Introduction to Bi-Fix

Functional Characteristics

The Bi-Fix Quarter Turn Fastener is used for securing panels and components where accessibility is important. The special characteristic of the Bi-Fix Quarter Turn Fastener is its quick and simple closure. A 90º turn of the stud unlocks the connection (Fig 2), finger pressure onto the head of the stud re-clicks the fastener into the locked position (Fig 1). The Bi-Fix Quarter Turn Fastener can be used wherever two elements have to be fastened and detached in a quick and safe manner. Bi-Fix is ideal for any application where panels, doors or hatches are continually opened or removed for maintenance or security. Manufactured from quality materials, they are robust and easy to operate.

The Bi-Fix Quarter Turn Fastener consists of 3 parts:
  1. The Stud, which is located in the loose panel.
  2. The Washer, which is used for retention of the stud and vibration resistance.
  3. The Spring Clip, which is installed permanently into the shell framework, and is designed to ensure that the stud is ejected automatically when turned 90º.

The Bi-Fix Quarter Turn Fastener is manufactured in 3 size series, 8mm, 11mm or 16mm.

The Washer

Essentially, the stud is held captive in the loose panel by a washer, the function of which is to seal the hole of the fixed part and to avoid vibration. For each size series there are different thicknesses of washers available. They consist of Neoprene and they can be used in a temperature range of -40 ºC to +90 ºC. Neoprene is also resistant against UV rays and most industrial fats and oils.

Determining Washer Thickness

To determine thickness of the washer required (dimension T), add thickness of the fixed part (dimension B) to the free space between panels (dimension C), and then add 25%. Choose standard washer nearest to this dimension. Thickness of the washer T = (B + C) x 1.25. Please note that the thickness of the washer includes the free space. As shown in the drawing, the assembly is solidly fixed and resists vibration and lateral movement.

Retaining for applications exceeding 90 ºC

When Bi-Fix is to be used at temperatures exceeding 90ºC, a conical wire spring can be used instead of the washer.

The Stud

   

The grip length (P Dimension) is critical and is always measured from the underside of the head of the stud to the top surface of the clip. This includes bracketry.

The "P" Dimension - Determining Total Panel Thickness

To determine the correct stud length, the "P" dimension has to be chosen according to the following example

P = A + B + C

8mm Quarter Turn Dome Head Studs

Easily to apply these Dome Head Quarter Turn Studs just insert through the lid or top panel and then are pressed into the clip on the bottom panel to close. They can be easily released by a quarter turn with either a coin or flat blade screwdriver.

Nominal Load = 80N
Maximum Load = 300N

Material - Brass.

More details

8mm Quarter Turn Wing Head Studs

These Wing Head Quarter Turn Studs are inserted through the lid or top panel and simply pressed into the clip on the bottom panel to close. The wing head makes them easy to release by hand with a simple quarter turn of the stud.

Nominal Load = 80N
Maximum Load = 300N

Material - Brass.

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8mm Quarter Turn Knurled Head Studs

These Knurled Head Quarter Turn Studs are easy to install, simply insert through the lid or top panel and press into the clip on the bottom panel to close. Easily released by a quarter turn, the knurl around the outer edge of the head enables users to open by hand. They also have a slot to open with a coin or flat blade screwdri  [....]

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8mm Quarter Turn Rivet-on Clips

These Rivet-on Clips are designed to be riveted or screwed into place on the base panel. We also offer Slide-on and Clip-in versions.

Material - Spring Steel.

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8mm Quarter Turn Slide-on Clips

These Clips are designed to simply slide onto the edge of a panel and align with a pre-drilled hole. Please see technical drawing for panel cut-out details. Slide-on Clips always have a small space between the loose and fixed panel.

Materials - Stainless Steel, Spring Steel.

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8mm Quarter Turn Clip-in Clips

These Clip-in-Clips can be front mounted by simply snapping into pre-cut 9mm square hole, which makes them ideally suited for use on rack mount units. When Clip-In Clips are used there is always a small space between the loose panel and the fixed panel.

Material - Spring Steel.

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8mm Quarter Turn Neoprene Washers

These Bi-Fix Quarter Turn Neoprene Washers are used in conjunction with our Bi-Fix Quarter Turn Studs. Retaining the Stud in the top panel, they also seal the hole of the fixed part and reduce vibration.

Temperature range: -40°C to +90°C

Material - Neoprene (EPDM).

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8mm Quarter Turn Cup Washers

These 8mm Bi-Fix Quarter Turn Cup Washers are fitted between the stud head and the panel and are designed to prevent marking or scuffing of the panel when turning the stud.

Two types are available, see below.

Materials - Brass/Nickel Plate, Nylon/Black.

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8mm Quarter Turn Retaining Springs

This stainless steel Bi-Fix Quarter Turn Retaining Spring is often used in conjunction with a Cup Washer. It is designed to sit under the head of the Stud, providing a back pressure to force the lid closed.

Material - Stainless Steel.

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11mm Quarter Turn Dome Head Studs

For panels or components that need to be easily and quickly removed for servicing or repairs, our range of dome head quarter turn fasteners are the perfect solution. Simply click together and a quarter turn to release.

Various head styles, along with clips and washers are available. Please contact our sales team for fur  [....]

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11mm Quarter Turn Wing Head Studs

These Wing Head Bi-Fix Quarter Turn Studs are inserted through the lid or top panel and simply pressed into the clip on the bottom panel to close. The wing head makes them easy to release by hand with a simple quarter turn of the stud.

Nominal Load = 300N
Max Load = 900N

Material - Brass.

More details

11mm Quarter Turn Knurled Head Studs

These Knurled Head Bi-Fix Quarter Turn Studs are inserted through the lid or top panel and simply pressed into the clip on the bottom panel to close. Easily released by a quarter turn, the knurl around the outer edge of the head enables users to open by hand. They also have a slot to open with a coin or flat blade screwdriver if  [....]

More details

11mm Quarter Turn Rivet-on Clips

These Bi-Fix Rivet-on Clips are designed to be riveted or screwed into place on the base panel. We also offer Clip-in versions.

Materials - Stainless Steel, Spring Steel.

More details

11mm Quarter Turn Tolerance Clip-in Clips

These Clip-in-Clips can be front mounted by simply snapping into pre-cut square hole, which makes them ideally suited for use on rack mount units. When Clip-In Clips are used there is always a small space between the loose panel and the fixed panel.

Material - Stainless Steel.

More details

11mm Quarter Turn Clip-In Clips

These Clip-in-Clips can be front mounted by simply snapping into pre-cut square hole, which makes them ideally suited for use on rack mount units. When Clip-In Clips are used there is always a small space between the loose panel and the fixed panel.

Material - Stainless Steel, Carbon Steel.

More details

11mm Quarter Turn Rack Mounting Clip-in Clips

When Quarter Turn Rack Mounting Clip-in Clips are used, there is always a small space between the loose panel and the fixed panel.

Material - Stainless Steel.

More details

11mm Quarter Turn Neoprene Washers

These 11mm Bi-Fix Quarter Turn Neoprene Washers are used in conjunction with our Bi-Fix Quarter Turn Studs. Retaining the Stud in the top panel, they also seal the hole of the fixed part and reduce vibration.

Temperature range: -40°C to +90°C

Material - Neoprene (EPDM).

More details

11mm Quarter Turn Cup Washers

These 11mm Bi-Fix Quarter Turn Cup Washers are fitted between the panel and the stud head. They are designed to prevent marking or scuffing of the panel when turning the stud.

Materials - Brass/Nickel Plate, Nylon/Black.

More details

11mm Quarter Turn Retaining Springs

These stainless steel Bi-Fix Quarter Turn Retaining Springs are often used in conjunction with a Cup Washer. It is designed to sit under the head of the Stud, providing a back pressure to force the lid closed.

Material - Spring Stainless Steel.

More details

16mm Quarter Turn Dome Head Studs

Easily to apply these Dome Head Quarter Turn Studs just insert through the lid or top panel and then are pressed into the clip on the bottom panel to close. They can be easily released by a quarter turn with either a coin or flat blade screwdriver.

Nominal Load = 900N
Maximum Load = 2700N

Material - Brass.

More details

16mm Quarter Turn Wing Head Studs

These Wing Head Quarter Turn Studs are inserted through the lid or top panel and simply pressed into the clip on the bottom panel to close. The wing head makes them easy to release by hand with a simple quarter turn of the stud.

Nominal Load = 900N
Maximum Load = 2700N

Material - Brass.

More details

16mm Quarter Turn Knurled Head Studs

These Knurled Head Bi-Fix Quarter Turn Studs are easy to apply, simply insert through the lid or top panel and press into the clip on the bottom panel to close. Easily released by a quarter turn, the knurl around the outer edge of the head enables users to open by hand. They also have a slot to open with a coin or flat blade scr  [....]

More details

16mm Quarter Turn Rivet-on Clips

These Bi-Fix Quarter Turn Rivet-on Clips are designed to be riveted or screwed into place on the base panel. We also offer Slide-on and Clip-in versions.

Materials - Spring Steel, Stainless Steel.

More details

16mm Quarter Turn Rack Mounting Clip-in Clips

These Bi-Fix Quarter Turn Clip-in-Clips can be front mounted by simply snapping into pre-cut square hole, which makes them ideally suited for use on rack mount units. When Clip-In Clips are used there is always a small space between the loose panel and the fixed panel.

Material - Spring Steel.

More details

16mm Quarter Turn Neoprene Washers

These 16mm Bi-Fix Quarter Turn Neoprene Washers are used in conjunction with our Bi-Fix Quarter Turn Studs. Their function is to retain the Stud in the top panel, seal the hole of the fixed part and reduce vibration.

Temperature range: -40°C to +90°C

Material - Neoprene.

More details

16mm Quarter Turn Cup Washers

These 16mm Bi-Fix Quarter Turn Cup Washers are fitted between the stud head and the panel. They prevent the marking of the panel when the stud is turned.

Two types are available, see below.

Materials - Brass/Nickel Plate, Nylon/Black.

More details

16mm Quarter Turn Retaining Springs

These stainless steel Bi-Fix Quarter Turn Retaining Springs are often used in conjunction with a Cup Washer. It is designed to sit under the head of the Stud, providing a back pressure to force the lid closed.

Material - Spring Stainless Steel.

More details