Hexagon Socket Head Cap Screw

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Hexagon Socket Head Cap Screw
Hexagon Socket Head Cap Screw
Hexagon Socket Head Cap Screw
Hexagon Socket Head Cap Screw
Hexagon Socket Head Cap Screw
Hexagon Socket Head Cap Screw
Screws

Hexagon Socket Head Cap Screw

GB 70.1 - 2008

Wohe Fastener is based in Yongnian, Handan, China. We supply export-ready fasteners with specification review, packing support and stable batch delivery.
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Multiple Sizes Common sizes and standards can be matched for overseas orders.
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Material Options Carbon steel, stainless steel, grade and surface finish options.
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Stable Supply Production, inspection, packing and shipment coordination.
Specifications
Product categoryScrews
Product codeWH-213506
Published2026-09-24 03:30:40
Production originYongnian District, Handan, Hebei, China
Call Sales
Wohe Fastener

Product Specifications

Model / SpecificationM1.6 - M64
MaterialCarbon Steel
Thd. size
d		 M1.6 M2 M2.5 M3 M4 M5 M6 M8 M10 M12
P Pitch 0.35 0.4 0.45 0.5 0.7 0.8 1 1.25 1.5 1.75
dk Max. Smooth head 3 3.8 4.5 5.5 7 8.5 10 13 16 18
Knurled head 3.14 3.98 4.68 5.68 7.22 8.72 10.22 13.27 16.27 18.27
Min. 2.86 3.62 4.32 5.32 6.78 8.28 9.78 12.73 15.73 17.73
da Max. 2 2.6 3.1 3.6 4.7 5.7 6.8 9.2 11.2 13.7
ds Max. 1.6 2 2.5 3 4 5 6 8 10 12
Min. 1.46 1.86 2.36 2.86 3.82 4.82 5.82 7.78 9.78 11.73
e Min. 1.733 1.733 2.303 2.873 3.443 4.583 5.723 6.683 9.149 11.429
k Max. 1.60 2.00 2.50 3.00 4.00 5.00 6.00 8.00 10.00 12.00
Min. 1.46 1.86 2.36 2.86 3.82 4.82 5.7 7.64 9.64 11.57
s Nom. 1.5 1.5 2 2.5 3 4 5 6 8 10
Max. 1.580 1.580 2.080 2.580 3.080 4.095 5.140 6.140 8.175 10.175
Min. 1.520 1.520 2.020 2.520 3.020 4.020 5.020 6.020 8.025 10.025
t Min. 0.7 1 1.1 1.3 2 2.5 3 4 5 6
w Min. 0.55 0.55 0.85 1.15 1.4 1.9 2.3 3.3 4 4.8
Wt./1000 - - - - - - - - - -
Thd. length b Ref. - - - - - - - - - -
Thd. size
d		 (M14) M16 M20 M24 M30 M36 M42 M48 M56 M64
P Pitch 2 2 2.5 3 3.5 4 4.5 5 5.5 6
dk Max. Smooth head 21 24 30 36 45 54 63 72 84 96
Knurled head 21.33 24.33 30.33 36.39 45.39 54.46 63.46 72.46 84.54 96.54
Min. 20.67 23.67 29.67 35.61 44.61 53.54 62.54 71.54 83.46 95.46
da Max. 15.7 17.7 22.4 26.4 33.4 39.4 45.6 52.6 63 71
ds Max. 14 16 20 24 30 36 42 48 56 64
Min. 13.73 15.73 19.67 23.67 29.67 35.61 41.61 47.61 55.54 63.54
e Min. 13.716 15.996 19.437 21.7374 25.150 30.854 36.571 41.131 46.831 52.531
k Max. 14.00 16.00 20.00 24.00 30.00 36.00 42.00 48.00 56.00 64.00
Min. 13.57 15.57 19.48 23.48 29.48 35.38 41.38 47.38 55.26 63.26
s Nom. 12 14 17 19 22 27 32 36 41 46
Max. 12.212 14.212 17.23 19.275 22.275 27.275 32.33 36.33 41.33 46.33
Min. 12.032 14.032 17.05 19.065 22.065 27.065 32.08 36.08 41.08 46.08
t Min. 7 8 10 12 15.5 19 24 28 34 38
w Min. 5.8 6.8 8.6 10.4 13.1 15.3 16.3 17.5 19 22
Wt./1000 - - - - - - - - - -
Thd. length b Ref. - - - - - - - - - -

Hexagon Socket Head Cap Screw — Product Description

The hex socket head cap screw is a fastener with a cylindrical head featuring a hexagon socket recess. It is typically driven using an hex key (Allen wrench). The screw is threaded into pre-tapped holes or used with nuts to secure components together. This product conforms to GB/T 70.1 (equivalent to ISO 4762 and DIN 912), with thread sizes ranging from M1.6 to M64, and performance classes including 8.8, 10.9, 12.9 for carbon steel, as well as stainless steel grades A2-70 and A4-80. The high head strength allows the application of substantial tightening torque, making it widely used in mechanical equipment, automobiles, molds, electronics, hydraulic and pneumatic systems, and general industrial assembly.

1. Product Features

  • Cylindrical head structure: The head is cylindrical with a hex socket recess on top. Head diameter and height follow standard series, allowing countersunk installation for a flush surface.
  • Hex socket drive: Operated with an hex key, distributing force evenly and resisting cam-out, ideal for space-constrained applications or situations requiring high tightening torque.
  • Complete specifications and grades: Thread sizes from M1.6 to M64, carbon steel performance classes 8.8, 10.9, 12.9, and stainless steel A2-70 and A4-80.
  • Diverse materials and surface finishes: Available in carbon steel, alloy steel, stainless steel, brass, and more. Surface finishes include blackening, zinc plating, Dacromet, and Geomet.
  • Optional thread forms: Full thread or partial thread available; partial thread offers superior shear resistance.

2. Product Advantages

  • High preload capacity: The large contact area of the hex socket withstands high tightening torque, ideal for high-strength, high-reliability connections.
  • Suitable for confined spaces: The hex key can be applied from above or the side, saving space compared to hex head bolts.
  • High head strength: The large cylindrical head cross-section resists stripping or deformation, allowing repeated assembly and disassembly.
  • Flush surface after installation: The head can be countersunk, reducing protrusion and improving appearance.
  • Standardized interchangeability: Unified dimensions allow products from different suppliers to be interchangeable, simplifying procurement and maintenance.
  • Reliable anti-loosening: Combined with thread lockers, self-locking nuts, or washers, it meets anti-loosening requirements in vibrating conditions.

3. Areas of Application

  • Mechanical equipment: Fastening of machine tools, gearboxes, pumps, valves, automation equipment, compressors, and other components.
  • Automobiles and motorcycles: Connections in engines, transmissions, chassis, body accessories, and interior components.
  • Molds and tooling: High-strength, countersunk installations in mold plates, fixtures, and gauges.
  • Electronics and appliances: Fastening of chassis, cabinets, small appliances, instrument enclosures, and internal components.
  • Hydraulics and pneumatics: Compact connections in valve blocks, hydraulic cylinders, pneumatic cylinders, and pump stations.
  • General industry and maintenance: Steel structures, shelving, pipe flanges, furniture hardware, and everyday repair assembly.
FAQ

Procurement Questions

Common procurement questions about specification, material, finish and delivery.

Please confirm the application position, load, connection thickness and working environment first, then match diameter, length, thread pitch, material, strength grade, surface finish and applicable standard. Drawings, photos or old samples help us quote more accurately.

Hot-dip galvanizing and Dacromet are common choices for outdoor applications. For humid, coastal or chemical environments, stainless steel 304/316 or higher corrosion-resistant solutions may be better.

Please provide drawings or 3D files, material, dimensions, tolerance, grade, surface treatment, packing method and quantity. If drawings are not ready, samples or installation photos can also be reviewed.

Bolts and nuts should match nominal diameter, thread pitch, thread type, standard and strength grade. High-strength connections should also use suitable washers and anti-loosening solutions.

APPLICATIONS

Application Scenarios

Choose material, grade and surface treatment based on real working conditions.

Construction

Steel structures, curtain walls, embedded parts and site assembly.

Machinery

Equipment assembly, maintenance parts and frame fixing.

Solar Mounting

Outdoor brackets, corrosion resistance and weather exposure.

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