Grade 8 vs 10.9 High Tensile bolts
CARBON STEEL BOLTING PROPERTY CLASSES 8.8 10.9 12.9 & 14.9
CLASSES 8.8 10.9 12.9 & 14.9 grade are stipulated in various international standards including DIN 267 and ISO 898. The symbol for the property classes of hex bolts, screws and studs consists of two numbers separated by a decimal point. 8.8, 10.9, 12.9, 14.9 etc.
Hex bolts, stud bolt, threaded rod and screws property classes is consists of two numbers which can be separated by a decimal point such as 8.8, 10.9, 12.9, and 14.9. To calculate the nominal tensile strength multiply the whole number before the decimal point by a hundred in newtons per millimeter squared.
Difference Between
Grade 8 bolt
Gr 8 bolt capability in yield (stretch) = 130,000 lbs / in2 x .03349 in2 = 4354 lbs minimum
High tensile Grade 8 bolt capability in tension (failure) = 150,000 lbs / in2 x .03349 in2 = 5024 lbs minimum
Grade 8 hex bolts have 6 marks on the head.
tensile strength is 150,000 lbs per square inch
ultimate shear strength
Grade 5 bolt
Gr 5 Hex bolt capability in yield (stretch) = 92,000 lbs / in2 x .03349 in2 =
3081 lbs minimum
Grade 5 hex bolt capability in tension (failure) = 120,000 lbs / in2 x .03349 in2 =
4019 lbs minimum
Grade 10.9 bolt
HT bolts Grade 10.9 are manufactured using medium carbon steel, medium carbon steel alloy and low carbon boron steel that has been quenched and tempered.
din 6914 grade 10.9 bolts meet ASTM A324 grade BD and SAE J429,
metric grade 10.9 bolts in a wide range of standard, coarse and fine sizes
Due to space and time limitations, here is a chart showing you the tension and shear minimum capabilities of different grade fasteners relative to their size.
Internationally, mechanical stress is expressed in newtons per square area, in bolting N/mm2. Common practise overseas is to use the unit megapascal (MPa), which corresponds directly to N/mm2.
For example 1,200 N/mm2 = 1,200 MPa
An example using a hex bolt with property class 10.9
- The Nominal tensile strength of a 10.9 bolt is calculated
10 x 100 = 1,000 N/mm2 (MPa)
- The Yield stress ratio 9 x 10 = 90%
- The Yield stress is therefore
90% of 1,000 = 900 N/mm2 (MPa)
Bolts and Studs can be supplied in Property classes
Grade 3.6
Grade 4.6
Grade 4.8
Grade 5.6
Grade 5.8
Grade 6.8
Grade 8.8
Grade 9.8
Grade 10.9
Grade 12.9
Grade 14.9
Nuts Property classes
Grade 6
Grade 8
Grade 9
Grade 10
Grade 12
Grade 14
Nuts of a higher property class can nomally be used in the place of nuts of a lower property class.
* Property classes 14.9 are not detailed in the ISO or ANSI standards.
Grade 8 Specification
Grade 8 Bolt Type
Anchor Bolt, Carriage Bolt, Flange Bolt, Hanger Bolt, Hexagon Bolt / Tap Bolt, Lag Bolt, Machine Bolt, Plow Bolt, Shoulder Bolt, Square Head Bolt, Stud Bolt, T-Head Bolt, Toggle Bolt, U-Bolt
Inch
#0000 -3" (customized sizes available)
Metric
M1.6 - M48
Length
Customized Length
Grade
Non Ferrous, Grade 12.9, 10.9, 9.8, 8.8, 5.8, 4.6, B7, 2, 5, 8, L9
Material
Brass, Bronze / Copper Base Alloy, Copper, Molybdenum, Steel, Hardened Steel, Stainless Steel, Superalloy (Inconel, Hastelloy, Monel), Titanium, Exotic Metals, Other
Method
Cold forming, Hot Forging, Wire Forming
Fastener Standards
ASME / ANSI, BS, DIN, ISO, JIS, SAE, Other
Application Industries & uses
Agriculture, Automotive, Construction and Infrastructure, Energy, Transportation
Testing Methods
ASTM E38, E76 and E354, ASTM E53, E54, E62, E75and E478, ASTM E34, E101 and E227, ASTM E 120 and E1409.
Threads Configuration
ASME B1.1 2A/3A – 2B/3B Inch Unified Threads and B1.13M 6h-6G Metric Coarse Threads
Thread Diameters
M6 to M36
Certification
Dual Certified As per ASTM & ASME Codes
Grade 8 Material Stock
- Hex Head Bolts
- Wing Bolts
- Eye Bolts
- Allen Key Bolts
- J Bolts
- Countersunk Bolts
- Stud Bolts
- Flange Head Bolts
- Anchor Bolts
- Roofing Bolts
- Torx Bolts
- Screw Thread Eye Bolt
- Deck Bolts
- Round Head Bolts
- Carriage Bolts
- Tap bolts
- Lag Bolts
- U Bolts
- Hex Bolts
- T-head bolt
- Forged Hook Bolts
- Toggle bolt
- Machine bolts
- Hanger Bolts
- Socket Button Head Bolts
- Eye Bolt With Shoulder
- Eye Bolt No Shoulder
- Square Head Bolts
- Turned Eye Bolts
- Square U-bolts
- Long Bolt
- Serrated Flange Bolts
- Shoulder bolt
- Heavy Hex Bolts
- Hex Flange Bolts
- 12-Point Flange Bolts
- Button Head Bolts
- Jack Bolts
- Bent Bolts
- Allen Bolt
- 12-Point Flange Bolts
- Carriage Bolts
- Elevator Bolts
- Hanger Bolts
- Hex Machine Bolts
- Timber Bolts
- Sex bolts
- Hexagon Bolts for Steel Structures
- Step Bolts for Steel Structures
- Hex Tap Bolts
- Hexagon Head Bolts
- Tee-Hammer Head Bolt
- Security Anti Theft Bolts
- Structural Bolts
- Hex Flange Bolt
- Metric Bolts
- Plow Bolts
- Square Head Machine Bolts
- Step Bolts
- Hex Head Bolts
- Hex Head Bolt With Plain Spring Washer
- Hexagon Head Bolts ISO 4014
- Hexagon Flange Bolts DIN 6921
- Hexagon Head Bolts ISO 4016
- DIN 976-1 Stud bolts
- High Strength Structural Bolts
The Metric System
Product Type
Metric Specification
Scope
Din
ISO
ANSI/ASME
HCS
931
4014
B18.2.3.1M
Partially Threaded
933
4017
Fully Threaded
960
8676
Partially Threaded (Fine)
961
8765
Partially Threaded (Fine)
Hex Nuts
934
4032
B18.2.4.1M (style 1)
Classes 6, 8, & 10
SHCS
912
4762
B18.3.1
BHSHCS
N/A
7380
B18.3.4M
FHSCS
N/A
7991
B18.3.5
Metric Stainless Steel Fasteners
Steel Composition
Alloy Group
Property Class
#
Steel Type
#
Minimum Tensile Strength in MPa1
A
Austenitic
1
18-82
50
500 (soft)
2
18-83
70
700 (cold-worked)
4
316
80
800 (high strength)
F
Ferritic
1
430
45
450 (soft)
60
600 (cold-worked)
C
Martensitic
1
410
50
500 (soft)
4
416,416Se
70
700 (hardened and tempered)
1104
1100 (hardened and tempered)
3
431
80
800 (hardened and tempered)
1205
1200 (hardened and tempered)
P6
Precipitation-Hardening
1
630 (17/4)
90
900
- 1 If it is a stainless nut, then this number will indicate the Nut Proof Stress rather than the Minimum Tensile Strength.
- 2 Specifics vary based on specification used. ISO alloy group 1 for austenitic indicates 18-8 with sulfur added for machining. ASTM alloy group 1 austenitic may indicate 304, 304L, 305, 384, or XM7. At customer request, 303, 303Se, or XM1 may be used.
- 3 Specifics vary based on specification used. ISO alloy group 2 for austenitic indicates 18-8. ASTM alloy group 2 austenitic will consist of 321 or 347.
- 4 C1-110 & C4-110 apply to ASTM metric only.
- 5 C3-120 applies to ASTM metric only.
- 6 Precipitation-Hardening stainless steel applies to ASTM metric only.
Mechanical Properties
Property
3.6
4.6
4.8
5.6
5.8
6.8
8.8
10.9
12.9
<= 16mm
> 16mm
Tensile Strength
Rm in MPa (N/mm2)
nominal value
300
400
400
500
500
600
800
800
1000
1200
minimum
330
400
420
500
520
600
800
830
1040
1220
Vickers Hardness
HV=F 98N
minimum
95
120
130
155
160
190
230
255
310
372
maximum
220
220
220
220
220
250
300
336
382
434
Brinell Hardness
HB F=30D2
minimum
90
114
124
147
152
181
219
242
295
353
maximum
209
238
285
319
363
412
Rockwell Hardness HR
minimum HRB
52
67
71
79
82
89
minimum HRC
20
23
31
38
maximum HRB
95
95
95
95
95
maximum HRC
30
34
39
44
Surface Hardness
HV 0.3
maximum
320
356
402
454
Yield Stress
Rel in MPa(N/mm2)
nominal value
180
240
320
300
400
480
minimum
190
240
340
300
420
480
0.2% elongation limit
Rp0.2
in Mpa (N/mm2)
nominal value
640
640
900
1080
minimum
640
660
940
1100
Test stress Sp
Sp/ReL or Rp0.2
0.94
0.94
0.91
0.94
0.91
0.91
0.91
0.91
0.88
0.88
MPA (N/mm2)
180
225
310
280
380
440
580
600
830
970
Elongation after fracture
A5 in %
minimum
25
22
14
20
10
8
12
12
9
8
Minimum notch impact energy in Joules
25
30
30
20
15
Head Impact Toughness
No Fracture
Maximum Height of the Thread Zone Not
Decarburized E
1/2H1
1/2H1
2/3H1
3/4H1
Maximum Depth of Decarburization Gmm
.015
.015
.015
.015
Mechanical Properties for Socket Products
DIN 912 Socket Cap Screws
Property Class
12.9
Hardness (HRC)
39-44
Tensile Strength (Mpa)
1,220 min.
Yield Strength at 0.2% Offset (Mpa)
1,100 min.
Elongation (%)
8 min.
DIN 7984 Low Head Socket Caps
Property Class
10.9
Hardness (HRC)
32-39
Tensile Strength (Mpa)
832 min.
DIN 7991 Flat Head Countersunk Socket Cap Screws
Property Class
10.9
Hardness (HRC)
32-39
Tensile Strength (Mpa)
835 min.
ISO 7380 Button Head Socket Cap Screws
Property Class
10.9
Hardness (HRC)
32-39
Tensile Strength (Mpa)
835 min.
ISO 7379 Socket Shoulder Screws
Property Class
12.9
Hardness (HRC)
39-44
Tensile Strength (Mpa)
1,100 min.
DIN 916 Set Screws
Property Class
45H
Hardness (HRC)
45-53
ASME B18.3 Socket Cap Screws
Diameter d
d <= 1/2
d > 1/2
Hardness (HRC)
39-44
37-44
Tensile Strength (psi)
145,000 min.
135,000 min.
ASME B18.3 Low Head Socket Caps
Diameter d
d <= 1/2
d > 1/2
Hardness (HRC)
39-45
37-45
Tensile Strength (psi)
180,000 min.
170,000 min.
Yield Strength at 0.2% Offset (psi)
153,000 min.
153,000 min.
Elongation (%)
10 min.
10 min.
ASME B18.3 Flat Head Countersunk Socket Cap Screws
Diameter d
d <= 1/2
d > 1/2
Hardness (HRC)
39-44
37-44
Tensile Strength (psi)
145,000 min.
135,000 min.
ASME B18.3 Button Head Socket Cap Screws
Diameter d
d <= 1/2
d > 1/2
Hardness (HRC)
39-44
37-44
Tensile Strength (psi)
145,000 min.
135,000 min.
ASME B18.3 Socket Shoulder Screws
Hardness (HRC)
39-43
Tensile Strength (psi)
140,000 min.
ASME B18.3 Set Screws
Property Class
45H
Hardness (HRC)
45-53
Mechanical Properties for Hex Products
ISO 4014 / 4017 Hex Head Bolts
Property Class
10.9
12.9
Hardness (HRC)
32-39
39-44
Tensile Strength (Mpa)
1,040 min.
1,220 min.
Yield Strength at 0.2% Offset (Mpa)
940 min.
1,100 min.
Elongation (%)
9 min.
8 min.
ISO 4162 Hexagon Flange Bolts
Property Class
10.9
12.9
Hardness (HRC)
32-39
39-44
Tensile Strength (Mpa)
1,040 min.
1,220 min.
Yield Strength at 0.2% Offset (Mpa)
940 min.
1,100 min.
Elongation (%)
9 min.
8 min.
ASME B18.2.1 Hexagon Head Cap Screws
Property Class
SAE J429-Grade 8
Hardness (HRC)
33-39
Surface Hardness (30N)
58.6 max.
Tensile Strength (psi)
150,000 min.
Yield Strength at 0.2% Offset (psi)
130,000 min.
Elongation (%)
12 min.
IFI-111 Hexagon Flange Screws
Property Class
SAE J429-Grade 8
Hardness (HRC)
33-39
Surface Hardness (30N)
58.6 max.
Tensile Strength (psi)
150,000 min.
Yield Strength at 0.2% Offset (psi)
130,000 min.
Elongation (%)
12 min.
Grade 8 Bolts stockist in India- ASME, DIN, AS, BS
*All information is strictly informative
Grade 8 Bolts Coatings and plating as well as plain finished oil and tempered is available as required by the end user such as Zinc plating, Cadmium plating, Xylan ® coating, Dupont Teflon ® coating, Hot Dip Galvanized coating, Auge Antifrix ® coating, Sermagard ® coating and Niwat 1000 ® plating.
Available standard: DIN 934, ISO 4033, ISO 4032, DIN 935,DIN 936, ASME B18.2.2, ASME B18.2.4.6M, DIN 976, DIN 975, DIN 2510, DIN 939, DIN 940, DIN 938
Specialized in Aircraft Materials & Aerospace Materials