Conical Contact Washers, NFE 25-511
1. Description
Contact Washers are Conical Shaped Lock Washers, formed with a ribbed top surface. The conical shape exerts locking force 360° around the underside of the screw head or nut. The ribbed top surface further enhances the locking force and resists the torqued fastener connection potential for loosening under pressure and vibration. Contact Washers are made from high carbon spring steel or stainless steel. They are manufactured in a variety of ID, OD and thickness combinations to suit various applications. The washers are produced in accordance with French National Standard NFE 25-511. Contact Washers can be ordered with either a plain smooth bearing surface or with barbs for grounding purposes when mounting surfaces are painted or coated. The Contact Washers with barbs are also named Grounding Washers.
1. Specification Requirements
Contact Washers NFE 25-511 | ||||||||||||||
M | Type | d | D | s | h min | h max | Denti | Forza Elastica | Forza Elastica | Weight/M | Box | |||
mm | mm | mm | mm | mm | mm | mm | mm | no | N | N | kgs | no | ||
3 | N | 3.1 | +0.25 | 6 | ±0.24 | 0.5 | ±0.03 | 0.70 | 0.90 | 28 | 500 | 220 | 0.180 | 2,000 |
M | 8 | ±0.29 | 0.6 | 0.80 | 1.00 | 600 | 2,000 | |||||||
L | 10 | ±0.29 | 0.6 | 0.95 | 1.20 | 600 | 2,000 | |||||||
4 | N | 4.1 | +0.30 | 8 | ±0.29 | 0.8 | ±0.04 | 1.00 | 1.20 | 32 | 2800 | 1000 | 0.435 | 2,000 |
M | 10 | ±0.29 | 0.9 | 1.15 | 1.40 | 2800 | 2,000 | |||||||
L | 14 | ±0.35 | 1.0 | 1.40 | 1.80 | 2000 | 2,000 | |||||||
5 | N | 5.1 | +0.30 | 10 | ±0.29 | 1.0 | ±0.04 | 1.25 | 1.50 | 36 | 3500 | 1400 | 0.720 | 1,000 |
M | 12 | ±0.35 | 1.1 | 1.45 | 1.80 | 3500 | 1,000 | |||||||
L | 16 | ±0.35 | 1.2 | 1.70 | 2.10 | 3000 | 1,000 | |||||||
6 | N | 6.1 | +0.30 | 12 | ±0.35 | 1.2 | ±0.04 | 1.55 | 1.85 | 45 | 5300 | 2100 | 0.890 | 1,000 |
M | 14 | ±0.35 | 1.3 | 1.75 | 2.10 | 5000 | 1.180 | 1,000 | ||||||
L | 18 | ±0.35 | 1.4 | 2.10 | 2.50 | 4500 | 2.340 | 1,000 | ||||||
8 | N | 8.2 | +0.36 | 16 | ±0.35 | 1.4 | ±0.04 | 1.80 | 2.20 | 45 | 6500 | 3200 | 1.440 | 1,000 |
M | 18 | ±0.35 | 1.4 | 1.90 | 2.35 | 6500 | 2.070 | 1,000 | ||||||
L | 22 | ±0.42 | 1.6 | ±0.05 | 2.20 | 2.70 | 8400 | 3.860 | 1,000 | |||||
10 | N | 10.2 | +0.36 | 20 | ±0.42 | 1.6 | ±0.05 | 2.10 | 2.60 | 45 | 9500 | 3700 | 2.600 | 1,000 |
M | 22 | ±0.42 | 1.6 | 2.25 | 2.75 | 12500 | 3.390 | 1,000 | ||||||
L | 27 | ±0.42 | 1.8 | 2.60 | 3.10 | 11000 | 6.480 | 500 | ||||||
12 | N | 12.4 | +0.43 | 24 | ±0.42 | 1.8 | ±0.05 | 2.40 | 2.90 | 45 | 21500 | 4300 | 4.130 | 500 |
M | 27 | ±0.42 | 1.8 | 2.60 | 3.10 | 22500 | 5.870 | 500 | ||||||
L | 32 | ±0.50 | 2.0 | 3.10 | 3.60 | 28000 | 10.100 | 250 | ||||||
14 | M | 14.4 | +0.43 | 30 | ±0.42 | 2.4 | ±0.06 | 3.20 | 3.70 | 45 | 23000 | 6300 | 9.350 | 250 |
16 | M | 16.4 | +0.43 | 32 | ±0.50 | 2.8 | ±0.06 | 3.60 | 4.10 | 60 | 25000 | 10000 | 12.000 | 250 |
20 | M | 20.5 | +0.52 | 40 | ±0.50 | 3.2 | ±0.06 | 4.30 | 4.90 | 60 | 26500 | 12500 | 21.070 | 200 |
*Type：N - Narrow, M - Medium, L - Large
● Dimensions: NFE 25-511.
● Available Materials:
– Carbon Steel SAE 1060.
– Stainless Steel.
● Available Finishes:
– Plain w/light protective oil.
– Phosphated.
– Zinc plated clear (ZC).
– Zinc plated yellow (YZ).
– Mechanical zinc yellow.
– Stainless steel.
– Customized.
