Twin-threaded woodscrews with a black organic japan finish, designed for use with black ironmongery. Available in a range of gauge and length combinations. Partially threaded from 1¼ inch. Sold in boxes of 200.
Available options and pricing for Blackjax Japanned Woodscrews PZ Round Head Black Organic, with quantity selectors and a running total
Size
SKU
Price
QTY
Total
10 x 1
Jax-1
£3.79£4.55
—
10 x 11/2
Jax-2
£4.88£5.86
—
10 x 11/4
Jax-3
£4.78£5.74
—
10 x 2
Jax-4
£7.89£9.47
—
6 x 1
Jax-5
£2.38£2.86
—
6 x 3/4
Jax-6
£2.18£2.62
—
6 x 5/8
Jax-7
£1.89£2.27
—
8 x 1
Jax-8
£2.89£3.47
—
8 x 11/2
Jax-9
£3.59£4.31
—
8 x 11/4
Jax-10
£3.34£4.01
—
8 x 2
Jax-11
£4.83£5.80
—
8 x 3/4
Jax-12
£2.76£3.31
—
8 x 5/8
Jax-13
£2.69£3.23
—
Blackjax Japanned Woodscrews are twin-threaded black organic screws built specifically for use alongside black ironmongery — hinges, latches, handles and the like. The black japan finish gives a consistent, traditional appearance that sits well against period-style fittings, and the organic coating means the colour is part of the finish rather than a painted-on afterthought. These are the screws you reach for when the ironmongery on the door is black and a bright zinc screw would look completely out of place.
The Pozidriv recess makes for a clean, efficient drive with minimal cam-out, which matters when you are fitting a dozen cabinet hinges or hanging a run of internal doors and you want the heads to sit flush without any chewed-up marks. Twin threading gives good pull-through resistance in timber and MDF, and the screws bite quickly without you needing to pre-drill in most softwood situations.
Where Blackjax Japanned Woodscrews Are Used
These are a straightforward trade staple for joiners, carpenters and furniture makers working with traditional or heritage-style hardware. Cottage-style kitchens, barn conversions, period property refurbishments — anywhere the finished appearance of the fixings is as important as the fixing itself. They are also commonly used by shopfitters and cabinet makers specifying black hardware throughout, where mixing silver and black fixings would simply not pass a client walkthrough.
Part Threading on Longer Lengths
Worth noting: from 1¼ inch upwards these screws are partially threaded. That is standard practice for longer woodscrews, and it actually helps when pulling two pieces of timber together — the plain shank in the top piece lets the thread below do the drawing work properly. If you are only fixing into a single thickness, keep that in mind when selecting your length.
Sold in boxes of 200, these are priced for trade use and available across a good range of gauges and lengths to suit most common joinery applications.
Pro Tip: When fitting black ironmongery to hardwood, a quick pilot hole slightly undersized will stop the screw from shearing and keep that japan finish intact right to the head.
These screws are used primarily in joinery and carpentry where the visible fixing needs to match black ironmongery. Common applications include fitting door hinges, rim locks, cabinet hardware, barn-style door fittings, and traditional gate hardware. They suit softwood, hardwood and MDF equally well across the available size range, and they are a regular choice on heritage property refurbishments, period kitchen installations and bespoke furniture where the aesthetic detail matters as much as structural performance.
Best For
Fixing black ironmongery to timber
Door and cabinet hinge fitting
Period and heritage property joinery
Barn-style door hardware
Traditional kitchen and furniture installations
Compatible With
Softwood
Hardwood
MDF
Pozidriv (PZ) screwdriver bits
Black ironmongery and hardware
Key Features
Black organic japan finish
Twin-threaded for fast bite and pull-through resistance
Pozidriv (PZ) recess
Round head profile
Partially threaded from 1¼ inch
200 per box
Not suitable for: Not suitable for external use or exposed outdoor applications where the finish would be subject to sustained moisture. Not intended as a structural fixing in load-bearing timber connections.
Select the appropriate gauge and length for your material thickness. As a guide, the screw should enter the receiving piece by at least two thirds of its total length. In hardwood or dense MDF, drill a pilot hole to avoid splitting and to protect the japan finish on the screw head. Drive with a Pozidriv bit at a controlled speed to keep the head sitting flush without over-driving.
On lengths of 1¼ inch and above, the partial thread is normal. Position the screw so the thread engages fully in the piece being drawn into, which gives a cleaner pull and a tighter joint.
Select the correct gauge and length for the timber thickness and hardware being fixed
Mark fixing positions using the ironmongery as a template where possible
Drill a pilot hole in hardwood or dense board to prevent splitting
Use a Pozidriv bit matched to the screw size — PZ2 suits most sizes in this range
Drive at a controlled speed and stop when the head is flush with the surface
On partial-thread lengths, ensure the thread engages fully in the receiving piece for a tight draw
Are these screws suitable for outdoor use?
No. The black organic japan finish is designed for interior use alongside black ironmongery. Prolonged exposure to moisture outdoors will cause the finish to deteriorate. For external applications, look for screws with a weather-resistant coating.
Why are the longer screws only partially threaded?
Partial threading on lengths from 1¼ inch upwards is standard for woodscrews of this type. The plain shank sits in the top piece of timber while the thread bites into the receiving piece below, which creates a much tighter draw between the two. It is how the screw is designed to work, not a fault.
What screwdriver bit do these take?
These are Pozidriv (PZ) recess screws. A PZ2 bit will suit most of the sizes in this range. Make sure you are using a Pozidriv bit rather than a Phillips — they look similar but a Phillips bit will slip and damage the recess head, which is the last thing you want on a visible fixing.
Blackjax Japanned Woodscrews are manufactured with a twin-thread profile for improved pull-out resistance and faster drive in timber substrates. The black organic japan finish is applied to give a traditional, consistent appearance suited to heritage ironmongery. The round head profile and Pozidriv recess allow flush or near-flush seating on most timber surfaces. Screws of 1¼ inch and above are partially threaded as standard.
Drive Type
Pozidriv (PZ)
Head Style
Round Head
Finish
Black Organic Japan
Thread Type
Twin-threaded
Threading
Fully threaded up to 1 inch; partially threaded from 1¼ inch
Box Quantity
200
Available Sizes (Gauge x Length)
6 x 5/8, 6 x 3/4, 6 x 1, 8 x 5/8, 8 x 3/4, 8 x 1, 8 x 1¼, 8 x 1½, 8 x 2, 10 x 1, 10 x 1¼, 10 x 1½, 10 x 2
Box Quantity
200
Size
10 x 1, 10 x 11/2, 10 x 11/4, 10 x 2, 6 x 1, 6 x 3/4, 6 x 5/8, 8 x 1, 8 x 11/2, 8 x 11/4, 8 x 2, 8 x 3/4, 8 x 5/8
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