The following data is given for general information purposes only and is not to be considered engineering advice. Please consult with an engineer prior to using this data.

ASTM, SAE & ISO Grade Markings & Mechanical Properties For Exotic Fasteners

Identification
Grade Mark
Specification Fastener
Description
Material Nominal Size
Range (in.)
Mechanical Properties
Proof Load
(psi)
Yield Strength
Min (psi)
Tensile Strength
Min (psi)

B5
ASTM A193
Grade B5
  AISI 501 1/4 Thru 4 -- 80,000 100,000

B6
ASTM A193
Grade B6
AISI 410 85,000 110,000

B7
ASTM A193
Grade B7
AISI 4140, 4142, OR 4105 1/4 thru 2-1/2
Over 2-1/2 thru 4
Over 4 thru 7
--
--
--
105,000
95,000
75,000
125,000
115,000
100,000

B16
ASTM A193
Grade B16
CrMoVa Alloy Steel 105,000
95,000
85,000
125,000
115,000
100,000

B8
ASTM A193
Grade B8
AISI 304 1/4 and larger -- 30,000 75,000

B8C
ASTM A193
Grade B8C
AISI 347

B8M
ASTM A193
Grade B8M
AISI 316

B8T
ASTM A193
Grade B8T
Bolts,
Screws,
Studs for High-Temperature Service
AISI 321 1/4 and larger -- 30,000 75,000

B8
ASTM A193
Grade B8
AISI 304
Strain Hardened
1/4 thru 3/4
Over 3/4 thru 1
Over 1 thru 1-1/4
Over 1-1/4 thru 1-1/2
--
--
--
--
100,000
80,000
65,000
50,000
125,000
115,000
105,000
100,000

B8C
ASTM A193
Grade B8C
AISI 347
Strain Hardened

B8M
ASTM A193
Grade B8M
AISI 316
Strain Hardened
95,000
80,000
65,000
50,000
110,000
100,000
95,000
90,000

B8T
ASTM A193
Grade B8T
AISI 321
Strain Hardened
100,000
80,000
65,000
50,000
125,000
115,000
105,000
100,000

L7
ASTM A320
Grade L7
Bolts,
Screws,
Studs for Low-Temperature Service
AISI 4140,
4142 or 4145
1/4 thru 2-1/2 -- 105,000 125,000

L7A
ASTM A320
Grade L7A
AISI 4037

L7B
ASTM A320
Grade L7B
AISI 4137

L7C
ASTM A320
Grade LC7
AISI 8740

L43
ASTM A320
Grade L43
AISI 4340 1/4 thru 4 -- 105,000 125,000

B8
ASTM A320
Grade B8
Bolts,
Screws,
Studs for Low-Temperature Service
AISI 304 1/4 and larger -- 30,000 75,000

B8C
ASTM A320
Grade B8C
AISI 347

B8T
ASTM A320
Grade B8T
AISI 321

B8F
ASTM A320
Grade B8F
AISI 303
or 303Se

B8M
ASTM A320
Grade B8M
AISI 316

B8
ASTM A320
Grade B8
AISI 304 1/4 thru 3/4
Over 3/4 thru 1
Over 1 thru 1-1/4
Over 1-1/4 thru 1-1/2
--
--
--
--
100,000
80,000
65,00
50,00
100,000
80,000
65,00
50,00

B8C
ASTM A320
Grade B8C
AISI 347

B8F
ASTM A320
Grade B8F
AISI 303
or 303Se

B8M
ASTM A320
Grade B8M
AISI 316

B8T
ASTM A320
Grade B8T
AISI 321
SAE J429
Grade 5
Bolts,
Screws,
Studs
Medium Carbon Steel, Quenched and Tempered 1/4 thru 1
Over 1 to 1-1/2
85,000
74,000
92,000
81,000
120,000
105,000
ASTM A449 1/4 thru 1
Over 1 to 1-1/2
Over 1-1/2 thru 3
85,000
74,000
55,000
92,000
81,000
58,000
120,000
105,000
90,000
SAE J429
Grade 5.1
Sems Low or Medium Carbon Steel, Quenched and Tempered No. 6
thru 3/8
85,000 -- 120,000
SAE J429
Grade 5.2
Bolts,
Screws,
Studs
Low Carbon Martensitic Steel, Quenched and Tempered 1/4 thru 1 85,000 92,000 120,000

A325
ASTM A325
Type 1
High Strength
Structural Bolts
Medium Carbon Steel, Quenched and Tempered 1/2 thru 1
1-1/8 thru 1-1/2
85,000
74,000
92,000
81,000
120,000
105,000

A325
ASTM A325
Type 2
Low Carbon Martensitic Steel, Quenched and Tempered 1/2 thru 1 85,000 92,000 120,000

A325
ASTM A325
Type 3
Atmospheric Corrosion Resisting Steel, Quenched and Tempered 1/2 thru 1
1-1/8 thru 1-1/2
85,000
74,000
92,000
81,000
120,000
105,000

BB
ASTM A354
Grade BB
Bolts,
Studs
Alloy Steel, Quenched and Tempered 1/4 thru 2-1/2
2-3/4 thru 4
80,000
75,000
83,000
78,000
105,000
100,000

BC
ASTM A354
Grade BC
105,000
95,000
109,000
99,000
125,000
115,000
SAE J429
Grade 7
Bolts,
Screws,
Medium Carbon Alloy Steel, Quenched and Tempered 4 1/4 thru 1-1/2 105,000 115,000 133,000
SAE J429
Grade 8
Bolts,
Screws,
Studs
Medium Carbon Alloy Steel, Quenched and Tempered 1/4 thru 1-1/2 120,000 130,000 150,000
ASTM A354
Grade BD
Alloy Steel, Quenched and Tempered 4

No Grade
Mark
SAE J429
Grade 8.1
Studs Medium Carbon Alloy or SAE 1041 Modified Elevated Temperature Drawn Steel 1/4 thru 1-1/2 120,000 130,000 150,000

A490
ASTM A490 High Strength Structural Bolts Alloy Steel, Quenched and Tempered 1/2 thru 1-1/2 120,000 130,000 150,000 min
170,000 max

 

Mechanical Requirements for Stainless Steel & Non-Ferrous Fasteners

Grade General
Descpription
of Material

Bolts, Screws and Studs

Nuts

Full Size Bolts,
Screws, Studs
Machine Test Sprecimens of
Bolts, Screws, Studs
Hardness
Rockwell
Proof
Load
Stress
Hardness
Rockwell
Yield
Strength
Tensile
Strength
Yield
Strength
Tensile
Strength
Elong-
ation
Min psi Min psi Min psi Min psi % Min. Min psi Min
303A Austenitic
Stainless Steel-
Sol. Annealed
30,000 75,000 30,000 75,000 20 B75 75,000 B75
304-A Austenitic
Stainless Steel-
Sol. Annealed
30,000 75,000 30,000 75,000 20 B75 75,000 B75
304 Austenitic
Stainless Steel-
Cold Worked
50,000 90,000 45,000 85,000 20 B85 90,000 B85
304-SH Austenitic
Stainless Steel-
Strain Hardened
See
Note 6
See
Note 6
See
Note 6
See
Note 6
15 C25 See
Note 6
C20
305-A Austenitic
Stainless Steel-
Sol. Annealed
30,000 75,000 30,000 75,000 20 B70 75,000 B70
305 Austenitic
Stainless Steel-
Cold Worked
50,000 90,000 45,000 85,000 20 B85 90,000 B85
305-SH Austenitic
Stainless Steel-
Strain Hardened
See
Note 6
See
Note 6
See
Note 6
See
Note 6
15 C25 See
Note 6
C20
316-A Austenitic
Stainless Steel-
Sol. Annealed
30,000 75,000 30,000 75,000 20 B70 75,000 B70
316 Austenitic
Stainless Steel-
Cold Worked
50,000 90,000 45,000 85,000 20 B85 90,000 B85
316-SH Austenitic
Stainless Steel-
Strain Hardened
See
Note 6
See
Note 6
See
Note 6
See
Note 6
15 C25 See
Note 6
C20
XM7-A Austenitic
Stainless Steel-
Sol. Annealed
30,000 75,000 30,000 75,000 20 B70 75,000 B70
XM7 Austenitic
Stainless Steel-
Cold Worked
50,000 90,000 45,000 85,000 20 B85 90,000 B85
384-A Austenitic
Stainless Steel-
Sol. Annealed
30,000 75,000 30,000 75,000 20 B70 75,000 B70
384 Austenitic
Stainless Steel-
Cold Worked
50,000 90,000 45,000 85,000 20 B85 90,000 B85
410-H Martensitic
Stainless Steel-
Hardened and
Tempered
95,000 125,000 95,000 125,000 20 C22 125,000 C22
410-HT Martensitic
Stainless Steel-
Hardened and
Tempered
135,000 180,000 135,000 180,000 12 C36 180,000 C36
416-H Martensitic
Stainless Steel-
Hardened and
Tempered
95,000 125,000 95,000 125,000 20 C22 125,000 C22
416-HT Martensitic
Stainless Steel-
Hardened and
Tempered
135,000 180,000 135,000 180,000 12 C36 180,000 C36
430 Ferritic
Stainless Steel
40,000 70,000 40,000 70,000 20 B75 70,000 B75
464-HF Naval Brass 15,000 52,000 14,000 50,000 25 B56 52,000 B56
464 Naval Brass 27,000 60,000 25,000 57,000 25 B65 60,000 B65
462 Naval Brass 27,000 52,000 24,000 50,000 20 B65 52,000 B65
642 Aluminum Bronze 35,000 72,000 35,000 72,000 15 B75 72,000 B75
630 Aluminum Bronze 50,000 105,000 50,000 105,000 10 B90 105,000 B90
614 Aluminum Bronze 40,000 75,000 40,000 75,000 30 B70 75,000 B70
510 Phosphor Bronze 35,000 60,000 35,000 60,000 15 B60 60,000 B60
675 Manganese Bronze 22,000 55,000 22,000 55,000 20 B60 55,000 B60
655-HF Silicon Bronze 20,000 52,000 18,500 50,000 20 B60 52,000 B60
655 Silicon Bronze 38,000 70,000 36,000 68,000 15 B75 70,000 B75
651 Silicon Bronze 45,000 75,000 42,500 72,000 8 B75 75,000 B75
661 Silicon Bronze 38,000 70,000 38,000 70,000 15 B75 70,000 B75
NICU-
A-HF
Nickel-Copper
Alloy A
25,000 70,000 25,000 70,000 20 B70 70,000 B70
NICU-A Nickel-Copper
Alloy A
40,000 80,000 40,000 80,000 20 B80 80,000 B80
NICU-B Nickel-Copper
Alloy B
40,000 80,000 40,000 80,000 20 B80 80,000 B80
NICU-K(7) Nickel-Copper
Aluminum Alloy
90,000 130,000 90,000 130,000 20 C24 130,000 C24
2024-T4 Aluminum Alloy 40,000 55,000 40,000 55,000 14 B70 55,000 B70
6061-T6 Aluminum Alloy 35,000 42,000 35,000 42,000 12 B50 42,000 B50

Note: Austenitic stainless steel, strain hardened bolts, screws, studs, and nuts shall have the following strength per properties:

Product
Size

Bolts, Screws, Studs

Nuts

Tested Full Size Machine Test Specimens, Proof
Load
Stress
Yield
Strength
Tensile
Strength
Yield
Strength
Tensile
Strength
in. min psi min psi min psi min psi psi
to 5/8 in. 100,000 125,000 90,000 115,000 125,000
over 5/8 to 1 in. 70,000 105,000 65,000 100,000 105,000
over 1 to 1-1/2 in. 50,000 90,000 45,000 85,000 90,000

 

Tensile Strength

A General Guide to the Room Temperature Tensile Strength of Common Fastener Alloys*

Grade

Minimum Ultimate Tensile Strength

General Use

Carbon steels

100,000 psi to 175,000 psi

Often used for nuts

Alloy steels

100,000 psi to 180,000 psi

Used for bolts and screws

Tool steel (H-11)

Up to 260,000 psi

High strength fasteners

Austenitic stainless steels (300 series)

75,000 psi (carbide solution treated)

100,000 psi to 125,000 psi (strain hard)

Corrosion resistant fasteners

Martensitic stainless steels

(400 series)

90,000 psi to 140,000 psi

Less corrosion resistance than 300 series

Precipitation hardenable (PH) stainless steels

(17-4PH, A286)

80,000 psi to 180,000 psi

Corrosion resistance similar to 300 series stainless

PH Nickel based alloys

(Inconel 718, Inconel X750, Waspaloy)

140,000 psi to 180,000 psi
225,000 psi (hardened)

Superior corrosion resistance, elevated temperature strength

Non-HT Nickel based alloys

(Alloy 20, Inconel 600, Inconel 625, Inconel 686)

80,000 psi to 120,000 psi (annealed)

Up to 180,000 psi (strain hardened)

Corrosion resistance in severe environments

Nickel-Copper alloy

(Monel 400)

80,000 psi

Corrosion resistance in a variety of environments including seawater

Nickel-Copper-Aluminum alloy

(K-500)

160,000 psi

Corrosion resistance in a variety of environments including seawater

Cobalt based alloys

(MP35N, MP159)

Up to 260,000 psi

Superior corrosion resistance

Titanium alloys

(commercially pure;

alpha-beta alloys)

35,000 psi to 80,000 psi (annealed)

140,000 psi to 190,000 psi (hardened)

Light weight, excellent corrosion resistance

Copper based alloys

30,000 psi to 70,000 psi

Electrical conductivity, heat transfer, corrosion resistance

*Source: ASM Metals Handbook, Vol.1&2, 10th Edition.

 

Hardness Conversion Table

Brinell Hardness  Rockwell B-Scale  Rockwell C-Scale  Approximate Tensile (lbs/PSI)
653 - 62 324,000
627 - 60 311,000
601 - 59 306,000
578 - 57 290,000
578 - 57 290,000
555 - 56 284,000
534 - 54 270,000
514 - 53 263,000
495 - 51 250,000
477 - 50 243,000
461 - 49 236,000
444 - 47 223,000
429 - 47 217,000
415 - 45 211,000
401 - 42 194,000
388 - 41 188,000
375 - 40 182,000
363 - 38 171,000
352 - 37 166,000
331 - 36 162,000
321 - 34 153,000
311 - 33 148,000
302 - 32 144,000
293 - 31 140,000
285 - 30 136,000
277 - 29 132,000
269 - 28 129,000
262 - 27 126,000
255 - 25 120,000
248 - 24 117,000
241 100 23 115,000
235 99 22 112,000
229 98 21 110,000
223 97 20 108,000
217 96 - 103,000
212 96 - 103,000
207 95 - 101,000
202 94 - 98,000
197 93 - 96,000
192 92 - 93,000
187 91 - 91,000
183 90 - 89,000
179 89 - 87,000
174 88 - 85,000
170 87 - 83,000
166 86 - 81,000
163 85 - 80,000
159 84 - 78,000
156 83 - 77,000
153 82 - 76,000
149 81 - 75,000
146 80 - 74,000
143 79 - 73,000
140 78 - 71,000
137 77 - 70,000
134 76 - 69,000
131 74 - 67,000
128 73 - 66,000
126 72 - 65,000
124 71 - 63,000
121 70 - 62,000
118 69 - 61,000
116 68 - 60,000
114 67 - 59,000
112 66 - 58,000
109 65 - 57,000
107 64 - 55,000

 

The above data is given for general information purposes only and is not to be considered engineering advice. Please consult with an engineer prior to using this data.