so there are 4 bolts that hold the transmission crossmember to the frame on my 82 300d. One of the bolts just spins. its not striped ..the piece that the bolts goes into nut is spinning. what are these fasteners named? i need to buy a couple.
they are like clips with nuts welded to them

Nut plate? Captive nut?

Sixto
MB-less

its like a clip that goes into the frame.then it has a captive nut on that.
hmm

Mercedes calls it a "nut retainer".

Part # 1239901291

EPC is your friend!

New they are $14 MSRP from the dealer.

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1979 300D 040 Black on Black - 1985 300D Maaco job (sadly sprayed over 199 Black Pearl Metallic) on Palamino

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thank you so much uber.

We always called them "weld nuts" (the nut is welded to the J-clip) but I don't know if that's an official term. Most hardwares will have a stock of them in the little fastener drawers though you may have to go with English threads - my hardware doesn't have 'em in metric.

Dan

The proper terminology is "extruded U nuts".

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'83 300D, 126K miles.

Bob. Or maybe "Robert" would be the "proper" name.

(Everyone's a comedian)

Dan