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Metric 12 Point Flange Head Cap Screws Stainless Steel
12 point screws are used in applications where the screws have to be driven hard and tight. The grip on the head is maximized through the shape. Viha Steel & Forging is a leading manufacturer and supplier of the different 12 point screws stainless steel in different grades. The head of the screw has twelve points as an overlap of two hexagons. The screws also have a flanged underside. The stainless steel 12 point flange screw is also called the ferry cap screws. The point sizes range from ¼ inches to 4 inches and M6 to M100. There are different specifications to cover different sets of applications such as IFL-115, MIL SPEC, DIN 34822 and DIN 34821. The metric 12 point screws have great torque capacities that exceed the socket head screws and the cap screws. The head of these screws is small compared to hex head screws. Therefore these 12 point cap screws are used in tight space applications where the space and weight are critical.
These screws also lack the recess that traps debris and fluid. The 12 point head screws can come in different types and grades. The most used grades for production are the 304 and 316 austenitic stainless steel grades.
This is due to the cost effectiveness, corrosion resistance and strength of the material grades. The 12 point socket screws have a socket shaped head can harbor the screw driver with 12 points. The application of these types of screws can be seen in the petroleum, petrochemical, automotive, engine part, exhaust and other high vibration, high temperature and high pressure systems. As a leading alloy steel 12-point screws manufacturer, we produce these screws in large quantities and we can cater any order size with ease. Please feel free to contact us for more information on the different types such as the 12 point metric cap screws and their prices.
Typically, a 12-point bolt would be seen in the oil and gas industry because of the recessing head of the bolt. This will not be seen when they’re clamping together the end bolts. 12-point bolts are also prevalent in engine applications. Clamp load for engine applications are typically higher than most others, which a 12-point will help deliver.
Specification
All sizes of 12-point flange bolts have a minimum tensile strength of 170,000 psi, a minimum Rockwell hardness of C37, and a Class 3A thread fit. ASTM A387 Grade 9 is categorized as alloy steel.
The driver of a 12-point screw uses two overlapped hexagon shapes, creating 12-points and a flanged underside. These are also referred to as ferry cap screws or 12 point flange screws. The advantages of this head style include:
- Higher torque capability compared to a socket head cap screw
- Lack of recess to trap fluid or debris.
- As the heads are generally smaller than a hex, 12-point screws are often used situations where installation space is tight and saving weight is critical.
The overall disadvantage is the extra cost involved in forming the heads.
The Controversy of 6 vs. 12 point Bolts
There is much debate over which bolt is better. Some say that the more points a nut or bolt has – such as a 12-point bolt - the less chance you have to round it off. And that the additional contact points of a 12 point screw give you more surface to apply load. While the jury is out as to the accuracy of this, it’s the application that should dictate whether the benefits of a 12 point screw out weight the additional costs of making them.
12 Point Screw Sizes: #4 - 4" M3 - M100
12 Point Screw Materials
- 12 Point - 17-4 PH
- 12 Point - A286
- 12 Point - AL-6XN
- 12 Point - Alloy 20
- 12 Point - Alloy 330
- 12 Point - Duplex Steel
- 12 Point - Hastelloy
- 12 Point - Incoloy
- 12 Point - Inconel
- 12 Point - Monel
- 12 Point - MP35N
- 12 Point - Titanium
- 12 Point - Waspaloy