T-Nut and Bolt Set Aluminium Profile Fastener Kit M5 M6 M8 20-40 mm T-Slot Hardware

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

Matched T-nut, bolt and washer set for aluminium profile frames in M5, M6 and M8. Assorted for prototypes or packed by size, by member or by joint for production builds.

Wholesale Price $0.06 - $0.19 / set per set

Material	Steel
Alloy Grade	Zinc-plated steel / stainless steel
Temper	custom
Section Size	Suits 20 / 30 / 40 series grooves
Slot	M5 (20 series) / M6 (30 series) / M8 (40 series)
Length	Bolt lengths 8 / 10 / 12 / 16 / 20 mm
Tolerance	DIN 934 thread class 6H nut, 6g bolt
Surface	Zinc plated / stainless
MOQ	5000
Lead Time	12-20 days after deposit
Loading Port	Shanghai / Ningbo
Supply Ability	3,000,000 sets 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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Fastening · Nut and bolt set

A T-nut and bolt set is a matched kit of the parts one frame consumes: T-slot nuts, bolts and washers in the sizes the frame uses. The nut drops into the groove, the bolt passes through the component and into the nut, and tightening pulls the nut against the groove lips so the joint locks. Supplied as a set, the three parts are already known to fit each other, which is not always true when they are bought separately.

The reason to buy a set rather than loose boxes is the way frame projects fail. They rarely fail because a fastener is too weak. They fail because the assembler reaches for a nut that is one series out, or because the count came up short on the last bay and the frame sits unfinished while a small order is placed. Both are avoided by sizing the kit from the joint count on the drawing instead of from the length of profile ordered.

T-nut and bolt set: the nut sits in the groove, the bolt passes through the component and pulls the nut against the groove lips.

Fastener count is a joint count, not a length

The most common way to size a fastener order is to take the total metres of profile and multiply by a number that felt right last time. It is quick and it is wrong, because fastener count is set by how many times two members meet, not by how long they are. Two frames with the same total profile length can need very different numbers of fasteners depending on whether they are a dense grid or a few long spans.

The reliable method is to walk the drawing and count joints. Every place where two members meet at a corner or a T needs its own fasteners, and every place where a panel, foot, caster or hinge lands on a member needs more. That joint count, multiplied by the fasteners per joint, is the number to order against.

Frame	Profile used	Joints	Fasteners at 2 per joint	Fasteners at 4 per joint
Guard enclosure, 1,200 x 800 x 600 mm	14 m	16	32	64
Workbench, 1,500 x 750 x 900 mm	11 m	14	28	56
Trolley, 800 x 500 x 1,000 mm	9 m	12	24	48
Machine base, 2,000 x 1,000 mm	19 m	22	44	88
Display frame, 2,400 x 2,000 mm	24 m	20	40	80

Counting joints from the drawing

Mark every intersection first Go over the drawing and put a dot on every place two members meet. Corners, Ts and crosses all count. Do this before thinking about fasteners, so the count is not coloured by how the frame will be assembled.
Classify each intersection by how many faces are loaded A simple corner carries load in one plane and usually takes two fasteners. A corner that also carries a panel or a caster takes four or more. Write the number next to each dot rather than trying to keep it in your head.
Add the non-structural fixings Panels, infill, feet, casters, hinges, handles and cable clips each add fasteners that do not appear as frame joints. These are the items most often left out of a first count, and they are usually a third of the total.
Apply the allowance and round up to the pack size Add 15 per cent, then round up to the next full pack. The allowance covers dropped parts, a stripped nut, a late change on site and the spare that should be left in each member.

Why the allowance is 15 per cent

A frame is assembled by hand, and hand assembly loses parts. Nuts are dropped into machine bases and never recovered, bolts are started into the wrong hole and cross-threaded, and washers go missing between the box and the joint. None of that is unusual and none of it is predictable joint by joint.

Fifteen per cent covers the ordinary losses on a frame of a few dozen joints, and it is cheap next to the alternative. The cost of one extra box of nuts is trivial against a stopped assembly line waiting for a delivery of a part that costs a few cents. On a first build of a new design, allow 20 per cent, because a new design always finds a joint that was not on the drawing.

Small frame, under 20 joints15 per cent allowance. Ordering one extra pack covers it, and the leftover goes into the spares bin rather than being wasted.

Medium frame, 20 to 60 joints15 per cent allowance, plus a labelled spares bag of 20 nuts and 20 bolts per series used. This is the size where a single missing size stops the whole build.

Large frame or first build20 per cent allowance, and split the order by member rather than by frame so that the fasteners for each sub-assembly arrive together.

Repeat buildsSet the kit once from the first build and record what was actually consumed. That record, not the drawing, becomes the order quantity for every build after it.

Bulk box or pre-sorted kit

Option	What arrives	Best for	Watch out for
Bulk box by size	One size per box, counted	Repeat builds with a known consumption	Assembly time lost sorting on site
Assorted kit	Mixed sizes in one pack	Prototypes and one-off frames	The size you need runs out first
Per-member kit	Fasteners bagged per member	Large frames and sub-assembly work	Needs the drawing split before ordering
Per-joint kit	Fasteners bagged per joint	Training builds and high-mix production	Highest packing cost per piece

Series matters more than thread size. An M8 nut for a 40 series groove will not fit a 30 series groove even though the thread is the same. Always specify the series as well as the thread when ordering a kit, because a box of the right thread in the wrong series is a box of scrap.

Frequently asked questions

How many fasteners do I need for a frame?

Count the joints on the drawing, multiply by the fasteners per joint, add the non-structural fixings, then add 15 per cent and round up to the pack size. A typical guard enclosure of about 14 m of profile has 16 joints and needs 32 to 64 fasteners depending on how many are loaded.

Why not just order by the metre of profile?

Because fastener count depends on how often members meet, not on how long they are. Two frames of the same profile length can differ by a factor of two in fastener count depending on whether they are a dense grid or a few long spans.

What is in a T-nut and bolt set?

T-slot nuts, the matching bolts and plain washers. Kits can be assorted across sizes for one-off work, or packed by size, by member or by joint for production builds. Tell us which and we will pack to it.

Can I mix M5, M6 and M8 in one kit?

Yes, and for a prototype that is usually the right choice. For a production build it is not, because mixed sizes mean the assembler has to check every part before fitting it, and that is where the wrong-size error comes from.

Do you supply stainless steel fasteners?

Yes. Zinc-plated steel is standard and stainless steel is available for outdoor, washdown and food area frames. Specify it at enquiry, because stainless affects both the price and the lead time.

Send the frame drawing and we will size the kit

Send the drawing or a bill of materials and we will count the joints, size the kit with the right allowance, quote the bulk price and supply a sample kit for a trial build.

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