Bolts and Nuts Suppliers for Wholesale and OEM Programs

Johnny’s Hardware supplies bolts, nuts and washers as matched sets to importers, distributors and project buyers worldwide. Hex, carriage, eye, U-bolts, anchor bolts and threaded rod, with the nuts and washers that pair with them, in carbon steel property classes 4.8 through 12.9 and in stainless A2 and A4. Every quotation states the class, the standard and the finish, not just the size.

Bolts consolidate with screws, nails, anchors and wall plugs in one shipment, so a full fastener supplier range does not have to be split across several factories.

Bolts we supply

Nuts and washers

A bolt is rarely one line on an order. Most bolt programmes need the matching nut and at least one washer, which is why they are quoted together.

Property classes and grades

Grade is the specification that matters most on a bolt order, and the one most often left off it. Metric and imperial use different systems, and they do not map exactly onto each other.

Thread pitch and size conversions are covered in our screw size chart. The metric class numbers are readable rather than arbitrary. In class 8.8 the first figure is nominal tensile strength in hundreds of megapascals, so 800 MPa; the second is the ratio of yield to tensile, so yield is 0.8 x 800 = 640 MPa. Class marking is defined by ISO 898-1, and every bolt we supply above class 4.8 carries it on the head. The class also sets the tightening torque — see our bolt torque chart for values by size, grade and friction condition.

Materials and finishes

Order terms

Private label programmes and drawing-based parts are handled through our OEM hardware supplier service.

Quality control

1. Dimensional — diameter, length, thread pitch and head dimensions sampled against the cited standard
2. Thread fit — go/no-go gauging so bolts and nuts assemble without binding
3. Class marking — head markings checked against the ordered property class
4. Finish — coating type and coverage confirmed, including oversize tapping on hot-dip nuts
5. Loading — photographs taken at container loading and supplied with the documents

Frequently asked questions

What is your minimum order for bolts and nuts?

It is quoted per SKU rather than as one figure across the range, and bolts, nuts and washers count toward the same total. Most buyers combine several sizes and classes to reach a workable order without holding excess stock of any one line. Send the intended mix and we will confirm what is viable.

What does class 8.8 mean on a bolt?

The first number is nominal tensile strength in hundreds of megapascals, so 8.8 means 800 MPa. The second is the ratio of yield strength to tensile strength, so yield is 0.8 x 800 = 640 MPa. The system is defined by ISO 898-1, and the marking appears on the bolt head.

Do nuts need to match the bolt grade?

Yes. A class 8.8 bolt requires a class 8 nut, and a 10.9 bolt requires a class 10 nut. Pairing a high-class bolt with a low-class nut moves the failure point to the nut threads and wastes the bolt’s rating. We quote matched sets by default for exactly this reason.

Can you supply both metric and imperial sizes?

Yes. Metric bolts follow DIN and ISO standards, imperial follow ASME and ASTM. The two systems are not interchangeable, including the grade systems, so state which one the order uses. Where a market handles both, we quote them as separate lines rather than converting between them, because a near-equivalent grade is not the same as a matching one.

What is the difference between a hex bolt and a hex cap screw?

Dimensionally they are close, and many markets use the terms interchangeably. Strictly a hex cap screw is manufactured to tighter tolerances with a chamfered washer face, while a hex bolt is a looser commercial specification. If a drawing cites ASME B18.2.1, quote the cap screw tolerance rather than assuming the commercial bolt will pass inspection.

Why do stainless nuts seize on stainless bolts?

It is galling: the threads cold-weld under friction because stainless does not form a protective oxide fast enough while sliding. It happens most on A4 assemblies above M10 and when driving fast. Anti-seize compound, slower driving, or pairing grades that differ slightly all reduce it. Once a nut has galled it usually cannot be backed off, so the fixing has to be cut out.

Are hot-dip galvanised nuts a different size?

The nominal size is the same but the thread is tapped oversize to clear the zinc on the bolt, which is thick on hot-dip work. This is normal and specified in the standard. It also means hot-dip nuts should not be substituted onto plated bolts, where the fit becomes loose.

Can you supply mill certificates?

Yes, on request at quotation stage. Material certificates and test reports are arranged during production rather than afterwards, so tell us at the enquiry if the end customer or the market requires them. Requesting documentation after shipping is slower and sometimes not possible, because the material batch has already left the mill’s traceable window.

Choosing a bolt supplier

Most bolt problems come from an incomplete specification rather than a bad price: a class that was never stated, a nut that does not match the bolt it ships with, a hot-dip nut fitted to a plated bolt. Naming the size, property class, standard and finish together is what prevents all three. Send those four and the quotation comes back matched to the job.

Request a quotation

Send the bolt types, sizes, property classes, finishes and pack formats you need, and whether nuts and washers should be quoted as matched sets. We come back with specifications, carton data, shipping weights and lead times within 12 working hours.