High Tensile Grade 8.8 is the structural class commonly used for bolt manufacturing. It offers high tensile strength with good ductility. At Unifit Fastener, we produce Grade 8.8 hex bolts and related fasteners in a range of coatings to suit service conditions. Grade 8.8 is based on medium carbon steel; structural bolts to AS 1252 are typically quenched and tempered. We supply across India and export worldwide for applications that use Class 8.8 studs. These 8.8 bolts perform reliably in demanding environments. Custom sizes and finishes are available across our High Tensile Grade 8.8 fasteners line.
Our HT Class 8.8 nuts see use in rail systems, processing equipment, and motor/automotive assemblies. A trained team oversees production, using modern machinery to manufacture BS 3692 Grade 8.8 hex bolts with tight dimensional control, helping us meet delivery schedules. We maintain large stocks, including M20 Grade 8.8 galvanised bolts, enabling quick dispatch based on order size and availability.
We follow relevant industrial and international standards when producing ASME SA324 8.8 stainless steel bolts. Each batch is checked and certified. Products are packed securely, often in wooden cases, to prevent transit damage.
Request QuoteHigh Tensile Grade 8.8 Bolts and M20 Class 8.8 Studs Manufacturer in India
EN 15048 Grade 8.8 covers non-preloaded structural bolt assemblies made to this specification. Unifit Fastener is a leading manufacturer and supplier of Grade 8.8 bolts in multiple standards and dimensions. Class 8.8 bolts are supplied passivated or plain, per project requirement. For DIN 933 Grade 8.8 standard bolts, we offer finishes such as hot-dip galvanised, zinc plated, brass plated, and plain oiled. Metric coverage includes M2 to M100, and for select BS 3692 Grade 8.8 series we stock M3 to M60. Lengths run 6 mm to 500 mm. Head and form options include hex, square, oval, and specials.
As a manufacturer and supplier, Unifit maintains ready inventory of metric Grade 8.8 bolts for sale to support fast dispatch. Applications for 8.8 galvanised bolts and related types span nuclear power, automotive, construction, wind power, and electronics. Railway projects often specify 8.8 stainless steel bolts. The blend of strength, corrosion resistance, hardness, and broad availability makes 8.8 high tensile bolts a dependable choice across industries.
Contact Unifit Fastener for specifications, sizes, finishes, and pricing on the full range of EN 15048 Grade 8.8 bolts.
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EN 15048 Grade 8.8 Bolt Material
EN 15048 Grade 8.8 covers non-preloaded structural bolt assemblies made to this standard. We supply class 8.8 bolts in multiple sizes and specifications. Surface options include passivated or plain to match service needs.
High Tensile Grade 8.8 Bolts
High Tensile Grade 8.8 Bolts
Grade 8.8 studs
Grade 8.8 studs
For DIN 933 Grade 8.8 standard bolts, finishes include hot-dip galvanised, zinc plated, brass plated, and plain. Size coverage runs M2 to M100, and for select BS 3692 Grade 8.8 series we stock M3 to M60. Lengths span 6 mm to 500 mm. Head shapes include square, hex, oval, and specials.
As a manufacturer and supplier, we maintain steady inventory of metric Grade 8.8 bolts for quick dispatch. These 8.8 galvanised bolts and related types are used in nuclear power, automotive, construction, wind power, and electronics. A notable use case is railway, where 8.8 stainless steel bolts are often specified. The combination of strength, hardness, corrosion performance, and broad availability makes 8.8 high tensile bolts a dependable choice.
High Tensile Bolt Grade 8.8 Specification
Review Grade 8.8 bolt specs for grade, thread, material, and finish. This ensures the high tensile bolt you buy matches load and environment.
| Grade 8.8 Bolts Grades | Grade 8.8 |
|---|---|
| En 15048 Grade 8.8 Size | Dia M 20 to 100 mm Inch 3/4" to 3.1/2" |
| 8.8 High Tensile Bolts Standard | ASTM A324, ASME SA324 |
| Grade 8.8 Fasteners finish | Zinc plated / Plain / Hot dip galvanised |
Types Of Din 933 Grade 8.8 Bolts
Browse DIN 933 Grade 8.8 types like hex bolt, flange, and set screw. Pick the head style and drive that fit your assembly and torque method.
Grade 8.8 Black Bolts
Grade 8.8 Bzp Bolts
Grade 8.8 Eye Bolt
8.8 Grade Foundation Bolt
M20 Grade 8.8 Galvanised Bolts
Grade 8.8 Hex Bolt
M30 Bolt Grade 8.8
M20 Bolt Grade 8.8
Grade 8.8 Bolt Nut
Grade 8.8 U Bolt
0mm Grade 8.8 Bolt
Grade 8.8 Stud Bolts
Material Equivalent of Grade 8.8 Bolt
See Grade 8.8 bolt material equivalents across ISO, DIN, and ASTM. Use this cross-ref to match standards in mixed-spec projects.
| Diameter Ranges | Grade Of Metric | Approx. ASTM Equivalent | Description | Tensile, minimum | Yield, minimum | ||
|---|---|---|---|---|---|---|---|
| Mpa | ksi | Mpa | ksi | ||||
| All | 4.6 | A307A | Low or medium carbon steel (cs) | 400 | 58 | 240 | 35 |
| through 1" (M24) | 5.8 | - | Cold worked low or medium carbon steel | 520 | 75 | 420 | 61 |
| through 1" (M24) | 8.8 | A449 | Heat treated medium carbon steel | 830 | 120 | 660 | 96 |
| above 1" (M24) | 8.8 | A193B7/A354BC or F1554G105 | Heat treated medium carbon steel | 830 | 120 | 660 | 96 |
| through 1-1/2" (M36) | 8.8.3 | A325 Type 3 / A449 Type 3 | Heat treated medium carbon weathering steel | 830 | 120 | 660 | 96 |
| All | 10.9 | A490/A354BD | Heat treated medium carbon alloy steel | 1040 | 151 | 940 | 136 |
| through 1-1/2" (M36) | 10.9.3 | A490 Type 3 | Heat treated medium carbon alloy weathering steel | 1040 | 151 | 940 | 136 |
| All | 12.9 | A574 | Heat treated alloy steel | 1220 | 177 | 1100 | 160 |
Mechanical Properties of Grade 8.8 Bolts
Check tensile, yield, and proof values for class 8.8 bolts. These properties guide preload, 8.8 socket size choice, and safety margins.
| Gr. | Size Range | PS [MPa] | YS (minimum) [MPa] | TS (minimum) [MPa] | Hardness [Rockwell] |
|---|---|---|---|---|---|
| Class 8.8 | Under M16 | 580 | 640 | 800 | |
| 17-72 | 600 | 660 | 830 | C23–34 |
Class 8.8 Nuts Chemical Composition
Verify the chemistry for class 8.8 nuts to pair correctly with 8.8 bolts. Consistent composition supports strength and corrosion control.
| CLASS | Material And Treatment | C | C | P | S | B | Tempering Temp. [C] |
|---|---|---|---|---|---|---|---|
| Minimum | Maximum | Maximum | Maximum | Maximum | |||
| 8.8 | Carbon Steel With Additives (E.g. B, Mn Or Cr) Quenched And Tempered | 0.15 (D) | 0.4 | 0.025 | 0.025 | 0.003 | 425 |
| Carbon Steel Quenched And Tempered | 0.25 | 0.55 | 0.035 | 0.025 |
Grade 8.8 Fasteners Weight Chart
Use the 8.8 fasteners weight chart for take-offs and shipping. Accurate weights simplify planning for bulk 8.8 steel orders.
| Lengths Row | #2 | #3 | #4 | #5 | #6 | #8 | #10 | #12 | 1/4″ | 5/16″ | 3/8″ |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/8 | 0.40 | 0.55 | 0.70 | 1.1 | 1.4 | — | — | — | — | — | — |
| 3/16 | 0.50 | 0.70 | 0.90 | 1.2 | 1.5 | 2.5 | 3.9 | — | — | — | — |
| 1/4 | 0.60 | 0.80 | 1.00 | 1.4 | 1.7 | 2.8 | 4.3 | 5.6 | 8.5 | — | — |
| 5/16 | 0.60 | 0.90 | 1.20 | 1.5 | 1.9 | 3.1 | 4.6 | 6.1 | 9.1 | 16.7 | — |
| 3/8 | 0.70 | 0.90 | 1.30 | 1.7 | 2.1 | 3.4 | 5.0 | 6.5 | 9.8 | 17.7 | 29.2 |
| 7/16 | 0.80 | 1.00 | 1.50 | 1.9 | 2.2 | 3.6 | 5.4 | 6.9 | 10.4 | 18.8 | 30.7 |
| 1/2 | 0.80 | 1.10 | 1.60 | 2.0 | 2.4 | 3.9 | 5.8 | 7.4 | 11.1 | 19.8 | 32.2 |
| 9/16 | 0.90 | 1.20 | 1.70 | 2.2 | 2.6 | 4.2 | 6.2 | 7.8 | 11.7 | 20.9 | 33.6 |
| 5/8 | 1.00 | 1.30 | 1.80 | 2.3 | 2.8 | 4.5 | 6.6 | 8.3 | 12.4 | 21.9 | 35.1 |
| 3/4 | 1.10 | 1.50 | 2.10 | 2.6 | 3.2 | 5.0 | 7.3 | 9.2 | 13.6 | 24.0 | 38.0 |
| 7/8 | 1.30 | 1.70 | 2.30 | 3.0 | 3.5 | 5.6 | 8.1 | 10.1 | 14.9 | 26.1 | 41.0 |
| 1″ | 1.40 | 1.90 | 2.50 | 3.4 | 3.9 | 6.2 | 8.9 | 11.0 | 16.1 | 28.8 | 44.0 |
| 1-1/8″ | 1.50 | 2.00 | 2.80 | 3.8 | 4.3 | 6.7 | 9.6 | 11.9 | 17.4 | 30.2 | 47.0 |
| 1-1/4″ | 1.60 | 2.20 | 3.00 | 4.1 | 4.6 | 7.3 | 10.4 | 12.8 | 18.7 | 32.3 | 49.8 |
| 1-1/2″ | 1.80 | 2.50 | 3.50 | 4.7 | 5.3 | 8.3 | 11.9 | 14.7 | 21.2 | 36.5 | 55.8 |
| 1-3/4″ | 2.10 | 2.90 | 4.00 | 5.3 | 6.1 | 9.4 | 13.5 | 16.5 | 23.7 | 40.7 | 61.7 |
| 2″ | 2.40 | 3.30 | 4.50 | 6.0 | 6.8 | 10.6 | 15.0 | 18.3 | 26.2 | 44.8 | 67.6 |
| 2-1/4″ | 2.60 | 3.60 | 5.00 | 6.7 | 7.6 | 11.8 | 16.6 | 20.1 | 28.8 | 19.0 | 73.5 |
| 2-1/2″ | 2.80 | 3.90 | 5.50 | 7.3 | 8.3 | 12.9 | 18.1 | 22.0 | 31.3 | 53.2 | 79.5 |
| 2-3/4″ | 3.10 | 4.30 | 6.00 | 7.9 | 9.1 | 13.9 | 19.7 | 23.8 | 33.9 | 57.3 | 85.3 |
| 3″ | 3.40 | 4.70 | 6.50 | 8.6 | 9.8 | 15.0 | 21.2 | 25.6 | 36.4 | 61.5 | 91.3 |
High Tensile Stainless Steel Class 8.8 Bolt Size Chart
Consult the class 8.8 bolt size chart in mm for quick selection. Find OD, pitch, and length to match your 8.8 hex bolt or stud.
| Class and Material | Nominal Size Range (mm) | Mechanical Properties | ||
|---|---|---|---|---|
| Proof Load (MPa) | Min. Yield Strength (MPa) | Min. Tensile Strength (MPa) | ||
| Class 8.8 Medium carbon steel, quenched and tempered | All sizes below 16mm | 580 | 640 | 800 |
| 16mm - 72mm | 600 | 660 | 830 | |
ASME SA324 8.8 Countersunk Bolt Dimension
Confirm ASME SA324 8.8 countersunk bolt dimensions for flush fits. Proper head and shank sizes ensure clean seating and clamp load.
| Bolt Dia | Body Dia | Head Dia(F) | Head Height (H) | Degree of Slope (D) |
||||
|---|---|---|---|---|---|---|---|---|
| Max | Max | Max Edge Sharp | Min Edge Sharp | Absolute Min Rounded | Max | Min | ||
| 1/2 | 0.515 | 0.935 | 0.905 | 0.845 | 0.269 | 0.233 | 78° to 82° | |
| 5/8 | 0.642 | 1.169 | 1.132 | 1.066 | 0.336 | 0.292 | 78° to 82° | |
| 3/4 | 0.768 | 1.402 | 1.357 | 1.285 | 0.403 | 0.349 | 78° to 82° | |
| 7/8 | 0.895 | 1.637 | 1.584 | 1.511 | 0.47 | 0.408 | 78° to 82° | |
| 1 | 1.022 | 1.869 | 1.81 | 1.735 | 0.537 | 0.466 | 78° to 82° | |
| 1-1/8 | 1.149 | 2.104 | 2.037 | 1.962 | 0.604 | 0.525 | 78° to 82° | |
| 1-1/4 | 1.277 | 2.337 | 2.262 | 2.187 | 0.671 | 0.582 | 78° to 82° | |
| 1-3/8 | 1.404 | 2.571 | 2.489 | 2.414 | 0.738 | 0.641 | 78° to 82° | |
| 1-1/2 | 1.531 | 2.804 | 2.715 | 2.64 | 0.805 | 0.698 | 78° to 82° | |
Dimensions per ASME B18.5 1990 (R 1998)
| Diameter Chart | M4 | M5 | M6 | M8 | M10 | M12 | M14 | M16 | M18 | M20 | M22 | M24 | M27 | M30 | M33 | M36 | M39 | M42 | M45 | M48 | M52 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pitch List | 0.7 | 0.8 | 1 | 1.25 | 1.5 | 1.75 |
2 |
2.5 |
3 |
3.5 |
4 |
4.5 |
5 |
||||||||
| GR A Length | 40 | 50 | 60 | 80 | 100 | 120 | 140 |
150 |
Grade A not applicable to these dia’s | ||||||||||||
|
Head Across Flat (S) Nom = Max Min GR A GR B | 7 | 8 | 10 | 13 | 16 | 18 | 21 | 24 | 27 | 30 | 34 | 36 | 41 | 46 | 50 | 55 | 60 | 65 | 70 | 75 | 80 |
| 6.78 | 7.78 | 9.78 | 12.73 | 15.73 | 17.73 | 20.67 | 23.67 | 26.67 | 29.67 | 33.38 | 35.38 |
GR A not applicable to these diameters | |||||||||
| 6.64 | 7.64 | 9.64 | 12.57 | 15.57 | 17.57 | 20.16 | 23.16 | 26.16 | 29.16 | 33 | 35 | 40 | 45 | 49 | 53.8 | 58.8 | 63.1 | 68.1 | 73.1 | 78.1 | |
|
Head Height Nom Tol + or – GR A GR B | 2.8 | 3.5 | 4 | 5.3 | 6.4 | 7.5 | 8.8 | 10 | 11.5 | 12.5 | 14 | 15 | 17 | 18.7 | 21 | 22.5 | 25 | 26 | 28 | 30 | 33 |
| 0.125 |
0.15 |
0.18 |
0.215 |
GR A not applicable to these diameters | |||||||||||||||||
| 0.2 |
0.24 |
0.29 |
0.35 |
0.42 |
0.5 | ||||||||||||||||
|
Across corners e Min GR A GR B | 7.66 | 8.79 | 11.05 | 14.38 | 17.77 | 20.03 | 23.36 | 26.75 | 30.14 | 33.53 | 37.72 | 39.98 |
GR A not applicable to these diameters | ||||||||
| 7.5 | 8.63 | 10.89 | 14.2 | 17.59 | 19.85 | 22.78 | 26.17 | 29.56 | 32.95 | 37.29 | 39.55 | 45.2 | 50.85 | 55.37 | 60.79 | 66.44 | 71.3 | 76.95 | 82.6 | 88.25 | |
|
Thread Length (b) For lengths < or = 125ilimeter For lengths > 12ilimeter <= 200milimeter For lengths > 200ilimeter | 14 | 16 | 18 | 22 | 26 | 30 | 34 | 38 | 42 | 46 | 50 | 54 | 60 | 66 |
Not specified as full thread recommended | ||||||
| 20 | 22 | 24 | 28 | 32 | 36 | 40 | 44 | 48 | 52 | 56 | 60 | 66 | 72 | 78 | 84 | 90 | 96 | 102 | 108 | 116 | |
| 33 | 35 | 37 | 41 | 45 | 49 | 53 | 57 | 61 | 65 | 69 | 73 | 79 | 85 | 91 | 97 | 103 | 109 | 115 | 121 | 129 | |
| Major Diameter at thread (minimum) | 3.838 | 4.826 | 5.794 | 7.76 | 9.732 | 11.701 | 13.682 | 15.682 | 17.623 | 19.623 | 21.623 | 23.577 | 26.577 | 29.522 | 32.522 | 35.465 | 38.465 | 41.437 | 44.437 | 47.399 | 51.399 |
| Major Dia at thread (maximum) | 3.978 | 4.976 | 5.974 | 7.972 | 9.968 | 11.966 | 13.962 | 15.962 | 17.958 | ||||||||||||
Torque Values For Grade 8.8 Bolts
Apply the recommended Grade 8.8 bolt torque by size, incl. M16 and M20 8.8 bolt torque. Correct torque sets reliable preload.
Maximum Recommended Tightening Torques
| Metric Course Pitch | Grade 12.9 Plated | Metric Course Pitch | Grade 10.9 Plated | Metric Course Pitch | Grade 8.8 Plated | |||
|---|---|---|---|---|---|---|---|---|
| Size | Nm | ft-lb | Size | Nm | ft-lb | Size | Nm | ft-lb |
| M6 | 14 | 10 | M6 | 12 | 9 | M6 | 8 | 6 |
| M8 | 34 | 25 | M8 | 29 | 21 | M8 | 20 | 15 |
| M10 | 68 | 50 | M10 | 57 | 42 | M10 | 40 | 30 |
| M12 | 119 | 88 | M12 | 99 | 73 | M12 | 70 | 52 |
| (M14) | 189 | 139 | (M14) | 158 | 116 | (M14) | 112 | 83 |
| M16 | 295 | 218 | M16 | 246 | 181 | M16 | 175 | 129 |
| (M18) | 406 | 299 | (M18) | 338 | 249 | (M18) | 241 | 177 |
| M20 | 576 | 424 | M20 | 480 | 354 | M20 | 341 | 252 |
| (M22) | 783 | 577 | (M22) | 652 | 481 | (M22) | 464 | 342 |
| M24 | 995 | 734 | M24 | 829 | 612 | M24 | 590 | 435 |
| (M27) | 1456 | 1074 | (M27) | 1213 | 895 | (M27) | 863 | 636 |
| M30 | 1977 | 1458 | M30 | 1647 | 1215 | M30 | 1171 | 864 |
| (M33) | 2690 | 1984 | (M33) | 2242 | 1653 | (M33) | 1594 | 1176 |
| M36 | 3454 | 2548 | M36 | 2879 | 2123 | M36 | 2047 | 1510 |
| (M39) | 4471 | 3298 | (M39) | 3726 | 2748 | (M39) | 2649 | 1954 |
| M42 | 5525 | 4075 | M42 | 4604 | 3396 | M42 | 3274 | 2415 |
| (M45) | 6871 | 5068 | (M45) | 5726 | 4223 | (M45) | 4072 | 3003 |
| M48 | 8287 | 6113 | M48 | 6906 | 5094 | M48 | 4911 | 3622 |
| M52 | 10749 | 7928 | M52 | 8958 | 6607 | M52 | 6370 | 4698 |
ASME BS 3692 Grade 8.8 Bolt Hardness
Check BS 3692 Grade 8.8 hardness to verify heat-treat quality. Proper hardness supports fatigue life and stable clamp force.
| Grade Of Fasteners | Description Of Fasteners | Diameter Of Fasteners | Tensile Strength, minimum | Yield Strength, minimum | Hardness, maximum | Marking |
|---|---|---|---|---|---|---|
| ASTM A193 B6 | S41000 (410) | Up to 4” | 110 | 85 | B6 | |
| ASTM A193 B7 | Chromium-Molybdenum | 2 1/2” and under | 125 | 105 | 321 HB or 35 HRC | B7 |
| over 2 1/2” to 4” | 115 | 95 | 321 HB or 35 HRC | |||
| over 4” to 7” | 100 | 75 | 321 HB or 35 HRC | |||
| ASTM A193 B7M | Chromium-Molybdenum | 4” and under | 100 | 80 | 235 HB or 99 HRB | B7M |
| over 4” to 7” | 100 | 75 | 235 HB or 99 HRB | |||
| ASTM A193 B16 | Chromium-Molybdenum- Vanadium | 2 1/2” and under | 125 | 105 | 321 HB or 35 HRC | B16 |
| over 2 1/2” to 4” | 110 | 95 | 321 HB or 35 HRC | |||
| over 4” to 8” | 100 | 85 | 321 HB or 35 HRC | |||
| ASTM A193 B8 class 1 | S30400 (304) | all | 75 | 30 | 223 HB or 96 HRB | B8 |
| ASTM A193 B8 class 2 | S30400 (304) | 3/4” and under | 125 | 100 | 321 HB or 35 HRC | B8SH |
| over 3/4” to 1” | 115 | 80 | 321 HB or 35 HRC | |||
| over 1” to 1 1/4” | 105 | 65 | 321 HB or 35 HRC | |||
| over 1 1/4” to 1 1/2” | 100 | 50 | 321 HB or 35 HRC | |||
| ASTM A193 B8C class 1 | S34700 (347) | all | 75 | 30 | 223 HB or 96 HRB | B8C |
| ASTM A193 B8C class 2 | S34700 (347) | 3/4” and under | 125 | 100 | 321 HB or 35 HRC | B8CSH |
| over 3/4” to 1” | 115 | 80 | 321 HB or 35 HRC | |||
| over 1” to 1 1/4” | 105 | 65 | 321 HB or 35 HRC | |||
| over 1 1/4” to 1 1/2” | 100 | 50 | 321 HB or 35 HRC | |||
| ASTM A193 B8M class 1 | S31600 (316) | all | 75 | 30 | 223 HB or 96 HRB | B8M |
| ASTM A193 B8M class 2 | S31600 (316) | 3/4” and under | 110 | 95 | 321 HB or 35 HRC | B8MSH |
| over 3/4” to 1” | 100 | 80 | 321 HB or 35 HRC | |||
| over 1” to 1 1/4” | 95 | 65 | 321 HB or 35 HRC | |||
| over 1 1/4” to 1 1/2” | 90 | 50 | 321 HB or 35 HRC | |||
| ASTM A193 B8T class 1 | S32100 (321) | all | 75 | 30 | 223 HB or 96 HRB | B8T |
| ASTM A193 B8T class 2 | S32100 (321) | 3/4” and under | 125 | 100 | 321 HB or 35 HRC | B8TSH |
| over 3/4” to 1” | 115 | 80 | 321 HB or 35 HRC | |||
| over 1” to 1 1/4” | 105 | 65 | 321 HB or 35 HRC | |||
| over 1 1/4” to 1 1/2” | 100 | 50 | 321 HB or 35 HRC | |||
| ASTM A193 B8R | S20910 | all | 100 | 55 | 271 HB or 28 HRC | B8R |
| ASTM A193 B8S | S21800 | all | 95 | 50 | 271 HB or 28 HRC | B8S |
Grade 8.8 Bolts, Screws, Threaded Rod & Washers Price List
| Grade 8.8 Fasteners Price List | Price Per Pcs. |
|---|---|
| Grade 8.8 Machine bolts price | USD $5.10 |
| Grade 8.8 Hex head bolts price | USD $6.05 |
| High Tensile Grade 8.8 Socket Head Cap Screw price | USD $3.10 |
| Grade 8.8 Screws price | USD $3.70 |
| Grade 8.8 Dowel Pins price | USD $1.20 |
| Grade 8.8 Allen bolts price | USD $4.25 |
| Grade 8.8 Washer price | USD $1.00 |
| Grade 8.8 Nuts price | USD $1.45 |
Frequently Asked Questions About Grade 8.8 Bolts
What does an 8.8 grade bolt mean?
Grade 8.8 bolt means a medium carbon steel bolt with tensile strength of 800 MPa and yield strength 80% of tensile (640 MPa). Heat treated by quenching and tempering, it’s used for medium to heavy structural applications.
Is grade 8.8 or 12.9 stronger?
Grade 12.9 is stronger than 8.8. Grade 12.9 bolts have tensile strength around 1200 MPa, ideal for heavy-duty use, while 8.8 bolts have about 800 MPa, suited for medium strength needs.
What is a grade 8.8 bolt nut?
Grade 8.8 nuts are high-tensile nuts made to fit grade 8.8 bolts. Made of medium carbon steel, they provide strong, secure fastening with precise threading and often hex shape for industrial applications.
Do grade 8.8 bolts rust?
Grade 8.8 bolts are carbon steel and can rust if not coated. Commonly zinc plated or galvanized to resist corrosion, unprotected bolts may rust in moist or harsh environments.
How do I identify an 8.8 bolt?
An 8.8 bolt is identified by the “8.8” marking stamped on the bolt head. It’s usually medium carbon steel, heat treated, with standardized metric sizes and may have coatings like zinc plating.