Swage nut

A swage nut or self-clinching nut is a type of nut or threaded insert is used on sheet metal. A PEM® nut is a popular brand name by Penn Engineering & Manufacturing Corp, which is often used generically for swage nuts from any manufacturer.

It permanently anchors itself to the sheet metal by swaging the surrounding material. Generally, the swage nut is made of a hard metal such as stainless steel, which is inserted into a pre-drilled hole in a softer ductile material such as aluminum. The inserted shank has three diameters: a main shaft which fits the hole closely, a thin smaller-diameter undercut, and a larger-diameter serrated clinching ring. Forcing the clinching ring into softer material, with an arbor press or by tightening a screw through the hole, causes it to plastically deform (swage) into the annular recess in the shank. This locks the nut into the hole. The knurling on the clinching ring is not necessary for this step, but prevents the nut from rotating after installation.

X.509

In cryptography, X.509 is an ITU-T standard for a public key infrastructure (PKI) and Privilege Management Infrastructure (PMI). X.509 specifies, amongst other things, standard formats for public key certificates, certificate revocation lists, attribute certificates, and a certification path validation algorithm.

History and usage

X.509 was initially issued on July 3, 1988 and was begun in association with the X.500 standard. It assumes a strict hierarchical system of certificate authorities (CAs) for issuing the certificates. This contrasts with web of trust models, like PGP, where anyone (not just special CAs) may sign and thus attest to the validity of others' key certificates. Version 3 of X.509 includes the flexibility to support other topologies like bridges and meshes. It can be used in a peer-to-peer, OpenPGP-like web of trust, but was rarely used that way as of 2004. The X.500 system has only ever been implemented by sovereign nations for state identity information sharing treaty fulfillment purposes, and the IETF's Public-Key Infrastructure (X.509), or PKIX, working group has adapted the standard to the more flexible organization of the Internet. In fact, the term X.509 certificate usually refers to the IETF's PKIX Certificate and CRL Profile of the X.509 v3 certificate standard, as specified in RFC 5280., commonly called PKIX for Public Key Infrastructure (X.509).

PEM

PEM may stand for:

Nut

Nut, NUT, Nuts or NUTS may refer to:

Food

Places

Art, entertainment, and media

Comics

Fictional or mythical entities

Film

Music

Printed works

Television

Nut (fruit)

A nut is a fruit composed of a hard shell and a seed, which is generally edible. In a general context, however, a wide variety of dried seeds are called nuts, but in a botanical context, there is an additional requirement that the shell does not open to release the seed (indehiscent). The translation of "nut" in certain languages frequently requires paraphrases, as the word is ambiguous.

Most seeds come from fruits that naturally free themselves from the shell, unlike nuts such as hazelnuts, chestnuts, and acorns, which have hard shell walls and originate from a compound ovary. The general and original usage of the term is less restrictive, and many nuts, such as almonds, pecans, pistachios, walnuts, and Brazil nuts, are not nuts in a botanical sense. Common usage of the term often refers to any hard-walled, edible kernel as a nut.

Botanical definition

A nut in botany is a simple dry fruit with one seed (rarely two) in which the ovary wall becomes very hard (stony or woody) at maturity, and where the seed remains unattached or free within the ovary wall. Most nuts come from the pistils with inferior ovaries (see flower) and all are indehiscent (not opening at maturity). True nuts are produced, for example, by some plant families of the order Fagales.

List of Marvel Comics characters: N

N'Gabthoth

N'Gabthoth is a demon who has clashed with the Doctor Strange. He once served as an agent of Shuma-Gorath. N'Gabthoth has great magical power, and could fire bolts of mystical force from his eye.

Nameless One

The Nameless One is a two-headed demon. The Nameless One first appeared in Sub-Mariner #22 (February 1970), and was created by Roy Thomas and Marie Severin. He was the leader of the Undying Ones, and led them to conquer the Earth millennia ago. The Undying Ones ruled the Earth for ages, though eventually their powers waned and were forced to return to their own realm. The Nameless One continued to rule them when they were exiled from Earth, and during several attempts to conquer it again in modern times. Later, another demon became a successor to the previous, two-headed Nameless One as leader of the Undying Ones. This demon tried to use Wolverine to kill Doctor Strange. Wolverine, enhanced by demonic magic, slew this Nameless One and many of the Undying Ones.