ASTM F593 Bolts Specifications

zhao77jie — Fri, 19 Sep 2025 02:00:00 +0000

In fastener applications requiring both high strength and superior corrosion resistance, ASTM F593 bolts are the preferred solution. As the standard established by the American Society for Testing and Materials (ASTM) for stainless steel fasteners, the F593 specification ensures these bolts deliver reliable performance in a wide range of demanding environments.

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What are ASTM F593 Bolts?

ASTM F593 is the standard specification developed by the American Society for Testing and Materials (ASTM) for stainless steel bolts, studs, and screws, primarily covering austenitic, martensitic, and ferritic stainless steel materials. This standard defines the chemical composition, mechanical properties, heat treatment requirements, and manufacturing processes for different stainless steel alloys to ensure product quality and reliability. It is widely used in engineering applications requiring corrosion resistance, mechanical strength, and reliability, including chemical equipment, marine vessels, food processing, construction, and oil and gas industries.

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ASTM F593 Fasteners Specifications

This specification covers the requirements for stainless steel bolts, hex cap screws, and studs 0.25 to 1.50 in., inclusive, in nominal diameter in a number of alloys in common use and intended for service applications requiring general corrosion resistance.

F593 Alloy Groups

Seven groups of stainless steel alloys are covered, including fourteen austenitic, two ferritic, four martensitic, and one precipitation hardening.

Group	Alloy Grades	Condition	Family Type
1	304,305,384,304L,XM1,18-9LW, 302HQD	Cold Worked ( CW )	Austenitic
2	316, 316 L	Cold Worked ( CW )	Austenitic
3	321, 347	Cold Worked ( CW )	Austenitic
4	430E	Cold Worked ( CW )	Ferritic
5	410F	Hardened & Tempered ( H )	Martensitic
6	431	Hardened & Tempered ( H )	Martensitic
7	630	Age Hardened ( AH )	Precipitation Hardening

Chemical Composition

Composition,%,maximum except as shown
UNS Designation	Alloy Group	Alloy	Carbon	Manganese	Phosphorus	Sulfur	Silicon	Chromium	Nickel	Copper	Molybdenum	Others
Austenitic Alloys
S30200	1	303	0.15	2.00	0.200	0.150 min	1	17.0- 19.0	8.0- 10.0		0.60 max^
S30323	1	303 Se	0.15	2.00	0.200	0.060	1	17.0- 19.0	8.0- 10.0			Se 0.15min
A30400	1	304	0.08	2.00	0.045	0.030	1	18.0- 20.0	8.0- 10.5	1.00
S30403	1	304L	0.03	2.00	0.045	0.030	1	18.0- 20.0	8.0- 12.0	1.00
S30500	1	305	0.12	2.00	0.045	0.030	1	17.0- 19.0	10.5- 13.0	1.00
S38400	1	384	0.08	2.00	0.045	0.030	1	15.0- 17.0	17.0- 19.0		0.50 max⁴
S20300	1	XM1	0.08	5.00-6.50	0.040	0.18- 0.35	1	16.0- 18.0	5.0-6.5	1.75- 2.25
S30430	1	18- 9LW	0.10	2.00	0.045	0.030	1	17.0- 19.0	8.0- 10.0	3.0-4.0
S30433	1	302HQ	0.03	2.00	0.045	0.030	1	17.0- 19.0	8.0- 10.0	3.0-4.0
S31600	2	316	0.08	2.00	0.045	0.030	1	16.0- 18.0	10.0- 14.0		2.0-3.0
S31603	2	316 L	0.03	2.00	0.045	0.030	1	16.0- 18.0	10.0- 14.0		2.0-3.0
S32100	3	321	0.08	2.00	0.045	0.030	1	17.0- 19.0	9.0- 12.0			Ti 5xCmin
S34700	3	347	0.08	2.00	0.045	0.030	1	17.0- 19.0	9.0- 13.0			Cb+Ta 10x C min
Ferritic Alloys
S43000	4	430	0.12	1.00	0.040	0.030	1	16.0- 18.0
S43020	4	430F	0.12	1.25	0.060	0.150 min	1	16.0- 18.0			0.60 max
Martensitic Alloys
S41000	5	410	0.15	1.00	0.040	0.030	1	11.5- 13.5
S41600	5	416	0.15	1.25	0.060	0.150 min	1	12.0- 14.0			0.60 max⁴
S41623	5	416 Se	0.15	1.25	0.060	0.060	1	12.0- 14.0			Se 0.15min
S43100	6	431	0.20	1.00	0.040	0.030	1	15.0- 17.0	1.25- 2.50
Precipitation Hardening Alloy
S17400	7	630	0.07	1.00	0.040	0.030	1	15.0- 17.5	3.0-5.0			Cb+Ta 0.15 -0.45

Mechanical Properties

Stainless Steel Alloys	ConditionB	Alloy Mechanical Property Marking	Nominimumal Diameter, inch	Full Size Tests			Machined Specimen Tests
Stainless Steel Alloys	ConditionB	Alloy Mechanical Property Marking	Nominimumal Diameter, inch	Tensile Strength, ksiC	Yield Strength, ksiDC	Rockwell Hardness	Tensile Strength, ksiC	Yield Strength, ksiDC	Elongation in 4D, %
Austenitic Alloys
1 (303, 304, 304L, 305, 384, XM1, 18-9LW, 302HQ, 303Se)	AF	F593A	1/4 to 1-1/2, incl.	65 – 85	20	B85 maximum	60	20	40
	A	F593B	1/4 to 1-1/2, incl.	75 – 100	30	B65 to 95	70	30	30
	CW1	F593C	1/4 to 5/8, incl.	100 – 150	65	B95 to C322	95	60	20
	CW2	F593D	3/4 to 1-1/2, incl.	85 – 140	45	B80 to C32	80	40	25
	SH1	F593A	1/4 to 5/8, incl.	120 – 160	95	C24 to C36	115	90	12
	SH2	F593B	3/4 to 1, incl.	110 – 150	75	C20 to C32	105	70	15
	SH3	F593C	1-1/8 to 1-1/4, incl.	100 – 140	60	B95 to C30	95	55	20
	SH4	F593D	1-3/8 to 1-1/2, incl.	95 – 130	45	B90 to C28	90	40	28
2 (316, 316L)	AF	F593E	1/4 to 1-1/2″, incl.	65 – 85	20	B85 maximum	60	20	40
	A	F593F	1/4 to 1-1/2″, incl.	75 – 100	30	B65 to 95	70	30	30
	CW1	F593G	1/4 to 5/8, incl.	100 – 150	65	B95 to C322	95	60	20
	CW2	F593H	3/4 to 1-1/2, incl.	85 – 140	45	B80 to C32	80	40	25
	SH1	F593E	1/4 to 5/8, incl.	120 – 160	95	C24 to C36	115	90	12
	SH2	F593F	3/4 to 1, incl.	110 – 150	75	C20 to C32	105	70	15
	SH3	F593G	1-1/8 to 1-1/4, incl.	100 – 140	60	B95 to C30	95	55	20
	SH4	F593H	1-3/8 to 1-1/2, incl.	95 – 130	45	B90 to C28	90	40	28
3 (321, 347)	AF	F593J	1/4 to 1-1/2, incl.	65 – 85	20	B85 max	60	20	40
	A	F593K	1/4 to 1-1/2, incl.	75 – 100	30	B65 to 95	70	30	30
	CW1	F593L	1/4 to 5/8, incl.	100 – 150	65	B95 to C322	95	60	20
	CW2	F593M	3/4 to 1-1/2, incl.	85 – 140	45	B80 to C32	80	40	25
	SH1	F593J	1/4 to 5/8, incl.	120 – 160	95	C24 to C36	115	90	12
	SH2	F593K	3/4 to 1, incl.	110 – 150	75	C20 to C32	105	70	15
	SH3	F593L	1-1/8 to 1-1/4, incl.	100 – 140	60	B95 to C30	95	55	20
	SH4	F593M	1-3/8 to 1-1/2, incl.	95 – 130	45	B90 to C28	90	40	28
Ferritic Alloys
4 (430, 430F)	AF	F593X	1/4 to 1-1/2, incl.	55 – 75	30	B85 maximum	50	25	—
	A	F593N	1/4 to 1-1/2, incl.	55 – 75	30	B85 maximum	50	25	—
	CW1	F593V	1/4 to 5/8, incl.	60 – 105	40	B75 to 98	55	35	—
	CW2	F593W	3/4 to 1-1/2, incl.	55 – 100	30	B65 to 95	50	25	—
Martensitic Alloys
5 (410, 416, 416Se)	H	F593P	1/4 to 1-1/2, incl.	110 – 140	90	C20 to 30	110	90	18
	H	F593P	1/4 to 1-1/2, incl.	110 – 140	90	C20 to 30	110	90	18
	HT	F593R	1/4 to 1-1/2, incl.	160 – 190	120	C34 to 45	160	120	12
6 (431)	H	F593S	1/4 to 1-1/2, incl.	125 – 150	100	C25 to 32	125	100	15
6 (431)	HT	F593T	1/4 to 1-1/2, incl.	180 – 220	140	C40 to 48	180	140	10
Precipitation Hardening Alloy
7 (630)	AH	F593U	1/4 to 1-1/2, incl.	135 – 170	105	C28 to 38

Tensile Stress Areas and Threads per Inch

Nominimumal Size, inch.	Coarse Threads – UNC		Fine Threads – UNF		Thread Series – 8UN
Nominimumal Size, inch.	Threads / inch	Stress AreaA, in2	Threads / inch	Stress AreaA, in2	Threads / inch	Stress AreaA, in2
1/4	20	0.0318	28	0.0364	—	—
5/16	18	0.0524	24	0.058	—	—
3/18	16	0.0775	24	0.0878	—	—
7/16	14	0.1063	20	0.1187
1/2	13	0.1419	20	0.1599
9/16	12	0.182	18	0.203
5/8	11	0.226	18	0.256
3/4	10	0.334	16	0.373
7/8	9	0.462	14	0.509
1	8	0.606	12	0.663
1 1/8	7	0.763	12	0.856	8	0.79
1 1/4	7	0.969	12	1.073	8	1
1 3/8	6	1.155	12	1.315	8	1.233
1 1/2	6	1.405	12	1.581	8	1.492

Referenced Documents

ASTM A193 / A193M – 16 : Specifications for High-Temperature Bolting, with Expansion Coefficients Comparable to Austenitic Stainless Steels

ASTM A1082 / A1082M – 16 : Specifications for High Strength Precipitation Hardening and Duplex Stainless Steel Bolting for Special Purpose Applications

ASTM F2281 : Specifications for Stainless Steel and Nickel Alloy Bolts, Hex Cap Screws, and Studs, for Heat Resistance and High Temperature Applications Designation

ASTM A1014 / A1014M – 16 : Specifications for Precipitation-Hardening Bolting (UNS N07718) for High Temperature Service

ASTM A962 / A962M – 16a : Specifications for Common Requirements for Bolting Intended for Use at Any Temperature from Cryogenic to the Creep Range

ASTM A638 / A638M : Specifications for Precipitation Hardening Iron Base Superalloy Bars, Forgings, and Forging Stock for High-Temperature Service

ASTM F593 VS ASTM A193

Feature	ASTM F593	ASTM A193
Material	Austenitic, martensitic, or ferritic stainless steel	Alloy steel and stainless steel
Application	Mainly used in general corrosion-resistant environments, such as chemical equipment, marine facilities, food processing, etc.	Mainly used in high temperature, high pressure, and corrosive service, such as boilers, pressure vessels, valves, and flanges
Mechanical Properties	Focus on corrosion resistance and moderate strength, tensile strength typically between 515–860 MPa (depending on condition)	High tensile strength and creep resistance, tensile strength typically between 585–1000+ MPa
Standards and Grades	Covers multiple stainless steel grades, such as 304, 304L, 316, 316L, 321, 410, etc.	Covers alloy steel and stainless steel grades, such as B7, B8, B8M, B16, etc.
Heat Treatment	Some grades may not require heat treatment	Most alloy steel grades (e.g., B7) require quenching and tempering
Typical Industries	Chemical, marine, food, pharmaceutical, general structural use	Petrochemical, power generation, oil & gas, high temperature and high pressure piping systems

Why Choose ASTM F593 Bolts?

Marine Engineering and Shipbuilding: In seawater, saltwater corrosion poses a significant challenge to ordinary bolts. F593 F/G grades, with their excellent resistance to chloride corrosion, are ideal fasteners for ships, docks, and offshore platforms.

Chemical and Pharmaceutical Industries: Many chemicals are highly corrosive. F593 bolts are used to connect pipes, valves, and reactors, ensuring the integrity and safety of equipment.

Construction and Civil Engineering: In outdoor structures like bridges and tunnels, bolts must withstand rain, moisture, and contaminants for extended periods. Stainless steel bolts effectively prevent rust and corrosion.

Food Processing and Medical Equipment: These industries place extremely high demands on hygiene. Stainless steel’s smooth, easy-to-clean surface and resistance to bacterial growth make ASTM F593 bolts indispensable.

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