Hex Head Bolts

  • Hex Head Bolts Manufacturer & Supplier

Hex head bolts, or hexagonal machine bolts, hex screws, are a common type of removable threaded fastener, consisting of an external hexagonal head and a threaded shank. They are used with pre-threaded holes or nuts. Hex bolts are available in full-thread and partial-thread types. The hexagonal head design allows tightening with wrenches or socket tools from multiple angles.

Send Inquiry

Specifications

FormingHot forging, cold heading.
DiameterM1.6 to M100 (metric), or 1/4 inch to 4 inches (imperial).
Length2mm to 1000mm (customized).
Thread TypesUNC thread, UNF thread, ISO thread, Metric coarse thread, metric fine thread, and imperial threads, full thread, half thread, reverse thread.
MaterialCarbon Steel, stainless Steel, alloy Steel, copper Alloy, nickel-Chromium Alloy.
StrengthGrade 4.6, 4.8, 5.8, 8.8, 10.9, 12.9; A2-70, A2-80, A4-70, A4-80; ASTM A307, A354, A449.
SurfaceElectroplated colored zinc, eco-friendly colored zinc, eco-friendly black zinc, eco-friendly blue-white zinc, electroplated matte tin, glossy tin, copper plating, zinc-nickel alloy, tin-zinc alloy, Dacromet coating, zinc-aluminum coating, etc.
StandardISO, DIN, ASME, PN, IFI, SAE, EN, JIS.
PakagingPlastic bags, plastic boxes, color boxes, medium boxes, large boxes, pallets.

Hex Head Bolts Manufacturer

Stellzin is a professional hex head bolts manufacturer and supplier in China. Stellzin offers imperial and metric hex head bolts in various materials, sizes, and finishes.

Stellzin supplies full-size hexagon bolts in accordance with ISO, DIN, BS, PN, ASME, JIS and other international standards.

  • Strict standards.
  • Full size.
  • Fast delivery.
  • Customizable.
  • Affordable
  • Quality materials

Hex Bolt Dimensions

Bolt DiameterDFCH
Body DiameterWidth Across FlatsWidth Across CornersHeight
MaxBasicMaxMinMaxMinBasicMaxMin
1⁄20.5153⁄40.7500.7250.8660.82611⁄320.3640.302
5⁄80.64215⁄160.9380.9061.0831.03327⁄640.4440.378
3⁄40.76811⁄81.1251.0881.2991.2401⁄20.5240.455
7⁄80.89515⁄161.3121.2691.5161.44737⁄640.6040.531
11.02211⁄21.5001.4501.7321.65343⁄640.7000.591
11⁄81.149111⁄161.6881.6311.9491.8593⁄40.7800.658
11⁄41.27717⁄81.8751.8122.1652.06627⁄320.8760.749
13⁄81.40421⁄162.0621.9942.3822.27329⁄320.9400.810
11⁄21.53121⁄42.2502.1752.5982.48011.0360.902
15⁄81.65827⁄162.4382.3562.8152.61613⁄321.1160.978
13⁄41.7852-5/82.6252.5383.0312.89315⁄321.1961.054
17⁄81.912213⁄162.8122.7193.2483.09911⁄41.2761.130
22.03933.0002.9003.4643.306111⁄321.3881.175
21⁄42.30533⁄83.3753.2623.8973.71911⁄21.5481.327
21⁄22.55933⁄43.7503.6254.3304.133121⁄321.7081.479
Dimensions per ASME B18.2.1

Hex Head Bolts Manufacturing Process

  • Coil: Raw material (carbon steel, alloy steel) for the manufacture of bolts, supplied in coils.
  • Annealing: Eliminate internal stresses in wire processing and increase its forgeability.
  • Acid washing: remove the oxide film on the surface of the wire, and surface lubrication to facilitate the drawing of wires.
  • Drawing: Cold drawing of coiled wire to the required wire diameter .
  • Beating (molding): The wire is cold forged (or hot forged) to achieve the shape and length (or thickness) of the semi-finished product.
  • Rolling: Rolling or tapping the molded semi-finished product to achieve the desired thread.
  • Heat treatment: Changing the mechanical properties of a screw.
  • Plating: according to the requirements of the surface treatment, such as increasing the screw’s anti-rust, beautiful and so on.
  • Packing: Plastic box, carton, pallet or customized packing.

Applications

Hex head bolts are widely used in machinery manufacturing, construction engineering, automotive industry, energy and power, bridges, docks, transportation, electronics, and home appliances. In machinery and construction, hex bolts provide reliable fastening for heavy equipment and steel structures. In automotive and energy applications, high-grade bolts such as 8.8, 10.9, and 12.9 deliver the strength required for demanding loads. Stellzin also supports customized hex bolts for electronics, home appliances, and other specific applications.

Hex Bolts Standards

ISO 4014ISO 4018ISO 7412DIN 960DIN 65339DIN 931
ISO 4015ISO 8765DIN 601DIN 961DIN 933DIN 7968
ISO 4016ISO 8676DIN 610DIN 609DIN 558DIN 7990
ISO 4017ISO 7411DIN 6914DIN 65526DIN 7964DIN 43165
ASME/ANSI B18.2.3.1MJIS B 1180EN 24014DIN 7999EN 24017ASME/ANSI B18.2.3.3M
EN 3007ASME/ANSI B18.2.3.7MASME/ANSI B18.2.1ASME/ANSI B18.2.6ASME/ANSI B18.2.3.5M

Types of Hex Head Bolts

Hex-Head-Bolt-with-Zinc-Plated-Washer

Galvanized Hex Bolt with Washers

Get a Quote
Full-Thread-Hex-Bolt

Fully Threaded Hex Bolt

Get a Quote
Partial-Thread-Hex-Bolt

Partial Threaded Hex Bolt

Get a Quote
Brass Hex Bolt

Brass Hex Bolt

Get a Quote
Hex-Bolt-with-Split-Pin-Hole-on-Shank

Hex Bolt with Split Pin Hole on Shank

Get a Quote
Hex-Bolt-with-Wire-Hole-on-Head

Hex Bolt with Wire Hole on Head

Get a Quote
Titanium-Hex-Bolt

Titanium Hexagon Bolt

Get a Quote
nylon hex bolt

Nylon Hex Bolt

Get a Quote

Hex Head Bolts: FAQ Guide

  • Coarse thread: suitable for general connection, easy to install.
  • Fine thread: suitable for occasions with high vibration, good anti-loosening performance.

If the thread is damaged, broken, loose, etc., appropriate treatment measures must be taken according to the specific circumstances.

  • Visual Inspection: Check for head misalignment and uniformity of the coating.
  • Go/No-Go Gauge: Test whether the threads meet standard specifications.
  • Hardness Test: Verify if the strength grade meets the required standards.
  • Use locking nuts, such as nylon-insert lock nuts.
  • Add spring washers or use a double-nut arrangement.
  • Apply thread-locking adhesive to enhance anti-loosening performance.

Hex head bolts are available in carbon steel, stainless steel, alloy steel, copper alloy, and nickel-chromium alloy. Stellzin supplies both metric and imperial sizes with custom surface treatments to match your application.

Stellzin supplies hex bolts in grades 4.6, 4.8, 5.8, 8.8, 10.9, and 12.9, stainless steel grades A2-70, A2-80, A4-70, and A4-80, and ASTM A307, A354, and A449, in accordance with ISO, DIN, ASME, JIS, and other international standards.