Abstract: A socket-and-plug assembly includes a socket member formed with a looped recess therein and a core that is surrounded by the looped recess and that is formed with a plurality of terminal passages. A latch member has an inserting end section inserted in the looped recess, and a resilient latch arm that is engageable with the socket member and that is resiliently pressable to disengage from the socket member. A plug member includes a terminal seat received snugly in the inserting end section, and a plurality of conductive terminals mounted in the terminal seat and received in the terminal passages, respectively.

Abstract: Disclosed is a member of nylon 12 having a relative viscosity of from 1.9 to 3.5 when measured in 98% sulfuric acid at a concentration of 10 g/dm3 and at 25° C. and a melt flow rate of 0.1 g/10 min. or more when measured at 235° C. under a load of 2,160 g, wherein said relative viscosity and said melt flow rate have a relationship of the following formula (I): 2.87×103 exp (−3.48 &eegr;r)≦MFR≦3.25×104 exp (−3.48 &eegr;r)  (I) wherein &eegr;r is relative viscosity and MFR is melt flow rate. The nylon 12 has excellent extrusion moldability and creep characteristics, fatigue characteristics and the like mechanical properties and is suited for tubular molds. A nylon 12 composition comprising the nylon 12 having the above-described specific relationship between &eegr;r and MFR and a plasticizer is also disclosed.