ASTM F593

ASTM F593 Bolting Specification

Stainless steel Bolts, Hex cap screws, and Studs intended for service applications requiring general corrosion resistance

Overview

Adfast Component LTD: Premium Stainless Steel Fasteners

At Adfast Component LTD, we proudly offer stainless steel bolts, hex cap screws, and studs that meet the ASTM F593 specification. Designed for nominal diameters ranging from 1/4 inch to 1 1/2 inch, our fasteners are crafted using high-quality alloys that ensure excellent general corrosion resistance. Covering seven alloy groups, including austenitic, ferritic, martensitic, and precipitation-hardening grades, these fasteners are perfect for demanding service applications.

To complement our bolts, screws, and studs, we also provide ASTM F594-compliant nuts, ensuring a precise fit and reliable performance. All nuts are made from the same alloy group and adhere to minimum proof stress standards, aligning with the tensile strength of threaded fasteners. Trust Adfast Component LTD for fasteners made from premium materials like those listed under ASTM A276, A493, A564/A564M, and A582/A582M specifications.

Scope

Group	Alloys^A	Condition^B	Optional Conditions (must be specified)	Alloy Type
1	304, 305, 384, 304 L,	(CW) cold worked^C	AF, A, SH	Austenitic
1	18-9LW, 302HQ, 304J3^D	(CW) cold worked^C
2	316, 316 L	CW) cold worked^C
3	321, 347	(CW) cold worked^C
4	430^E	(CW) cold worked^C	A	Ferritic
5	410^F	(H) hardened and tempered	HT	Martensitic
6	431	(H) hardened and tempered	HT	Martensitic
7	630	(AH) age hardened	none	Precipitation Hardening
A) Unless otherwise specified on the inquiry and order, the choice of an alloy from within a group shall be at the discretion of the fastener manufacturer. (B) See 4.2 for options. (C) Sizes 0.75 in. and larger may be hot worked and solution annealed, provided the bolts comply with the cold worked (CW) mechanical property requirements. (D) When approved by the purchaser, Alloys 303, 303Se, or XM1 may be furnished. (E) When approved by the purchaser, Alloy 430F may be furnished. (F) When approved by the purchaser, Alloys 416 or 416Se may be furnished. A – Machined from annealed or solution-annealed stock thus retaining the properties of the original material; or hot-formed and solution annealed. properties of the original material; or hot-formed and solution annealed. AF – Headed and rolled from annealed stock and then reannealed. AH – Solution-annealed and age-hardened after forming. CW – Headed and rolled from annealed stock thus acquiring a degree of cold work. Sizes 0.75 in. and larger may be hot-worked and solution-annealed. H – Hardened and tempered at 1050°F (565°C) minimum. HT – Hardened and tempered at 525°F (274°C) minimum. SH – Machined from strain-hardened stock or cold-worked to develop the specific properties.

Chemical Composition

Alloy Group	Alloys
1	304, 304 L, 305, 384, 18-9LW, 302HQ, 304J3^A
2	316, 316 L
3	321, 347
4	430^B
5	410^C
6	431
7	630
(A) When approved by the purchaser, Alloys 303, 303Se, or XM1 may be furnished. (B) When approved by the purchaser, Alloy 430F may be furnished. (C) When approved by the purchaser, Alloys 416 or 416Se may be furnished.

Chemical Requirements

Alloy Group	UNS Designation	Alloy	Carbon	Manganese	Phosphorus	Sulfur	Silicon	Chromium	Nickel	Copper	Molybdenum	Others
1	S30300	303	0.15	2.00	0.20	0.15 min	1.00	17.0 to 19.0	8.0 to 10.0	. . .	0.60 max^A	. . .
	S30323	303 Se	0.15	2.00	0.20	0.060	1.00	17.0 to 19.0	8.0 to 10.0	. . .	. . .	Se 0.15 min
	S30400	304	0.08	2.00	0.045	0.030	1.00	18.0 to 20.0	8.0 to 10.5	1.00	. . .	. . .
	S30403	304 L	0.03	2.00	0.045	0.030	1.00	18.0 to 20.0	8.0 to 12.0	1.00	. . .	. . .
	S30500	305	0.12	2.00	0.045	0.030	1.00	17.0 to 19.0	10.5 to 13.0	1.00	. . .	. . .
	S38400	384	0.08	2.00	0.045	0.030	1.00	15.0 to 17.0	17.0 to 19.0	. . .	0.50 max^A	. . .
	S20300	XM1	0.08	5.0 to 6.5	0.040	0.18 to 0.35	1.00	16.0 to 18.0	5.0 to 6.5	1.75 to 2.25	. . .	. . .
	S30430	18-9LW	0.10	2.00	0.045	0.030	1.00	17.0 to 19.0	8.0 to 10.0	3.0 to 4.0	. . .	. . .
	S30433	302HQ	0.03	2.00	0.045	0.030	1.00	17.0 to 19.0	8.0 to 10.0	3.0 to 4.0	. . .	. . .
	. . .	304J3^B	0.08	2.00	0.045	0.030	1.00	17.0 to 19.0	8.0 to 10.5	1.00 to 3.00	. . .	. . .
2	S31600	316	0.08	2.00	0.045	0.030	1.00	16.0 to 18.0	10.0 to 14.0	. . .	2.00 to 3.00	. . .
2	S31603	316 L	0.03	2.00	0.045	0.030	1.00	16.0 to 18.0	10.0 to 14.0	. . .	2.00 to 3.00	. . .
3	S32100	321	0.08	2.00	0.045	0.030	1.00	17.0 to 19.0	9.0 to 12.0	. . .	. . .	Ti 5× C min
3	S34700	347	0.08	2.00	0.045	0.030	1.00	17.0 to 19.0	9.0 to 13.0	. . .	. . .	Cb+Ta 10 × C min
4	S43000	430	0.12	1	0.04	0.030	1	16.0 to 18.0	. . .	. . .	0.60 maxA	. . .
4	S43020	430F	0.12	1.25	0.06	0.15 min	1	16.0 to 18.0	. . .	. . .	. . .	. . .
5	S41000	410	0.15	1	0.04	0.03	1	11.5 to 13.5	. . .	. . .	0.60 maxA	Se 0.15 min
	S41600	416	0.15	1.25	0.06	0.15 min	1	12.0 to 14.0	. . .	. . .	. . .	. . .
	S41623	416Se	0.15	1.25	0.06	0.06	1	12.0 to 14.0	. . .	. . .	. . .	. . .
6	S4310	431	0.20	1.00	0.040	0.030	1.00	15.0 to 17.0	1.25 to 2.50	. . .	. . .	. . .
7	S17400	630	0.07	1.00	0.040	0.030	1.00	15.0 to 17.5	3.0 to 5.0	3.0 to 5.0	. . .	Cb+Ta 0.15-0.45
(A) At manufacturer’s option, determined only when intentionally added. (B) 304J3 from JIS Standard G4309.

Mechanical Requirements

Stainless Alloy Group	Condition^B	Alloy Mechanical Property Marking	Nominal Diameter, in.	Full-Size Tests			Machined Specimen Tests
Stainless Alloy Group	Condition^B	Alloy Mechanical Property Marking	Nominal Diameter, in.	Tensile Strength ksi^C	Yield Strength, ksi^D^,^C	Rockwell Hardness	Tensile Strength ksi^C	Yield Strength, ksi^D^,^C	Elongation in 4 D, %
1 (303, 304,304 L, 305,384,XM1, 18-9LW, 302HQ, 304J3, 303Se)	AF	F593A	¹/₄ to 1¹/₂ , incl	65 to 85	20	B85 max	60	20	40
	A	F593B	¹/₄ to 1¹/₂ , incl	75 to 100	30	B65 to 95	70	30	30
	CW1	F593C	¹/₄ to ⁵/₈ , incl	100 to 150	65	B95 to C32	95	60	20
	CW2	F593D	³/₄ to 1¹/₂ , incl	85 to 140	45	B80 to C32	80	40	25
	SH1	F593A	¹/₄ to ⁵/₈ , incl	120 to 160	95	C24 to C36	115	90	12
	SH2	F593B	³/₄ to 1, incl	110 to 150	75	C20 to C32	105	70	15
	SH3	F593C	1¹/₈ to 1¹/₄ , incl	100 to 140	60	B95 to C30	95	55	20
	SH4	F593D	1³/₈ to 1¹/₂ , incl	95 to 130	45	B90 to C28	90	40	28
2 (316,316L)	AF	F593E	¹/₄ to 1¹/₂ , incl	65 to 85	20	B85 max	60	20	40
	A	F593F	¹/₄ to 1¹/₂ , incl	75 to 100	30	B65 to 95	70	30	30
	CW1	F593G	¹/₄ to ⁵/₈ , incl	100 to 150	65	B95 to C32	95	60	20
	CW2	F593H	³/₄ to 1¹/₂ , incl	85 to 140	45	B80 to C32	80	40	25
	SH1	F593E	¹/₄ to ⁵/₈ , incl	120 to 160	95	C24 to C36	115	90	12
	SH2	F593F	³/₄ to 1, incl	110 to 150	75	C20 to C32	105	70	15
	SH3	F593G	1¹/₈ to 1¹/₄ , incl	100 to 140	60	B95 to C30	95	55	20
	SH4	F593H	1³/₈ to 1¹/₂ , incl	95 to 130	45	B90 to C28	90	40	28
3 (321, 347)	AF	F593J	¹/₄ to 1¹/₂ , incl	65 to 85	20	B85 max	60	20	40
	A	F593K	¹/₄ to 1¹/₂ , incl	75 to 100	30	B65 to 95	70	30	30
	CW1	F593L	¹/₄ to ⁵/₈ , incl	100 to 150	65	B95 to C32	95	60	20
	CW2	F593M	³/₄ to 1¹/₂ , incl	85 to 140	45	B80 to C32	80	40	25
	SH1	F593J	¹/₄ to ⁵/₈ , incl	120 to 160	95	C24 to C36	115	90	12
	SH2	F593K	³/₄ to 1, incl	110 to 150	75	C20 to C32	105	70	15
	SH3	F593L	1¹/₈ to 1¹/₄ , incl	100 to 140	60	B95 to C30	95	55	20
	SH4	F593M	1³/₈ to 1¹/₂ , incl	95 to 130	45	B90 to C28	90	40	28
4 (430, 430F)	AF	F593X	¹/₄ to 1¹/₂ , incl	55 to 75	30	B85 max	50	25	. . .
	A	F593N	¹/₄ to 1¹/₂ , incl	55 to 75	30	B85 max	50	25	. . .
	CW1	F593V	¹/₄ to ⁵/₈ , incl	60 to 105	40	B75 to 98	55	35	. . .
	CW2	F593W	³/₄ to 1¹/₂ , incl	55 to 100	30	B65 to 95	50	25	. . .
5 (410, 416, 416Se)	H	F593P	¹/₄ to 1¹/₂ , incl	110 to 140	90	C20 to 30	110	90	18
5 (410, 416, 416Se)	HT	F593R	¹/₄ to 1¹/₂ , incl	160 to 190	120	C34 to 45	160	120	12
6 (431)	H	F593S	¹/₄ to 1¹/₂ , incl	125 to 150	100	C25 to 32	125	100	15
6 (431)	HT	F593T	¹/₄ to 1¹/₂ , incl	180 to 220	140	C40 to 48	180	140	10
7 (630)	AH	F593U	¹/₄ to 1¹/₂ , incl	135 to 170	105	C28 to 38	135	105	16
(A) Minimum values except where shown as maximum or as a range. (B) Legend of conditions: A-Machined from annealed or solution-annealed stock thus retaining the properties of the original material, or hot-formed and solution-annealed. AF-Headed and rolled from annealed stock and then reannealed. AH-Solution annealed and age-hardened after forming. CW-Headed and rolled from annealed stock thus acquiring a degree of cold work; sizes 0.75 in. and larger may be hot worked and solution-annealed. H-Hardened and tempered at 1050°F (565°C) minimum. HT-Hardened and tempered at 525°F (274°C) minimum. SH-Machined from strain hardened stock or cold-worked to develop the specified properties. (C) The yield and tensile strength values for full-size products shall be computed by dividing the yield and maximum tensile load values by the stress area for the product size and thread series determined in accordance with Test Methods F606/F606M. (D) Yield strength is the stress at which an offset of 0.2 % gage length occurs.

Test Requirements
Tensile Stress

Item	Nominal Length		Tensile Load, lbf	Full-Size Tests				Machined Specimen Tests
Item	Diameters³/₄in. and Less	Diameters Over³/₄in.	Tensile Load, lbf	Wedge Tensile Strength	Axial Tensile Strength	Yield Strength	Rockwell Hardness	Tensile Strength	Yield Strength	Elongation
Square and hexbolts and hexcap screws	less than 2¹/₄D	less than 3D	all	Option A	^B	^B	Option C	^B	^B	^B
	2¹/₄Dand longer	3Dand longer	120000 max	mandatory	^B	mandatory	^B	^B	^B	^B
	2¹/₄Dand longer	3Dand longer	over 120000	Option A	^B	Option A	^B	Option B	Option B	Option B
Studs and otherbolts	less than 2¹/₄D	less than 3D	all	^B	Option A	^B	Option C	^B	^B	^B
	2¹/₄Dand longer	3D and longer	120000 max	^B	mandatory	mandatory	^B	^B	^B	^B
	2¹/₄Dand longer	3D and longer	over 120000	^B	Option A	Option A	^B	Option B	Option B	Option B
Specials^C	all	all	all	^B	^B	^B	mandatory	^B	^B	^B
(A) Where options are given, all the tests under an option shall be performed. Option A, Option B, and Option C indicates manufacturer may perform all Option A (full-size), all Option B (machined specimen), or all Option C tests whichever is preferred. Option A tests should be made whenever feasible. (B) Tests that are not mandatory. (C) Special fasteners are those fasteners with special configurations including drilled heads, reduced body, etc., that are weaker than the threaded section. Special fasteners having full-size heads shall be tested as specified for studs and other bolts.

Nominal Size, in. (D)	Coarse Threads-UNC		Fine Threads-UNF		Thread Series-8 UN
Nominal Size, in. (D)	Threads/in.	Stress Area^A, in.²	Threads/in.	Stress Area^A, in.²	Threads/in.	Stress Area^A, in.²
¹/₄ (0.250)	20	0.0318	28	0.0364	. . .	. . .
⁵/₁₆ (0.3125)	18	0.0524	24	0.0580	. . .	. . .
³/₁₈ (0.375)	16	0.0775	24	0.0878	. . .	. . .
⁷/₁₆ (0.4375)	14	0.1063	20	0.1187	. . .	. . .
¹/₂ (0.500)	13	0.1419	20	0.1599	. . .	. . .
⁹/₁₆ (0.5625)	12	0.1820	18	0.2030	. . .	. . .
⁵/₈ (0.625)	11	0.2260	18	0.2560	. . .	. . .
³/₄ (0.750)	10	0.3340	16	0.3730	. . .	. . .
⁷/₈ (0.875)	9	0.4620	14	0.5090	. . .	. . .
1.000	8	0.6060	12	0.6630	. . .	. . .
1¹/₈ (1.125)	7	0.7630	12	0.8560	8	0.790
1¹/₄ (1.250)	7	0.9690	12	1.0730	8	1.000
1³/₈ (1.375)	6	1.1550	12	1.3150	8	1.233
1¹/₂ (1.500)	6	1.4050	12	1.5810	8	1.492
(A) Tensile stress areas are computed using the following formula: A_s = 0.7854 [D – 0.9743/n]² where: As = tensile stress area, in.2, D = nominal size (basic major diameter), in., and n = number of threads per inch.

Coating Specifications

Renowned Brands

Bolting Components Marking

Product Shall be Marked with our manufacturing trade mark Adfast Component LTD along with the designated Grade.
Grade and manufacturer’s identification symbols shall be applied to one end of studs and to the heads of bolts and screws of all sizes. (If the available area is inadequate, the grade symbol may be marked on one end and the manufacturer’s identification symbol marked on the other end.) For bolts and screws smaller than 1⁄4 in. [6 mm] in diameter and studs smaller than 3⁄8 in. [10 mm] in diameter and for 1⁄4 in. [6 mm] in diameter studs requiring more than a total of three symbols, the marking shall be a matter of agreement between the purchaser and the manufacturer.

Dimensional Standards

ASME Bolt Dimensional Standards

B18.31.2 Imperial Continious Thread, Double End Reduced & Full Body Studs
B18.31.3 Threaded Rods (Inch Series)
B16.5 Imperial Full Thread Stud Bolts
B16.5 Metric Full Thread Stud Bolts
B18.2.1 Imperial Square and Hex Bolts and Screws
B18.3 Imperial Hexagon Socket and Spline Socket Screws

Certification

Testing Standards

E18 Test Methods for Rockwell Hardness of Metallic Materials
E21 Test Methods for Elevated Temperature Tension Tests of Metallic Materials
E112 Test Methods for Determining Average Grain Size
E139 Test Methods for Conducting Creep, Creep-Rupture,and Stress-Rupture Tests of Metallic Materials
E150 Recommended Practice for Conducting Creep and Creep-Rupture Tension Tests of Metallic Materials Under Conditions of Rapid Heating and Short Times
E151 Recommended Practice for Tension Tests of Metallic Materials at Elevated Temperatures with Rapid Heating and Conventional or Rapid Strain Rates
E292 Test Methods for Conducting Time-for-Rupture Notch Tension Tests of Materials
E328 Test Methods for Stress Relaxation for Materials and Structures
E566 Practice for Electromagnetic (Eddy Current) Sorting of Ferrous Metals
E709 Guide for Magnetic Particle Testing
F606/F606M Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, Direct Tension Indicators, and Rivets
F1940 Test Method for Process Control Verification to Prevent Hydrogen Embrittlement in Plated or Coated Fasteners
A962/A962M Specification for Common Requirements for Bolting Intended for Use at Any Temperature from Cryogenic to the Creep Range
A788/A788M for Steel Forgings, General Requirements

Product

Precision Components

Contract Manufacturing

Fastener

Resources

materials

Technical