ASTM Markings On Studs Bolts Nuts
FASTENER IDENTIFICATION
MARKING -STUDS BOLTS
Identification
|
Specification |
Fastener
|
Material |
Nominal Size
|
Mechanical Properties |
||
Proof
|
Yield
|
Tensile
|
|||||
 NoGradeMark |
SAE J429
|
Bolts,
|
Low or
|
1/4 thru
|
33,000 |
36,000 |
60,000 |
ASTM A307
|
Low Carbon
|
1/4 thru 4 |
— |
— |
|||
SAE J429
|
Low or
|
1/4 thru
|
55,000
|
57,000
|
74,000
|
||
|
SAE J429
|
Studs |
Medium
|
1/4 thru
|
— |
100,000 |
115,000 |
|
ASTM A193
|
AISI 501 |
1/4 Thru 4 |
— |
80,000 |
100,000 |
|
|
ASTM A193
|
AISI 410 |
85,000 |
110,000 |
|||
|
ASTM A193
|
AISI 4140,
|
1/4 thru 2-1/2Over 2-1/2 thru 4Over 4 thru 7 |
——- |
105,000
|
125,000
|
|
|
ASTM A193
|
CrMoVa
|
105,000
|
125,000
|
|||
|
ASTM A193
|
AISI 304 |
1/4 and larger |
— |
30,000 |
75,000 |
|
|
ASTM A193
|
AISI 347 |
|||||
|
ASTM A193
|
AISI 316 |
|||||
|
ASTM A193
|
Bolts, Screws, Studs for High-Temperature Service |
AISI 321 |
1/4 and
|
— |
30,000 |
75,000 |
|
ASTM A193
|
AISI 304Strain Hardened |
1/4 thr 3/4Over 3/4 thru 1Over 1 thru 1-1/4Over 1-1/4 thru 1-1/2 |
——— |
100,000
|
125,000
|
|
|
ASTM A193
|
AISI 347Strain Hardened |
|||||
|
ASTM A193
|
AISI 316Strain Hardened |
95,000
|
110,000
|
|||
|
ASTM A193
|
AISI 321Strain Hardened |
100,000
|
125,000
|
|||
|
ASTM A320
|
Bolts, Screws, Studs for Low-Temperature Service |
AISI 4140,4142 or 4145 |
1/4 thru 2-1/2 |
— |
105,000 |
125,000 |
|
ASTM A320
|
AISI 4037 |
|||||
|
ASTM A320
|
AISI 4137 |
|||||
|
ASTM A320
|
AISI 8740 |
|||||
|
ASTM A320
|
AISI 4340 |
1/4 thru 4 |
— |
105,000 |
125,000 |
|
|
ASTM A320
|
Bolts, Screws, Studs for Low-Temperature Service |
AISI 304 |
1/4 and larger |
— |
30,000 |
75,000 |
|
ASTM A320
|
AISI 347 |
|||||
|
ASTM A320
|
AISI 321 |
|||||
|
ASTM A320
|
AISI 303or 303Se |
|||||
|
ASTM A320
|
AISI 316 |
|||||
|
ASTM A320
|
AISI 304 |
1/4 thru 3/4Over 3/4 thru 1Over 1 thru 1-1/4Over 1-1/4 thru 1-1/2 |
——— |
100,000
|
100,000
|
|
|
ASTM A320
|
AISI 347 |
|||||
|
ASTM A320
|
AISI 303or 303Se |
|||||
|
ASTM A320
|
AISI 316 |
|||||
|
ASTM A320
|
AISI 321 |
|||||
|
|
SAE J429
|
Bolts, Screws, Studs |
Medium Carbon Steel, Quenched and Tempered |
1/4 thru 1Over 1 to 1-1/2 |
85,000
|
92,000
|
120,000
|
ASTM A449 |
1/4 thru 1Over 1 to 1-1/2Over 1-1/2 thru 3 |
85,000
|
92,000
|
120,000
|
|||
|
|
SAE J429
|
Sems |
Low or
|
No. 6thru 3/8 |
85,000 |
— |
120,000 |
|
|
SAE J429
|
Bolts, Screws, Studs |
Low Carbon
|
1/4 thru 1 |
85,000 |
92,000 |
120,000 |
|
ASTM A325
|
High Strength Structural Bolts |
Medium
|
1/2 thru 1
|
85,000
|
92,000
|
120,000
|
|
ASTM A325
|
Low Carbon
|
1/2 thru 1 |
85,000 |
92,000 |
120,000 |
|
|
ASTM A325
|
Atmospheric
|
1/2 thru 1
|
85,000
|
92,000
|
120,000
|
|
|
ASTM A354
|
Bolts, Studs |
Alloy Steel, Quenched and Tempered |
1/4 thru 2-1/2
|
80,000
|
83,000
|
105,000
|
|
ASTM A354
|
105,000
|
109,000
|
125,000
|
|||
|
|
SAE J429
|
Bolts, Screws |
Medium
|
1/4 thru
|
105,000 |
115,000 |
133,000 |
|
|
SAE J429Grade 8 |
Bolts, Screws, Studs |
Medium
|
1/4 thru 1-1/2 |
120,000 |
130,000 |
150,000 |
ASTM A354
|
Alloy
|
||||||
|
SAE J429
|
Studs |
Medium
|
1/4 thru
|
120,000 |
130,000 |
150,000 |
|
ASTM A490 |
High
|
Alloy
|
1/2 thru
|
120,000 |
130,000 |
150,000
|
|
ISO R898
|
Bolts, Screws, Studs |
Medium Carbon Steel, Quenched and Tempered |
All Sizes
|
33,000 |
36,000 |
60,000 |
|
ISO R898
|
55,000 |
57,000 |
74,000 |
|||
8.8
|
ISO R898
|
Alloy Steel, Quenched and Tempered |
85,000 |
92,000 |
120,000 |
||
10.9
|
ISO R898
|
120,000 |
130,000 |
150,000 |
|||
BB
BC
FASTENER IDENTIFICATION
MARKING -NUTS
| 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 non plated 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.
- Hardness numbers 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.