Qingdao Smart Source Trading Co., Ltd.

1. Standard Compliance
 - Metric: DIN 125, ISO 7089, ISO 7090, GB/T 97.1, GB/T 848
- Imperial: USS, SAE, ANSI B18.22.1, ASTM F436 
- Others: BS 4320, JIS B 1256
 2. Size Range (Standard)
- Nominal Size: M2 – M100 (Metric); #2 – 4" (Imperial)
- Inner Diameter (ID): 2mm – 105mm
- Outer Diameter (OD): 5mm – 200mm
- Thickness (T): 0.3mm – 12mm
-Tolerance: ±0.01mm – ±0.05mm (precision)
 3. Surface Treatment
 - Stainless Steel: Passivated, Natural, Electropolished
- Carbon Steel: Zinc Plated (Cr3+), Hot Dip Galvanized, Black Oxide, Phosphate
- Brass/Copper: Natural, Tin Plated, Nickel Plated
- Aluminum: Anodized
4. Key Features
 - Even load distribution for bolts/nuts
- Prevents loosening under vibration
- Protects fastened surfaces from damage
- Acts as spacer, seal, or wear pad
- Corrosion resistance (material dependent)
- High temperature & pressure resistance
- Precision stamped, burr-free edges
- RoHS & REACH compliant