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Many professionals confuse the two versions. While both cover vibration, MIL-STD-167-1 focuses on the vibration generated by the equipment itself (emissions). In contrast, MIL-STD-167-2A governs how equipment withstands vibration coming from the ship’s environment (immunity). Specifically, Type I of MIL-STD-167-2A addresses the low-frequency, high-amplitude vibration typical of ship hulls and propulsion systems.
MIL-STD-167-2A establishes mechanical vibration standards for shipboard equipment, focusing specifically on Type III reciprocating machinery and Types IV and V longitudinal/lateral propulsion system vibrations. The 1992 standard requires rigorous testing to ensure structural integrity and compliance with endurance criteria for naval ship equipment. For a detailed technical review, refer to the document and testing requirements at Quick Search DLA ASSIST-QuickSearch Basic Search (.mil)
MIL-STD-167-2A is a United States military standard specifically covering mechanical vibration requirements for reciprocating machinery and propulsion system shafting on naval ships. While its counterpart, MIL-STD-167-1A, focuses on environmental and internally excited vibrations for general equipment, 167-2A addresses more specialized heavy machinery. Core Features of MIL-STD-167-2A
Target Equipment: Primarily covers reciprocating machinery (like diesel engines) and the propulsion system including shafting.
Vibration Types: Specifically addresses Type III (Reciprocating Machinery), Type IV (Propulsion System), and Type V (Shafting) vibrations.
Status: The original version was published on May 21, 1992, and it remains valid for use in naval acquisitions, as confirmed by its latest Notice of Validation on February 9, 2023.
Distribution: Unlike 167-1A, this document is typically marked for controlled distribution, meaning it is generally accessible only to authorized government agencies and contractors. Accessing the PDF
Because this is a Department of Defense (DoD) standard with controlled distribution, it is not always hosted on public-facing commercial sites. You can verify its status or request access via official military document repositories: mil-std-167-2a pdf
ASSIST QuickSearch: The primary official portal for searching and downloading DoD standards.
Intertek Inform: Provides metadata and purchasing options for the standard's documentation.
GlobalSpec: Offers information on the standard and related referencing documents. MIL-STD-167-2 Revision A:1992 - Intertek Inform
MIL-STD-167-2A is a United States Military Standard that establishes the requirements for mechanical vibrations in naval shipboard equipment, specifically focusing on reciprocating machinery , propulsion systems, and shafting MIL-STD-167-1A
handles general environmental and internally excited vibrations for items like computers and workstations,
deals with the heavy mechanical systems that power the vessel. Isolation Dynamics Corp. Key Specifications and Scope Target Systems
: It applies primarily to propulsion shafting, reciprocating machinery (like diesel engines), and related shipboard equipment. Vibration Types Covered
: Torsional vibration from reciprocating machinery and propulsion systems. : Longitudinal vibration in propulsion systems. : Lateral vibration in propulsion systems.
: To ensure consistency in vibration requirements during procurement and to verify that machinery can withstand the dynamic stresses encountered at sea. Current Status : As of February 2023, the standard remains and valid for use in naval acquisitions. Isolation Dynamics Corp. Core Requirements The standard provides criteria for: Internal Excitation
: Managing vibrations caused by the internal operation of the machinery itself, such as unbalanced rotating components. Torsional & Lateral Stress
: Defining acceptable stress levels within the operating speed range of propulsion systems to prevent fatigue and failure. Testing Procedures This private website maintains a large library of
: Simulating the harsh shipboard environment—including engine-induced oscillations—to ensure functional and structural integrity. Isolation Dynamics Corp. MIL-STD-167: Mechanical Vibrations of Shipboard Equipment
Q: Is MIL-STD-167-2A still active?
A: Yes, it remains an active standard for shipboard equipment vibration immunity.
Q: Can I use MIL-STD-167-2A for airborne electronics?
A: No. Aircraft vibration is higher frequency and lower displacement; use MIL-STD-810H, Method 514.8.
Q: Does the standard include random vibration testing?
A: No. MIL-STD-167-2A specifies sine wave sweep and dwell testing. Random vibration is covered elsewhere (e.g., NAVSEA specifications for submarine silencing).
Q: Where can I find the latest version of the PDF for free?
A: Visit the ASSIST Quick Search website (quicksearch.dla.mil) and enter "MIL-STD-167-2A". No login is required for unclassified standards.
This article is for informational purposes only. Always consult with a qualified naval engineering authority and the most current official DoD documentation before conducting formal qualification testing.
MIL-STD-167-2A is the Department of Defense test method standard specifically focused on the mechanical vibrations of shipboard equipment
. It establishes requirements for equipment installed on naval ships with conventional shafted propulsion systems. ASSIST-QuickSearch Basic Search (.mil) Key Objectives & Scope
The standard provides a uniform approach to evaluate how equipment performs when subjected to various types of vibrations encountered in a naval environment: Internally Excited Vibration:
Covers vibrations generated by the equipment itself, such as rotating machinery. Externally Imposed Vibration:
Addresses environmental vibrations from ship operations, including propulsion and wave action. Consistency: This article is for informational purposes only
Aims to ensure interoperability and reliability across different equipment manufacturers by providing consistent testing and acceptance criteria. Intertek Inform Critical Review Points Primary Application: It is used by the Naval Sea Systems Command (NAVSEA)
and other DoD agencies for the acquisition and testing of mission-critical shipboard hardware. Testing Types:
The standard defines specific vibration types beyond basic environmental factors, including torsional, longitudinal, and lateral vibrations associated with propulsion systems. Acceptance Criteria:
It outlines displacement limits (e.g., up to 0.030 inches) and frequency ranges (typically 5 to 1500 Hz) that equipment must survive during testing durations (often 2 hours) to be considered compliant. Complementary Standards:
While MIL-STD-167-2A focuses on vibration, it is often paired with MIL-S-901D
(high-impact shock) to ensure full survivability of shipboard equipment.
Naval Facilities Engineering and Expeditionary Warfare Center (.mil) Where to Access the PDF
You can find official versions and status updates (such as its 1992 revision date) through the DLA Quick Search Official Document Search or specialized repositories like Intertek Inform acceptance criteria
MIL-STD-167-2A is a critical Department of Defense standard regulating mechanical vibrations (Types III, IV, and V) for reciprocating machinery, propulsion systems, and shafting on naval vessels to prevent fatigue failure. Validated for acquisition as of February 2023, the standard covers both internal and external vibration sources, with technical details often subject to controlled distribution. For official documents, visit ASSIST-QuickSearch. MIL-STD-167-2A - ASSIST-QuickSearch - DLA
I cannot directly provide or link to a PDF of MIL-STD-167-2A (or any copyrighted document), as that would violate distribution policies. However, I can give you a helpful, detailed summary of the standard, its purpose, where to legally obtain the PDF, and how to use it effectively.
False. MIL-STD-810 addresses a broader range of environmental conditions (humidity, altitude, rain, etc.) but does not specifically capture the unique low-frequency, high-displacement vibration of ship hulls. The Navy requires both standards for different purposes.