Frequently Asked Questions

Frequently Asked Questions

Materials and grades

What's the difference between A2 and A4 stainless steel?
A2 (also called 304) is our everyday workhorse grade - excellent corrosion resistance for indoor, outdoor and workshop applications. A4 (316) is marine grade - it contains added molybdenum which dramatically improves resistance to chloride pitting from salt water. Use A4 for anything within 5km of the coast, marine fittings, or in salt-spray environments. A2 for everything else.

Are all your fasteners stainless steel?
Yes. Every product in the Simfix range is A2 (304) or A4 (316) stainless steel - no mild steel, no zinc-plated carbon steel.

What's the load rating of your bolts?
Our bolts conform to standard DIN / ISO mechanical property specs for the grade shown. For example, DIN 933 A2 hex set screws meet A2-70 property class as standard. For specific tensile/yield data on a given size, contact contact@simfix.com.

Sizing

How do I read fastener sizes?
Sizes use the M-code system: M[diameter] × [length in mm]. For example, M8 × 30 is 8mm thread diameter, 30mm long under the head. For nuts and washers, only the diameter applies (e.g. M10). Our Size Guide has the full reference.

What's a DIN / ISO / BS standard?
These are international engineering standards that fix the dimensions, head shape, thread profile and tolerances of a fastener. Same standard from any reputable supplier means an identical part - interchangeable. Our Material Guide explains the most common standards.

Delivery

How fast is delivery?
Orders placed before 4pm, Monday to Friday, are typically dispatched the same working day. Delivery options and costs are shown at checkout before you pay, including Standard Delivery and Next Working Day Delivery where available.

Do you ship internationally?
Available delivery services are confirmed at checkout based on the delivery address entered.

Is delivery tracked?
Yes - every order ships with full tracking. You'll get a notification email with the tracking link as soon as your order leaves us.

Pack sizes and Trade pricing

What's the difference between DIY and Trade packs?
Every product is available in two sizes: a smaller DIY pack (typically 10-25 pieces) for one-off jobs and a larger Trade pack (typically 50-500 pieces) at a lower unit price for bigger runs. You select the pack size as a variant on each product page.

Do I need a Trade account?
No. Trade pack pricing is built into the variant - anyone can order any pack size with no application or approval. See our Trade Account page for more on bigger orders and bespoke quotes.

Returns

Can I return what I ordered?
Yes - no return is required. Contact us within 30 days of delivery for a full refund or replacement. See our Refunds page for the process.

What if I ordered the wrong size?
Email contact@simfix.com within 30 days of delivery with your order number and what went wrong. We will sort a full refund or replacement where preferred.