CREATE TABLE table_29158 ("Chambering" TEXT, "P1 diameter  ( mm ) " TEXT, "A external  ( cm 2  ) " TEXT, "P max  (  bar  ) " FLOAT, "F bolt  (  kgf  ) " FLOAT, "F bolt" TEXT)

What is the p max ( bar ) for the 6876 f bolt ( kgf )?
SELECT MIN("P max ( bar )") FROM table_29158 WHERE "F bolt ( kgf )" = '6876'
SELECT MIN("P max ( bar )") FROM "table_29158" WHERE "F bolt ( kgf )" = '6876'