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1. ACCESS HOUSING
For more information, call 1-800-888-4784 (4STI) or visit www.sti-usa.com
KEY features
General Information
· Protects against both vandalism
and accidental damage.
· Helps protect: push button units,
smaller-sized pull stations, keypads,
electrical outlets, volume or lighting
controls and shutdown switches.
· Helps stop ice and snow from
making keypad units difficult to
operate.
· Three year guarantee against
breakage of polycarbonate in
normal use.
Design
· Stainless steel torsion spring
maintains the cover in a closed
position (excludes STI-6528).
Construction
· Molded from super tough
polycarbonate material.
Installation
· Fast, easy installation.
· Covers come complete with
mounting hardware and gasket.
· Gasket replacement recommended
after five years.
· Typical working properties of
polycarbonate are -40° to 250°F
(-40° to 121°C).
Options
· Available in many sizes, clear or
smoke colored.
STI BOPPER Stopper®
Product Overview
Inexpensive and highly durable, these hinged covers live up to their name and can
be used in a wide range of applications. Bopper Stopper can take hard knocks in
stride while protecting digital keypads, electrical outlets, smaller-size pull stations,
biometrics, volume or lighting controls and push buttons to name just a few. The
covers and hinges are molded of super tough polycarbonate material. The devices
feature a stainless steel torsion spring to keep the cover closed (excludes STI-6528).
Bopper Stoppers come complete with installation screws and gasket.
BACKED BY A THREE YEAR GUARANTEE
As all STI protective covers, these Bopper Stoppers are backed by a three year
guarantee against breakage in normal use. They are also highly cost effective and
easy to install.
STI-6518
ADACompliant
See reverse for
details

2. Printed in U.S.A., © 1987-2009 Safety Technology International, Inc.
2306 Airport Road
Waterford, Michigan
48327, USA
Tel: 248-673-9898
Fax: 248-673-1246
Toll-free: 800-888-4784
info@sti-usa.com
www.sti-usa.com
Unit 49G Pipers Road
Park Farm Industrial Estate
Redditch, Worcestershire
B98 OHU England
Tel: 44 (0) 1527 520 999
Fax: 44 (0) 1527 501 999
www.sti-europe.com
06/09Subject to change without notice.
approvals warranty
TESTING
Bopper Stopper (STI-6518 only) has been tested and approved or
listed by:
· UL/cUL No. S2466 (Over fire alarm stations only)
· UL/cUL No. S7255 (Over misc. signaling devices)
· ADA Compliant
· CSFM Approved for use over STI fire push button - indoors only
WARRANTY
Three year guarantee against breakage of polycarbonate in
normal use.
STI Bopper Stopper®
Dimensions and Technical Information
modelS available
STI-6518 Bopper Stopper®
with spring loaded hinge - clear
STI-6520-C Bio Protector - identification reader cover, enclosed -
clear
STI-6520-S Bio Protector - identification reader cover, enclosed -
smoke color
STI-6521-C Bopper Stopper for keyless lock, open - clear
STI-6521-S Bopper Stopper for keyless lock, open - smoke color
STI-6522-C Bopper Stopper - clear
STI-6522-S Bopper Stopper - smoke color
STI-6528 Bopper Stopper - weather resistant cover for stand
alone access control
Accessories
92099 Gasket for STI-6520-S, STI-6521-S
and STI-6522-S
WALL/DOOR
COVER
#10 x 1-1/2 SCREW
A
5.41 in.
(138mm)
SECTION A-A
2.37 in.
(60mm)INSIDE OF FRAME
4.15 in.
(105mm)
5.42 in.
(138mm)
FRAME
GASKET
19018
#8-10 ANCHOR
DRILL (4) HOLES
(SEE INSTALLATION
2 AND 3 BELOW)
N:
3.55 in.
(90mm)
A
A
5.41 in.
(138mm)
SECTION A-A
2.37 in.
(60mm)
INSIDE OF FRAME
4.15 in.
(105mm)
5.42 in.
(138mm)
3.55 in.
(90mm)
A
FRONT VIEW
STI-6528
SIDE VIEW
STI-6528
B
A A
8.3 in.
(211mm)
4.18 in.
(106mm)
5.23 in.
(133mm)
6.32 in.
(161mm)
7.70 in.
(196mm)
0.870 in.(22mm)
1.77 in.(45mm)
2.38 in.(60mm)
2.99 in.
(76mm)
3.12 in.
(79mm)
3.30 in
(84mm
HATCHED SECTION REMOVED
AT FACTORY FOR STI-6521-S
TOP V
STI-6
8.3 in.
(211mm)
4.18 in.
(106mm)
5.23 in.
(133mm)
6.32 in.
(161mm)
7.70 in.
(196mm)
0.870 in.(22mm)
1.77 in.(45mm)
2.38 in.(60mm)
2.99 in.
(76mm)
3.12 in.
(79mm)
8.3 in.
(211mm)
5.5in.
(140mm)
0.870 in.(22mm)
1.77 in.(45mm)
2.99 in.
(76mm)
3.12 in.
(79mm)
3.4 in.
(86mm)
4.62in.
(117mm) 19018 ANCH
(5) PROVIDE
B
A A
2.99 in.
(76mm)
3.30 in.
(84mm)
4.18 in.
(106mm)
SIDE VIEW
STI-6522
SIDE VIEW
STI-6520
STI-6521
END VIEW
STI-6520
STI-6521
STI-6522
3.20 in.
(81mm)
3.29 in.
(83mm)
R1.96
3.75 in.
(95mm)
A
A
6.40 in.
(163mm)
0.24 in.
(6mm)
4.16 in.
(106mm)
.36 in.
(9mm)
5.03 in.
(128mm)
5.18 in.
(132mm)
5 in.
(145mm)
.92 in.
(23mm)
1.93 in.
(49mm)
2.03 in.
(52mm)
END VIEW
STI-6518
SIDE VIEW
STI-6518
FRONT VIEW
STI-6518
3.20 in.
(81mm)
3.29 in.
(83mm)
R1.96
3.75 in.
(95mm)
A
A
6.40 in.
(163mm)
0.24 in.
(6mm)
4.16 in.
(106mm)
.36 in.
(9mm)
5.03 in.
(128mm)
5.18 in.
(132mm)
5 in.
(145mm)
.92 in.
(23mm)
1.93 in.
(49mm)
2.03 in.
(52mm)