Really Right Stuff BH-40, BH-55 User Manual
1146 Farmhouse Lane, San Luis Obispo, CA 93401 USA
1‑805‑528‑6321 | 1‑888‑777‑5557
www.ReallyRightStu.com
SCREW-KNOB CLAMPS
__________________________
CLAMP ID
B2-Pro II pictured;
models vary.
Really Right Stuff screw-knob clamps are compatible with
all Really Right Stuff and Arca-style quick-release plates.
Models vary in jaw length and features. Models with nonthreaded center holes include mounting screw and hex key.
Check our website for detailed specifications on all clamps.
KEY FEATURES KEY FEATURES
Top View of B2-Pro II:
All mounting holes have
countersink. Some models
have threaded center
hole, some models are
non‑threaded.
Bullseye spirit
level for quick
leveling (not on
all models).
Relief grooves allow
greater adjustment
for plates with
safety stops.
Laser engraved scale
in 1mm increments
(not on all models).
Captive Knob is
contoured for grip and
stops at maximum
opening: cannot be
lost in the field!
Bottom View of B2-Pro:
Additional mounting
holes threaded ¼”‑20
(not on all models).
Tried & true screw knob
mechanism delivers
maximum pressure on RRS‑
style quick‑release plates.
Center hole is keyed;
some clamps have
single groove, some
have double groove.
CARE AND MAINTENANCE
Our anodized aluminum clamp delivers a lifetime of wear. However,
from time to time, we recommend placing a drop of lubricant on the
shaft to prevent the stainless steel and aluminum from binding. If you
find that your clamp is not closing as smoothly as it used to, simply
unscrew the knob to fully open the clamp, squeeze the jaws together
with your fingers, and pull back the aluminum tube to expose the
threads. Then blow out any dirt or grit, and place a drop of lubricant
on the shaft and threads.
GUARANTEE
ALL RE ALLY RIGHT STUFF BRAND PRODUCTS
ARE GUARANTEED TO THE ORIGINAL PURCHASER
TO BE FREE OF DEFECTS IN MATERIALS OR
WORKMANSHIP FOR FIVE (5) YEA RS FROM THE
DATE OF PURCHASE. PRODUCTS WILL BE REPAIRED
OR REPLACED AT OUR OPTION.
® , ™, © 1990-2016 Really Right Stuff, LLC. All rights reserved.
INSTALLING YOUR CLAMP USING YOUR CLAMP
THREADED HOLE
Spin clamp onto male threaded stud until tight. Use
bushing to convert ¼”-20 stud into ”-16 stud (purchase
and install Stud into female sockets tapped ”-16).
Semi-permanently secure clamp to the stud with non-
permanent threadlocker fluid. Stud, bushing, & single
applications of threadlocker are available on our website.
NON-THREADED HOLE
Drop clamp onto a female tapped socket (tapped either
¼”-20 or M6). Install screw from above, through the
mounting hole and into the ballhead.
ADDITIONAL MOUNTING HOLES
Some of our clamps feature additonal mounting holes for
alternate installations. The two outboard threaded holes
will accept ¼”-20 screws from below or smaller flat head
screws from above.
SIDE LOADING
Turn knob one full rotation to
open clamp for side-loading
your plate.
TOP LOADING
Turn knob 2½-3 full rotations to open clamp
wide enough for top-loading your plate. You
must top-load your plate if the plate has dual
safety stop screws.
LOCKING
Tighten knob firmly, until plate is locked
within clamp.
SPECIAL NOTE FOR B2-DUO CLAMP
Nylon thumbscrews function only to
keep lens plate/foot in place when knob
is loosened to make positioning changes.
Always tighten knob firmly to lock single
clamp jaw before shooting.
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