Slotted Nuts
Product: Hexagonal Slotted Nut(Castle Nut)
Standard: DIN935
Raw material: SWRCH45K,40CR,42CRMO,etc.
Surface: Plain,zinc plated,black oxide,H.D.G,etc.
Specification Range: M6-24
Property Class:6/8/10
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Product Introduction
Product: Hexagonal Slotted Nut(Castle Nut)
Standard: DIN935
Raw material: SWRCH45K,40CR,42CRMO,etc.
Surface: Plain,zinc plated,black oxide,H.D.G,etc.
Specification Range: M6-24
Property Class:6/8/10
DIN935 is a German standard hexagonal slotted nut (also known as castle nut), which is mainly used in high-vibration applications requiring cotter pin locking. It is manufactured in accordance with the DIN 935 series standards. Common performance grades of steel nuts are Grade 6/8/10, and the corresponding grades of stainless steel nuts are A2-70/A2-50. The production process mainly includes cold heading/hot forging, slot milling, heat treatment and surface treatment. Alternative products include ISO 7035, GB 6181 and various types of lock nuts.
| 螺纹尺寸 d |
M4 | M5 | M6 | (M7) | M8 | M10 | M12 | (M14) | M16 | (M18) | M20 | (M22) | M24 | (M27) | M30 | (M33) | |
| P | 螺距(粗牙) | 0.7 | 0.8 | 1 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | 2.5 | 2.5 | 2.5 | 3 | 3 | 3.5 | 3.5 |
| 细牙1 | - | - | - | 1 | 1.25 | 1.5 | 1.5 | 1.5 | 1.5 | 2 | 1.5 | 2 | 2 | 2 | 2 | ||
| 细牙2 | - | - | - | - | - | 1 | 1.25 | 2 | 1.5 | 2 | - | - | - | ||||
| da | 最大值 | 4.60 | 5.75 | 6.75 | 7.75 | 8.75 | 10.80 | 13.00 | 15.10 | 17.30 | 19.50 | 21.60 | 23.80 | 25.90 | 29.20 | 32.40 | 35.60 |
| 最小值 | 4.00 | 5.00 | 6.00 | 7.00 | 8.00 | 10.00 | 12.00 | 14.00 | 16.00 | 18.00 | 20.00 | 22.00 | 24.00 | 27.00 | 30.00 | 33.00 | |
| de | 最大值 | 1 | 1 | 1 | 1 | 1 | / | 16.00 | 18.00 | 22.00 | 25.00 | 28.00 | 32.00 | 34.00 | 38.00 | 42.00 | 46.00 |
| 最小值 | / | 1 | / | 1 | / | / | 15.57 | 17.57 | 21.48 | 24.30 | 27.30 | 31.00 | 33.00 | 37.00 | 41.00 | 45.00 | |
| dw | 最小值 | 5.90 | 6.90 | 8.90 | 9.50 | 11.60 | 14.60 | 16.60 | 19.60 | 22.50 | 24.90 | 27.70 | 31.40 | 33.20 | 38.00 | 42.70 | 46.60 |
| e | 最小值 | 7.66 | 8.79 | 11.05 | 12.12 | 14.38 | 17.77 | 20.03 | 23.35 | 26.75 | 29.56 | 32.95 | 37.29 | 39.55 | 45.20 | 50.85 | 55.37 |
| m | 最大值=公称 | 5.0 | 6.0 | 7.5 | 8.0 | 9.5 | 12.0 | 15.0 | 16.0 | 19.0 | 21.0 | 22.0 | 26.0 | 27.0 | 30.0 | 33.0 | 35.0 |
| 最小值 | 4.70 | 5.70 | 7.14 | 7.64 | 9.14 | 11.57 | 14.57 | 15.57 | 18.48 | 20.16 | 21.16 | 25.16 | 26.16 | 29.16 | 32.00 | 34.00 | |
| W | 最大值 | 3.20 | 4.00 | 5.00 | 5.50 | 6.50 | 8.00 | 10.00 | 11.00 | 13.00 | 15.00 | 16.00 | 18.00 | 19.00 | 22.00 | 24.00 | 26.00 |
| 最小值 | 2.90 | 3.70 | 4.70 | 5.20 | 6.14 | 7.64 | 9.64 | 10.57 | 12.57 | 14.57 | 15.57 | 17.57 | 18.48 | 21.48 | 23.48 | 25.48 | |
| m₁ | 最小值 | 2.30 | 3.00 | 3.80 | 4.20 | 4.90 | 6.10 | 7.70 | 8.20 | 9.80 | 11.20 | 11.90 | 13.50 | 14.20 | 16.60 | 18.20 | 19.80 |
| n | 最大值 | 1.45 | 1.65 | 2.25 | 2.25 | 2.75 | 3.05 | 3.80 | 3.80 | 4.80 | 4.80 | 4.80 | 5.80 | 5.80 | 5.80 | 7.36 | 7.36 |
| 最小值 | 1.20 | 1.40 | 2.00 | 2.00 | 2.50 | 2.80 | 3.50 | 3.50 | 4.50 | 4.50 | 4.50 | 5.50 | 5.50 | 5.50 | 7.00 | 7.00 | |
| S | 最大值=公称 | 7 | 8 | 10 | 11 | 13 | 16 | 18 | 21 | 24 | 27 | 30 | 34 | 36 | 41 | 46 | 50 |
| 最小值 | 6.78 | 7.78 | 9.78 | 10.73 | 12.73 | 15.73 | 17.73 | 20.67 | 23.67 | 26.16 | 29.16 | 33.00 | 35.00 | 40.00 | 45.00 | 49.00 | |
Product Overview and Core Applications
DIN935 is a hexagonal nut with radial slots at one end. The number of slots increases with the nut size (6 slots for nuts ≤ M39, 8 slots for M42-M68, and 10 slots for nuts ≥ M72). It is used in conjunction with drilled bolts and cotter pins, and achieves anti-loosening effect by inserting cotter pins through the slots. It is suitable for safety fastening in vibration-intensive working conditions in industries such as automotive, machinery and aerospace to prevent accidental loosening of nuts.
Production Standards and Performance Grades
• Main standards: DIN 935-1 (metric coarse/fine threads, product grade A/B), DIN 935-2 (M42-M160×6, grade B), DIN 935-3 (coarse threads, grade C).
• Equivalent standards: ISO 7035, GB 6181, ASTM A563 (for partial specifications).
• Material performance standards: Steel parts refer to DIN EN ISO 898-2, stainless steel parts refer to DIN EN ISO 3506-2, and non-ferrous metal parts refer to DIN EN 28839.
Mechanical Properties (Typical Values)
- • Carbon steel (Grade 8): Tensile strength ≥ 800MPa, yield strength ≥ 640MPa. Proof load shall comply with the requirements of DIN EN ISO 898-2.
- • Stainless steel (A2-70): Tensile strength ≥ 700MPa, yield strength ≥ 450MPa. Proof load shall comply with the requirements of DIN EN ISO 3506-2.
- • Key indicators: Hardness, decarburization layer, thread accuracy, slot width and slot depth tolerance shall meet the dimensional and geometric tolerance requirements specified in DIN 935-1.
Production Process
Material Selection:
Carbon steel (e.g., SWRCH35K), stainless steel (304/316), copper alloy, selected according to performance grade and corrosion resistance requirements.
Forming:
Cold heading (for small and medium-sized specifications) or hot forging (for large-sized specifications) to produce hexagonal blanks, ensuring metal flow lines and mechanical strength.
Slotting:
Milling or sawing to process radial slots, controlling slot width, slot depth and symmetry to ensure smooth assembly of cotter pins.
Heat Treatment:
Quenching and tempering are required for Grade 8/10 carbon steel nuts to improve hardness and strength; stainless steel nuts generally do not require heat treatment (A2-70 nuts are in solution-annealed state).
Surface Treatment:
Zinc plating, colored zinc plating, dacromet coating, black oxide coating, etc., to improve corrosion resistance.
Inspection:
Full-size inspection, thread go-no-go gauge test, hardness test, proof load test, surface quality inspection.
Key Production Points and Quality Control
• The coaxiality tolerance between the slot position and the bolt hole shall be ≤ 0.1mm, and the slot width tolerance shall be ± 0.1mm to avoid cotter pin jamming or loosening.
• After heat treatment, the decarburization layer shall be controlled within ≤ 0.01d to prevent the reduction of thread strength.
• After surface treatment, the salt spray test duration shall be ≥ 48 hours (for galvanized passivation) to ensure corrosion resistance.
DIN935 hexagonal slotted nuts are primarily designed for high-vibration, safety-critical fastening scenarios where reliable anti-loosening performance is required.
Core application fields are as follows: Automotive and transportation industry,Engineering machinery and heavy equipment,Aerospace and rail transit,Industrial equipment and power machinery,Special equipment and military industry.
Main Sales Markets： Europe, the Middle East, Southeast Asia
Packaging & Logistics
- Main packaging materials: Small bags, small boxes, cartons, pallets, iron drums.
- Customized packaging is available according to customer requirements.
- Flexible bulk ordering plans are provided; transportation terms and delivery schedules are negotiable.
Certification & Warranty
We are certified by ISO9001:2015, IATF16949:2016, and other international quality standard certifications.
Long-term quality assurance and comprehensive after-sales service are provided.
Established in 2005, our company has evolved over two decades of continuous development into a leading regional enterprise in the fastener industry with fully automated end-to-end production. With an annual output value exceeding RMB 130 million, our product range covers diverse market segments from mid-range to high-end and is distributed worldwide
Our factory & quipment
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