17-4 PH Hex Cap Screws-RAYCHIN LIMITED

17-4 PH hex head cap 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 hex head cap 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 hex head cap screws are available in 8 different aged (precipitation hardened) conditions offering a variety of mechanical properties.

An extremely strong precipitation hardened stainless steel

Resources: 17-4PH Torque Specs

17-4 PH Screw Types: 12 Point Screws, Button Head Cap Screws, Flat Head Screws, Hex Cap Screws, Pan Head Screws, Set Screws, Socket Head Cap Screws, Tamper Resistant Security Screws, Torx Screws, Vented Screws

17-4 PH Hex Head Cap Screw Features and Benefits

It is important to differentiate between a 17-4 PH hex head cap screw and hex head bolt. Often people assume they are the same, but they are actually very different fasteners in terms of how they are manufactured, as well as from an application perspective. Regardless of your choice, 17-4 PH hex heads offer strong, stable joints because of their large head service.

The most important feature of a 17-4 PH hex head cap screws is that it has a larger bearing surface area which provide better clamping pressure than other type of fastener such as a socket head cap screw. Additionally, since debris build up is less of an issue with this style of fastener verses a socket head cap screw, they are ideal of dirty applications where particles could clog up a socket. Though 17-4 PH socket heads are typically used for tight access applications, hex heads can be a better choice when there is only side clearance available for tightening.

17-4PH Chemistry & Specifications

17-4PH Specifications: UNS S17400, AISI 630, ASTM A564-630, Werkstoff 1.4542, AMS 5604 Sheet, Strip and Plate, ASTM A 693 Plate

17-4PH	Fe	Cr	Ni	Cu	Mn	Si	Mo	Nb+Ta	C	P	S
Min%		15.0	3.0	3.0	-	-	-	-	-	-	-
Max%	Bal	17.5	5.0	5.0	1.0	1.0	0.50	0.45	0.07	0.04	0.03

ASTM F593, Grade 630

This specification covers seven groups of stainless steel alloys, with ASTM F593, Grade 630 applying 17-4PH. ASTM F593 Grade 630 covers the requirements for 17-4PH stainless steel bolts, hex cap screws, and studs sized 0.25 to 1.50 inches, inclusive, in nominal diameter. It is intended for common use and for service applications requiring general corrosion resistance.

				Full-Size Tests			Machined Specimen Tests
Stainless Steel Alloy Group	Condition	Alloy Mechanical Property Marking	Nominal Diameter (inches)	Tensile Strength (ksi)	Yield Strength (ksi)	Rockwell Hardness	Tensile Strength (ksi)	Yield Strength	Elongation %
7(630)	AH	F593U	1/4 to 1.5 IN	135 to 170	105	C28 to38	135	105	16

Common 17-4 Fastener Conditions: Aged Conditions vs Tensile Strength

Aged Condition	Ultimate Tensile (ksi)	Yield Strength at0.2% Offset (ksi)	Elongation%	Hardness Rc
H900	200	185	14	40-47
H925	190	175	14	38-45
H1025	170	165	15	35-42
H1075	165	150	16	33-39
H1100	150	135	17	32-38
H115C	145	125	19	28-37
H1150-M	125	85	22	26-36
Annealed	160	145	5	~35

Hex Head Cap Screw	Hex Head Bolts
Precise applications where tight tolerances on the body dimensions are required. Features flat washer facing under the bolt head.Also called a finished hex bolt.	Appropriate for when mechanical properties are more important than dimensional tolerances. Hex bolts have a flat end and lack the washer face under the head.