EternalFast provides all DIN 6900 assembly types, especially Type G triple assemblies , widely used in automotive and electronic production lines to improve assembly efficiency.
DIN 6900 Standard Assembly Types
| Type | Base Screw (Ref.) | Washer Combination | Washer Standard | Functional Description |
|---|---|---|---|---|
| Type A | DIN 7985 / DIN 933 | Screw + Plain Washer | DIN 125 / 433 | Increases load-bearing surface and protects the workpiece. |
| Type B | DIN 7985 / DIN 912 | Screw + Spring Lock Washer | DIN 127 | Basic anti-loosening by maintaining constant spring tension. |
| Type C | DIN 912 / DIN 933 | Screw + Conical Spring Washer | DIN 6796 | Heavy-duty anti-loosening for high-load bolted connections. |
| Type D | DIN 7985 / DIN 965 | Screw + External Tooth Washer | DIN 6797-A | High vibration resistance through tooth-bite into the surface. |
| Type E | DIN 7985 / DIN 966 | Screw + Internal Tooth Washer | DIN 6797-J | Used for smaller head screws; provides neat finish and anti-vibration. |
| Type G | DIN 7985 / DIN 933 | Screw + Plain + Spring Washer | DIN 125 + 127 | Most Common (Triple) ; combines surface protection and anti-loosening. |
| Type H | DIN 7985 / DIN 912 | Screw + Plain + Tooth Washer | DIN 125 + 6798 | Enhanced vibration resistance while maintaining surface integrity. |
1. Automotive & Electronics Assembly
Engine Peripheral Components
- Recommended: M5 * 16 (Type B) / M6 * 25 (Type A) | Grade 8.8 | Zinc-Nickel Plated
- Technical Insight: Type B (with Spring Washer) is essential for high-vibration zones to maintain preload. For aluminum housings, Type A (with Plain Washer) prevents surface indentation. Zinc-Nickel plating ensures 720h+ salt spray resistance.
Precision PCB & Enclosure Mounting
- Recommended: M2.5 * 6 (Type C) / M3 * 10 (Type D) | Stainless Steel A2
- Technical Insight: Type C (Internal Tooth) or Type D (External Tooth) provides multiple contact points to ensure electrical grounding and anti-loosening on compact circuit boards without the risk of loose washers falling into the circuitry.
2. Electrical Infrastructure & Switchgear
Terminal Block Connections
- Recommended: M4 * 12 (Type G) / M5 * 20 (Type F) | Grade 5.8 | Tin Plated
- Technical Insight: Type G (with Large Plain Washer) or Type F (with Conical Spring Washer)provides a superior contact area and constant pressure, critical for stabilizing conductivity during thermal expansion cycles in heavy-duty switchgear.
Cabinet Door & Panel Grounding
- Recommended: M6 * 15 (Type D) | Grade 8.8 | Blue Zinc
- Technical Insight: The Type D (External Tooth) captive washer is designed to "bite" through protective paint or oxidation layers, establishing a direct metal-to-metal ground path for safety and EMI shielding.
3. Home Appliances & HVAC Systems
Compressor & Motor Mounting
- Recommended: M6 * 30 (Type B+A) / M8 * 45 (Type B) | Grade 8.8 | Cr3+ Zinc
- Technical Insight: Utilizing a Type B (Spring Washer) assembly eliminates the "chatter" noise caused by loose components. It ensures the locking element remains perfectly centered, preventing hardware migration in high-RPM appliances.
Air Handling Unit (AHU) Panels
- Recommended: M5 * 20 (Type A) / M6 * 35 (Type A) | Stainless Steel A2-70
- Technical Insight: Type A (Plain Washer) distributes the clamping load over thin-gauge sheet metal, preventing panel deformation while ensuring a leak-proof seal in pressurized HVAC environments.
4. Industrial Machinery & Automation
Conveyor System Brackets
- Recommended: M8 * 40 (Type B) / M10 * 55 (Type B) | Grade 10.9 | Zinc Flake (Geomet)
- Technical Insight: High-tensile Type B assemblies are the standard for logistics sorting lines. The captive spring washer handles dynamic shear loads, while the Geomet coating prevents hydrogen embrittlement in high-strength steel.
Robot Arm Sensor Mounting
- Recommended: M3 * 8 (Type C) / M4 * 12 (Type C) | Stainless Steel A4-80 (SS316)
- Technical Insight: In aggressive cleaning environments, Type C (Internal Tooth) provides a low-profile locking solution that won't snag. A4-80 (316) prevents metal fatigue and ensures chemical resistance in food-grade automation.