Greek alphabet. The term hex-head is sometimes used to refer to this type of drive, but this use is not consistent with its more conventional use referring to external-wrenching hexagons. In the fastener industry, the terms socket head or hex socket head are generally used for the driven part of the driver-driven pair.
Some features of hex keys are:
The tool is simple, small and light.
The contact surfaces of the screw or bolt are protected from external damage.
The tool can be used with a headless screw.
The screw can be inserted into its hole using the key.
There are six contact surfaces between bolt and driver.
Torque is constrained by the length and thickness of the key.
Very small bolt heads can be accommodated.
Either end of the tool can be used to take advantage of reach or torque.
For more information contact Delia Tactical International at Info@Deliatactical.com