From all the precipitation hardened stainless steel grades, martensitic stainless steel 17-4 PH is one of the most widely utilized alloys. The 17-4 Ph Set Screws has added niobium, which not only stabilises carbon but also strengthens the alloy for high temperature applications. This stainless steel is an alloy grade that combines attractive properties such as its high tensile strength along with hardness and corrosion resistance properties as well.

17-4 PH Fasteners

17-4 PH Fasteners

In fact, the 17-4 PH Fasteners maintain their superior hardness to a temperature of about 572°F. Its mechanical properties can be optimized by treating the alloy to heat. For instance, the 17-4 Ph Nuts exhibits very high yield strength which ranges between a value of 1100-1300 MPa. As proof of its high mechanical strength, the 17-4 Ph Stainless Steel Fasteners are able to demonstrate being used at elevated temperatures up to 600°F in applications involving Aerospace applications, General metalworking, Chemical processing equipment, Food processing equipment as well as Oil and petroleum refining equipment.


The 17-4 Ph Stainless Steel Bolts are well suited to be used in those applications where an amalgamation of moderate corrosion resistance and unusually high strength are contemplated to be relevant. Because the alloy has a valued set of properties, designers are able to simplify fabrication processes, thus reducing costs and proving to be a cost saving alternative, especially if compared to high nickel non-ferrous alloy grades. While the corrosion resistance of Alloy grade 17-4PH Stainless Steel Hex Head Screw is often compared to grade 304 stainless steel in most conditions, the corrosion resistance is however generally superior to the 400 series stainless steel grades.

17-4 Ph Stainless Steel Bolts specification and grades

Lengths From 3 upto 200 Millimetre
Standard ASTM A479/ ASME SA479
In Form of: Round, Threading, Hex, Square as per Gauge Etc.
Sizing 3/6 inch upto 2 inch | M3 – M56

Dimensions of 17-4 Ph Screws

Dimensions of 17-4 Ph Screws

Nominal Thread. Hex Socket Size Body diameter and Head height Head Dia Soc. length
Size Pitch Max Min Max Min
J D /H A K
M24 3.0 19.00 24.00 23.67 36.00 35.38 12.90
M3 0.5 2.50 3.00 2.86 5.50 5.20 1.3
M5 0.8 4.00 5.00 4.82 8.50 8.14 2.70
M6 1.0 5.00 6.00 5.82 10.00 9.64 3.30
M4 0.70 3.00 4.00 3.82 7.00 6.64 2.00
M8 1.25 6.00 8.00 7.78 13.00 12.57 4.3
M20 2.5 17.00 20.00 19.67 30.00 29.48 10.70
M12 1.75 10.00 12.00 11.73 18.00 17.57 6.60
M10 1.5 8.00 10.00 9.78 16.00 15.57 5.50
M16 2.0 14.00 16.00 15.73 24.00 23.48 8.80

17-4 Ph Nuts Chemical Material Composition

Product C Mn Si P S Cr Ta Ni Nb Cu
17-4 PH min. max. - 0.070 - 1.0 - 1 - 0.040 - 0.030 15.0 17.5 - 0.45 3 5 - 0.45 3 5

Mechanical Behaviour of 17-4PH Stainless Steel Hex Head Screw

Grade Shear modulus (GPa) min Poisson's Ratio Thermal expansion co-efficient (@ 21-93°C/69.8-199°F) Hardness
Rockwell C (HR C) max Brinell (HB)
max
17-4 PH 77.4 GPa 0.27-0.30
10.8 µm/m°C

363 352

17-4 PH Fasteners Equivalent grades

AISI Grade Equivalent
ASTM
JIS Equivalent
Stainless Steel Notation
EN/DIN Numerical Equivalent
UNS
designation
EN/DIN Symbolical Equivalent
17-4 PH
A479
SUS 17-4 PH
SS 17-4 PH
EN 1.4542
UNS S17400
X5CrNiMo1713

Physical Properties of 17-4 PH Stainless Steel Washer

Material Density (g/cm3) Elastic Modulus (GPa)
17-4 PH 7.75 190-210