Aluminium Profile End Cap

Q: Do end caps fit any 30 series profile?

They fit any 30x30 profile with the same outside dimensions and wall thickness. Two suppliers can both call a section 30x30 and still differ in wall thickness, so the cap is matched on the section drawing rather than on the series name.

OEM / ODM Available Free Sample Available ISO 9001:2015 RoHS REACH

Push-fit end caps for T-slot framing profiles from 15 to 60 series, sized to the outside dimensions of the section so the cap sits flush with the anodised face.

Wholesale Price $0.08 - $0.70 / pc per pc

Material	PA6 nylon
Alloy Grade	Not applicable (polymer accessory)
Temper	custom
Section Size	15x15 to 60x120 mm profile sections
Slot	Covers the full end face including the slot mouth
Length	Cap height 6-12 mm depending on section
Tolerance	±0.25 mm on outside dimensions
Surface	Moulded, UV stabilised
MOQ	500
Lead Time	15-25 days after deposit
Loading Port	Shanghai / Ningbo
Supply Ability	500,000 pcs per month
Payment Terms	T/T 30% deposit + 70% before shipment \| L/C at sight
Trade Terms	FOB \| CIF \| EXW
Certifications	ISO 9001:2015 \| RoHS \| REACH

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Profile accessories · Frame finishing

An end cap closes the open end face of a T-slot profile. On a finished frame that single small part does three jobs at once: it removes the sharp edge left by the saw, it stops dust and swarf collecting in the slot that runs out of the end, and it makes the frame read as a designed product rather than a cut extrusion.

We hold caps for the 15, 20, 30, 40, 45, 50 and 60 series, square and rectangular, in PA6 nylon. The cap is sized to the exact outside dimensions of the section, so it sits flush with the anodised face rather than standing proud of it. Standard colours are black and grey; a colour matched to the profile anodising is available on moulded parts.

Three jobs, one part

It is worth being explicit about the three jobs, because a buyer who only thinks about appearance will specify the wrong cap.

SafetyThe cut end of an extrusion has a sharp, burred edge at hand and eye height. A cap covers it without the deburring and chamfering that a visible cut face would otherwise need.

ContaminationThe T-slot runs out of the end face. Left open, it collects dust, coolant and swarf, and that debris travels along the slot into the joints. A cap closes the slot at source.

AppearanceAn open profile end shows the section, the wall thickness and the saw mark. On workstations, display frames and retail builds the cap is what makes the frame look complete.

Matching the cap to the section

The cap is matched to the outside dimensions of the profile, not to the slot width. A 30×30 profile and a 30×60 profile take different caps even though both have an 8 mm slot, and the rectangular cap is not simply two square caps joined.

Series	Square sections	Rectangular sections	Cap type
15 / 16 series	15×15, 16×16	15×30, 16×32	Push-fit, 1 detent rib
20 series	20×20	20×40, 20×60, 20×80	Push-fit, 2 detent ribs
30 series	30×30	30×60, 30×90, 30×120	Push-fit, 2 detent ribs
40 series	40×40	40×80, 40×120	Push-fit, 2 detent ribs
45 series	45×45	45×90	Push-fit, 2 detent ribs
50 / 60 series	50×50, 60×60	60×120	Push-fit, 2 detent ribs

Why the cap is sized to the outside, not the slot

A cap that grips inside the slot is cheaper to mould but leaves a visible step: the wall of the profile stands proud of the cap on all four sides. On a frame where the end is visible, that step is the first thing a buyer notices.

Sizing to the outside dimensions means the cap covers the whole end face, including the wall. It costs slightly more material and needs a tighter moulding tolerance, but it is the difference between a part that looks specified and one that looks added.

Practical point: caps are the cheapest part on the bill of materials and the easiest to forget. On an OEM frame programme we automatically include caps on every cut member that ends open, unless the customer tells us the end is being closed by a connector or a plate.

Fitting the cap on a frame that is already assembled

Check the cut is square A cap on an out-of-square cut shows a wedge-shaped gap on one side. The members we supply are cut square to within 0.2 mm, but a site-cut end should be checked before the cap goes on.
Deburr, do not file the profile down The burr should be removed from the profile, not the cap. Filing the cap rib removes the retention it was moulded for.
Push in squarely by hand Both detent ribs should engage together. If one side needs a mallet, the cap is the wrong size for the section.
Fit caps last On an assembled frame, fit the caps after all fasteners are torqued, so a socket does not knock a fitted cap off.

Frequently asked questions

Do end caps fit any 30 series profile?

They fit any 30×30 profile with the same outside dimensions and wall thickness. Two suppliers can both call a section 30×30 and still differ in wall thickness, so the cap is matched on the section drawing rather than on the series name.

Are the caps needed if the end is covered by a bracket?

No. Where a corner bracket, joining plate or base plate closes the end face, a cap would not fit and is not required. Caps are for members that end open.

Can caps be fitted after the frame is assembled?

Yes, and that is the normal sequence. Fit them after all fasteners are torqued so a socket does not knock them off.

Do you supply caps with a hole for a cable?

That is a different part. Cable entries belong on a conduit profile cap, which is moulded with a radiused entry. See the conduit end cap range.

What is the smallest order for a custom colour?

Around 2,000 pieces for a moulded cap, which is where a separate colour run becomes economical against the moulding setup.

Order caps with the frame, not after it

Send the section list and the member cut list. We will return the cap sizes, the quantities and FOB pricing, and bag the caps with the matching members so the kit assembles without sorting.

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