Collar Lock Washer

Compared with other types of anti-loosening parts, the Collar Lock Washer produced by Xiaoguo® Factory have a thinner thickness. When used, they save more space and occupy less space, making them suitable for compact structures.

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Product Description

The reason why the Collar Lock Washer can save space without sacrificing the locking effect lies in the precise separation of its thickness and outer diameter design from its function: the outer diameter is made smaller to facilitate installation in narrow spaces, while the thickness is made thicker as a physical compensation for the possible loss of locking force after reducing the outer diameter.

The main reason: A thin outer diameter does not mean a completely thin shape; rather, it is a "thick core and thin edges" configuration.

（1）Outer Diameter (OD): Smaller

Install it safely in the blind holes, at the tail of the internal hexagonal screws, or in the confined areas surrounded by other components.

（2）Thickness: Thicker

Compensate for the possible loss of spring elasticity due to the reduction in outer diameter of the Collar Lock Washer, ensure that it can support the installation surface, and guarantee that the locking force is not reduced.

Collar Lock Washer

Mon	φ18	φ20	φ22	φ2 4	φ27	φ30	φ33	φ36	φ39	φ42	φ45
d min	18.2	20.2	22.5	24.5	27.5	30.5	33.5	36.5	39.5	42.5	45.5
d max	19.04	21.04	23.34	25.5	28.5	31.5	34.7	37.7	40.7	43.7	46.7
b min	4.3	4.8	5.3	5.8	6.5	7.2	8.2	8.7	9.7	10.2	10.7
b max	4.7	5.2	5.7	6.2	7.1	7.8	8.8	9.3	10.3	10.8	11.3
h min	4.3	4.8	5.3	5.8	6.5	7.2	8.2	8.7	9.7	10.2	10.7
h max	4.7	5.2	5.7	6.2	7.1	7.8	8.8	9.3	10.3	10.8	11.3
H min	9	10	11	12	13.6	15	17	18	20	21	22
H max	11.25	12.5	13.75	15	17	18.75	21.25	22.5	25	26.25	27.5

Typical application scenarios for space-saving

The Collar Lock Washer fastener is mainly used in situations where high-strength anti-loosening is required within confined spaces, especially when used in conjunction with socket head cap screws.

（1）Automobiles and Racing Cars

Used in highly reliable compact spaces such as engines, suspensions, powertrains, etc., while achieving weight reduction and ensuring safety.

（2）Aerospace and Military

Used in aircraft engines, cockpits and other occasions where weight and space are very limited. The Collar Lock Washer is often used in the assembly of engines, fuselages and landing gears to ensure reliability under extreme conditions. Additionally, this type of washer is also frequently used in multiple fastening applications in military vehicles, helicopters and fighter jets.

(3) Precision machinery and industrial automation

Used in tight‑space gear like precision processing equipment, industrial machines, robot joints, and automated assembly lines. Because the outer diameter is smaller, it fits easily where space is limited and handles the high alignment accuracy that precision assembly requires.

(4) Electrical and Electronics

Used inside electronic devices, connectors, panels, and similar spots. This Collar Lock Washer gives you solid locking without needing extra washers – a compact way to keep things tight under vibration.

(5) Heavy Industry and Construction

In heavy machinery, construction equipment, and structural steel work, the compact size of this washer makes it a go‑to choice for engineers who need dependable vibration resistance and anti‑loosening.

Collar Lock Washer