1800 644 434|parts@flexliner.com.au
Adjustable Feet

Threaded Tube Inserts

Rectangle Threaded Tube Inserts

Expanding inserts use the Rawlplug effect: two moulded nylon pieces with hex nuts inside tapered cavities. Tightening a bolt presses the nuts downward, expanding the outer walls to grip the tube. Expanding inserts are made with mild steel zinc plated threads as standard, also available in stainless steel 304 or 316 (marine grade); load capacity is 300kg for expanding inserts. Thread stop is the distance from the top of the insert head to the end of the female thread inside the insert.

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Showing 29 of 29 products

RLTi-5731 Rectangle Threaded Tube Inserts product image

M6 40x20x1.6mm Threaded Tube Insert (RLTi-5731)

Thread
M6
Tube size
40 x 20 mm
Wall thickness
1.6 mm
Max static load
50 kg
Housing
PA
Thread material
MSZP
Flexliner RLTi-5732 product photo

M8 40x20x1.6-2mm Threaded Tube Insert (RLTi-5732)

Thread
M8
Tube size
40 x 20 mm
Wall thickness
1.6-2 mm
Max static load
50 kg
Housing
PA
Thread material
MSZP
Flexliner RLTi-5817 product photo

M8 50x25x1-2mm Threaded Tube Insert (RLTi-5817)

Thread
M8
Tube size
50 x 25 mm
Wall thickness
1-2 mm
Max static load
75 kg
Housing
PE
Thread material
—
Flexliner RTLi-5742 product photo

M8 80x40x2mm Threaded Tube Insert (RTLi-5742)

Thread
M8
Tube size
80 x 40 mm
Wall thickness
2 mm
Max static load
100 kg
Housing
PA
Thread material
MSZP
Flexliner RETi-5797 product photo

M10 50x30x2mm Threaded Tube Insert (RETi-5797)

Thread
M10
Tube size
50 x 30 mm
Wall thickness
2 mm
Max static load
300 kg
Housing
PA
Thread material
MSZP
Flexliner RETi-5819 product photo

M10 50x25x2mm Threaded Tube Insert (RETi-5819)

Thread
M10
Tube size
50 x 25 mm
Wall thickness
2 mm
Max static load
300 kg
Housing
PA
Thread material
MSZP
RETi-5862 Rectangle Threaded Tube Inserts product image

M10 50x25x1.2-1.6mm Threaded Tube Insert (RETi-5862)

Thread
M10
Tube size
50 x 25 mm
Wall thickness
1.2-1.6 mm
Max static load
300 kg
Housing
PA
Thread material
MSZP
Flexliner RLTi-5815 product photo

M10 50x25x1-2mm Threaded Tube Insert (RLTi-5815)

Thread
M10
Tube size
50 x 25 mm
Wall thickness
1-2 mm
Max static load
75 kg
Housing
PA
Thread material
MSZP
Flexliner RLTi-5815LG product photo

M10 50x25x1-2mm Threaded Tube Insert (RLTi-5815LG)

Thread
M10
Tube size
50 x 25 mm
Wall thickness
1-2 mm
Max static load
75 kg
Housing
PA
Thread material
MSZP
RTLi-5816 Rectangle Threaded Tube Inserts product image

M10 50x30x1-2mm Threaded Tube Insert (RTLi-5816)

Thread
M10
Tube size
50 x 30 mm
Wall thickness
1-2 mm
Max static load
300 kg
Housing
PA
Thread material
MSZP
RTZi-5763 Rectangle Threaded Tube Inserts product image

M10 50x30x2mm Threaded Tube Insert (RTZi-5763)

Thread
M10
Tube size
50 x 30 mm
Wall thickness
2 mm
Max static load
600 kg
Housing
ZDC
Thread material
—
Flexliner RTZi-5889 product photo

M10 50x25x2mm Threaded Tube Insert (RTZi-5889)

Thread
M10
Tube size
50 x 25 mm
Wall thickness
2 mm
Max static load
800 kg
Housing
ZDC
Thread material
—
RETi-5737 Rectangle Threaded Tube Inserts product image

M10 60x30x2mm Threaded Tube Insert (RETi-5737)

Thread
M10
Tube size
60 x 30 mm
Wall thickness
2 mm
Max static load
300 kg
Housing
PA
Thread material
MSZP
RTLi-5733 Rectangle Threaded Tube Inserts product image

M10 60x30x1.6-2mm Threaded Tube Insert (RTLi-5733)

Thread
M10
Tube size
60 x 30 mm
Wall thickness
1.6-2 mm
Max static load
250 kg
Housing
PA
Thread material
MSZP
RTLi-5741 Rectangle Threaded Tube Inserts product image

M10 60x40x1.6-2mm Threaded Tube Insert (RTLi-5741)

Thread
M10
Tube size
60 x 40 mm
Wall thickness
1.6-2 mm
Max static load
100 kg
Housing
PA
Thread material
MSZP
RTZi-5736 Rectangle Threaded Tube Inserts product image

M10 60x30x2mm Threaded Tube Insert (RTZi-5736)

Thread
M10
Tube size
60 x 30 mm
Wall thickness
2 mm
Max static load
800 kg
Housing
ZDC
Thread material
—
RETi-5743 Rectangle Threaded Tube Inserts product image

M12 50x25x2mm Threaded Tube Insert (RETi-5743)

Thread
M12
Tube size
50 x 25 mm
Wall thickness
2 mm
Max static load
300 kg
Housing
PA
Thread material
MSZP
RETi-5780 Rectangle Threaded Tube Inserts product image

M12 50x25x1.2-1.6mm Threaded Tube Insert (RETi-5780)

Thread
M12
Tube size
50 x 25 mm
Wall thickness
1.2-1.6 mm
Max static load
300 kg
Housing
PA
Thread material
MSZP
RLTi-5762 Rectangle Threaded Tube Inserts product image

M12 50x25x1-2mm Threaded Tube Insert (RLTi-5762)

Thread
M12
Tube size
50 x 25 mm
Wall thickness
1-2 mm
Max static load
75 kg
Housing
PA
Thread material
MSZP
RLTi-5762LG Rectangle Threaded Tube Inserts product image

M12 50x25x1-2mm Threaded Tube Insert (RLTi-5762LG)

Thread
M12
Tube size
50 x 25 mm
Wall thickness
1-2 mm
Max static load
75 kg
Housing
PA
Thread material
MSZP
RLTi-5764 Rectangle Threaded Tube Inserts product image

M12 50x30x1-2mm Threaded Tube Insert (RLTi-5764)

Thread
M12
Tube size
50 x 30 mm
Wall thickness
1-2 mm
Max static load
300 kg
Housing
PA
Thread material
MSZP
RTLi-5734 Rectangle Threaded Tube Inserts product image

M12 60x30x1.6-2mm Threaded Tube Insert (RTLi-5734)

Thread
M12
Tube size
60 x 30 mm
Wall thickness
1.6-2 mm
Max static load
300 kg
Housing
PA
Thread material
MSZP
RTLi-5738 Rectangle Threaded Tube Inserts product image

M12 60x30x2mm Threaded Tube Insert (RTLi-5738)

Thread
M12
Tube size
60 x 30 mm
Wall thickness
2 mm
Max static load
300 kg
Housing
PA
Thread material
MSZP
RTLi-5744 Rectangle Threaded Tube Inserts product image

M12 60x40x1.6-2mm Threaded Tube Insert (RTLi-5744)

Thread
M12
Tube size
60 x 40 mm
Wall thickness
1.6-2 mm
Max static load
100 kg
Housing
PA
Thread material
MSZP
Flexliner RTLi-5848 product photo

M16 50x25x1.6-2mm Threaded Tube Insert (RTLi-5848)

Thread
M16
Tube size
50 x 25 mm
Wall thickness
1.6-2 mm
Max static load
100 kg
Housing
PA
Thread material
PA
RTHi-5745 Rectangle Threaded Tube Inserts product image

M16 80x40x2mm Threaded Tube Insert (RTHi-5745)

Thread
M16
Tube size
80 x 40 mm
Wall thickness
2 mm
Max static load
900 kg
Housing
PA
Thread material
BrassNP
Flexliner RTHi-5746 product photo

M16 100x50x2mm Threaded Tube Insert (RTHi-5746)

Thread
M16
Tube size
100 x 50 mm
Wall thickness
2 mm
Max static load
900 kg
Housing
PA
Thread material
BrassNP
RTHi-5747 Rectangle Threaded Tube Inserts product image

M16 100x50x3mm Threaded Tube Insert (RTHi-5747)

Thread
M16
Tube size
100 x 50 mm
Wall thickness
3 mm
Max static load
900 kg
Housing
PA
Thread material
BrassNP
Flexliner RTHi-5749 product photo

M16 150x50x3mm Threaded Tube Insert (RTHi-5749)

Thread
M16
Tube size
150 x 50 mm
Wall thickness
3 mm
Max static load
900 kg
Housing
PA
Thread material
BrassNP

How to choose Rectangle Threaded Tube Inserts

29 products
  • Compare thread sizes, tube sizes, load ratings before requesting pricing.
  • Use the range and related product links to move between close alternatives without relying on filter-only URLs.
  • Send Flexliner the part number and quantity when the shortlist is ready for quote confirmation.

Applications and Quote Prep

  • Rectangle Threaded Tube Inserts are used where buyers need repeatable support, levelling, tube finishing, or machine setup from a known part number.
  • The visible product table supports quoting by keeping commercial identifiers and selection specs on the page.

Related Ranges

Square Threaded Tube Inserts

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Square threaded tube inserts for 50 - 750kg max load.

Round Threaded Tube Inserts

95 products

Round threaded tube inserts for 100 - 300kg max load.

Heavy Duty Square Threaded Tube Inserts

60 products

Heavy duty square threaded tube inserts for 350 - 1,000kg max load.

Heavy Duty Round Threaded Tube Inserts

15 products

Heavy duty round threaded tube inserts for 350 - 900kg max load.