An extremely strong precipitation hardened stainless steel
- Well suited for high strength applciaitons
- Up to 4x stronger than 316 stainless steel
- Maintains its mechanical strength up to 600°F
- 17-4PH Chemistry & Specifications
- 17-4PH flat head screw features and benefits
17-4 PH flat head 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 flat head 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 screws are available in 8 different aged (precipitation hardened) conditions offering a variety of mechanical properties (see below).
Resources: 17-4PH Torque Specs
17-4PH flat head screws are characterized by having a head with a top flat surface (which can feature either a slotted, phillips or allen driver) and bottom that is cone shaped or countersunk. With this design, the head of the screw can align flush or below the surrounding surface having obvious benefits.
17-4PH Slotted vs. Phillips Driver
|Slotted Head Advantages||Phillips Head Advantages|
For most flat head screw designs the angle of countersink is usually 82° for UNC and UNF applications however other angles ranging from 60° -120° could be specified.
|Thread Type||Normal Flat Head Countersink Angle|
UNC / UNF
|ISO Metric / Imperial||90°|
17-4PH Specifications: UNS S17400, AISI 630, ASTM A564-630, AMS 5604 Sheet, Strip and Plate ASTM A 693 Plate