Hex bolts and nuts, exported from India to the US, UK and beyond.
BuildMart 93 supplies hexagon head bolts and matching nuts to international buyers in both metric (DIN 931 / 933, ISO 4014 / 4017) and inch (ASTM, SAE) standards, across mild steel, high tensile and stainless grades, with the finishes and certification your market requires.
Hex Bolt & Nut Spec
Bolts and nuts, supplied as a matched set to the right standard.
Hex bolts and nuts are the workhorse of structural and general fastening. The detail that matters for an importer is the pairing: the right bolt grade with the right nut class, in the standard and finish a project specifies. We supply to both the metric and inch systems, so a UK fabricator on DIN bolts and a US distributor on ASTM structural bolts can both be served from one enquiry.
These are also called hexagon bolts, hex head bolts, hex cap screws and finished hex nuts. Whatever the term, the details we need are the same: diameter and length, partial or full thread, the bolt grade and matching nut class, the standard and the finish. Share those and we can confirm feasibility, price and lead time quickly.
Standards, sizes, grades and finishes.
Typical export availability is shown below. Non-standard sizes, grades and lengths can usually be sourced on request.
| Also known as | Hex bolts, hexagon head bolts, hex cap screws, hex nuts, finished hex nuts |
|---|---|
| Bolt standards (metric) | DIN 931 (partial thread), DIN 933 (full thread), ISO 4014 / 4017 |
| Nut standards (metric) | DIN 934, ISO 4032 (hex nuts); DIN 985 (nylon-insert lock nuts) |
| Inch / US standards | ASTM A307 Gr A/B (general), ASTM A325 / F3125 (structural), SAE J429 Gr 2/5/8; nuts to ASTM A563 |
| Diameter range | M5 to M36 (metric) · ¼″ to 1½″ (inch) · larger on request |
| Bolt property classes | 4.6 (mild steel), 8.8, 10.9, 12.9 (high tensile) |
| Nut property classes | Class 8, 10, 12 - matched to the bolt grade |
| Stainless options | A2-70 / A4-80 (SS 304 / SS 316) |
| Finishes | Plain / self-colour, electro-zinc plated, hot-dip galvanized (HDG) |
| Thread | Metric coarse · UNC / UNF for inch series |
For US buyers
Inch sizes with UNC / UNF threads to ASTM and SAE standards - A307 for general grade, A325 / F3125 for structural steel connections, and SAE J429 grades 2, 5 and 8 - paired with ASTM A563 nuts. Hot-dip galvanizing is available for structural and exterior use.
For UK & Europe
Metric hex bolts to DIN 931 / 933 and ISO 4014 / 4017 with DIN 934 nuts, in property classes 8.8 and 10.9, with bright zinc-plated or hot-dip galvanized finishes, plus stainless A2 / A4 where corrosion resistance matters.
Where hex bolts and nuts are used.
From structural steel to machinery assembly, this is the fastener that turns up on almost every project - which keeps export demand steady.
Structural Steel
Beam, column and bracing connections in steel-framed buildings and structures.
Construction & Infrastructure
Bridges, towers, civil works and heavy infrastructure needing galvanized or high-tensile bolting.
Machinery Assembly
Securing equipment, frames, flanges and components in manufacturing and plant.
Fabrication & Engineering
General fabrication, jigs, fixtures and engineered assemblies across industries.
Maintenance & MRO
Replacement bolting and fastening for repair, overhaul and maintenance teams.
General Fixing
Distributor and stockist supply for everyday industrial and trade fastening needs.
What to send for an accurate export quote.
The more of these you can share up front, the faster we can confirm feasibility, price and lead time.
Hex bolt & nut export questions.
Common questions from importers, distributors and project buyers in the US, UK and other markets.
What is the difference between DIN 931 and DIN 933?
DIN 931 hex bolts are partially threaded (a plain shank under the head), while DIN 933 hex bolts are fully threaded up to the head. Both come in the same diameters, grades and finishes; the choice depends on the joint.
Do the nuts come matched to the bolt grade?
Yes. Nuts are supplied in property classes matched to the bolt - for example class 8 or 10 nuts with 8.8 or 10.9 bolts - so the assembly performs as intended. Stainless nuts are matched in A2 or A4.
Do you supply structural hex bolts to ASTM A325 / F3125 for the US?
Yes. Alongside metric DIN and ISO bolts, we supply inch-series structural and general hex bolts to ASTM standards, including A307, A325 / F3125 and SAE J429 grades, with ASTM A563 nuts.
What is the minimum order for export?
Exports generally need a minimum of about 1 tonne (or 1 CBM) per item to be viable once packaging and shipping are accounted for. Share your specification and target quantity and we'll confirm the details.
Request a hex bolt & nut export quote.
Share your size, standard, grade, finish, quantity and destination, and we'll review feasibility and revert with sourcing details and pricing. Enquiries from the US, UK and Europe are welcome.