Hex Bolts
The universal workhorse of structural fastening — a six-sided head driven by a spanner or socket, manufactured in full-thread, half-thread, alloy and stainless configurations to international standard.
Larger sizes: 3–5 working days
What is a
Hex Bolt?
Hex Bolt is a fully threaded metric fastener manufactured to DIN, ISO and IS standards for reliable, high-strength fastening. Featuring a hexagonal head for efficient torque application, it is available in various materials, finishes, and property classes to suit diverse mechanical and corrosion resistance requirements. Widely used in construction, machinery, automotive, and general engineering, it delivers secure, durable, and dependable fastening across a broad range of industrial applications.
What material
is it?
Stocked in three grades to match load and environment. Grade 8.8 high-tensile covers general structural and mechanical assembly. Grade 10.9 high-tensile is specified for heavy-duty and shock-load applications where higher proof load is essential. SS 304 & SS 316 is used where corrosion resistance is the priority — coastal, food-grade, or chemical-exposure environments. Grade 12.9 is also available against specific enquiry.
Technical Drawing &
Dimensional Tolerances
| Grade | d | Pitch (mm) |
Across Flat — s (mm) | e min (mm) |
Head Thickness — k (mm) | |||
|---|---|---|---|---|---|---|---|---|
| min | max | nom | min | max | ||||
| SS 304 SS 316 |
M3 | 0.50 | 5.32 | 5.50 | 6.01 | 2.00 | 1.88 | 2.13 |
| 8.8 10.9 |
M4 | 0.70 | 6.78 | 7.00 | 7.66 | 2.80 | 2.68 | 2.93 |
| M5 | 0.80 | 7.78 | 8.00 | 8.79 | 3.50 | 3.35 | 3.65 | |
| M6 | 1.00 | 9.78 | 10.00 | 11.05 | 4.00 | 3.85 | 4.15 | |
| M8 | 1.25 | 12.73 | 13.00 | 14.38 | 5.30 | 5.15 | 5.45 | |
| M10 | 1.50 | 15.73 | 16.00 | 17.77 | 6.40 | 6.22 | 6.58 | |
| M12 | 1.75 | 17.73 | 18.00 | 20.03 | 7.50 | 7.32 | 7.68 | |
| M14 | 2.00 | 20.67 | 21.00 | 23.36 | 8.80 | 8.62 | 8.98 | |
| M16 | 2.00 | 23.67 | 24.00 | 26.75 | 10.00 | 9.82 | 10.18 | |
| SS 304 SS 316 |
M18 | 2.50 | 26.67 | 27.00 | 29.56 | 11.50 | 11.29 | 11.72 |
| M20 | 2.50 | 29.67 | 30.00 | 33.53 | 12.50 | 12.29 | 12.72 | |
| M22 | 2.50 | 33.38 | 34.00 | 37.29 | 14.00 | 13.79 | 14.22 | |
| M24 | 3.00 | 35.38 | 36.00 | 39.98 | 15.00 | 14.79 | 15.22 | |
All dimensions in mm · DIN 933 / ISO 4017 · s = across flats · e = across corners (min) · k = head thickness · M18–M24 in SS 304/316 only
- DIN 933 — German standard for fully-threaded hex bolts. Threads run the full shank length. Widely recognised internationally.
- DIN 931 — German standard for partially-threaded hex bolts. Unthreaded shank section gives better shear strength in structural joints.
- ISO 4017 / ISO 4014 — International equivalents of DIN 933 / DIN 931. Accepted globally; preferred in cross-border supply chains.
- IS 1364 — Bureau of Indian Standards specification. Required for government and PSU procurement in India.
- Property class 10.9 conforms to ISO 898-1 / IS 1367.
- Standard finish: manganese coating with rust-preventive oil. Plated finishes on request.
What sizes
are available?
Standard stocked range spans M4 to M16 in lengths from 8mm to 150mm. Sizes outside this matrix are available against a minimum order quantity.
SS 304/316 is also available in M2, M2.5, M3, M18, M20, M22, M24 — enquire for pricing and lead time.
| Length | M4 | M5 | M6 | M8 | M10 | M12 | M14 | M16 |
|---|
✓ indicates a stocked combination. Sizes outside this matrix can be sourced against a minimum order quantity — ask us on WhatsApp.
What applications
is it suitable for?
Hex bolts are commonly used in machinery assembly, structural steel fabrication, automotive components, construction projects, industrial equipment, agricultural machinery, electrical enclosures, HVAC systems, and general engineering applications. Their full-thread design provides excellent grip when fastening thinner materials or when used with nuts and washers, making them ideal for precision assemblies and maintenance work.