Die Cast Bracket for 20 to 50 mm Series Aluminium Profiles Corner

OEM / ODM Available Free Sample Available RoHS and REACH declarations

Die cast zinc alloy corner bracket for 20, 30, 40, 45 and 50 series aluminium profiles, with M5, M6 and M8 fixings. A one-piece corner gusset stronger than a cut angle.

Wholesale Price Quoted per piece against series and quantity per per piece

Material	Zinc alloy
Alloy Grade	Die cast zinc alloy
Temper	custom
Section Size	20 / 30 / 40 / 45 / 50 series
Slot	M5 (20 series) / M6 (30 series) / M8 (40, 45, 50 series)
Length	One-piece bracket, no cutting required
Tolerance	Cast tolerance per series
Surface	Bright / black painted
MOQ	Sold in small packs; larger quantities quoted per piece
Lead Time	Stocked by series; larger quantities 2 to 3 weeks
Loading Port	Shanghai, Ningbo, Qingdao
Supply Ability	Die casting and finishing capacity for production volumes
Payment Terms	T/T 30 per cent deposit, balance against copy of bill of lading
Trade Terms	FOB, CIF, CFR, EXW
Certifications	RoHS and REACH declarations

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01What is a die cast corner bracket?

What does die cast mean?

The bracket is cast in a steel die from molten zinc alloy, so it comes out as a single finished shape with the holes and the gusset rib already formed. There is no cutting or machining, which keeps the piece cost low and the shape consistent from bracket to bracket.

Why is it stronger than a cut angle?

Because the die can form a web or rib across the inside of the corner, which a simple cut angle does not have. The rib puts material where the bending moment is highest, so a die cast bracket is roughly 30 per cent stronger than a flat angle of the same footprint, at the cost of being slightly heavier and bulkier.

Which series does it fit?

The full range from 20 to 50 series, with the fixing size matched to the series: M5 for the 20 series, M6 for the 30 series, and M8 for the 40, 45 and 50 series. One bracket design per series, so you buy the one that matches your profile.

02Bracket data by series

Series	Fixing	Bracket size	Typical use
20 series	M5	small	instrument frames, light guards
30 series	M6	small-medium	light machine frames
40 series	M8	medium	standard machine frames
45 series	M8	medium-large	heavy frames and gantries
50 series	M8	large	large frames and load paths

The bracket size rises with the series, because the profile section grows and the corner moment it must carry grows with it. Always match the bracket to the series of the profile.

03Die cast bracket vs cut angle

For a corner joint, you have two main options: a cut angle (flat L-section bolted on) or a die cast bracket (formed with a rib). The choice is strength and speed versus flexibility.

Factor	Die cast bracket	Cut angle
Strength	approx. 30% higher	reference
Weight	slightly higher	lower
Fit speed	fast, self-aligning holes	slower, holes to drill
Customisability	fixed shape	fully customisable
Appearance	bulkier, has a rib	flatter, lower profile
Cost	low at volume	low for one-off

If you are building many identical frames, the die cast bracket wins on speed and consistency. If you need a specific hole pattern or a low-profile joint, the cut angle wins on flexibility.

04Fitting and alignment

The die cast bracket bolts into the slot of the two adjoining profiles. The slot nuts sit inside the groove, and the bracket’s holes line up with them. The bracket is self-aligning because the hole positions are fixed by the die, so the two profiles pull square as the bolts are tightened.

Slot nuts first: slide the slot nuts into both profiles before offering the bracket up.
Tighten evenly: snug both bolts, then torque them alternately so the corner pulls square.
Match the fixing: use the correct nut size for the series, or the bracket will not seat properly.

Because the bracket is a one-piece cast, the two holes are always at the correct angle to each other, which is what keeps the frame square without shimming.

05Choosing the right corner connection

Choose a die cast bracket

You are building many identical frames
Speed and consistency matter more than a custom hole pattern
The corner carries a medium moment and needs the rib
You want a self-aligning joint that pulls square
The bracket’s bulk is acceptable for the application

Choose a cut angle

You need a custom hole pattern or edge distance
The joint must be low profile
The quantity is low and a fixed shape is not worth tooling
Weight per corner matters
You need a longer brace, not just a corner gusset

06Failure modes to design out

What goes wrong	Why it happens	Design it out by
Bracket cracks at the rib	the joint is overloaded or over-tightened	match the bracket to the series, and torque to the slot nut limit
Profiles do not pull square	the bolts are tightened one at a time	tighten alternately and evenly
Wrong fixing size	an M8 bracket used on a 30 series profile	match the bracket to the series: M5/M6/M8
Bracket loosens under vibration	zinc alloy relaxes under a plain joint	use a spring washer or thread locker, and retorque
Corrosion at the zinc-to-aluminium contact	dissimilar metals in a wet environment	use an isolating washer or a painted bracket for outdoor use

07What to check before you order

Procurement checklist for die cast brackets

Confirm the series of your profile: 20, 30, 40, 45 or 50.
Confirm the fixing size: M5, M6 or M8, matched to the series.
Confirm the quantity of corners and whether you need slot nuts and bolts too.
Confirm the finish: bright or black painted.
Confirm the environment: for outdoor or wet use, specify a painted or isolated bracket.
Confirm the load: for a heavy corner, the die cast bracket may need a second bracket or a gusset plate.

08Terms used on this page

Die cast: A part cast under pressure in a steel die, giving a consistent finished shape with the holes and ribs formed.
Zinc alloy: The casting material, chosen for its low melting point and good dimensional accuracy.
Gusset rib: A web cast across the inside of the bracket that puts material where the bending moment is highest.
Slot nut: A nut that slides into the T-slot groove and receives the bracket bolt.
Series: The profile size family (20, 30, 40, 45, 50) that sets the slot and fixing size.

09Questions buyers ask

Which series does the bracket fit?

All five: 20, 30, 40, 45 and 50 series, with a bracket per series. The fixing is M5 for 20 series, M6 for 30 series, and M8 for 40, 45 and 50 series.

Is it stronger than a cut angle?

Roughly 30 per cent stronger for the same footprint, because the cast rib puts material where the corner moment is highest.

Does it need drilling?

No. The holes are formed in the die, so the bracket is ready to bolt straight into the slot with a slot nut.

Is it weatherproof?

Bright zinc alloy is fine indoors. For outdoor or wet use, specify a painted bracket and an isolating washer to prevent galvanic corrosion.

What is the minimum order quantity?

Brackets are stocked by series and sold in small packs. Larger quantities are quoted at a lower per-piece price.

Can I get a sample?

Yes. A sample pack across the series is available so you can confirm the fit before a full order.

What we need to quote die cast brackets

The series of your profile and the fixing size.
The quantity of corners, and whether slot nuts and bolts are needed.
The finish: bright or black painted.
The environment (indoor, outdoor or wet).
Any customisation: a specific hole pattern or a painted colour.
The delivery requirement and any certification.

Send those six items and the quotation comes back with the bracket, fastener and finish broken out separately. Browse the full aluminium profile catalogue and the connecting elements range.