Portland Bolt Logo Part
Home > Technical Information > Fastener Identification Markings

Fastener Identification Markings
Bolt Strength Requirements

Grade Marking Specification Material and Treatment Nominal Size (In.) Mechanical Properties Hardness Rockwell
Proof
Load
Min
(ksi)
Yield
Strength
Min
(ksi)
Tensile
Strength
Min
(ksi)
Elong % Min [9] RA % Min [10] Min Max
SAE J429 Grade 1 SAE J429
Grade 1
Low or Medium Carbon Steel 14" - 112" 33 36 60 18 35 B70 B100
A307 Grade A A307
Grade A
14" - 4" - - 60 18 - B69 B100
A307 Grade B A307
Grade B
- - 60 min
100 max
18 - B69 B95
A307 Grade C
One End Green
A307
Grade C
[7]
- 36 58 min
80 max
23 - - -
F1554 Grade 36
One End Blue
F1554
Grade 36
- 36 58 min
80 max
23 40 - -
F1554 Grade 55
One End Yellow
F1554
Grade 55
14" - 2" - 55 75 min
95 max
21 30 - -
214"- 212" 21 22
234" - 3" 21 20
314" - 4" 21 18
SAE J429 Grade 2 SAE J429
Grade 2 [8]
14" - 34"

78" - 112"
55

33
57

36
74

60
18

18
35 B80

B70
B100

B100
A193/A320 Grade B8 A193/A320
Grade B8
Class 1
AISI SS304 Stainless No Restrictions - 30 75 30 50 - B96
A193/A320 Grade B8M A193/A320
Grade B8M
AISI SS316 Stainless Steel
A325 Type 1 A325
Type 1
Medium Carbon Steel, Q & T 12" - 1"

118" - 112"
85

74
92

81
120

105
14 35 C24

C19
C35

C31
A325 Type 3 A325
Type 3
Atmospheric Corrosion Resistant Steel,
Q & T
SAE J429 Grade 5 SAE J429
Grade 5
Medium Carbon Steel, Q & T 14" - 1"

118" - 112"
85

74
92

81
120

105
14 35 C25

C19
C34

C30
A449 Type 1  A449
Type 1
14" - 1"

118" - 112"

158" - 3"
85

74

55
92

81

58
120

105

90
14 35 C25

C19

B91
C34

C30

B100
A449 Type 3  A449
Type 3
Weathering Steel, Q & T 14" - 1"

118" - 112"

158" - 3"
85

74

55
92

81

58
120

105

90
14 35 C25

C19

B91
C34

C30

B100
A193 Grade B7 A193
Grade B7
Medium Carbon Alloy Steel,
Q & T
14" - 212"

258" - 4"

418" - 7"
- 105

95

75
125

115

100
16

16

18
50

50

50
- C35

C35

C35
A354 Grade BC A354
Grade BC
14" - 212"

258" - 4"
105

95
109

94
125

115
16

16
50

45
C26

C22
C36

C33
F1554 Grade 105
One End Red
F1554
Grade 105
14" - 3" - 105 125 min
150 max
15 45 - -
A320 Grade L7 A320
Grade L7
AISI 4140, 4142, or 4145 14" - 212" - 105 125 16 50 - -
A320 Grade L43 A320
Grade L43
AISI 4340 14" - 4" - 105 125 16 50 - -
A490 Type 1 A490
Type 1
Medium Carbon Alloy Steel,
Q & T
12" - 112" 120 130 150 min
173 max
14 40 C33 C38
A490 Type 3 A490
Type 3
Atmospheric Corrosion Resistant Steel,
Q & T
SAE J429 Grade 8 SAE J429
Grade 8
Medium Carbon Alloy Steel,
Q & T
14" - 112" 120 130 150 12 35 C33 C39
A354 Grade BD A354
Grade BD
[6]
14" - 212"

258" - 4"
120

105
130

115
150

140
14 40 C33

C31
C39

C39
  1. All specifications are ASTM unless otherwise noted.
  2. All specifications shall be marked by the manufacturer with a unique identifier to identify the manufacturer or private label distributor, as appropriate.
  3. Q & T - Quenched and Tempered.
  4. Although markings are shown on hex heads, stamping is a requirement on one end of rods and studs. The exception is F1554 and A307 grade C in which stamping is a supplemental requirement while color coding is required.
  5. Although markings are shown on hex heads, grade markings apply equally to products with other head configurations.
  6. All Grade BD products shall be marked "BD". In addition to the "BD" marking, the product may be marked with 6 radial lines 60° apart.
  7. ASTM A307 grade C has been replaced by ASTM F1554 grade 36.
  8. Grade 2 requirements for diameters ranging from 1/4" through 3/4" only apply to headed fasteners up to and including 6" in length, and to studs of all lengths. For headed fasteners longer than 6", see SAE J429 grade 1.
  9. Percent Elongation
  10. Percent Reduction of Area
"-" = no requirement.