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Free Saturday Delivery on orders over £75

Product Details

• Ideal for MDF / all fibre boards / chipboard, matches most common board sizes.

• Clamps the boards fast
• Will not pull apart under load
• Does not blister the board on insertion

Technical Specification
Brand MDF-Tite
Width (mm) 3.9
Manufacture ID TFMT3940
Length (mm) 40
Diameter (mm) 3.9
Delivery details
Order value: Under £10 £10 & over
Express usually Next Business Day before 6pm £5 Free
Turbo usually Next Business Day before 12 noon £10 £5
Remote areas standard delivery (2-4 days) £5 Free
Order Value: Under £25 Over £25 but less than £75 £75 & Over
£10 £5 Free

Please note items delivered by our suppliers are not available for the options above. Delivery times may vary.

More about Delivery & Returns
Click & Collect details
If you are using our Click & Collect service please note the following:
  • Order online or over the phone and collect in branch from 5 minutes later.
  • Ensure you check stock is available for collection at your chosen branch.
  • Check branch opening hours to ensure you have sufficient time to collect.
  • For items not available for same day collection, place order before 9pm Mon-Fri (4pm Sun) and you can collect Next Business Day (Mon-Fri) after 3pm.
  • If we have your mobile number, we’ll send you a text when your order is ready to collect.
MDF-Tite Tri-Lock Pozi Screw 3.9 x 40mm (200 Pack) is rated 4.0 out of 5 by 9.
Rated 5 out of 5 by from Time saving excellent screw Bought these to make some 18mm MDF cabinets and have not been disappointed. They drive straight through the board and into the edge of the adjoining one without pre-drilling and without splitting. They do emit a significant squealing sound which can be a bit disconcertingm but a pilot hole eliminates this if required.
Date published: 2020-02-03
Rated 5 out of 5 by from Tight hold Bought these to join two pieces of MDF for a bath panel. Used 7 screws into 3mm drilled holes and was very happy to see that the panels were solidly fixed together.
Date published: 2019-12-24
Rated 5 out of 5 by from Awesome screw for Mdf Great screw for mdf, I still pilot a hole to avoid potential for splitting, but the hold on these is far superior to others I've used.
Date published: 2019-10-29
Rated 5 out of 5 by from Great screws Really excellent screws, have used several times now, and not just for mdf, and always perfect result.
Date published: 2019-09-10
Rated 4 out of 5 by from MDF screw Good screws, work well, but need a pilot hole drilled first to stop MDF splitting.
Date published: 2018-09-10
Rated 1 out of 5 by from Don't waste your money! THE SCREWS DID NOT PULL INTO MDF AS DESCRIBED.
Date published: 2018-06-21
Rated 5 out of 5 by from Excellent screw! Bought these for a project using MDF around a framed carcass. They fix very well indeed and for my project left a great finish. I used them mainly on face to face joints and they have held together really well. I was so impressed in fact I have bought other screws from the same brand for other projects which have all worked excellently too.
Date published: 2017-01-03
Rated 1 out of 5 by from Better options are available Purchased to build some mdf furniture, an assortment of desks and drawers. I noticed these and thought I'd give them a try. Wish i hadn't bothered. They either split the wood or didn't pull in. I used 4.0 x 50mm reisser cutters instead piloted with a 3mm bit. The thread is so sharp and deep on them that they cut in deep without splitting the wood. On account of this they pull in and hold well. The ribs under the head cut in when you screw flush with the surface so that they dont cause the wood to bulge. In comparison these are a total waste of time.
Date published: 2016-12-09
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