ALTDEV ALT OVERSHOT. DSNDING ARR TFC; A B737-400 USES INCORRECT ALTIMETER SETTING; HAS POTENTIAL CONFLICT WITH DEP TFC FROM PIT.

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DSNDING FROM ACO TO CUTTA INTXN; WE BEGAN TO DISCUSS XWIND LIMITATIONS AT PIT. ATIS WINDS WERE 240 DEGS 26 KTS GUSTING TO 41 KTS. ZOB ISSUED A CLRNC TO CROSS CUTTA INTXN AT 10000 FT. PREVIOUSLY WE HAD BEEN GIVEN A DSCNT TO 15000 FT AND I THOUGHT THE CTLR ISSUED AN ALTIMETER SETTING OF 30.62. IN REALITY THE ALTIMETER SETTING WAS 29.62. AS WE DSNDED THROUGH 18000 FT; I SET AND CALLED OUT FL180; 30.62. WE THEN DID THE PRELIMINARY CHKLIST USING THE INCORRECT ALTIMETER SETTINGS. AFTER CHKING IN WITH PIT APCH; WE ADVISED WE WOULD NOT MAKE THE XING RESTR AT CUTTA INTXN; NOT BECAUSE OF OUR ALTIMETER SETTING; BUT BECAUSE OF A LATE DSCNT CLRNC AND STRONG TAILWINDS. PIT APCH GAVE US A VECTOR TO 170 DEGS AND CLRNC TO 6000 FT. I DO NOT BELIEVE THE CTLR REISSUED AN ALTIMETER SETTING. AS WE DSNDED TO 6000 FT THE CTLR ISSUED A TA FOR A SECOND ACFT CLBING TO 5000 FT. WE DID HAVE THE SECOND ACFT VISUALLY AND ON TCASII. WE THEN RECEIVED AN RA. I INSTRUCTED THE FO TO REDUCE OUR RATE OF DSCNT (AS PER THE RA) EVEN THOUGH WE HAD HIM VISUALLY. AFTER THE TFC WENT BY AND WE LEVELED AT 6000 FT; APCH CTL INDICATED THAT OUR ALT WAS INDICATING 5000 FT -- TO CHK OUR ALT. AT THIS POINT I SAID WE WERE LEVEL AT 6000 FT BUT ASKED FOR AN ALTIMETER SETTING. WHEN HE ISSUED 29.62 I REALIZED EITHER WE WERE GIVEN THE WRONG SETTING FROM ZOB OR I FLIPPED THE NUMBERS SOMEHOW. LNDG UNEVENTFUL. ALTHOUGH WE BOTH RESET OUR ALTIMETERS DSNDING THROUGH FL180; THIS PROB MAY HAVE STARTED WITH OUR DISTR OVER THE XWIND COMPONENT CHART. ALSO; IF APCH HAD GIVEN US THE LCL ALTIMETER SETTING WHEN WE CHKED IN; THIS MIGHT HAVE BROKEN THE CHAIN OF MISINFO. SUPPLEMENTAL INFO FROM ACN 361995: FO WAS FLYING THE VISUAL APCH INTO PIT; SO THE CAPT WENT OFF THE APCH CTL FREQ TO GET THE PIT ATIS. WHEN HE RETURNED HE BRIEFED THE PIT ALTIMETER SETTING AS 30.64. IT WAS AN UNUSUAL DSCNT IN THAT WE NEVER LEVELED OFF FROM THE TIME WE DEPARTED FL310 UNTIL WE REACHED 6000 FT; AND FOUND OUT FROM PIT APCH CTL THAT WE WERE ACTUALLY CLOSER TO 5000 FT; DUE TO AN INCORRECT ALTIMETER SETTING.