Mr. Levine's listing of SC law is inaccurate through ommision; the last sentence:
The provisions of this section do not apply to rifles, shotguns, dirks, slingshots, metal knuckles, or razors unless they are used with the intent to commit a crime or in furtherance of a crime.
The a search of Hilton Head Code of Laws for the words blade, knife or Concealed do not bring up anything, nor does a search of Summerville code, as indicated.
Since you may be taking side trips into Metro Charleston I will give my entire compilation. My sources were the websites that had the municipal codes on them. Itallicized boldface is my own emphasis.
South Carolina State Law:
SECTION 16-23-405. Definition of weapon; confiscation and disposition of weapons used in commission or in furtherance of crime.
(1) Except for the provisions relating to rifles and shotguns in Section 16-23-460, as used in this chapter, weapon means firearm (rifle, shotgun, pistol, or similar device that propels a projectile through the energy of an explosive), a knife with a blade over two inches long, a blackjack, a metal pipe or pole, or any other type of device or object which may be used to inflict bodily injury or death.
SECTION 16-23-460. Carrying concealed weapons; forfeiture of weapons.
Any person carrying a deadly weapon usually used for the infliction of personal injury concealed about his person is guilty of a misdemeanor, must forfeit to the county, or, if convicted in a municipal court, to the municipality the concealed weapon, and must be fined not less than two hundred dollars nor more than five hundred dollars or imprisoned not less than thirty days nor more than ninety days. Nothing herein contained may be construed to apply to (1) persons carrying concealed weapons upon their own premises or pursuant to and in compliance with Article 4 of Chapter 31 of Title 23, or (2) peace officers in the actual discharge of their duties. The provisions of this section do not apply to rifles, shotguns, dirks, slingshots, metal knuckles, or razors unless they are used with the intent to commit a crime or in furtherance of a crime.
Charleston
Sec. 21-215. Carrying concealed ice pick or knife with blade exceeding three inches in length.
It shall be unlawful for any person to carry concealed about his person any ice pick, razor, knife, dagger or stiletto, the blade of which exceeds three (3) inches in length.
North Charleston
Sec. 13-151. Not to be carried concealed on person.
It shall be unlawful for any person to carry concealed, upon his person, within the city, except on his own premises, any firearm, razor, knuckles, dirk, slingshot, or any other weapon or instrument commonly used for the infliction of personal injury; provided, that this section shall not apply to law enforcement officers in the discharge of their duties as such officers.
Mount Pleasant
§ 132.20 CONCEALED WEAPONS.
It shall be unlawful for any person to carry concealed, on his or her person, within the municipality, except on his or her own premises, any firearms, razor, knuckles, dirk, slingshot, or any other weapon or instrument commonly used for the infliction of personal injury, provided, that this section shall not apply to law enforcement officers in the discharge of their duties as such officers.
('81 Code, § 134.01) Penalty, see § 130.99
Statutory reference:
Assault with concealed weapon, see S.C. Code § 16-3-610
Hanahan
Sec. 9-2-2 Concealed weapons.
It shall be unlawful for any person to carry concealed about his person any pistol, dirk, metal knuckles, razor, ice pick, hawkbill knife or any spring or clasp knife, which has a blade more than three (3) inches in length, or other weapon usually used for the infliction of personal injuries.
Sec. 9-2-3 Carrying of weapons.
It shall be unlawful for any person to carry about the person whether concealed or not, any dirk, slingshot, metal knuckles, razor or other weapon usually used for the infliction of personal injury or injuries. This section shall not apply to peace officers while in the discharge of their duties.
Summerville: None