|
Identification
Grade Mark |
Specification |
Fastener
Description |
Material |
Nominal Size
Range (in.) |
Mechanical Properties |
|
Proof Load
(psi) |
Yield Strength
Min (psi) |
Tensile Strength
Min (psi) |
|
No
Grade
Mark
|
SAE J429
Grade 1 |
Bolts,
Screws,
Studs |
Low or Medium Carbon Steel |
1/4 thru 1-1/2 |
33,000 |
36,000 |
60,000 |
|
ASTM A307
Grades A&B |
Low Carbon Steel |
1/4 thru 4 |
-- |
-- |
|
SAE J429
Grade 2 |
Low or Medium Carbon Steel |
1/4 thru 3/4 Over 3/4 to 1-1/2 |
55,000
33,000 |
57,000
36,000 |
74,000
60,000 |
|
No
Grade
Mark
|
SAE J429
Grade 4 |
Studs |
Medium Carbon Cold Drawn Steel |
1/4 thru 1-1/2 |
-- |
100,000 |
115,000 |
|
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 thr 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 |
|
No Grade
Mark
|
ISO R898
Class 4.6 |
Bolts,
Screws,
Studs |
Medium Carbon Steel, Quenched and Tempered |
All Sizes
thru 1-1/2 |
33,000 |
36,000 |
60,000 |
|
No Grade
Mark
|
ISO R898
Class 5.8 |
55,000 |
57,000 |
74,000 |
|
8.8
or
88 |
ISO R898
Class 8.8 |
Alloy Steel, Quenched and Tempered |
85,000 |
92,000 |
120,000 |
|
10.9
or
109 |
ISO R898
Class 10.9 |
120,000 |
130,000 |
150,000 |
FASTENER IDENTIFICATION MARKING
|
Grade
Identification
Marking |
Specification |
Material |
Nominal Size
In. |
Proof
Load
Stress
ksi |
Hardness
Rockwell |
See
Note |
|
Min |
Max |
|
No Mark
|
ASTM A563 - Grade 0 |
Carbon Steel |
1/4 thru 1-1/2 |
69 |
B55 |
C32 |
3,4 |
|
ASTM A563 - Grade A |
Carbon Steel |
1/4 thru 1-1/2 |
90 |
B68 |
C32 |
3,4 |
|
ASTM A563 - Grade B |
Carbon Steel |
1/4 thru 1 |
120 |
B69 |
C32 |
3,4 |
|
over 1 thru 1-1/2 |
105 |
|
|
ASTM A563 - Grade C |
Carbon Steel
May be Quenched
and Tampered |
1/4 thru 4 |
144 |
B78 |
C38 |
5 |
|
|
ASTM A563 - Grade C3 |
Atmospheric
Corrosion
Resistant Steel
May be Quenched
and Tampered |
1/4 thru 4 |
144 |
B78 |
C38 |
5,9 |
|
|
ASTM A563 - Grade D |
Carbon Steel
May be Quenched
and Tampered |
1/4 thru 4 |
150 |
B84 |
C38 |
6 |
|
|
ASTM A563 - Grade DH |
Carbon Steel
Quenched
and Tampered |
1/4 thru 4 |
175 |
C24 |
C38 |
6 |
|
|
ASTM A563 - Grade DH3 |
Atmospheric
Corrosion
Resistant Steel,
Quenched
and Tampered |
1/4 thru 4 |
175 |
C24 |
C38 |
5,9 |
|
|
ASTM A194 - Grade 1 |
Carbon Steel |
1/4 thru 4 |
130 |
B70 |
-- |
7 |
|
|
ASTM A194 - Grade 2 |
Medium Carbon
Steel |
1/4 thru 4 |
150 |
159 |
352 |
7,8 |
|
|
ASTM A194 - Grade 2H |
Medium Carbon
Steel, Quenched
and Tempered |
1/4 thru 4 |
175 |
C24 |
C38 |
7 |
|
|
ASTM A194 - Grade 2HM |
Medium Carbon
Steel, Quenched
and Tempered |
1/4 thru 4 |
150 |
159 |
237 |
7,8 |
|
|
ASTM A194 - Grade 4 |
Medium Carbon
Alloy Steel,
Quenched
and Tempered |
1/4 thru 4 |
175 |
C24 |
C38 |
7 |
|
|
ASTM A194 - Grade 7 |
Medium Carbon
Alloy Steel,
Quenched
and Tempered |
1/4 thru 4 |
175 |
C24 |
C38 |
7 |
|
|
ASTM A194 - Grade 7M |
Medium Carbon
Alloy Steel,
Quenched
and Tempered |
1/4 thru 4 |
150 |
159 |
237 |
7 |
|
See Note 1,2 |
10 |
|
|
|
|
|
|
NOTES:
-
In addition to the indicated grade marking, all grades, except A563 grades O, A and B, must be marked for manufacturer identification.
-
The markings shown for all grades of A194 nuts are for cold formed and hot forged nuts. When nuts are machined from bar stock the nut must be additionally marked with the letter 'B'.
-
Nuts are not required to be marked unless specified by the purchaser. When marked, the identification marking shall be the grade letter O, A or B.
-
Properties shown are those of nonplated or noncoated coarse thread hex nuts.
-
Properties shown are those of coarse thread heavy hex nuts.
-
Properties shown are those of coarse thread heavy hex nuts.
-
Properties shown are those of coarse 8-pitch thread heavy hex nuts.
-
Hardnesses are Brinell Hardness Numbers.
-
The nut manufacturer, at his option, may add other markings to indicate the use of atmospheric corrosion resistant steel.
-
Specifications --
ASTM A563 -- Carbon and Alloy Steel Nuts.
ASTM A194/A194M -- Carbon and Alloy Steel Nuts for Bolts for High Pressure and High Temperature Service.
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