UFC 4-151-10
10 September 2001
CHAPTER 4
HARDWARE AND FITTINGS (PERMANENT INSTALLATION)
4-1
SALTWATER--IN OR BELOW SPLASH ZONE. NAVFAC standard
drawings for mooring fittings are available at the NAVFAC Engineering Innovation and
Criteria web page http://criteria.navfac.navy.mil/criteria.
4-1.1
Minimum Diameter of Bolts. Use bolt with minimum diameter of 25 mm
(1 in).
4-1.2
Minimum Thickness of Metal in Straps and Fittings. Use metal with
minimum thickness of 12.7 mm (1/2 in).
4-1.3
Coatings. Typically, mooring fittings are cast and painted.
4-1.4
Washers. Provide ogee washers for all bolts used in timber construction.
Provide bolts used in concrete or steel structures with plate or standard circular washers
with no more than two at any location. Fit inclined bolts or bolted surfaces with beveled
washers.
4-1.5
Size of Bolt Holes. Drill all bolt holes in timber (other than holes for drift
bolts) with a bit having a diameter 1.6 mm (1/16 in) larger than the diameter of the bolt
shank. Align bolt-holes to allow insertion by tapping with a mallet. Do not drive or force-fit
bolts. Drill holes for drift bolts 3.17 mm (1/8 in) less in diameter than the bolt diameter.
Keep all drill bits sharp and control feed rate to produce shavings, rather than chips.
4-1.6
Locking of Bolts. Tack-weld nuts or damage the bolt threads outboard of
the nut to lock all bolted connections.
4-2
SALTWATER--ABOVE SPLASH ZONE. Use same requirements as for
installations in or below splash zone except as modified below:
Minimum bolt diameter may be reduced to 19 mm (3/4 in).
10 mm (3/8 in) minimum thickness metal in straps and fittings.
6 mm (1/4 in) minimum thickness plate washers.
4-3
FRESHWATER. Requirements are the same for installation in saltwater, in
or below splash zone, except as modified below:
15.87 mm (5/8 in) minimum diameter bolts.
4-1
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