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High-Strength Special Metal Bolts

Precision-engineered bolts offering exceptional mechanical strength and corrosion resistance for critical joints.

Bolt Types and Machining Capabilities

ATX supports a wide range of high-strength special metal bolts for structural and industrial applications.

Available bolt types include hex bolts, heavy hex bolts, wrench bolts, stud bolts, and countersunk head bolts, with options tailored through machining and specification support as required.

Bolts are selected and processed based on load conditions, dimensional requirements, and service environments, ensuring reliable fastening performance, accuracy, and corrosion resistance.

Custom machining and specification support are available to accommodate application-specific design and operating conditions.

ATX Bolts

Available Materials

Hex Bolt

A standard hexagonal-head bolt used for fastening components in structural and industrial applications, offering reliable clamping and easy installation.

ATX Hex Bolt
Nominal Thread Size (M) Thread Pitch (P) Head Height H Width Across Flats B Width Across Corners C
Thread Pitch P (Normal) Thread Pitch P (Fine)
M6 1 – 4 10 11.5
M8 1.25 1 5.5 13 15
M10 1.5 1.25 7 17 19.6
M12 1.75 1.25 8 19 21.9
M14 2 1.5 9 22 25.4
M16 2 1.5 10 24 27.7
M18 2.5 1.5 12 27 31.2
M20 2.5 1.5 / 2.0 13 30 34.6
M22 2.5 1.5 / 2.0 14 32 37
M24 3 1.5 / 2.0 15 36 41.6
M27 3 1.5 / 2.0 17 41 47.3
M30 3.5 1.5 / 2.0 / 3.0 19 46 53.1
M33 3.5 1.5 / 2.0 / 3.0 21 50 57.7
M36 4 1.5 / 2.0 / 3.0 23 55 63.5
M39 4 2.0 / 3.0 25 60 69.3
M42 4.5 2.0 / 3.0 26 65 75
M45 4.5 2.0 / 3.0 28 70 80.8
M48 5 2.0 / 3.0 30 75 86.5
Nominal Size Thread Type Pitch (TPI) Width Across Flats (AF)
1/4" UNC / UNF 20 / 28 7/16"
5/16" UNC / UNF 18 / 24 1/2"
3/8" UNC / UNF 16 / 24 9/16"
7/16" UNC / UNF 14 / 20 5/8"
1/2" UNC / UNF 13 / 20 3/4"
5/8" UNC / UNF 11 / 18 15/16"
3/4" UNC / UNF 10 / 16 1-1/8"
7/8" UNC / UNF 9 / 14 1-5/16"
1" UNC / UNF 8 / 12 1-1/2"
1-1/8" UNC / UNF 7 / 12 1-11/16"
1-1/4" UNC / UNF 7 / 12 1-7/8"
1-3/8" UNC / UNF 6 / 12 2-1/16"
1-1/2" UNC / UNF 6 / 12 2-1/4"
1-5/8" UNC / UNF 5 / 11 2-7/16"
1-3/4" UNC / UNF 5 / 12 2-5/8"
Classification International Standards
ISO ISO 4014 (Partial thread) / ISO 4017 (Full thread)
DIN DIN 931 (Partial) / DIN 933 (Full)
JIS JIS B 1180
KS KS B 1002
ANSI / ASME ASME B18.2.1
BS BS 3692 / BS 1768

Heavy Hex Bolt

A heavy hexagonal-head bolt designed for high-strength fastening in structural and industrial applications, providing enhanced load-bearing capacity and secure clamping.

ATX Heavy Hex Bolt
Bolt blueprint
Nominal Diameter (M) Thread Pitch (P) Width Across Flats (B) Head Height (H)
M12 1.75 22 10
M16 2 30 14
M20 2.5 34 17
M22 2.5 36 19
M24 3 41 21
M27 3 46 23
M30 3.5 50 25
M33 3.5 55 28
M36 4 60 30
Nominal Size Thread Pitch (TPI) Width Across Flats (AF) Head Height
1/2" UNC / UNF 13 / 20 7/8" 5/16"
5/8" UNC / UNF 11 / 18 1" 3/8"
3/4" UNC / UNF 10 / 16 1-1/8" 7/16"
7/8" UNC / UNF 9 / 14 1-5/16" 1/2"
1" UNC / UNF 8 / 12 1-1/2" 9/16"
1-1/8" UNC / UNF 7 / 12 1-11/16" 5/8"
1-1/4" UNC / UNF 7 / 12 1-7/8" 11/16"
1-3/8" UNC / UNF 6 / 12 2-1/16" 3/4"
1-1/2" UNC / UNF 6 / 12 2-1/4" 13/16"
Classification International Standards
ISO ISO 4014 / ISO 4017 (Heavy Hex 형상 적용)
DIN DIN 6914 (Structural Heavy Hex)
ASTM ASTM A325 / ASTM A490
ANSI / ASME ASME B18.2.1 (Heavy Hex Type)
BS BS EN 14399

Wrench Bolt

A wrench-driven bolt with an internal hex socket, commonly used in industrial and mechanical assemblies where compact installation and secure fastening are required.

ATX Wrench Bolt
Bolt blueprint
Nominal Diameter (M) Thread Pitch (P) Width Across Flats (B) Head Height (H) Width Across Corners (C)
M2 0.4 3.8 2 4.7
M2.5 0.45 4.5 2.5 5.9
M3 0.5 5.5 3 7
M4 0.7 7 4 8.9
M5 0.8 8.5 5 10.8
M6 1 10 6 12.6
M8 1.25 13 8 15.8
M10 1.5 16 10 19.6
M12 1.75 18 12 22.1
M14 2 21 14 25.4
M16 2 24 16 27.7
M18 2.5 27 18 31.2
M20 2.5 30 20 34.6
M22 2.5 33 22 37.9
M24 3 36 24 41.6
M27 3 41 27 47.3
M30 3.5 46 30 53.1
M33 3.5 50 33 57.7
Nominal Size Thread Pitch (TPI) Width Across Flats (AF) Head Height
1/4" UNC / UNF 20 / 28 7/16" 5/32"
5/16" UNC / UNF 18 / 24 1/2" 3/16"
3/8" UNC / UNF 16 / 24 9/16" 7/32"
7/16" UNC / UNF 14 / 20 5/8" 1/4"
1/2" UNC / UNF 13 / 20 3/4" 5/16"
5/8" UNC / UNF 11 / 18 15/16" 25/64"
3/4" UNC / UNF 10 / 16 1-1/8" 3/8"
7/8" UNC / UNF 9 / 14 1-5/16" 29/64"
1" UNC / UNF 8 / 12 1-1/2" 5/8"
1-1/8" UNC / UNF 7 / 12 1-11/16" 23/32"
1-1/4" UNC / UNF 7 / 12 1-7/8" 3/4"
1-3/8" UNC / UNF 6 / 12 2-1/16" 13/16"
1-1/2" UNC / UNF 6 / 12 2-1/4" 7/8"
Classification International Standards
ISO ISO 4014 (Partial thread) / ISO 4017 (Full thread)
DIN DIN 931 (Partial) / DIN 933 (Full)
JIS JIS B 1180
KS KS B 1002
ANSI / ASME ASME B18.2.1
BS BS 3692 / BS 1768

Stud Bolt

A fully threaded bolt used with nuts on both ends for high-strength fastening in pressure vessels, flanges, and industrial assemblies.

ATX Stud Bolt
Instructions for measuring bolt size
Classification International Standards
ISO ISO 898-1 (Mechanical properties reference)
DIN DIN 975 / DIN 976
JIS JIS B 1173
ASTM ASTM A193 / A320
ASME ASME B18.31.2
BS BS 4882
Nominal Diameter (M) Thread Pitch (P) Major Diameter (d)
M12 1.75 12
M16 2 16
M20 2.5 20
M22 2.5 22
M24 3 24
Bolt Specification 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125
M12 ● ● ● ● ● ● ● ● ● ● ● – – – – –
M16 – – ● ● ● ● ● ● ● ● ● ● ● ● ● ●
M20 – – – – – – ● ● ● ● ● ● ● ● ● ●
M22 – – – – – – – – – – ● ● ● ● ● ●
M24 – – – – – – – – – – ● ● ● ● ● ●
Bolt Specification 130 135 140 145 150 160 170 180 190 200 210 220 230 240 250
M12 – – – – – – – – – – – – – – –
M16 ● ● ● ● ● ● – – – – – – – – –
M20 ● ● ● ● ● ● ● ● ● ● – – – – –
M22 ● ● ● ● ● ● ● ● ● ● ● ● ● ● –
M24 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
Nominal Size Thread Type Pitch (TPI)
1/2" UNC / UNF 13 / 20
5/8" UNC / UNF 11 / 18
3/4" UNC / UNF 10 / 16
7/8" UNC / UNF 9 / 14
1" UNC / UNF 8 / 12
Size 2" 2-1/2" 3" 3-1/2" 4" 4-1/2" 5" 6" 7" 8" 9" 10"
1/2" ● ● ● ● ● ● ● – – – – –
5/8" – ● ● ● ● ● ● ● ● – – –
3/4" – – ● ● ● ● ● ● ● ● – –
7/8" – – – ● ● ● ● ● ● ● ● –
1" – – – – ● ● ● ● ● ● ● ●

Mud Wrench Bolt

A compact, fully threaded bolt with an internal hex drive, used for secure fastening and positioning of components without an external head.

ATX Mud Wrench Bolt
Bolt blueprint
Nominal Diameter (M) Thread Pitch (P) Head Diameter (D) Head Height (H) Socket Width Across Flats (S)
M2 0.4 3.8 2 0.9
M2.5 0.45 4.5 2.5 1.3
M3 0.5 5.5 3 1.5
M4 0.7 7 4 2
M5 0.8 8.5 5 2.5
M6 1 10 6 3
M8 1.25 13 8 4
M10 1.5 16 10 5
M12 1.75 18 12 6
M14 2 21 14 6
M16 2 24 16 8
M18 2.5 27 18 8
M20 2.5 30 20 10
Nominal Size Thread Pitch (TPI) Head Diameter (D) Head Height (H) Hex Socket (S)
1/4" UNC / UNF 20 / 28 0.375 0.156 3/16"
5/16" UNC / UNF 18 / 24 0.469 0.188 1/4"
3/8" UNC / UNF 16 / 24 0.562 0.219 5/16"
7/16" UNC / UNF 14 / 20 0.656 0.25 3/8"
1/2" UNC / UNF 13 / 20 0.75 0.312 3/8"
5/8" UNC / UNF 11 / 18 0.938 0.391 1/2"
3/4" UNC / UNF 10 / 16 1.125 0.469 5/8"
7/8" UNC / UNF 9 / 14 1.312 0.547 3/4"
1" UNC / UNF 8 / 12 1.5 0.625 3/4"
Classification International Standards
ISO ISO 4762 (Standard Reference for Socket Head Cap Screws)
DIN DIN 912 (Based on Socket Head Cap Screw Specifications)
JIS JIS B 1176
ANSI / ASME ASME B18.3

Countersunk Head Bolt

A countersunk-head bolt designed to sit flush with the surface, commonly used where a smooth finish and secure fastening are required.

ATX Countersunk Head Bolt
bolts on display
Nominal Diameter (M) Thread Pitch (P) Head Diameter (dk) Head Height (k) Socket Width Across Flats (s)
M3 0.5 6 1.7 2
M4 0.7 8 2.3 2.5
M5 0.8 10 2.8 3
M6 1 12 3.3 4
M8 1.25 16 4 5
M10 1.5 20 6 6
M12 1.75 24 7.4 8
M14 2 28 8.4 10
M16 2 30 8.8 10
M20 2.5 40 10 12
Nominal Size Thread Pitch (TPI) Head Diameter (dk) Head Height (k) Hex Socket (s)
1/4" UNC / UNF 20 / 28 0.5 0.125 1/8"
5/16" UNC / UNF 18 / 24 0.625 0.156 5/32"
3/8" UNC / UNF 16 / 24 0.75 0.188 3/16"
7/16" UNC / UNF 14 / 20 0.875 0.219 7/32"
1/2" UNC / UNF 13 / 20 1 0.25 1/4"
5/8" UNC / UNF 11 / 18 1.25 0.312 5/16"
3/4" UNC / UNF 10 / 16 1.5 0.375 3/8"
Classification International Standards
ISO ISO 10642
DIN DIN 7991
JIS JIS B 1194
ANSI / ASME ASME B18.3 (Countersunk)
BS BS 4168

Custom Machined Bolt

A precision-machined bolt manufactured to custom specifications, designed to meet specific dimensional, strength, and application requirements.

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For geometries, dimensions, materials, or application conditions that cannot be addressed by standard specifications, custom machined bolts can be manufactured based on customer requirements and project specifications.

Material Grades & Applicable Standards

Ti
Titanium

Ta
Tantalum

Zr
Zirconium

Nb
Niobium

Ni
Nickel

Detailed material properties, corrosion resistance data,
and applicable standards for each material are provided below.

View Material Standards & Grades

Engineering Inquiry

For detailed availability, lead time, and quotation,
please contact us with your required specifications.

Request Quotation