carriage bolt

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a roundheaded bolt for timber

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Stringers attach to two 2"x4" side rails running fore and aft, which are attached to the carriage bolts in the tops of the pontoons with double nuts to keep them from loosening and to cover the tips of the bolts to prevent injuries to the dogs' feet.
4' x B' x 3/4" BC sanded plywood 2 2' x 4' x 1/2" hardwood plywood 1 1x6 x 6' pine 1 2x4 x 8' pressure-treated lumber 1 1x2 x 4' oak 1 1-1/4" x 16" oak dowel 1 1-1/2" screws (small box) 1 3" trim head screws (small box) 1 1-1/2" 18-gauge brads (small box) 1 1/4" x 3-1/2" carriage bolts 8 1/4" nut and washer 8 Wood filler, patch or putty 1 Paint, quart 1 Polyurethane, quart 1 Cutting List (for one unit) 3/4" BC SANDED PLYWOOD KEY QTY.
The final step is to pre-drill and install quarter-inch, hot-dipped galvanized carriage bolts in their place.
The crib has about $800 worth of carriage bolts and lag screws in it.
They are often referred to by the neck as round-head, square-neck carriage bolt or oval-neck connector bolt.
Most conventional snowplow systems use a long steel backer with three sections of steel together with carbide inserts that are held together with carriage bolts.
Carriage bolts are large-diameter bolts with a rounded head used for connecting structural pieces.
Because the carriage bolts must go through the holes in both legs, make sure they are lined up before you drill holes in the second leg.
Attach the bottom 60-inch 2-by-6 crosspieces 12 inches from the bottoms of the posts with countersunk 5 1/2-inch carriage bolts, and use 7-inch carriage bolts to hold a pair of 2-by-6 crosspieoes at midlevel (42 1/2 inches above the bottom crosspieces), sandwiching the posts.
Among the choices are nails, wood screws, lag screws, carriage bolts, an array of premanufactured fasteners, and specialty connectors (Figure 7-3).
Alignment is controlled with springs and wing nuts on 1/4-inch carriage bolts.
All that is visible from the exterior are the smooth heads of four carriage bolts, which are virtually tamperproof.
Carriage bolts 1/2" diameter and hot dipped galvanized and long enough to have a minimum of two threads exposed after nut and washer are installed.