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STANAG 4694
STANAG 4694 NATO accessory rail
Manufacturers of small arms sights, grips, lights and other rail-mounted accessories, and the defence buyers who specify NATO accessory-rail compatibility.
STANAG 4694 is the NATO agreement that defines the standardised NATO accessory rail for attaching sights and other equipment to small arms. NATO has not released it publicly; this page describes it from the Czech defence standard that implements it.
- Edition
- 1
- Published
- 2011-03-16
NATO has not released this STANAG publicly. It is NATO UNCLASSIFIED, and organisations that need it obtain it through their national standardization authority.
What it is
STANAG 4694 is the NATO Standardization Agreement on the NATO accessory rail. Edition 1, promulgated in March 2011 under NATO's CNAD, AC/225 NAAG, LCGDSS.
NATO has not released STANAG 4694 publicly, so this page describes it from a public national implementation, the Czech defence standard ČOS 100010 (1st edition, 2022), which states that it introduces STANAG 4694 edition 1 into Czech use, for reasons of interchangeability of accessories for hand-held small arms. A national implementation can add national requirements and reservations, so treat what follows as the Czech implementation's content, not as NATO's own text.
What the Czech implementation requires
ČOS 100010 sets out the rail as a unified interface for connecting the required accessory. It requires the rail's dimensions and tolerances to comply with ČSN ISO 2768-1, ČSN ISO 2768-2, ASME Y14.100 and ASME Y14.5M-1994, and states that the rail is fully backward compatible with existing accessories that conform to the American standard MIL-STD-1913. It recommends that an accessory, such as a sight mount, contact only three surfaces of the rail: the top surface and two lower angled surfaces.
Annex A gives the rail as a drawing, which the standard says is identical to the one in STANAG 4694 itself, so as to avoid any ambiguities. Its notes set tolerancing to the same referenced documents, state that the distance between groove centres is a multiple of 10 mm, cap the edge chamfer at 0.3 mm and the fillet radius at 0.89 mm, and give all dimensions in millimetres.
How NATO documents describe the rail
NATO's AEP-4845 cites the rail repeatedly as a mechanical interface for weapon accessories. Describing a weapon optical device's mounting adapter, it states: "This interface is a mechanical adapter to fix the device to the NATO Accessory Rail defined by STANAG 4694 or Picatinny Rail defined by MIL-STD 1913." It lists the same interface for a weapon, a fire control system, a target marking and illumination device, and a round counting device, and notes that STANAG 4740 extends the rail "to allow also power supply from a stack of secondary batteries".
AEP-2902, a NATO combat helmet standard, lists STANAG 4694 among its normative references and states that side rails on a helmet must conform to one of two standards, one of them STANAG 4694 edition 1, the NATO Accessory Rail.
How we help
A supplier bound by STANAG 4694 through a contract holds the obtained text through its national authority. In ComplyTrain you record the requirements that apply to you as your own requirements, give each an owner, and keep the evidence that shows you meet them against each one.
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