Frequently Asked Questions
Frequently Asked Questions
Tap a question to open the answer. This FAQ page is designed to help you answer any of your fastener needs! If you still need help, email contact@simfix.com.
Fastener Materials and grades FAQ
What's the difference between A2 and A4 stainless steel?
A2, also called 304, is our everyday workhorse grade with excellent corrosion resistance for indoor, outdoor and workshop applications. A4, also called 316, is marine grade and contains added molybdenum for better resistance to chloride pitting from salt water.
Use A4 for coastal, marine, wet or salt-spray environments. A2 suits most other jobs.
Are all Simfix fasteners stainless steel?
Yes. Every product in the Simfix range is A2 (304) or A4 (316) stainless steel. We do not sell mild steel or zinc-plated carbon steel as a substitute.
What's the load rating of your bolts?
Our bolts conform to the standard DIN or ISO mechanical property specification for the grade shown. For example, DIN 933 A2 hex set screws meet A2-70 property class as standard.
For specific tensile or yield data on a given size, contact contact@simfix.com.
Fastener Sizing FAQ
How do I read fastener sizes?
Fastener sizes use the M-code system: M[diameter] x [length in mm]. For example, M8 x 30 is 8mm thread diameter and 30mm long under the head.
For nuts and washers, only the diameter applies, such as M10. Our Size Guide has the full reference.
What's a DIN, ISO or BS standard?
These are engineering standards that define dimensions, head shape, thread profile and tolerances. Matching the same standard from a reputable supplier means the part is interchangeable.
Our Material Guide explains the common stainless steel grades.
Delivery
Do you offer free next-day delivery?
Yes. Next-day delivery is free on orders over £50. For orders under £50, next-day delivery is £3.95.
How fast do you dispatch orders?
Orders placed before 4pm Monday-Friday are typically dispatched the same working day. Delivery options and costs are shown at checkout before you pay.
Is delivery tracked?
Yes. Every order ships with tracking. You will receive a notification email with the tracking link as soon as your order leaves us.
Checkout and payment
Is checkout secure?
Yes. Simfix checkout is protected by SSL encryption, so the information you enter at checkout is sent securely.
Payments are processed through Shopify's secure checkout and supported payment providers. We do not store your full card details on Simfix.
Pack sizes and Trade pricing
What's the difference between DIY and Trade packs?
Every product is available in a smaller DIY pack for one-off jobs and a larger Trade pack 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, so anyone can order any pack size with no application or approval. See our Trade Account page for bigger orders and bespoke quotes.
Refunds
How do speedy refunds work?
If something is not right, contact us within 30 days of delivery and we will sort a refund or replacement quickly.
Our policy is still no-return where appropriate, but the headline is simple: we will help resolve the issue without making it difficult. See our Refunds page for the full 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 refund or replacement where preferred.