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STI Clock and Bell Damage Stoppers – Wire Guards for Clocks and Sounders
STI Clock and Bell Damage Stoppers are robust wire guards engineered to protect clocks, bells, and similar devices from vandalism and accidental damage. These heavy-duty stoppers are constructed of 9-gauge coated steel or 304 stainless steel, with an octagonal, spiderweb design that absorbs impact while maintaining visibility. Available in multiple sizes to fit a wide range of instruments, each model includes mounting hardware and is backed by a three-year guarantee. Ideal for use in schools, gyms, or other controlled indoor environments.
Key Features
- Constructed of 9-gauge steel with polyester coating (stainless steel optional)
- Octagonal, web-like design for strength and visibility
- Available in 10.5", 12", 18", and 24" diameter models
- Standard color: White; Red available (STI-9631-R)
- Includes mounting clamps, anchors, and screws
- Optional tamper-resistant screw kits: KIT-82 and KIT-19038
- For indoor use only
- Three-year guarantee against breakage in normal use
| Model | Color | Max Internal Diameter | Max Internal Depth | Max Outside Width |
|---|---|---|---|---|
| STI-9631-R | Red | 10.5 in. (267mm) | 10.5 in. (267mm) | 6 in. (152mm) |
| STI-9635 | White | 12 in. (305mm) | 3.65 in. (93mm) | 14.25 in. (362mm) |
| STI-9636 | White | 18 in. (457mm) | 3.65 in. (93mm) | 20.75 in. (527mm) |
| STI-9637 | White | 24 in. (610mm) | 3.65 in. (93mm) | 26.75 in. (679mm) |
Manufacturer Resources
VIEW SPEC HERE
Product Specs
- Installation:
- Fast Mounting and Easy Maintenance Access
- Parent SKU:
- STI-CLOCK-BELL-STOPPER
- Product Line:
- STI Clock/Bell Damage Stoppers
- Tamper Resistance:
- Tamperproof Kits Available (KIT-82, KIT-19038)
- Use Environment:
- Indoor Only
- Warranty:
- Three-Year Guarantee Against Breakage
- Application:
- Protects Clocks, Bells, and Similar Devices
- Sizes Available:
- 10.5 in., 12 in., 18 in., 24 in. Diameter
- Product Group:
- Safety
- Product Subgroup:
- Protective Covers
- Product Type:
- Clock and Bell Damage Stoppers – Wire Guards for Clocks and Sounders
- Department:
- Safety
- Product Color:
- White (Standard), Red (STI-9631-R)
- Product Design:
- Octagonal Web-Like Structure
- Installation Options:
- Included (Clamps, Anchors, Screws)
- Product Material:
- 9-Gauge Polyester-Coated Steel Wire (304 Stainless Steel optional)
Safety Technology International STI-9631-R – Frequently Asked Questions
1) Will an STI clock guard fit over a 10-inch wall clock in a school gym?
A 10 inch clock fits inside the STI-9635, which takes devices up to 12 in. (305mm) diameter and 3.65 in. (93mm) deep, with an outside width of 14.25 in. (362mm) on the wall. Measure the clock's depth off the wall as well as its face diameter, since the 9635 only clears 3.65 inches. If the clock projects further than that, step up to the STI-9631-R, which allows 10.5 in. (267mm) of internal depth in a 10.5 in. (267mm) diameter.
2) Which size STI damage stopper do I need for a bell or horn that sticks out several inches from the wall?
Depth is the deciding number, not diameter. The 12, 18, and 24 inch models (STI-9635, STI-9636, STI-9637) all clear only 3.65 in. (93mm) of internal depth, so they suit flat-faced clocks and low-profile sounders. A deep bell or gong needs the STI-9631-R, which allows 10.5 in. (267mm) of depth in a 10.5 in. (267mm) diameter. Measure from the wall surface to the furthest point of the device before choosing.
3) Can STI clock and bell wire guards be mounted outside on a building exterior?
No. The STI clock and bell damage stoppers are rated for indoor use only, so they belong in gyms, corridors, locker rooms, and similar covered spaces. For an exterior wall or an unheated open structure, pick a guard rated for outdoor service instead. If the concern is a damp or washdown indoor area, order the 304 stainless steel version rather than the polyester-coated steel.
4) Do I need to buy mounting hardware separately for an STI clock guard?
No extra hardware order is needed. Each STI clock and bell damage stopper ships with mounting clamps, anchors, and screws. What you should add is the tamper-resistant screw kit if the guard is going somewhere students or the public can reach it, since the standard screws come out with a common driver. STI offers KIT-82 and KIT-19038 for that.
5) What is the difference between the coated steel and stainless steel STI damage stoppers?
Both are the same 9-gauge wire cage in the octagonal web pattern. The standard build is 9-gauge steel with a polyester coating, supplied white; the optional build is 304 stainless steel. Coated steel covers ordinary dry indoor spaces. Stainless is the one to specify for pool rooms, kitchens, locker rooms, or anywhere the guard will see moisture or frequent cleaning. Both materials are offered across the small, medium, and large sizes.
6) Can you still read the clock face through an STI wire guard?
Yes. The guard is an open octagonal web of 9-gauge wire rather than a solid or polycarbonate cover, so the clock face, the bell, and any strobe lens stay visible through it. The web pattern is what takes a thrown ball or a shoulder impact and spreads the load across the cage. Standard color is white, which disappears against most gym and corridor walls; red is available as the STI-9631-R.
7) Is there a red STI bell guard for fire alarm devices?
Red is available in one model, the STI-9631-R. It takes a device up to 10.5 in. (267mm) in diameter with 10.5 in. (267mm) of internal depth and measures 6 in. (152mm) outside width. The 12, 18, and 24 inch models are white only. If you need red at a larger size, the color is not offered there, so plan on white for the bigger openings.
8) Do I have to take the STI guard off the wall to change a clock battery or service the device?
No. The stoppers are built for fast mounting with maintenance access to the protected device, so routine service does not mean pulling the cage and its anchors out of the wall. That matters if you are standardizing across a building and your maintenance crew will be back at these clocks on a schedule.
9) What sizes do STI clock and bell damage stoppers come in?
Four diameters: 10.5, 12, 18, and 24 inches. Those are maximum internal diameters, meaning the largest device the cage will cover, not the size of the cage itself. Pair the diameter with the depth check, since the 10.5 inch model is the deep one at 10.5 in. (267mm) internal depth while the other three clear 3.65 in. (93mm).
How fast can I get the Safety Technology International STI-9631-R delivered?
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Does the Safety Technology International STI-9631-R come with a warranty?
Absolutely. The Safety Technology International STI-9631-R is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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