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STANAG 4101
STANAG 4101 towing attachments
Designers and buyers of military vehicles, trailers and towed equipment who specify mechanical towing attachments and drawbars.
STANAG 4101 sets the geometric dimensions and placement of mechanical towing attachments on military vehicles, so towing and towed vehicles interoperate across NATO. NATO has not released it publicly; this page describes it from the Czech defence standard that implements it.
- Edition
- 3
- Published
- 2021-05-18
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 4101 is the NATO Standardization Agreement on towing attachments, edition 3, promulgated on 18 May 2021, sponsored by CNAD, AC/225 NAAG, LCGLE. It covers the publication AEP-4101(A). NATO has not released STANAG 4101 publicly, so this page describes it from a public national implementation, the Czech defence standard ČOS 251002 (2nd edition, effective from 8 November 2023), which states that it introduces STANAG 4101 edition 3 and AEP-4101(A)(1) into Czech use, replacing the standard's 1st edition. 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 covers
ČOS 251002 sets out the main geometric parameters and the method of placing mechanical coupling devices on towed combinations of Czech tactical military vehicles. Its stated aims are the safe operation of military vehicles and their towed vehicles in the field, and the mutual interchangeability of vehicles and towed vehicles used by the Czech armed forces with those used by other NATO member armies. The Czech Republic acceded to STANAG 4101 with a reservation: it applies the agreement's provisions only to selected, newly introduced military systems (vehicles), a national qualification rather than something every NATO nation applies.
The technical requirements it sets: a towed vehicle's drawbar eye intended for towing by a tactical military vehicle in the field must meet dimensions given in an annex; the towing vehicle's mechanical coupling device must accept a drawbar eye of those dimensions; and the coupling device's design and placement must allow the tow bar to deflect within angle ranges set out in further annexes, verified by the methodology of the Czech national authority for testing military vehicles under ČOS 051628 (which implements STANAG 4357). Where a towing vehicle cannot meet the deflection-angle requirements, that limitation must be recorded in the vehicle's operating manual and marked durably in the cab, within the driver's view. If a towed vehicle needs longitudinal suspension, the suspension is built into the tow bar rather than the towing vehicle's coupling device, which need not be sprung. The coupling device must let the towed vehicle's drawbar eye rotate about the towing vehicle's longitudinal axis, while the eye itself must not rotate about that axis. For the height of the coupling device and drawbar eye above the ground, ČOS 251002 applies the requirements of ISO 11406; it does not otherwise adopt that standard's other requirements.
How we help
A supplier bound by STANAG 4101 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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