Sensor mount (bracket and adjustable holder for M12, M18 and M30 barrel sensors)
Brackets and adjustable holders for M12, M18 and M30 barrel sensors · hole size, sheet gauge, slot and tilt travel, nut torque, screw-in depth and spacing between sensors
A sensor mount holds a threaded barrel sensor, such as an inductive proximity switch or a cylindrical photoelectric sensor, at a fixed position and angle beside a conveyor, fixture or machine guard. It ranges from a stamped right-angle bracket with one hole to an adjustable holder with a column, slide and ball joint. Get three things right: the bracket hole and slots for the sensor's thread and the alignment travel you need, the nut torque the sensor housing will take, and enough clear space around the sensor face that the bracket and neighbouring sensors do not change its switching.
Mounting brackets, clamps and adjustable holders for threaded cylindrical sensors (M8 to M30 class), and the installation limits that come with fitting a sensor into them: hole size, material and gauge, slot and tilt adjustment, nut torque, screw-in depth and spacing. Proximity sensors themselves, with sensing distance on different target materials and output types, are covered on the Proximity sensor page. Rectangular sensor housings, light-curtain stands and machine-vision camera mounts are outside this page.
CNFX editorial research · Sources checked October 12, 2026 · 5 sources
Bracket hole, sheet gauge and the slot travel for aiming the sensor
Banner's bracket catalogue shows how much the choice is set by the sensor thread. Its SMB12MM for 12 mm sensors is 12-gauge stainless steel with a sensor hole of ø12.3 mm as read from the catalogue drawing, ø4.6 mm and 12.8 × 4.6 mm mounting holes on 26.0 mm centres for #8 hardware, and a curved slot that allows ±10° of lateral movement. [1]
For 18 mm sensors the same catalogue lists the SMB18A right-angle bracket in 12-gauge stainless steel with an 18 mm sensor hole, a curved slot and clearance for M4 (#8) hardware, and the SMB18Q flanged bracket with an 18 mm sensor hole; the drawings for its 18 mm brackets give sensor holes of ø18.5 mm and ø19.0 mm and mounting holes on 24.2 mm centres. The SMBAMS18RA uses 12-gauge (2.6 mm) cold-rolled steel with articulation slots for more than 90° of rotation. [1] Banner's product page for the SMB18A gives 11-gauge stainless steel, so confirm the gauge from the drawing of the bracket you receive. [2]
For 30 mm sensors Banner lists a 12-gauge stainless right-angle bracket with a ø30.7 mm hole with ø6.3 mm mounting holes on 40 mm centres, and the SMBQS30L bracket for cable-sensor models with ±12° of tilt adjustment in 14-gauge stainless steel. [1] Editorial note: the hole is cut a fraction larger than the nominal thread (12.3 mm for 12 mm, 18.5 or 19.0 mm for 18 mm) so the sensor slides through and is clamped by its two nuts; the bracket does not carry a thread itself.
Give the supplier the sensor thread (M8, M12, M18, M30) and housing length, the sensor type, the mounting surface and hole pattern, the alignment travel needed (lateral, tilt, rotation), the material (stainless or zinc-plated steel), and whether nuts and screws are included.
02
Nut torque and screw-in depth for M4 to M30 housings
di-soric warns that proximity sensors can be damaged by excessive tightening torque on their nuts and gives maximum torques by thread size; a bracket or holder that needs more clamping force than this to stop the sensor moving is the wrong mount.
The values in the table come from di-soric's mounting recommendations for its inductive sensors. It derives the screw-in lengths from the thread dimensions and tolerances of DIN 13 and says that longer threads require clearance drilling. [3] Take the torque from the datasheet of the actual sensor when it differs from these figures.
di-soric also tells installers not to route sensor cables together with higher-voltage cables or with cables to inductive loads such as contactors and valves, and to keep safety distances. [3] On an adjustable holder this means leaving a cable path that does not run along motor or valve wiring.
Thread
Maximum nut torque
Maximum screw-in length in a threaded hole
M4
0.8 Nm
5 mm
M5
1.5 Nm
5 mm
M8
4 Nm
8 mm
M12
10 Nm
8 mm
M18
25 Nm
8 mm
M30
35 Nm
16 mm
03
Clear space around the sensor face: flush and non-flush, side by side and facing
Pepperl+Fuchs explains that an inductive sensor's coil generates an alternating field that an adjacent sensor's field can disturb, so a minimum distance F is needed: twice the housing diameter for flush-mountable sensors and four times the diameter for non-flush sensors. Where that space is not available, it offers sensors with offset oscillation frequencies that can be mounted directly beside each other. [4]
di-soric's figures for side-by-side mounting are 2 × d for flush and 3 × d for non-flush mounting, and it requires at least 8 times the nominal sensing distance between the active faces of sensors mounted opposite each other. [3] Editorial calculation for M18 sensors (d = 18 mm): flush spacing 2 × 18 = 36 mm with both makers; non-flush spacing 4 × 18 = 72 mm per Pepperl+Fuchs and 3 × 18 = 54 mm per di-soric. [4][3] Because the two makers differ, design the mount for the larger figure or use the value in the datasheet of the sensor you fit.
Pepperl+Fuchs counts a sensor as switched off with certainty once the target is at least three times the rated sensing distance from the active face. [5] Editorial note: metal parts of a bracket or holder that sit in front of or around a non-flush sensor's face act as a target, which is why the mounting hole position and nut stack-up matter as much as the bracket material.
04
Send the sensor, surface and alignment needs
Paste it into your enquiry below or into an email to a maker, then replace every bracket.
Sensor: [thread size; housing length; flush or non-flush; cable or connector]
Mount type: [right-angle bracket; flanged bracket; adjustable holder or rod clamp]
Material: [stainless or zinc-plated steel; gauge]
Adjustment: [lateral slot; tilt; rotation]
Mounting surface: [hole pattern; screw size]
Layout: [distance to neighbouring sensors; facing sensors]
Quantity and hardware: [nuts; screws included]
1 company lists this product among what they make. Company figures are quoted from each
company's own website; every card states where the relationship came from.
VIOX Electric
Manufacturing site to be confirmed for the order
Lists a proximity sensor mount: a bracket for photoelectric and proximity sensors in nickel-plated steel and stainless steel, with custom sizes offered.
Explore company information and manufacturing capabilities, then discuss the scope of your project with a relevant supplier.
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Compiled and source-reviewed by the CNFX editorial team.
Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review
· Page last updated 13 October 2026
Buyer questions
How tight should the nuts on an M18 proximity sensor be?
di-soric gives a maximum of 25 Nm for M18, 10 Nm for M12 and 35 Nm for M30, and warns that excessive torque can damage the sensor; use the sensor's own datasheet value where it differs. [3]
How far apart should proximity sensors on one mount be?
Pepperl+Fuchs gives twice the housing diameter for flush sensors and four times for non-flush; di-soric gives 2 × d and 3 × d, and 8 times the sensing distance between facing sensors. [4][3]
What does a right-angle sensor bracket allow for adjustment?
Banner lists a curved slot with ±10° of lateral movement on its 12 mm bracket, articulation slots for more than 90° of rotation on its SMBAMS series and ±12° tilt on the SMBQS30L. [1]
Sources and what still needs a direct check
Sources checked 2026-10-12. Banner, di-soric and Pepperl+Fuchs are sensor makers publishing their own bracket catalogue, mounting recommendations and catalogue guidance. Where they differ, the datasheet of the sensor being installed governs.
