DIN 984:2021 Internal Retaining Ring with Flange is installed in an internal bore groove to axially retain bearings, bushings, or internal components. The flanged design provides a more defined support boundary and is suitable for bore assemblies requiring reliable end positioning.
It is commonly used in gearbox housings, pump bodies, cylinders, bearing seats, and mechanical transmission components. The internal retaining ring saves space and simplifies the assembly structure without adding external fasteners.
Selection should consider bore diameter, groove geometry, tool access, and material elasticity. Rust-resistant or wear-resistant treatment can be specified to improve positioning stability during long-term service.

Dimensions unit: mm
| Apertured0 | 16 | 17 | 18 | 19 | 20 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 30 | |
| s | Max.=Nominal | 1 | 1 | 1 | 1 | 1 | 1 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 |
| Min. | 0.94 | 0.94 | 0.94 | 0.94 | 0.94 | 0.94 | 1.14 | 1.14 | 1.14 | 1.14 | 1.14 | 1.14 | 1.14 | |
| d3 | Nominal | 17.3 | 18.3 | 19.5 | 20.5 | 21.5 | 23.5 | 24.6 | 25.9 | 26.9 | 28.5 | 29.1 | 30.1 | 32.1 |
| Max. | 17.66 | 18.72 | 19.92 | 20.92 | 21.92 | 23.92 | 25.02 | 26.32 | 27.32 | 28.92 | 29.6 | 30.6 | 32.6 | |
| Min. | 17.2 | 18.17 | 19.37 | 20.37 | 21.37 | 23.37 | 24.39 | 25.69 | 26.69 | 28.29 | 28.85 | 29.85 | 31.85 | |
| a | Max. | 3.4 | 3.7 | 3.8 | 3.8 | 3.9 | 4 | 4.1 | 4.2 | 4.4 | 4.4 | 4.5 | 4.9 | 4.9 |
| b ② | ≈ | 2 | 2.1 | 2.2 | 2.2 | 2.3 | 2.5 | 2.6 | 2.6 | 2.7 | 2.8 | 2.9 | 2.9 | 3 |
| d5 | Min. | 1.7 | 1.7 | 1.7 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Thousand piece weight (steel) ≈kg | 0.72 | 0.8 | 0.9 | 0.99 | 1.06 | 1.28 | 1.48 | 1.6 | 1.72 | 2 | 2 | 2.1 | 2.35 | |
| Apertured0 | 32 | 35 | 36 | 38 | 40 | 42 | 44 | 45 | 47 | 48 | 50 | 52 | 55 | |
| s | Max.=Nominal | 1.2 | 1.5 | 1.5 | 1.5 | 1.75 | 1.75 | 1.75 | 1.75 | 1.75 | 1.75 | 2 | 2 | 2 |
| Min. | 1.14 | 1.44 | 1.44 | 1.44 | 1.69 | 1.69 | 1.69 | 1.69 | 1.69 | 1.69 | 1.93 | 1.93 | 1.93 | |
| d3 | Nominal | 34.4 | 37.8 | 38.8 | 40.8 | 43.5 | 45.5 | 47.5 | 48.5 | 50.5 | 51.5 | 54.2 | 56.2 | 59.2 |
| Max. | 34.9 | 38.3 | 39.3 | 41.3 | 44.4 | 46.4 | 48.4 | 49.4 | 51.6 | 52.6 | 55.3 | 57.3 | 60.3 | |
| Min. | 34.15 | 37.55 | 38.55 | 40.55 | 43.11 | 45.11 | 47.11 | 48.11 | 50.04 | 51.04 | 53.74 | 55.74 | 58.74 | |
| a | Max. | 5.1 | 5.5 | 5.6 | 6.1 | 7.2 | 7.2 | 7.2 | 7.2 | 7.2 | 7.2 | 8.2 | 8.2 | 8.2 |
| b ② | ≈ | 3.2 | 3.4 | 3.5 | 3.7 | 3.9 | 4.1 | 4.2 | 4.3 | 4.4 | 4.5 | 4.6 | 4.7 | 5 |
| d5 | Min. | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 |
| Thousand piece weight (steel) ≈kg | 2.5 | 4 | 4.15 | 4.4 | 5.3 | 6 | 6.45 | 6.6 | 6.9 | 7.5 | 8.5 | 9.4 | 9.75 | |
| Apertured0 | 57 | 58 | 60 | 62 | 65 | 67 | 70 | 72 | 75 | 80 | 85 | 90 | 95 | |
| s | Max.=Nominal | 2 | 2 | 2 | 2 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 3 | 3 | 3 |
| Min. | 1.93 | 1.93 | 1.93 | 1.93 | 2.43 | 2.43 | 2.43 | 2.43 | 2.43 | 2.43 | 2.92 | 2.92 | 2.92 | |
| d3 | Nominal | 61.2 | 62.2 | 64.2 | 66.2 | 69.2 | 71.5 | 74.5 | 76.5 | 79.5 | 85.5 | 90.5 | 95.5 | 100.5 |
| Max. | 62.3 | 63.3 | 65.3 | 67.3 | 70.3 | 72.6 | 75.6 | 77.6 | 80.6 | 86.8 | 91.8 | 96.8 | 101.8 | |
| Min. | 60.74 | 61.74 | 63.74 | 65.74 | 68.74 | 71.04 | 74.04 | 76.04 | 79.04 | 84.96 | 89.96 | 94.96 | 99.96 | |
| a | Max. | 8.2 | 8.2 | 8.2 | 8.2 | 9.5 | 10.2 | 10.2 | 10.2 | 10.2 | 10.2 | 12.2 | 12.2 | 12.2 |
| b ② | ≈ | 5.1 | 5.2 | 5.4 | 5.5 | 5.8 | 6 | 6.2 | 6.4 | 6.6 | 7 | 7.2 | 7.6 | 8.1 |
| d5 | Min. | 2.5 | 2.5 | 2.5 | 2.5 | 3 | 3 | 3 | 3 | 3 | 3 | 3.5 | 3.5 | 3.5 |
| Thousand piece weight (steel) ≈kg | 11.6 | 12 | 12.7 | 12.8 | 16.7 | 18.6 | 20.2 | 21.2 | 22.6 | 25 | 30.1 | 35.5 | 40 | |
| Apertured0 | 100 | 110 | 115 | 120 | 125 | 130 | 140 | 150 | 160 | 170 | |
| s | Max.=Nominal | 3 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Min. | 2.92 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | |
| d3 | Nominal | 105.5 | 117 | 122 | 127 | 132 | 137 | 147 | 158 | 169 | 179.5 |
| Max. | 106.8 | 118.3 | 123.5 | 128.5 | 133.5 | 138.5 | 148.5 | 159.5 | 170.5 | 181 | |
| Min. | 104.96 | 116.46 | 121.37 | 126.37 | 131.37 | 136.37 | 146.37 | 157.37 | 168.37 | 178.87 | |
| a | Max. | 12.2 | 12.2 | 12.2 | 12.2 | 12.2 | 12.2 | 14.2 | 14.2 | 14.2 | 14.2 |
| b ② | ≈ | 8.4 | 9 | 9.3 | 9.7 | 10 | 10.2 | 10.7 | 11.2 | 11.6 | 12.2 |
| d5 | Min. | 3.5 | 3.5 | 3.5 | 3.5 | 4 | 4 | 4 | 4 | 4 | 4 |
| Thousand piece weight (steel) ≈kg | 43.5 | 73 | 82 | 87 | 92 | 102 | 112 | 123 | 133 | 145 | |
① Material:
Spring steel C67S or C75S according to standard DIN EN 10132-4 (selected by manufacturer)
Hardness:
Shaft diameter ≤ 48 mm, 470 HV to 580 HV or 47 HRC to 54 HRC;
48 mm < shaft diameter ≤ 140mm, 435 HV to 530 HV or 44 HRC to 51 HRC.
Note: Hardness value is converted according to DIN EN ISO 18265
② Dimension b shall not exceed dimension a (max).
FAQ
A: We take every inquiry seriously. On working days, we will respond within 12 hours after receiving your inquiry.
A: We focus on the production of fasteners made of carbon steel, stainless steel, and low-alloy steel. We are a direct manufacturer with independent production capacity. DIN 984:2021 Internal Retaining Ring Factory. We own several fastener manufacturing facilities and have an international sales department, providing full-process services from production to export.
A: Customized production is our core business. We can develop and manufacture products based on the drawings or samples you provide.
A: Yes. In addition to custom products, we also produce general construction machinery parts (GET parts) for equipment such as excavators, including bucket teeth, tooth holders, corner blades, pins, clips, bolts and nuts. DIN 984:2021 Internal Retaining Ring Wholesale.
A: We have 12 energy-efficient and environmentally friendly modern production lines (including one fully automatic shell molding line and four heat treatment lines), with an annual production capacity exceeding 20,000 tons, enabling us to steadily meet various order requirements.
A: Trade terms (such as FOB, CIF, etc.) are confirmed when quoting. For batch production, we typically require a 30% deposit, with the balance paid against the copy of the bill of lading. T/T is the main payment method accepted, and L/C can also be negotiated.
A: We are only 35 km away from Shanghai Port and Ningbo Port, so sea freight is the main mode of transportation, which is convenient and efficient. For urgent deliveries, we can also arrange air freight via Ningbo or Shanghai airports.
About Us
Better Fastener is a professional fastener enterprise specializing in the manufacturing of steel washers, stainless steel washers, spring washers and sealingwashers. Founded in 2001 as a washer factory, the company expanded into a comprehensive enterprise integrating washers, nuts, bolts, spring nuts and other fastener products in 2010. DIN 984:2021 Internal Retaining Ring Suppliers in China.
The company positions itself as a provider of comprehensive one-stop services for customers, relying on technological R&D, industrial investment and trade distribution.
With an experienced professional team and a sound sales network, Better Fastener has achieved excellent sales performance in both domestic and foreign markets,and has grown into one of the competitive manufacturers and suppliers in China's industrial fastener industry.
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