ASTM A593

ASTM F593

This specification covers the requirements for stainless steel bolts, hex cap screws, and stud bolts in imperial size 0.25 inch to 1.50 inch, inclusive for number of alloys in common use and intended for service applications requiring general corrosion resistance. ASTM F593 covers seven groups of stsinles steel alloys, including twelve austenitic, two ferritic, four martensitic and one precitipitain hardening. BoltPort manufactures all alloys under ASTM F593 in form of Hex Bolts, Stud Bolts, Threaded Rods, Socket Head Cap Screws duly tested and supply with EN 10204 Type 3.1 Certification.

ASTM F593 Alloy 303 Nut Supply Condition

Group	Alloy^A	Condition Furnished Unless Otherwise Specified
1	303, 303Se	(CW) Cold Worked^B

^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 Sizes 0.75 inch and larger may be hot worked and solutoon annealed.

Optional 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
CW - Headed and rolled from annealed stock thus acquiring a degree of cold work. Sizes 0.75inch and larger may be hot worked and solution annealed.
SH - Machined from strain hardened stock or cold worked to develop the specific properties.

ASTM F593 Alloy 303 Chemical Composition

Composition, %, maximum except as shown
UNS Designation	Alloy Group	Alloy	Carbon	Manganese	Phosphorus	Sulfur	Silicon	Chromium	Nickel	Molybdenum
S30300	1	303	0.15	2.00	0.200	0.150 min	1	17.0 - 19.0	8.0 - 10.0	0.60 max^A

^A At manufacturer's options, determined only when intentionally added.

ASTM F593 Alloy 303 Nut Mechanical Properties

Condition^B	Alloy Mechanical Property Marking	Nominal Diameter, inch	Full Size Tests			Machined Specimen Tests
Condition^B	Alloy Mechanical Property Marking	Nominal Diameter, inch	Tensile Strength, ksi^C	Yield Strength, ksi^DC	Rockwell Hardness	Tensile Strength, ksi^C	Yield Strength, ksi^DC	Elongation in 4D, %
AF	F593A	1/4 to 1-1/2, incl.	65 - 85	20	B85 max	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
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

^A Minimum values except where shown as maximum or as a range.
^B legend of conditions:
AF - Headed and rolled from annealed stock and then reannealed
CW - Headed and rolled from annealed stock thus acquiring a degree of cold work. Sizes 0.75inch and larger may be hot worked and solution annealed.
SH - Machined from strain hardened stock or cold worked to develop the specific properties.
^C The yield and tensile strength values for full size products shall be computed by dividing the yield and maximum tensile load value by the stress area for the product size and thread sizes determined in accordance with Test Methods F606.
^D Yield strength is the stress at which an offset of 0.2 & gauge length occurs.

ASTM F593 Mechanical Test Requirements for Bolts and Studs^A

Item	Nominal Length		Tensile Load, lbf	Full Size Tests				Machined Specimen Tests
	Diameters 3/4 inch and Less	Diameters Over 3/4 inch.		Wedge Tensile Strength	Axial Tensile Strength	Yield Strength	Rockwell Hardness	Tensile Strength	Yield Strength	Elongation
	Diameters 3/4 inch and Less	Diameters Over 3/4 inch.		Wedge Tensile Strength	Axial Tensile Strength	Yield Strength	Rockwell Hardness	Tensile Strength	Yield Strength	Elongation	Hex head, square head and hex socket cap screws	Less than 2-1/4 D	Less than 3D	all	Option A	Option B	^B	Option C	^B	^B	^B
2-1/4 D and longer	3D and longer	120 000 max	Mandatory	^B	Mandatory	^B	^B	^B	^B
2-1/4 D and longer	3D and longer	over 120 000	Option A	^B	Option A	^B	Option B	Option B	Option B
Stud bolts and other bolts	Less than 2-1/4 D	Less than 3D	all	^B	Option A	^B	Option B	^B	^B	^B
	2-1/4 D and longer	3D and longer	120 000 max	^B	Mandatory	Mandatory	^B	^B	^B	^B
	2-1/4 D and longer	3D and longer	over 120 000	^B	Option A	Option A	^B	Option B	Option B	Option B
Specials^C	all	all	all	^B	^B	Mandatory	^B	^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 have full size heads shall be tested as specified for stud bolts and other bolts.

ASTM F593 Tensile Stress Areas and Threads per Inch

Nominal Size, inch.	Coarse Threads - UNC		Fine Threads - UNF		Thread Series - 8UN
Nominal Size, inch.	Threads / inch	Stress Area^A, in²	Threads / inch	Stress Area^A, in²	Threads / inch	Stress Area^A, in²
1/4	20	0.0318	28	0.0364	--	--
5/16	18	0.0524	24	0.0580	--	--
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	0.1820	18	0.2030
5/8	11	0.2260	18	0.2560
3/4	10	0.3340	16	0.3730
7/8	9	0.4620	14	0.5090
1	8	0.6060	12	0.6630
1 1/8	7	0.7630	12	0.8560	8	0.790
1 1/4	7	0.9690	12	1.0730	8	1.000
1 3/8	6	1.1550	12	1.3150	8	1.233
1 1/2	6	1.4050	12	1.5810	8	1.492

^A Tensile stress areas are computed using the following formula:

A^B = 0.7854 [D- (0.9743/n)]²

Where:
A^B = Tensile stress area, inch2,
D = Nominal size (basic major diameter), in., and,
n = number of threads per inch.