| Bolt Diameter (mm) |
Head/Wrench Size (mm) |
|||
|---|---|---|---|---|
| ANSI/ISO | DIN | JIS | DIN/ISO Heavy Hex |
|
| 4 | 7 | 7 | 7 | – |
| 5 | 8 | 8 | 8 | – |
| 6 | 10 | 10 | 10 | – |
| 7 | – | 11 | – | – |
| 8 | 13 | 13 | 12 | – |
| 10 | 16 | 17 | 14 | – |
| 12 | 18 | 19 | 17 | 22/21* |
| 14 | 21 | 22 | 19 | – |
| 16 | 24 | 24 | 22 | 27 |
| 18 | – | 27 | – | – |
| 20 | 30 | 30 | – | 34/32* |
| ANSI – American National Standards Institute ISO – International Organization for Standardisation DIN – Deutsches Institut fur Normung JIS – Japanese Industrial Standard * Indicates ISO standard. |
||||
Tag: Hex Cap
Hex Bolt Grade Identification and Mechanical Properties
| 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 | |||
Hex Nut Dimensions
| Size | Across Flats* | Height | ||||
|---|---|---|---|---|---|---|
| Hex Nut | Machine Screw Nut | Hex Nut | Jam Nut | Nylock Nut | Machine Screw Nut | |
| 0 | – | 5/32 | – | – | – | 3/64 |
| 1 | – | 5/32 | – | – | – | 3/64 |
| 2 | – | 3/16 | – | – | 9/64 | 1/16 |
| 3 | – | 3/16 | – | – | 9/64 | 1/16 |
| 4 | – | 1/4 | – | – | 9/64 | 3/32 |
| 6 | – | 5/16 | – | – | 11/64 | 7/64 |
| 8 | – | 11/32 | – | – | 15/64 | 1/8 |
| 10 | – | 3/8 | – | – | 15/64 | 1/8 |
| 12 | – | 7/16 | – | – | 5/16 | 5/32 |
| 1/4 | 7/16 | 7/16 | 7/32 | 5/32 | 5/16 | 3/16 |
| 5/16 | 1/2 | 9/16 | 17/64 | 3/16 | 11/32 | 7/32 |
| 3/8 | 9/16 | 5/8 | 21/64 | 7/32 | 29/64 | 1/4 |
| 7/16 | 11/16 | – | 3/8 | 1/4 | 29/64 | – |
| 1/2 | 3/4 | – | 7/16 | 5/16 | 19/32 | – |
| 9/16 | 7/8 | – | 31/64 | 5/16 | 41/64 | – |
| 5/8 | 15/16 | – | 35/64 | 3/8 | 3/4 | – |
| 3/4 | 1-1/8 | – | 41/64 | 27/64 | 7/8 | – |
| 7/8 | 1-5/16 | – | 3/4 | 31/64 | 63/64 | – |
| 1 | 1-1/2 | – | 55/64 | 35/64 | 1-3/64 | – |
| * This is also the size of wrench to use. | ||||||
Hex Cap Bolt Dimensions
|
Hex Bolt Dimensions
|
||||||||
|
Basic Product Diameter
|
Full-Size Body Diameter
|
Width Across Flats
|
Width Across Corners
|
Head Height
|
Thread Length
|
Thread Length
|
||
|
Max
|
Min
|
Max
|
Min
|
Up to 6in
|
Over 6 in
|
|||
|
1/4
|
.26
|
.237
|
7/16
|
.505
|
0.484
|
11/64
|
0.75
|
1.00
|
|
5/16
|
.324
|
.298
|
1/2
|
.577
|
0.552
|
7/32
|
0.88
|
1.13
|
|
3/8
|
.388
|
.360
|
9/16
|
.650
|
0.62
|
1/4
|
1.00
|
1.25
|
|
7/16
|
.452
|
.421
|
5/8
|
.722
|
0.687
|
19/64
|
1.13
|
1.38
|
|
1/2
|
.515
|
.482
|
3/4
|
.866
|
0.826
|
11/32
|
1.25
|
1.50
|
|
5/8
|
.642
|
.605
|
15/16
|
1.083
|
1.033
|
27/64
|
1.50
|
1.75
|
|
3/4
|
.768
|
.729
|
1-1/8
|
1.299
|
1.24
|
1/2
|
1.75
|
2.00
|
|
7/8
|
.895
|
.852
|
1-5/16
|
1.516
|
1.447
|
37/64
|
2.00
|
2.25
|
|
1
|
1.022
|
.976
|
1-1/2
|
1.732
|
1.653
|
43/64
|
2.25
|
2.50
|
|
1-1/8
|
1.149
|
1.098
|
1-11/16
|
1.949
|
1.859
|
3/4
|
2.50
|
2.75
|
|
1-1/4
|
1.277
|
1.223
|
1-7/8
|
2.165
|
2.066
|
27/32
|
2.75
|
3.00
|
|
1-3/8
|
1.404
|
1.345
|
2-1/16
|
2.382
|
2.273
|
29/32
|
3.00
|
3.25
|
|
1-1/2
|
1.531
|
1.47
|
2-1/4
|
2.598
|
2.48
|
1
|
3.25
|
3.50
|
|
1-3/4
|
1.785
|
1.716
|
2-5/8
|
3.031
|
2.893
|
1-5/32
|
3.75
|
4.00
|
|
2
|
2.039
|
1.964
|
3
|
3.464
|
3.306
|
1-11/32
|
4.25
|
4.50
|
|
2-1/4
|
2.305
|
2.214
|
3-3/8
|
3.897
|
3.719
|
1-1/2
|
4.75
|
5.00
|
|
2-1/2
|
2.559
|
2.461
|
3-3/4
|
4.33
|
4.133
|
1-21/32
|
5.25
|
5.5
|
|
2-3/4
|
2.827
|
2.711
|
4-1/8
|
4.763
|
4.546
|
1-13/16
|
5.75
|
6.00
|
|
3
|
3.081
|
2.961
|
4-1/2
|
5.196
|
4.959
|
2
|
6.25
|
6.50
|
|
3-1/4
|
3.335
|
3.21
|
4-7/8
|
5.629
|
5.372
|
2-3/16
|
6.75
|
7.00
|
|
3-1/2
|
3.589
|
3.461
|
5-1/4
|
6.062
|
5.786
|
2-5/16
|
7.25
|
7.50
|
|
3-3/4
|
3.858
|
3.726
|
5-5/8
|
6.495
|
6.198
|
2-1/2
|
7.75
|
8.00
|
|
4
|
4.111
|
3.975
|
6
|
6.928
|
6.612
|
2-11/16
|
8.25
|
8.50
|