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Specification for Wellhead
and Tree Equipment
API SPECIFICATION 6A
TWENTY-FIRST EDITION, NOVEMBER 2018
API MONOGRAM PROGRAM EFFECTIVE DATE: NOVEMBER 2019
ERRATA 1, APRIL 2019
ERRATA 2, JUNE 2020
ERRATA 3, SEPTEMBER 2020
ERRATA 4, SEPTEMBER 2021
ADDENDUM 1, JULY 2020
(API MONOGRAM PROGRAM EFFECTIVE DATE: JANUARY 2021)
ADDENDUM 2, JUNE 2021
(API MONOGRAM PROGRAM EFFECTIVE DATE: DECEMBER 2021)
Special Notes
API publications necessarily address problems of a general nature. With respect to particular circumstances,
local, state, and federal laws and regulations should be reviewed.
Neither API nor any of APl's employees, subcontractors, consultants, committees, or other assignees make
any warranty or representation, either express or implied, with respect to the accuracy, completeness, or
usefulness of the information contained herein, or assume any liability or responsibility for any use, or the
results of such use, of any information or process disclosed in this publication. Neither API nor any of APl's
employees, subcontractors, consultants, or other assignees represent that use of this publication would not
infringe upon privately owned rights.
API publications may be used by anyone desiring to do so. Every effort has been made by the Institute to
ensure the accuracy and reliability of the data contained in them; however, the Institute makes no
representation, warranty, or guarantee in connection with this publication and hereby expressly disclaims
any liability or responsibility for loss or damage resulting from its use or for the violation of any authorities
having jurisdiction with which this publication may conflict.
API publications are published to facilitate the broad availability of proven, sound engineering and operating
practices. These publications are not intended to obviate
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