Bolt Head Marking Chart

Identification
Grade Mark		 Specifications Material Normal Size
Dia. In		 Proof Load
PSI
(Mpa)		 Tensile Strength
Min. PSI
(Mpa)		 Yield Strength
Min. PSI		 Bolt Rockwell
Hardness		 Nut Rockwell
Hardness
Min Max Min Max
  SAE J429
Grade 1		 Low Carbon Steel 1/4″ – 1 1/4″ 33.000 60.000 36,000 B70 B100    
SAE J429
Grade 2		 1/4 ” –  3/4″
3/4″ – 1 1/2″		 55.000
33.000		 60.000
74.000		 57.000
36.000		 B80 B100   C32
  Property
 Class 5.8		 Low or Medium
Carbon Steel		 M5 – M24 55.100
(380)		 75.400
(520)		   B82 B95   C32
  SAE J429
Grade 5		 Medium Carbon Steel, Quenched and Tempered 1/4 – 1
1″ – 1-1/2″		 85,000
74,000		 120,000
105,000		 92,000
81,000		 C25
C19		 C34
C30		   C32
ASTM A449 1/4″ – 1″
1″ – 1-1/2
 1-1/2″ – 3″		 85,000
74,000
55,000		 120,000
105,000
90,000		 92,000
81,000
58,000		    
  SAE J429
Grade 5.1		 Low or Medium Carbon Steel, Quenched and Tempered No. 6
thru 3/8		 85,000 120,000   C25 C40    
  SAE J429
Grade 5.2		 Low Carbon Martensitic Steel, Quenched and Tempered 1/4 thru 1 85,000 120,000 92,000        
  ASTM A325
Type 1		 Medium Carbon Steel, Quenched and Tempered 1/2 thru 1
1-1/8 thru 1-1/2		 85,000
74,000		 120,000
105,000		 92,000
81,000		        
A325 ASTM A325
Type 2		 Low Carbon Martensitic Steel, Quenched and Tempered 1/2 thru 1 85,000 120,000 92,000        
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		 120,000
105,000		 92,000
81,000		        
Identification
Grade Mark		 Specifications Material Normal Size
Dia. In		 Proof Load
PSI
(Mpa)		 Tensile Strength
Min. PSI
(Mpa)		 Yield Strength
Min. PSI		 Bolt Rockwell
Hardness		 Nut Rockwell
Hardness
Min Max Min Max
BB ASTM A354
Grade BB		 Alloy Steel, Quenched and Tempered 1/4 thru 2-1/2
2-3/4 thru 4		 80,000
75,000		 105,000
100,000		 83,000
78,000		        
BC ASTM A354
Grade BC		 105,000
95,000		 125,000
115,000		 109,000
99,000		        
  Property
Class 9.8		 Medium carbon steel, Quenched & tempered M1.6 – M16 94.250
(650)		 130.500
(900)		   C27 C36   C32
  SAE J429
Grade 7		 Medium Carbon Alloy Steel, Quenched and Tempered 1/4 thru 1-1/2 105,000 133,000 115,000        
  SAE J429
Grade 8		 Medium Carbon Alloy Steel, Quenched and Tempered 1/4 thru 1-1/2 120,000 150,000 130,000        
ASTM A354
Grade BD		 Alloy Steel, Quenched and Tempered
No Grade
Mark		 SAE J429
Grade 8.1		 Medium Carbon Alloy or SAE 1041 Modified Elevated Temperature Drawn Steel 1/4 thru 1-1/2 120,000 150,000 130,000        
  SAE
Grade 8.2		 Low carbon boron martensite steel
fully killed fine grain quenched & tempered		 1/4″ – 1″ 120.000 150.000   C35 C42    
Identification
Grade Mark		 Specifications Material Normal Size
Dia. In		 Proof Load
PSI
(Mpa)		 Tensile Strength
Min. PSI
(Mpa)		 Yield Strength
Min. PSI		 Bolt Rockwell
Hardness		 Nut Rockwell
Hardness
Min Max Min Max
A490 ASTM A490 Alloy Steel, Quenched and Tempered 1/2 thru 1-1/2 120,000 150,000 min
170,000 max		 130,000        
No Grade
Mark		 ISO R898
Class 4.6		 Medium Carbon Steel, Quenched and Tempered All Sizes
thru 1-1/2		 33,000 60,000 36,000        
No Grade
Mark		 ISO R898
Class 5.8		 55,000 74,000 57,000        
8.8 or 88 ISO R898
Class 8.8		 Alloy Steel, Quenched and Tempered All Sizes
thru 1-1/2		 85,000 120,000 92,000        
10.9 or 109 ISO R898
Class 10.9		 Alloy Steel, Quenched and Tempered All Sizes
thru 1-1/2		 120,000 150,000 130,000        
  Property
Class 10.9		 Medium carbon alloy steel
quenched & tempered		 M6 – M36 120.350
(830)		 150.800
(1040)		   C33 C39 C26 C36
  Property
Class 12.9		 Medium carbon alloy steel
quenched & tempered		 M1.6 – M36 140.000
(970)		 176.900
(1220)		   C38 C44 C26 C36

Mechanical
Mechanical Properties Of Fasteners

CLASS New Designation 4.6 4.8 5.6 5.8 6.6 6.8 6.9 8.8 10.9 12.9 14.9
Formerly 4D 4S 5D 5S 6D 6S 6G 8G 10K 12K —
U.S. GRADE 1 2 2 2 3 3 3 5 8 — —
Brinell
min.
max.
110
170
140
215
170
245
225
300
280
365
330
425
390
—
Rockwell  
min.
max.
63
88
78
97
88
102
—
—
—
—
—
—
—
—
 
min.
max.
     
18
31
27
38
34
44
40
49
Yield Point psi 45,000 56,000 76,000 76,000 91,000 128,000 153,000 180,000
Tensile
Strength psi
min.
max.
56,000
78,000
70,000
100,000
85,000
113,000
85,338
99,561
113,784
128,000
142,230
170,676
170,000
200,000
200,000
230,000

Cap Screws
Hex Cap Screws

   
Nominal
Or Basic Product Dia.		 E F G H R LT
Body Diameter Width Across Flats Width
Across
Corners		 Head Height Radius of Fillet Thread Lngth.
For Screw Lengths < 6 In. For Screw Lengths > 6 In.
  Max. Min. Basic Max. Min. Max. Min. Basic Max. Min Min. Basic Basic
1/4 0.2500
5/16 0.3125
3/8 0.3750
7/16 0.4375
0.2500
0.3125
0.3750
0.4375		 0.2450
0.3065
0.3690
0.4305		 7/16
1/2
9/16
5/8		 0.438
0.500
0.562
0.625		 0.428
0.489
0.551
0.612		 0.505
0.577
0.650
0.722		 0.488
0.557
0.628
0.698		 5/32
13/64
15/64
9/32		 0.163
0.211
0.243
0.291		 0.150
0.195
0.226
0.272		 0.015
0.015
0.015
0.015		 0.750
0.875 1.000 1.125		 1.000
1.125
1.250
1.375
1/2 0.5000
9/16 0.5625
5/8 0.6250
3/4 0.7500
0.5000
0.5625
0.6250
0.7500		 0.4930
0.5545
0.6170
0.7410		 3/4
13/16
15/16
1-1/8		 0.750
0.812
0.938
1.125		 0.736
0.798
0.922
1.100		 0.866
0.938
1.083
1.299		 0.840
0.910
1.051
1.254		 5/16
23/64
25/64
15/32		 0.323
0.371
0.403
0.483		 0.302
0.348
0.378
0.455		 0.015
0.020
0.020
0.020		 1.250
1.375
1.500
1.750		 1.500
1.625
1.750
2.000
7/8 0.8750
1 1.0000
1-1/8 1.1250
1-1/4 1.250
0.8750
1.0000
1.1250
1.2500		 0.8660
0.9900
1.1140
1.2390		 1-5/16
1-1/2
1-11/16
1-7/8		 1.312
1.500
1.688
1.875		 1.285
1.469
1.631
1.812		 1.516
1.732
1.949
2.165		 1.465
1.675
1.859
2.066		 35/64
39/64
11/16
25/32		 0.563
0.627
0.718
0.813		 0.531
0.591
0.658
0.749		 0.040
0.060
0.060
0.060		 2.000
2.250
2.500
2.750		 2.250
2.500
2.750
3.000
1-3/8 1.3750
1-1/2 1.5000
1.3750
1.5000		 1.3630
1.4880		 2-1/6
2-1/4		 2.062
2.250		 1.994
2.175		 2.382
2.598		 2.273
2.480		 27/32
15/16		 0.878
0.974		 0.810
0.902		 0.060
0.060		 3.000
3.250		 3.250
3.500

Grade 8 Alloy
Reliant Frame Bolts Grade 8 Alloy

 
Nominal
Size Or Basic Major Dia. Of Thread		 E F G B U H LT
Body Dia. Width Across Flats Width
Across
Corners		 Flange
Dia.		 Flange Thickness Head Height Thread Lngth.
L<6 In. L>6 In.
  Max. Min. Basic Max. Min. Max. Min. Max. Min. Max. Min. Basic
3/8 0.3750
1/2 0.5000
5/8 0.6250
3/4 0.7500
0.3750
0.5000
0.6250
0.7500		 0.3690
0.4930
0.6170
0.7410		 9/16
3/4
15/16
1-1/8		 0.5625
0.7500
0.9375
1.1250		 0.551
0.736
0.922
1.100		 0.650
0.866
1.083
1.299		 0.618
0.825
1.034
1.234		 0.81
1.07
1.33
1.59		 0.06
0.08
0.10
0.11		 0.39
0.51
0.62
0.73		 0.25
0.34
0.42
0.51		 1.000
1.250 1.500 1.750		 1.250
1.500
1.750
2.000