Fed. Std. No. 143a
AUGUST 9, 1960
(W-S-506, Issue on Effect)
SUPERSEDING
Int. Fed. Std. No. 143
October 13, 1959
FEDERAL STANDARD
SPARK PLUG, HEAT RATING OF,
METHOD OF CLASSIFYING
Authority..-This standard is issued pursuant to the Federal Property and
Administrative Services Act of 1949, as amended, and its application to the pur-
chase of commodities referred to herein is mandatory on all Federal agencies.
S3. Heat rating descriptions:
S1. Purpose and scope.-The purpose of this
Federal Standard is the establishment of
Heat Rating
IMEP*
uniform heat rating descriptions for use in
Hot
Below -100
classifying spark plugs of the unshielded type.
Normal-Hot
100 - 135
The content of this standard is for use in
Normal
135 - 175
Normal-Cold
175 - 210
describing unshielded spark plugs, pro- cured,
Cold
Above -210
catalogued, stocked, or used by the
*The IMEP (Indicated Mean Effective Pressure) is
Government.
expressed in p.s.i. (pounds per square inch) using
the test procedure and engine operating conditions
as specified in the SAE (Society Automotive En-
S2. Application.- Purchases from commer-
gineers) Recommended Practices of the SAE Manual.
cial sources under Federal Specification W-
S4. Changes.- When a Federal agency
S-506 of the issue in effect on date of invi-
considers that a Federal Standard does not
tation for bids, shall be limited to items which
provide for its essential needs, written re-
have characteristics, and packaging and pack-
quest for adding to or otherwise changing
ing requirements conforming to the standard
the standard, supported by adequate justi-
items specified herein. Existing Government
fication, shall be sent to the Administration.
stocks of items with other characteristics,
This justification shall explain wherein the
and packaging and packing shall continue to
standard does not provide for essential needs.
be utilized until exhausted. In those cases
The request shall be sent in duplicate, to
where this Federal Standard eliminates sup-
the General Services Administration, Federal
ply items and the items as eliminated are
Supply Service, Standardization Division,
under contract, if the contract cannot be ne-
Washington 25, D.C. The Administration will
gotiated or amended to conform to the stand-
determine the appropriate action to be taken
ard items, the Federal Standard becomes
and will notify the agency.
mandatory at the contract expiration date.
FSC 2920
570397/60/4
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