Arun Fastener Company Ltd

Arun Fastener Company Ltd Arun Fasteners are Imperial & Metric suppliers. A trusted business for many years, we are stockists of an enviable range of fasteners, for next day delivery.

Specialists in rare threads and sizes, Metric, Metric Fine, UNF, UNC, BSF, Whitworth and BA

⚡️🔩 FASTENER FACTS 🔩⚡️Why do bolt heads have markingsThose marks are not decoration!They identify the manufacturer, and ...
03/09/2026

⚡️🔩 FASTENER FACTS 🔩⚡️

Why do bolt heads have markings

Those marks are not decoration!

They identify the manufacturer, and in many cases, the strength grade of the fastener.

A quick look can tell you what you need to replace.

✅️ Metric = 8.8, 10.9, 12.9
✅️ UNC or UNF = 5 or 3 lines
✅️ Whitworth and BSF = R

www.arunfasteners.co.uk

'bolts

"I'm sure I've got one somewhere..."A box full of random screws might feel like a treasure chest... until you need the e...
24/08/2026

"I'm sure I've got one somewhere..."

A box full of random screws might feel like a treasure chest... until you need the exact one for the job.

Wrong size? Wrong thread? Wrong material?

Shop for the RIGHT fasteners - next day delivery and click & collect

www.arunfasteners.co.uk

⚡️🔩 FASTENER FACTS 🔩⚡️What does Nyloc actually mean??A Nyloc nut contains a nylon insert that grips the bolt thread, hel...
20/08/2026

⚡️🔩 FASTENER FACTS 🔩⚡️

What does Nyloc actually mean??

A Nyloc nut contains a nylon insert that grips the bolt thread, helping prevent loosening caused by vibration.

The nylon insert is designed for repeated reliability - but should not usually be reused in critical applicatons.

# maintenance

⚡️🔩 FASTENER FACTS 🔩⚡️UNC and Whitworth: Same TPI... almost!UNC and Whitworth can appear very similar because many sizes...
13/08/2026

⚡️🔩 FASTENER FACTS 🔩⚡️

UNC and Whitworth: Same TPI... almost!

UNC and Whitworth can appear very similar because many sizes have the same threads per inch (TPI)

The famous exception

💠UNC = 13 tpi
💠Whitworth = 12 tpi

So UNC can be used instead of hard to find Whitworth bolts (luckily we stock a large range of both 😉)

⚡️🔩 FASTENER FACTS 🔩⚡️Washers do more than spread the loadA washer can:✅️ Spread clamping force✅️ Protect surfaces✅️ Red...
06/08/2026

⚡️🔩 FASTENER FACTS 🔩⚡️

Washers do more than spread the load

A washer can:

✅️ Spread clamping force
✅️ Protect surfaces
✅️ Reduce damage to softer materials
✅️ Improve joint reliability

⚡️🔩 FASTENER FACTS 🔩⚡️What does 8.8 mean on a bolt headThe markings on a metric bolt head show its strength grade - not ...
30/07/2026

⚡️🔩 FASTENER FACTS 🔩⚡️

What does 8.8 mean on a bolt head

The markings on a metric bolt head show its strength grade - not its size.

For example:

M10 x 50mm 8.8 bolt

M10 = diameter
50mm = length
8.8 = strength class

A grade 8.8 bolt has a tensile strength of approximately 800 MPa.

We also stock higher tensile bolts in 10.9 and 12.9

⚡️🔩 FASTENER FACTS 🔩⚡️A nut does not need to be as strong as the bolt!In many applications, the nut is intentionally des...
23/07/2026

⚡️🔩 FASTENER FACTS 🔩⚡️

A nut does not need to be as strong as the bolt!

In many applications, the nut is intentionally designed to be slightly softer than the bolt. This helps prevent damage to the bolt threads and allows the nut to deform slightly for a secure joint.

⚡️🔩 FASTENER FACTS 🔩⚡️Stainless steel is not just "rust proof"A2 and A4 stainless steel resists corrosion because they f...
20/07/2026

⚡️🔩 FASTENER FACTS 🔩⚡️

Stainless steel is not just "rust proof"

A2 and A4 stainless steel resists corrosion because they form a thin passive oxide on the surface.

A4 stainless is often chosen for harsher environments because it contains molybdenum, improving resistance to corrosion, especially from salt water.

🔩⚡️FASTENER FACTS⚡️🔩A fine thread has more threads per inch (or finer pitch than a course thread, giving it greater tens...
17/07/2026

🔩⚡️FASTENER FACTS⚡️🔩

A fine thread has more threads per inch (or finer pitch than a course thread, giving it greater tensile stress area and better resistance to loosening from vibration.

We stock a range of course thread bolts with matching nuts - UNC, WHITWORTH and Metric standard

And fine thread - UNF, BSF and Metric Fine

www.arunfasteners.co.uk

We’re pleased to announce that BSF (British Standard Fine) engineering studs are now available at Arun Fasteners.Now in ...
11/02/2026

We’re pleased to announce that BSF (British Standard Fine) engineering studs are now available at Arun Fasteners.

Now in stock:
✔ 3/16" BSF. ✔ 1/4" BSF, ✔ 5/16" BSF, ✔ 3/8" BSF

Perfect for classic car restoration, vintage machinery, and specialist engineering projects where imperial threads matter.

https://arunfasteners.co.uk/product/bsf-engineering-studs/

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Address

Unit 2-3, Ford Industrial Estate
Arundel
BN180DF

Opening Hours

Monday 8:30am - 5pm
Tuesday 8:30am - 5pm
Wednesday 8:30am - 5pm
Thursday 8:30am - 5pm
Friday 8:30am - 4:30pm

Telephone

+441243551484

Website

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