Specification Sheet

Designed for greater key control, the 1870HM Cylinder-
Operated Flushbolt prevents accidental locking of the
inactive leaf of paired hollow metal doors. May be installed
to lock at threshold or at header.
1870HM Cylinder-
Operated Flushbolt
Function
Designed for use instead of conventional flip-lever operated flushbolts, the 1870HM
Cylinder-Operated Flushbolt gives building management key control of the inactive
leaf of paired doors. Prevents casual locking of the inactive leaf by children or other
unauthorized persons. Uses same basic over-center action mechanism as MS
®
pivoted bolt locks. Recommended for installation at both top and bottom of inactive
door with MS1850SN Deadlock in active door for greatest security. May be installed
to lock at threshold or at header.
Operation
360° turn of key throws or retracts the hex-section bolt. Key can
be removed only when bolt is in a positively locked or unlocked
position. Accepts any standard 1-5/32" mortise cylinder from
either or both sides. Cylinder must have MS
®
dimensioned cam
(see CYLINDERS).
Specifications
CYLINDER BACKSET
• 1-1/4" only.
CYLINDER HEIGHT
• Standard length (cylinder center to door end) is 13-1/2".
Other lengths available by special order.
CASE
• Measures 7/8" x 6" x 1-21/32". Steel with corrosion-
resistant plating.
BOLT
• Hexagonal 3/8" flat to flat, with 11/16" throw. Made of
stainless steel.
STRIKE
• 2-1/4" x 15/16" strike is supplied.
FACEPLATE.
• Faceplate measures 1" x 8".
STANDARD PACKAGE
• Basic lock mechanism boxed with actuator arm attached,
rod/bolt assembly unattached. Stainless steel bolt guide,
mounting screws, and installation instructions included.
Cylinders available separately. Shipping weight: 1-1/4 lbs.
CYLINDER CAM
• 1870HM Cylinder-Operated Flushbolts are operable by
any standard 1-5/32" diameter mortise cylinder with MS®
cam dimensioned as shown. Cylinders with MS® cams
can be readily obtained from most cylinder manufacturers.
See CYLINDERS section for cylinder make, thumbturn
and trim ring information.
1870HM CYLINDER-OPERATED FLUSHBOLT
HOLLOW
METAL
B
LOCK CASE
CAM
TR
A
DOOR CENTERLINE
*TOLERANCE: ± 1/16
DOOR STILE
TRIM RING
CYLINDER
TR* = A + .125 – B TR* = A + .132 – B
FOR MS
®
LOCKS: FOR 4500 SERIES LATCHES:
“Dim A”
R
R
1830
2190
2290
MS1837
MS1850S
MS1850SN
MS1861
MS1950
1875
MS
+
1890
4300
4510
4530
4900
4781
4920AN
8300
8400
8650
DEADLOCK
DEADLATCH
SERIES
SERIES
EXIT
DEVICES
1870
1870HM
1877
3080
3090
FLUSHBOLTS
TRIM
THIS CAM AVAILABLE FROM:
ADAMS RITE
ARROW
ASSA
BEST
CORBIN RUSSWIN
DORMA
FALCON
KABA-ILCO
MEDECO
SARGENT
SCHLAGE
WEISER
YALE
.120"
3.0mm
.182"
4.6mm
.334"
8.5mm
.620"
15.7mm
R
.721"
18.3mm
.950"
24.1mm
.334"
8.5mm
.800" ± .005"
20.3mm ± .127mm
.850" ± .005"
21.6mm ± .127mm
THIS CAM AVAILABLE
FROM ABOVE CYLINDER
MANUFACTURERS
ON SPECIAL ORDER
(OR MAKE FROM
STANDARD CAM)
THIS CAM AVAILABLE
FROM ALL CYLINDER
MANUFACTURERS
(STANDARD CAM)
Narrow stile doors require a trim ring to fill the gap remaining between the cylinder
shoulder and stile when a standard mortise cylinder is used. If the security of the
hardened steel Adams Rite MS4043 Cylinder Guard is not required, this ring may be
simply a length of 1.171 I.D. tubing. Its length varies depending on door thickness or
cylinder make and number of pins. The specific length required can be quickly
determined by the following formula:
DIMENSIONS OF CAM TO OPERATE:
DIMENSIONS OF CAM
TO OPERATE:
4070 SERIES DEADBOLT
DIMENSIONS OF CAM
TO OPERATE:
2331 DEADBOLT
CYLINDER TRIM RING FOR NARROW STILES
“ TR ” is trim ring length.
“
A ” is cylinder height (less shoulder but including cam).
“
B ” is one-half of door thickness.
800.872.3267 • Fax [phone]
10027 S. 51st Street, Ste 102
Phoenix, Arizona 85044
www.adamsrite.com
ARM-014-9/14
FLUSHBOLTS & PIVOTS
FP-3