Material | Carbon steel ,Stainless steel ,Alloy |
Grade | 100HV ,140HV,200HV,300HV |
Standard | DIN,ASTM,ANSI,JIS,EN,ISO,AS,GB |
Surface Treatment | Blackened,Zinc plate,Yellow zinc,HDG,etc |
Diameter | M3-M100 |
Salt Spray Test | 24hr-1000hr |
Testing equipment | Automatic Optic Inspector,Projecting Apparatus,Salt Spray Test,Hardness/Tensile Machine |
Certification | SGS,RoHS,Material Certication,PPAP |
Sample | Accepted,we will send samples for your approval |
Package Description | Plastic bag or According to the customer’s requirements |
Delivery Term | EXW,FOB,CIF,CNF |
Lead Time | Samples10- 15workdays,Mass productions 15-20 workdays after payment received. |
Payment Term | T/T, Paypal,Cash |
Primary Functions & Core Purpose:
- Protects the Bearing Surface: Prevents damage to soft materials (like wood or plastic) and protects painted or finished surfaces from being marred by the rotating fastener during tightening.
- Improves Joint Stability: By providing a smooth, hard bearing surface, it reduces friction under the fastener head/nut, allows for more accurate torque application, and helps maintain preload.
- Compensates for Oversized Holes: It can be used in slotted or oversized holes to ensure the fastener head has a proper surface to bear against.
- Versatile Sizes: Available in a wide range of inner diameters (ID) and outer diameters (OD) to match standard fastener sizes (e.g., M6, 1/4").
- Material & Grade Options: Commonly made from low-carbon steel, stainless steel (A2/A4), or brass. In standardized systems like ISO, performance is often designated by hardness grades (e.g., 200HV for hardened steel washers).
- Standardization: Widely governed by standards such as ISO 7089 (Metric) and ANSI/ASME B18.22.1 (Imperial).
Typical Applications:
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