Teathered Bolt

You might want to try aviation bolts. The heads have thru-holes through which wire is run and attached to some other part - often some major structural element. The intent is to wire them up so that they can't loosen but it sounds like they might meet your needs as well. They come in many sizes I believe and you'll find them at your local airport if it has a maintenance facility.

You might try a mobile home part supplier. I've seen tethered bolts used to anchor singlewide trailers to the pier/pad foundation.

Hi Mark,
I don't have the specific info, but you may be able to handle the problem by drilling a hole through either the head or the end of the bolt and then attaching a tether through the hole.

Most bolt manufactuers make standard bolts with captive washers. NAS and MIL spec bolts come predrilled for safety wire. Small sizes, up to 1/2" or so are drilled for 0.032" safety wire. Use safety wire pliers to twist the stainless wire either as a lock or tether or both. Safety wire pliers are availabnle from any of the commercial mechanics tool suppliers or at any aircraft supply or pilot shack at most airports.

I would drill out the threads and use a farm hitch pin with a handel on it where a teather could easily be attached to the pin.

Placers like Pivot Point Fasteners (http://www.pivotpins.com/index.html) offer the short lanyards for tethering parts, and at least some of their products come with lanyards already installed. I believe that at least some auto racing series (CART?) require tethering of suspension and other parts so that they can't go into the stands after an accident on the track; suppliers of racing equipment may be able to offer what you need.

What kind of bolt are you using? If they do not have to be hex-head bolts, you might consider eyebolts, which have the shank formed into a circular loop, to which you could attach a cable. If you need the same "head" configuration to retain a washer, run up a hex-head nut first, then put on the washer.

Carr Lane Mfg. makes steel cable accessories which may be used with our own alignment pins or any other type of device to tether them. We do have some teardrop or rectangular (oval) cable tabs, but the largest screw/bolt which could be accomodated is 1/4 inch. However, we do and can produce specials if it is a large quantity which is needed (at least several hundred). We do make individual cables to order using our standard parts, including crimped ferrules to make loops on the ends, terminal lugs, and wire cable rings that fit a wide variety of external diameters and grooves. The wire ring info is included here (see below):

CABLE RINGS
Features Dimensions

FEATURES: Cable Rings attach to our nylon-coated cable. These rings allow attaching the Cable Assembly to a diameter or radial groove. Can be used with cable sizes #1, #2, and #3. Available in steel, or stainless steel as a special.

SIZES: Available to fit diameters from 1/8" (3mm) to 1-1/2" (38mm) in 16th-inch increments.

MATERIAL (STEEL): Spring steel, black oxide finish.

MATERIAL (STAINLESS): 300-series stainless.

For more info on cables and accessories visit the online catalog at:

http://www.carrlane.com/Catalog/

Then click on "Alignment Pins", then "Cable".

Hope this helps!

I really like your posting .i will keep visiting here. i will recommend another cable exporter

http://www.yamunadensons.com/

Go to www.mcmastercarr.com and search for "drilled hex head bolts". They should have what you're looking for.

There is a tethered padlock chain that I have seen but I have not found just the chain.