DIN6797J Internal Teeth Lock Washers
DIN 6797J Internal Teeth Lock Washers are designed with a series of teeth formed along the inner circumference of the washer. When the fastener is tightened, these teeth are pressed between the fastener head and the mating surface, creating multiple points of mechanical engagement. This interlocking action increases resistance to rotational movement and helps maintain the integrity of the joint when exposed to vibration or repeated movement.
Unlike external tooth lock washers, the locking teeth of DIN 6797J remain inside the outer edge of the washer. This makes the washer suitable for assemblies where the locking action needs to be concentrated beneath the fastener head without adding teeth around the outside perimeter. The toothed design can also improve contact between the fastener and the mating surface, making it a practical choice for compact bolted and screwed connections.
Specification:
The specification of DIN 6797J Internal Teeth Lock Washers covers the washer geometry, material, hardness, and surface condition required for different fastening assemblies. The internal tooth profile, washer thickness, and contact surface are controlled during production to provide consistent engagement with the mating fastener and component. Material selection also affects the washer’s resistance to deformation and its suitability for different service environments.
Common materials include carbon spring steel and stainless steel grades such as 304 and 316. Spring steel versions can be supplied with protective finishes such as zinc plating for improved resistance to corrosion, while stainless steel versions are selected when the assembly requires higher corrosion resistance. The specification can also include hardness requirements, heat treatment, surface finish, and dimensional tolerances according to the applicable standard and customer requirements.
| Item | Specification |
|---|---|
| Standard | DIN6797J |
| Product Type | Internal Teeth Lock Washer |
| Tooth Type | Internal Teeth |
| Inner Diamter | Φ1.6-Φ30 |
| Material | Spring Steel, Stainless Steel |
| Surface Treatment | Bright Finish,Zinc Plated,Passivated |
| Manufacturing | Stamping |
Dimension Chart of DIN6797J Internal Teeth Lock Washerss:
The DIN 6797J dimension chart provides the dimensional information needed to match the internal tooth lock washer with the corresponding screw or bolt. The inside diameter determines how the washer fits around the fastener, while the outside diameter defines the available bearing area beneath the fastener head. Washer thickness affects the seating height of the assembly, and the internal tooth geometry determines how the washer engages with the fastener and mating surface. The chart can be used to compare the main dimensions for each DIN 6797J size, including the inside diameter (d1), outside diameter (d2), washer thickness (s), and internal tooth dimensions. When selecting a washer, the inside diameter should provide sufficient clearance around the fastener while the outside diameter should fit properly beneath the fastener head. The tooth dimensions should also be considered where the washer must fit within a limited space around the fastener.
| Mon | Φ1.6 | Φ2 | Φ2.5 | Φ3 | Φ3.5 | Φ4 | Φ5 | Φ6 | Φ8 | Φ10 | Φ12 | Φ14 | Φ16 | Φ18 | Φ20 | Φ22 | Φ24 | Φ27 | Φ30 |
| d min | 1.7 | 2.2 | 2.7 | 3.2 | 3.7 | 4.3 | 5.3 | 6.4 | 8.4 | 10.5 | 13 | 15 | 17 | 19 | 21 | 23 | 25 | 28 | 31 |
| d max | 1.84 | 2.34 | 2.84 | 3.38 | 3.88 | 4.48 | 5.48 | 6.62 | 8.62 | 10.77 | 13.27 | 15.27 | 17.27 | 19.33 | 21.33 | 23.33 | 25.33 | 28.33 | 31.39 |
| dc max | 3.6 | 4.5 | 5.5 | 6 | 7 | 8 | 10 | 11 | 15 | 18 | 20.5 | 24 | 26 | 30 | 33 | 36 | 38 | 44 | 48 |
| dc min | 3.3 | 4.2 | 5.2 | 5.7 | 6.64 | 7.64 | 9.64 | 10.57 | 14.57 | 17.57 | 19.98 | 23.48 | 25.48 | 29.48 | 32.38 | 35.38 | 37.38 | 43.38 | 47.38 |
| h | 0.3 | 0.3 | 0.4 | 0.4 | 0.5 | 0.5 | 0.6 | 0.7 | 0.8 | 0.9 | 1 | 1 | 1.2 | 1.4 | 1.4 | 1.5 | 1.5 | 1.6 | 1.6 |
| Number of teeth min | 6 | 6 | 6 | 6 | 6 | 8 | 8 | 8 | 8 | 9 | 10 | 10 | 12 | 12 | 12 | 14 | 14 | 14 | 14 |
Application of DIN6797J Internal Teeth Lock Washers:
DIN 6797J Internal Teeth Lock Washers are particularly useful in assemblies where the fastener head is relatively small and the locking element needs to stay within the washer’s outer diameter. For example, Ø1.6–Ø5 mm washers can be used beneath small screws in PCB terminal blocks, miniature switches, sensors, encoder housings, and electronic control modules. Ø6–Ø12 mm sizes are suitable for fastening covers and components in electric motors, solenoid valves, gear reducers, small pumps, and control equipment, where vibration can cause conventional screw connections to loosen. Larger sizes from Ø14–Ø30 mm can be used with larger bolts in motor mounting assemblies, pump housings, agricultural machinery controls, machine-tool guards, and industrial equipment panels.
The 65Mn spring steel version, with a typical hardness of around 300 HV, is suited to mechanical and electrical assemblies where the washer must maintain its tooth profile under normal tightening and service conditions. It can be used beneath fasteners on motor terminal boxes, electrical control cabinets, actuator housings, sensor mounting systems, and machinery panels. Stainless steel versions are better suited to applications where the locking function must be combined with corrosion resistance, such as outdoor instrumentation, food-processing equipment, marine electrical enclosures, and moisture-exposed control systems.