30×30 square / 30×17.5 slim mounting sizes
Content updated:
Common hole patterns & brackets. This reference compares drawing checks for two light-curtain envelope sizes — 30×30 mm square and 30×17.5 mm slim. It includes hole spacing, bracket choices, clearance rules, torque, and retrofit notes for assessing whether existing machine holes can be reused.
Quick answer: Neither a 30×30 mm nor a 30×17.5 mm housing defines a universal hole pattern, fastener torque or support spacing. Compare the complete model and bracket drawings, including optical datum, active-field endpoints, connector depth and cable bends. The dimensions below are drawing checks, not a drilling template or evidence that different brands use interchangeable mounts.
1) Envelope & hole patterns (typical)
Select the sensor function from the light-curtain product families before designing its bracket. The two envelope sizes below are comparison subjects, not standardized mounting interfaces.
30×30 mm square
| Feature | Drawing check | Notes |
|---|---|---|
| Profile size | 30 × 30 mm envelope | Confirm the selected sensor drawing and window datum |
| Rear T-slot width | Measure from exact drawing | Nut and slot compatibility are not standardized by envelope |
| End-cap holes | Confirm size, depth and permitted use | Apply the bracket-kit torque, not a generic M4 value |
| Side bracket holes | Compare coordinates and slot travel | Check screw engagement and optical centerline |
| Through-mount pitch | Use approved bracket positions | Intermediate support depends on length and vibration |
30×17.5 mm slim
| Feature | Drawing check | Notes |
|---|---|---|
| Profile size | 30 × 17.5 mm envelope | A generic comparison size; not an established DQC option |
| Rear slot | Exact drawing required | Confirm nut, thread and bracket engagement |
| End-cap holes | Confirm permitted mounting method | Do not infer torque from housing size |
| Side bracket holes | Verify hole coordinates | Use the approved support arrangement |
| Support spacing | Use the sensor and bracket manual | Verify stability under expected vibration |
ASCII quick layout
Front view (30×30) Front view (30×17.5 slim)
┌────────────────────┐ ┌────────────────────┐
│ ■ optical win │ │ ■ optical win │ (offset to A-side)
│ │ │ │
└────────────────────┘ 30 mm └────────────────────┘ 30 mm height, 17.5 mm depth
30 mm 17.5 mm
Bracket-hole coordinates, threads and optical datum: obtain the exact model drawing.
This sketch illustrates envelopes only and is not a drilling template.2) Brackets & hardware (select by stiffness and access)
A. L-bracket (universal)
- Use for side-mount to frame uprights.
- Allows adjustment only within the approved bracket and alignment limits.
- Use the approved bracket material and dimensions; verify stiffness.
B. Rear T-slot sliding set
- Fast pitch adjust along the length; minimal hole drilling.
- Add intermediate supports where required by the exact installation manual.
- Use spring nuts to lock position under vibration.
C. End-cap brackets
- Clean look; keep loads axial to avoid cap cracking.
- Do not exceed torque limits; add side support if tall.
| Hardware | Size | Torque (max) | Washer | Notes |
|---|---|---|---|---|
| Bracket screw (30×30) | Exact bracket kit | Manufacturer-specified | Specified hardware | Verify thread engagement and permitted locking method |
| Bracket screw (30×17.5) | Exact bracket kit | Manufacturer-specified | Specified hardware | Avoid distortion; housing width does not set torque |
| Slot nut | Match approved slot and thread | Bracket-kit limit | As specified | Check full seating and locking |
3) Clearance & mounting rules (don’t skip)
- Assess clearance to moving parts from the hazard and access geometry; 10 mm is not a universal safe gap. Keep the optical field clear of guards.
- Keep cables away from sharp edges and follow the specified fixed or flexing bend radius for that cable.
- For reflective floors or walls, meet the manufacturer’s clearance requirements; verify that no reflected path bypasses the test piece.
- On presses or robot cells, use approved vibration-resistant mounting and keep the emitter and receiver aligned.
- Never mount on flexible doors without a stiff sub-frame.
4) Retrofit cross-reference (hole pattern sanity)
| Legacy family | Body class | Mount style | Retrofit hint |
|---|---|---|---|
| Common 30×30 families (multi-brand) | 30×30 | Side L-bracket + rear slot | No drop-in equivalence established; compare drawings and active-field position |
| Ultra-slim families | 30×17.5 | Rear slot + anti-twist pair | Add mid-support; check offset window orientation |
| Legacy OEM with end-only caps | 30×30 | End-cap | Use an adapter plate to reuse cap holes |
Exact drawings vary by series — confirm before drilling. For recessed installations, also check the complete in-frame mounting envelope and access paths. The Omron F3SJ dimension drawings illustrate why bracket and field datums must be tied to a specific variant.
5) Installer worksheet (copy/paste)
Machine: ____________________ Area: ____________________
Chosen body: ☐ 30×30 ☐ 30×17.5 Protective height (mm): ______
Bracket set: ☐ L-bracket ☐ Rear T-slot ☐ End-cap (+side support)
Support spacing (mm): ______ Mid-support: ☐ yes ☐ no
Documented reflective clearance: ____ mm Hoods/baffles: ☐
Screw & torque: M4 __ N·m / M3 __ N·m Thread-locker: ☐
Cable exit: ☐ top ☐ bottom Bend radius OK: ☐
Photos archived (TX, RX, brackets, routing): ☐6) Common mistakes & fast fixes
| Mistake | Symptom | Fix |
|---|---|---|
| Using end-cap only on tall PH | Vibration, intermittent trips | Use the approved side/intermediate supports and recheck alignment |
| Over-torque on slim body | Bracket distortion, optical misalignment | Use the exact bracket-kit torque and approved locking hardware |
| Mount perfectly parallel to glass/steel | Possible reflected bypass or nuisance trips | Meet the specified reflective clearance and validate detection |
| No allowance for window offset (slim) | Unexpected distance loss | Orient A-side correctly; re-check ISO 13855 distance |
Practical questions
What support spacing should I use?
Use the mounting instructions for the exact sensor length and bracket kit. Housing cross-section alone does not establish a safe support interval, screw size or tightening torque; account for the machine vibration and permitted bracket positions.
Can I rely on end-cap mounting only?
Only when that arrangement is permitted for the exact device and application. Confirm the allowed bracket positions and any required intermediate supports, then check alignment after tightening and under the expected vibration.
How do I avoid reflective false trips after installation?
Maintain the manufacturer's minimum distance from reflective surfaces across the entire field and validate detection with the prescribed test piece. A generic tilt angle is not a substitute: reflected light can also cause a dangerous failure to detect.