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Home / Fastening / Bolts / Bolts with an inch thread

Bolts with an inch thread

https://dinmark.com.ua/images/DIN 931 Bolt with hexagonal head and partial thread, inch thread - Інтернет-магазин DinmarkDIN 931 Bolt with hexagonal head and partial thread, inch threadhttps://dinmark.com.ua/images/DIN 933 Hex head bolt with full thread, inch thread - Інтернет-магазин DinmarkDIN 933 Hex head bolt with full thread, inch threadhttps://dinmark.com.ua/images/DIN 912 Bolt with a cylindrical head and an internal hexagon with an inch thread - Інтернет-магазин DinmarkDIN 912 Bolt with a cylindrical head and an internal hexagon with an inch thread
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DIN 931 8.8 zinc UNC Hex head bolt with partial thread, inch thread
Stal png8.8 pngZinc png
DIN 931 8.8 zinc UNC Hex head bolt with partial thread, inch thread
DIN 931 8.8 zinc UNC Hex head bolt with partial thread, inch thread Fastening groupHigh-strength fastening..StandardDIN 931MaterialStalStrength class8.8CoatingZincDiameter in inches1, 1/2, 1/4, 3/4..Length in inches1, 1 1/2, 1 1/4..Packaging, pcs.100, 25, 50HeadHexagonalType of carvingPartiallyThread typeInchAnalogASME B 18.2.1
DIN 931 8.8 UNC Hex Head Bolt with Partial Thread, Inch Thread
Stal png8.8 pngUncovered png
DIN 931 8.8 UNC Hex Head Bolt with Partial Thread, Inch Thread
DIN 931 8.8 UNC Hex Head Bolt with Partial Thread, Inch Thread Fastening groupHigh-strength fastening..StandardDIN 931MaterialStalStrength class8.8CoatingUncoveredDiameter in inches1 1/2, 1, 1 1/4..Length in inches1, 1 1/2, 1 1/4..Packaging, pcs.200, 100, 25, 1..HeadHexagonalType of carvingPartiallyThread typeInchAnalogASME B 18.2.1
DIN 931 10.9 UNC Hex Head Bolt with Partial Thread, Inch Thread
Stal png10.9 pngUncovered png
DIN 931 10.9 UNC Hex Head Bolt with Partial Thread, Inch Thread
DIN 931 10.9 UNC Hex Head Bolt with Partial Thread, Inch Thread Fastening groupOne-inch mountStandardDIN 931MaterialStalStrength class10.9CoatingUncoveredDiameter in inches1 1/2, 1, 1 1/4..Length in inches1 1/2, 1 1/4, 2..Packaging, pcs.200, 100, 25, 1..HeadHexagonalType of carvingPartiallyThread typeInchAnalogASME B 18.2.1
DIN 931 10.9 UNF Hex Head Bolt with Partial Thread, Inch Thread
Stal png10.9 pngUncovered png
DIN 931 10.9 UNF Hex Head Bolt with Partial Thread, Inch Thread
DIN 931 10.9 UNF Hex Head Bolt with Partial Thread, Inch Thread Fastening groupHigh-strength fastening..StandardDIN 931MaterialStalStrength class10.9CoatingUncoveredDiameter in inches1, 1 1/4, 1/2, 1/4..Length in inches1 1/2, 1 1/4, 2..Packaging, pcs.200, 100, 25, 10..HeadHexagonalType of carvingPartiallyThread typeInchAnalogASME B 18.2.1
DIN 931 8.8 UNF Hex Head Bolt with Partial Thread, Inch Thread
Stal png8.8 pngUncovered png
DIN 931 8.8 UNF Hex Head Bolt with Partial Thread, Inch Thread
DIN 931 8.8 UNF Hex Head Bolt with Partial Thread, Inch Thread Fastening groupHigh-strength fastening..StandardDIN 931MaterialStalStrength class8.8CoatingUncoveredDiameter in inches1 1/2, 1, 1 1/4..Length in inches1 1/2, 1 1/4, 2..Packaging, pcs.200, 100, 25, 1..HeadHexagonalType of carvingPartiallyThread typeInchAnalogASME B 18.2.1
DIN 933 8.8 zinc UNC Hex head bolt with full thread, inch thread
Stal png8.8 pngZinc png
DIN 933 8.8 zinc UNC Hex head bolt with full thread, inch thread
DIN 933 8.8 zinc UNC Hex head bolt with full thread, inch thread Fastening groupHigh-strength fastening..StandardDIN 933MaterialStalStrength class8.8CoatingZincDiameter in inches1/2, 1/4, 3/4, 3/8..Length in inches1, 1 1/2, 1 1/4..Packaging, pcs.100, 25, 50HeadHexagonalType of carvingFullThread typeInchAnalogASME B 18.2.1
DIN 933 8.8 UNC Hex head bolt with full thread, inch thread
Stal png8.8 pngUncovered png
DIN 933 8.8 UNC Hex head bolt with full thread, inch thread
DIN 933 8.8 UNC Hex head bolt with full thread, inch thread Fastening groupHigh-strength fastening..StandardDIN 933MaterialStalStrength class8.8CoatingUncoveredDiameter in inches1 1/2, 1, 1/2, 1/4..Length in inches1, 1 1/2, 1 1/4..Packaging, pcs.100, 25, 1, 10..HeadHexagonalType of carvingFullThread typeInchAnalogASME B 18.2.1
DIN 933 10.9 UNC Hex head bolt with full thread, inch thread
Stal png10.9 pngUncovered png
DIN 933 10.9 UNC Hex head bolt with full thread, inch thread
DIN 933 10.9 UNC Hex head bolt with full thread, inch thread Fastening groupHigh-strength fastening..StandardDIN 933MaterialStalStrength class10.9CoatingUncoveredDiameter in inches1 1/2, 1, 1/2, 1/4..Length in inches1, 1 1/2, 1 1/4..Packaging, pcs.100, 25, 1, 50HeadHexagonalType of carvingFullThread typeInchAnalogASME B 18.2.1
DIN 933 10.9 UNF Hex Head Bolt with Full Thread, Inch Thread
Stal png10.9 pngUncovered png
DIN 933 10.9 UNF Hex Head Bolt with Full Thread, Inch Thread
DIN 933 10.9 UNF Hex Head Bolt with Full Thread, Inch Thread Fastening groupOne-inch mountStandardDIN 933MaterialStalStrength class10.9CoatingUncoveredDiameter in inches1/2, 1/4, 3/4, 3/8..Length in inches1, 1 1/2, 1 1/4..Packaging, pcs.100, 25, 50HeadHexagonalType of carvingFullThread typeInchAnalogASME B 18.2.1
DIN 933 8.8 UNF Hex Head Bolt with Full Thread, Inch Thread
Stal png8.8 pngUncovered png
DIN 933 8.8 UNF Hex Head Bolt with Full Thread, Inch Thread
DIN 933 8.8 UNF Hex Head Bolt with Full Thread, Inch Thread Fastening groupOne-inch mountStandardDIN 933MaterialStalStrength class8.8CoatingUncoveredDiameter in inches1/2, 1/4, 3/4, 3/8..Length in inches1, 1 1/2, 1 1/4..Packaging, pcs.100, 25, 50HeadHexagonalType of carvingFullThread typeInchAnalogASME B 18.2.1
DIN 912 12.9 UNC Cylindrical socket head cap bolt with inch thread
Stal png12.9 pngUncovered png
DIN 912 12.9 UNC Cylindrical socket head cap bolt with inch thread
DIN 912 12.9 UNC Cylindrical socket head cap bolt with inch thread Fastening groupHigh-strength fastening..StandardDIN 912MaterialStalStrength class12.9CoatingUncoveredDiameter in inches#10, #8, #5, #4..Length in inches1, 1 1/2, 1 1/4..Packaging, pcs.200, 100, 25, 10..HeadCylindricalType of carvingPartiallySlotHexagonal..Thread typeInchAnalogASME B 18.3

Purpose of inch thread bolts

Inch thread bolts are designed to connect parts in mechanical engineering, construction, electrical engineering, and other industries. These bolts are used to create mechanical connections with parts that have inch threads.

Inch thread bolts have a tensile strength coefficient that ensures their strength and durability. They can vary in length and diameter, depending on the specific application.

The applications of inch thread bolts can be very diverse: from connecting parts of mechanisms and equipment to assembling structures and metal structures. They can also be used to secure various types of fasteners and various parts that must be securely fastened, for example, when assembling metal structures or installing electrical devices.

Thread pitch: UNC, UNF

UNC and UNF are inch thread standards used in mechanical engineering, the automotive industry, and other sectors.

UNC stands for Unified National Coarse Thread and has a larger thread pitch, which provides greater joint strength. The UNC thread pitch is determined by the number of threads per inch. For example, 1/4 UNC has 20 threads per inch.

UNF stands for Unified National Fine Thread and has a smaller thread pitch, which provides better sealing for the connection. The UNF thread pitch is also determined by the number of threads per inch. For example, 1/4 UNF has 28 threads per inch.

Applications for inch bolts

Inch bolts have a wide range of applications in various industries, such as:

  • Mechanical engineering: bolts with inch threads are used for the assembly and repair of cars, motorcycles, airplanes, and other vehicles.
  • Construction: Inch thread bolts are used for assembling and fastening metal structures such as bridges, buildings, towers, and other structures.
  • Electrical engineering: Inch thread bolts are used to fasten electrical panels, devices, and equipment.
  • Agriculture: Inch thread bolts are used to assemble and maintain agricultural machinery and equipment.
  • Food industry: Inch thread bolts are used to assemble and maintain food industry equipment, for example, to secure conveyors and food production lines.
  • Repair and maintenance: Inch thread bolts are used to repair and maintain various mechanisms, devices, and equipment.
  • Sports: Inch thread bolts are used to assemble sports equipment, such as securing turnstiles, parallel bars, and other sports devices.

How to measure threads

There are several ways to measure inch threads, one of which is to measure the outer diameter of a bolt or nut using a ruler or micrometer with the imperial measurement system. Another way is to measure the number of threads per inch using a template. To measure internal threads, you can use a special template with cutting edges.

How to choose UNC and UNF inch bolts in Ukraine

When choosing UNC and UNF inch bolts in Ukraine, it is necessary to consider the size of the bolt or nut and the type of load to which these bolts will be subjected. UNC bolts are typically used for standard tasks, while UNF bolts are used for more demanding applications. It is also important to choose the correct bolt length, ensuring the necessary length allowance for installation.

Diameters and other parameters of UNС inch threads

 

Thread designation

Outer diameter, inches

Outer diameter, mm

Diameter of drill bit for thread, mm

Number of turns per inch

Thread pitch, mm
N 1 - 64 UNC 0,073 1,854 1,5 64 0,397
N 2 - 56 UNC 0,086 2,184 1,8 56 0,453
N 3 - 48 UNC 0,099 2,515 2,1 48 0,529
N 4 - 40 UNC 0,112 2,845 2,35 40 0,635
N 5 - 40 UNC 0,125 3,175 2,65 40 0,635
N 6 - 32 UNC 0,138 3,505 2,85 32 0,794
N 8 - 32 UNC 0,164 4,166 3,5 32 0,794
N 10 - 24 UNC 0,19 4,826 4 24 1,058
N 12 - 24 UNC 0,216 5,486 4,65 24 1,058
1 / 4" - 20 UNC 0,25 6,35 5,35 20 1,27
5 / 16" - 18 UNC 0,313 7,938 6,8 18 1,411
3 / 8" - 16 UNC 0,375 9,525 8,25 16 1,587
7 / 16" - 14 UNC 0,438 11,112 9,65 14 1,814
1 / 2" - 13 UNC 0,5 12,7 11,15 13 1,954
9 / 16" - 12 UNC 0,563 14,288 12,6 12 2,117
5 / 8" - 11 UNC 0,625 15,875 14,05 11 2,309
3 / 4" - 10 UNC 0,75 19,05 17 10 2,54
7 / 8" - 9 UNC 0,875 22,225 20 9 2,822
1" - 8 UNC 1 25,4 22,25 8 3,175
1 1 / 8" - 7 UNC 1,125 28,575 25,65 7 3,628
1 1 / 4" - 7 UNC 1,25 31,75 28,85 7 3,628
1 3 / 8" - 6 UNC 1,375 34,925 31,55 6 4,233
1 1 / 2" - 6 UNC 1,5 38,1 34,7 6 4,233
1 3 / 4" - 5 UNC 1,75 44,45 40,4 5 5,08
2" - 4 1 / 2 UNC 2 50,8 46,3 4,5 5,644
2 1 / 4" - 4 1 / 2 UNC 2,25 57,15 52,65 4,5 5,644
2 1 / 2" - 4 UNC 2,5 63,5 58,5 4 6,35
2 3 / 4" - 4 UNC 2,75 69,85 64,75 4 6,35
3" - 4 UNC 3 76,2 71,1 4 6,35
3 1 / 4" - 4 UNC 3,25 82,55 77,45 4 6,35
3 1 / 2" - 4 UNC 3,5 88,9 83,8 4 6,35
3 3 / 4" - 4 UNC 3,75 95,25 90,15 4 6,35
4" - 4 UNC 4 101,6 96,5 4 6,35

 

Diameters and other parameters of UNF inch threads

Thread designation

Outer diameter, inches

 Outer diameter, mm Diameter of drill bit for thread, mm

Number of turns per inch

 Thread pitch, mm
N 0 - 80 UNF 0,06 1,524 1,25 80 0,317
N 1 - 72 UNF 0,073 1,854 1,55 72 0,353
N 2 - 64 UNF 0,068 2,184 1,9 64 0,397
N 3 - 56 UNF 0,099 2,515 2,15 56 0,453
N 4 - 48 UNF 0,112 2,845 2,4 48 0,529
N 5 - 44 UNF 0,125 3,175 2,7 44 0,577
N 6 - 40 UNF 0,138 3,505 2,95 40 0,635
N 8 - 36 UNF 0,164 4,166 3,5 36 0,705
N 10 - 32 UNF 0,19 4,826 4,1 32 0,794
N 12 - 28 UNF 0,216 5,486 4,7 28 0,907
1 / 4" - 28 UNF 0,25 6,35 5,5 28 0,907
5 / 16" - 24 UNF 0,313 7,938 6,9 24 1,058
3 / 8" - 28 UNF 0,375 9,525 8,5 24 1,058
7 / 16" - 20 UNF 0,438 11,112 9,9 20 1,27
1 / 2" - 20 UNF 0,5 12,7 11,5 20 1,27
9 / 16" - 18 UNF 0,563 14,288 12,9 18 1,411
5 / 8" - 18 UNF 0,625 15,875 14,5 18 1,411
3 / 4" - 16 UNF 0,75 19,05 17,5 16 1,587
7 / 8" - 14 UNF 0,875 22,225 20,4 14 1,814
1" - 12 UNF 1 25,4 23,25 12 2,117
1 1 / 8" - 12 UNF 1,25 28,575 26,5 12 2,117
1 1 / 4" - 12 UNF 1,25 31,75 29,5 12 2,117
1 3/ 8" - 12 UNF 1,375 34,925 32,75 12 2,117
1 1/ 2" - 12 UNF 1,5 38,1 36 12 2,117

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