Product Overview
The Part That Takes the Tug So Your Connector Does Not Have To
Condition
Unused, new old stock. What the photos show is a single clamp assembly: three flat black bars stacked on a pair of threaded posts, foam pads facing each other across the two gaps, knurled thumb nuts on both posts, and black tip caps over the exposed post ends. An L-shaped bracket carries the stack, and its flat foot carries two mated thicknesses of 3M Dual Lock: a strip on the bracket with its mating half locked onto it, adhesive face turned up under a printed release liner that has not been peeled. The black finish reads even across all three bars and the white National Instruments logo screened on the top bar is crisp. The 777550-01 number is not visible in these photos; the markings that do read are the National Instruments logo on the top bar and the 3M Dual Lock printing on the fastener liner.
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Product Overview
The NI 777550-01 is National Instruments' cable strain relief clamp, the small accessory whose whole job is to catch the pull before the pull reaches the connector. Three flat bars stack on two threaded posts, foam faces meet across the two gaps between them, and the knurled thumb nuts set how hard that foam grips whatever cable is laid in; back the nuts off and the gap opens, run them down and the cable stays put. Against the ruler in the photos the clamp bar measures approximately 2-3/4 inches long, about 70 mm, and the photos show the whole assembly sitting easily inside a palm. The L-shaped bracket that carries the stack has a flat foot fitted with 3M Dual Lock reclosable fastener - a strip on the foot with its mating half locked onto it, the release liner still covering the exposed adhesive - so the clamp can be stuck to a notebook underside, a chassis wall, or a rack panel without drilling anything. It was sold as a strain relief accessory for PCMCIA, USB, and GPIB data acquisition cabling, though the jaws themselves are not keyed to any connector, so the practical question is whether your cable fits the foam-lined gap. Rated cable diameter range and post thread size are not confirmed - verify against the National Instruments documentation before use.
Key Features
- National Instruments 777550-01 cable strain relief clamp, logo screened in white on the top bar
- Three stacked flat bars forming two foam-lined cable gaps
- Two threaded posts with knurled thumb nuts that set the clamping gap and pressure
- Black tip caps fitted over the exposed end of each post
- L-shaped mounting bracket with mated 3M Dual Lock fastener strips on the foot, printed release liner still in place
- Clamp bar measures approximately 2-3/4 inches long against the ruler in the photos
- Unused, new old stock, sold as a single unit
Applications
- A test engineer running a PCMCIA or USB acquisition card in a notebook, tired of the cable's own weight slowly walking the connector out of the slot
- A lab tech wiring a GPIB rack who wants the cable bundle anchored to the panel instead of hanging its entire weight off an instrument connector
- Someone rebuilding a period National Instruments acquisition setup who would rather use the factory accessory than a zip tie and optimism
- A bench builder who needs a cable anchor on a surface nobody is allowed to drill, where a Dual Lock foot is the only mount available
Frequently Asked Questions
Is the mounting pad Velcro?
No. The strip on the mounting foot is printed 3M Dual Lock, the reclosable fastener that uses interlocking mushroom-shaped stems rather than hooks and loops. An older description of this clamp called it Velcro; the photos show the Dual Lock printing, and the part wins that argument. The photos show two mated thicknesses on the foot - a strip on the bracket with its mating half locked onto it, the printed release liner still covering the exposed adhesive - which is the mating piece the older listing counted as included.
What size cable will it hold?
The two gaps are foam-lined and their opening is set by the thumb nuts, so the usable range depends on how far you back the nuts off. A rated cable diameter range is not confirmed - verify against the National Instruments documentation before use. What the photos do establish is scale: the clamp bar measures approximately 2-3/4 inches long against the ruler, and the assembly fits inside a hand.
Does mounting it require drilling?
The foot is set up for the Dual Lock fastener, so a clean flat surface needs no holes. No mounting screw holes are visible in these photos.
Has the clamping hardware been exercised?
It has not been operated or tested here; the clamp is described as unused new old stock and is being sold on the strength of what the photos show. Both posts carry their thumb nuts and tip caps, and the fastener liner has not been peeled.
Why buy this single clamp instead of chasing a surplus lot?
There is exactly one here, photographed from several angles, and it is unused new old stock. Accessories like this usually surface buried in a crate of mixed brackets and cables bought sight unseen, where you find out what you own after it arrives. This is the other transaction: you can look at the finish, the logo, the foam, and the untouched fastener liner before you decide, and you buy the one piece you actually need. Shipping is $8 flat rate, free once your order passes $28, and orders leave our Idaho warehouse the same or next business day.
Strain relief is the least glamorous job in a test rack: nothing happens, on purpose, for years. Run the thumb nuts down, let the foam take the tug, and your connector gets to go on being boring.
