MIL-DTL-81963C
(Copies of these documents are available online at https://www.astm.org or from the ASTM International,
P.O. Box C700, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.)
SAE INTERNATIONAL
SAE-AS20708
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Synchros, General Specification for
(Copies of these documents are available from SAE International, 400 Commonwealth Drive,
Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside
USA), www.sae.org.)
2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict
between the text of this document and the references cited herein, the text of this document takes
precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a
specific exemption has been obtained.
3. REQUIREMENTS
3.1 Detail requirements. Detail requirements for individual servo-components shall rank in the
following order of precedence:
a. Documents and the specification sheet that cite MIL-DTL-81963 as a direct reference.
b. The general specification for the particular class of servocomponents.
c.
This specification.
d. Referenced documents.
3.2 Qualification. When a source for a qualified product is available, servocomponents furnished under
the applicable servocomponent documents and the specification sheet that cite MIL-DTL-81963 as a
direct reference shall be products that are authorized by the qualifying activity, for listing on the applicable
3.3 First article. When a source for a qualified product is not available and first article inspection is
specified by the contracting activity, (see 6.2), a sample shall be subjected to first article inspection in
accordance with 4.7.
3.4 Parts, materials and processes.
3.4.1 Parts, materials, and processes. Whenever possible, parts and materials shall be selected from
those specified herein. If a suitable material is not listed, a material shall be used, which will permit the
servocomponent to meet all the requirements of this specification. Materials used in the construction or
packaging of servocomponents shall not produce corrosive, toxic or otherwise deleterious fumes or
vapors which could precipitate upon or attack parts or personnel. Acceptance or approval of any
constituent material shall not be construed as a guarantee of the acceptance of the finished product.
3.4.2 Housing, rotor shaft. Housing and rotor shaft material shall be corrosion resistant steel
conforming to ASTM A582/A582M, Type 416 (UNS S41600). The housing is considered to include front
and rear end bells, bearing seats, and any other structural supporting parts. The shaft shall have a
hardness conforming to ASTM E18, appropriate to the servocomponent as follows:
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