Emfast Limited

The only place to go for all your fastener requirements

With over 40,000 items in stock

available for immediate dispatch all with free delivery

 by Royal Mail Tracked 48 or Evri

Socket Button (Dome Head) Screw (Allen Key Drive)

High Tensile Steel Grade ANSIB18.3

Thread UNC (Unified National Coarse Also known as American Coarse)

Available in size 1/4 UNC x 3/4 Inch long

 Black Oxide (Non-Plated) Finish in various pack sizes

Please choose using the drop-down menu

Please checkout our eBay shop if you need a different length or any other items

Further technical information below.

1/4 UNC

Threads Size – 1/4 Inch

Screw Length – 3/4 Inch

Screw Diameter – 0.243-0.250 Inch

Threads Per Inch – 20

Head Diameter – 0.419-0.437 Inch

Head Depth – 0.122-0.132 Inch

Hex Diameter – 0.1562-0.1587 Inch

Hex Depth – 0.087 Inch

Allen Key Size – 5/32 Inch

All screws are measured from under the head to the end of the screw

About us

Emfast Limited is a family-owned and run company and was founded in 1990 

with over 150 years' experience in the engineering sector

All Fasteners we sell are from globally recognised manufacturers and meet all

international quality standards in terms of strengths, dimensional and materials

  We ship world-wide, and supply to end-users and companies large and small

Emfast supplies a wide range of fasteners and fittings to the automotive, aerospace, defence, engineering, and motorsport sectors

All our listings include VAT at the current rate and a VAT invoice can be supplied upon request

Shipping

All orders come with free standard delivery with upgraded options available at a small charge

We use Royal Mail, Yodel, Evri and APC

We aim to dispatch all orders same day Monday to Friday when ordered by 4pm

We hope your items are delivered by the estimated arrival date supplied

 by the delivery company however this cannot be guaranteed

To ensure you receive your order as quickly as possible

we will on some occasions dispatch orders by an alternative delivery partner 

this is normally down to size/weight or if after chosen couriers collection time

Contact Information

If you need any assistance, feel free to drop us an email or call our sales team between

 8.30am and 4.30pm Monday to Friday who will do their best to help you

 (Ebay messages are checked regularly seven days a week)

(except for public bank holidays and our shutdown period in between Christmas and New Year)

Returns

 Items must be returned unopened and unused and return postage to us is at buyers cost and risk

If you wish to return an item, please start a return on eBay

A small handling charges will be incurred for items returned that are not due to fault of the seller

e.g: ordered by mistake, wrong size ordered etc