An extremely strong precipitation hardened stainless steel12 Point

17-4 PH 12 point screws are made from a precipitation hardened stainless steel most known for its exceptional strength and its ability to maintain its mechanical properties to 600°F. Compared to 316 stainless steel, 17-4 PH screws yield strength is up over 4 times greater. When compared to Duplex 2205 screws, the yield strength of 17-4 PH can be up to 2-½ times greater.

17-4 12 point screws are available in 8 different aged (precipitation hardened) conditions offering a variety of mechanical properties (see below). 

Resources: 17-4PH Torque Specs

17-4 PH Screw Types: 12 Point ScrewsButton Head Cap ScrewsFlat Head ScrewsHex Cap ScrewsPan Head ScrewsSet ScrewsSocket Head Cap ScrewsTorx Screws

 

 


17-4PH 12-Point Screw Features & Benefits

The driver of a 17-4PH 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, 17-4PH 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. 

 


17-4PH Chemistry & Specifications

17-4 PH Specifications: UNS S17400, AISI 630, ASTM A564-630, AMS 5604 Sheet, Strip and Plate ASTM A 693 Plate

17 4 PH Chemistry


Common 17-4 Fastener:  Aged Conditions vs Tensile Strength

Tensiled Data vs Aged Condition

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