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Product Specifications:
| Item | Extra Thick Washer |
| Finish | Black Oxide |
| Fits Bolt Sizes | M30 |
| Flat Washer Type | Standard |
| For Screw Size | M30 |
| Hardness | Rockwell C4 |
| Inside Dia. | 31 mm |
| Inside Diameter Tolerance | -0.01" to +0.01" |
| Material | Steel |
| Material Grade/class | Case Hardened |
| Maximum Thickness | 6.5 mm |
| Minimum Thickness | 6.5 mm |
| Outside Dia. | 48 mm |
| Outside Diameter Tolerance | -0.01" to +0.01" |
| Rockwell Hardness | C4 |
| System Of Measurement | Metric |
| Thickness | 6.5 mm |
| Thickness Tolerance | -0.5 mm to +0.4 mm |
| Washer Type | Standard Washer |
Shipping Info:
| Ship weight (kg) | 0.05 |
| Ship height (cm) | 0.76 |
| Ship length (cm) | 7.62 |
| Ship width (cm) | 5.08 |
| HS code | 7318220000 |
| Country of Origin | US |
Product Variants
| Product | Model | Fits Bolt Sizes | Inside Dia. | Outside Dia. | Thickness | Thickness Tolerance | Hardness | Color | Tensile Strength | Pkg. Qty. | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
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5KEF4 | M30 | 31 mm | 56 mm | 5 mm | -0.6 mm to +0.6 mm | Rockwell C29 | - | - | 1 | €1.89 | |
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5KEF6 | M36 | 37 mm | 66 mm | 6 mm | -0.6 mm to +0.6 mm | Rockwell C29 | - | - | 1 | €3.33 | |
![]() |
5KEG0 | M48 | 50 mm | 92 mm | 8 mm | -0.8 mm to +0.8 mm | Rockwell C29 | - | - | 1 | €10.95 | |
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Z8803 | M3 | 3.2 mm | 8 mm | 2 mm | -0.5 mm to +0.4 mm | Rockwell C4 | - | - | 25 | €22.83 | |
![]() |
Z8804 | M4 | 4.3 mm | 10 mm | 2 mm | -0.5 mm to +0.4 mm | Rockwell C4 | - | - | 25 | €24.26 | |
![]() |
Z8805 | M5 | 5.3 mm | 11 mm | 2 mm | -0.5 mm to +0.4 mm | Rockwell C4 | - | - | 10 | €11.15 | |
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Z8806 | M6 | 6.4 mm | 13 mm | 2.5 mm | -0.5 mm to +0.4 mm | Rockwell C4 | - | - | 10 | €11.26 |
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APPROVED VENDOR Z8870 Extra Thick Washer, M30 Fits Bolt Size, Std, 31 mm I.D., Blk Oxide
€5.61 /unit







