Single Knuckle Stair Spindle, 12.5mm Square Hollow, 1117mm, Black Powder Coated Metal Baluster

A single knuckle metal stair spindle in 12.5mm square hollow bar, 1117mm (44in) long, powder coated black: one stepped knuckle on a straight square bar. It replaces timber spindles on an indoor staircase or landing for a modern iron look, and is cut to the rake at each end on site. The price shown is for one spindle, with a minimum order of 10.

Why choose this spindle

One stepped knuckle. The square bar stays straight and slim, with a single stepped knuckle 50mm long and 37mm wide. It is a quiet detail that still looks like ironwork rather than plain bar.

Finished in black. Powder coated at the factory, so there is no painting to do once the spindles are fitted.

Light hollow bar. 12.5mm square hollow bar, 0.457 kg each, easy to cut with a hacksaw or metal cutting blade.

1117mm long. Long enough for most domestic stairs and landings, with plain ends to cut to the rake top and bottom.

Mix and match. Use it on its own or alternate it with plain spindles from the same range for a pattern.

Where it is used

On indoor staircases and landings, as a straight swap for timber spindles between the handrail and the base rail or treads. It suits new stairs and stair makeovers in houses, flats, offices and shops. These spindles are not recommended for outdoor use.

Specifications

Part lengths are approximate. The overall length can vary by a few millimetres, which makes no difference once the ends are cut to the rake.

How many do you need?

UK building regulations require gaps of less than 100mm between spindles, so most stairs need two spindles per tread. Count the treads, double it, and add the landing length divided by about 110mm.

Is this the right spindle?

This is the slim, straight-bar version. The heavy single knuckle has the same stepped collar but the bar swells out either side of it, for a more ornate look. If you want two knuckles on each spindle, choose the double knuckle.

Fitting and care

Measure the rake of your stair, then cut each spindle so it sits between the underside of the handrail and the base rail or tread, keeping the pattern at the same height along the flight. Fix the ends with spindle shoes, a grub screw or a metal-to-wood adhesive, keeping each spindle plumb.

The powder coat is the finish. Touch up cut ends with black metal paint. Wipe clean with a damp cloth; do not use abrasive cleaners.

Frequently asked questions

Ordering and delivery

Order 10 or more online, with Express UK Delivery to your site and same-day dispatch on orders before 2pm, Monday to Friday. For a larger job, call 01744 520 110 or email sales@industrialsuppliesco.co.uk and we will confirm availability and delivery before you order.