Crest cup washer screw metric machine threaded SEMS fasteners spring washers

When high clamp load is required, Crest Cup spring washer assembly is the solution. Crest cup washer screw’s performance engineered compression washer provides a flat and smooth bearing surface to provide higher tension, resulting in a reliable assembly for the life of the product.
Benefits
Can eliminate double washer combinations
Eliminates handling of loose washers and screws
Adapts easily to automatic assembly equipment
Maximizes joint integrity
Helps prevent embedding, notching and marring in application materials

SEMS screw combines two separate parts into one pre-assembled, low-cost fastener. With washers under the head, SEMS screw is fast, permanent, and easily adaptable to many applications. 

Properties of various Torx drives
Size  Point-to-point distance   Maximum torque range  ~ E Torx
(in) (mm) (lb•ft) (N•m)
T1 0.031 0.81 0.01–0.02 0.02–0.03  
T2 0.036 0.93 0.05–0.07 0.07–0.09  
T3 0.046 1.1 0.10–0.13 0.14–0.18  
T4 0.05 1.28 0.16–0.21 0.22–0.28  
T5 0.055 1.42 0.32–0.38 0.43–0.51 E2
T5.5          
T6 0.066 1.7 0.55–0.66 0.75–0.90  
T7 0.078 1.99 1.0–1.3 1.4–1.7  
T8 0.09 2.31 1.6–1.9 2.2–2.6  
T9 0.098 2.5 2.1–2.5 2.8–3.4  
T10 0.107 2.74 2.7–3.3 3.7–4.5  
T15 0.128 3.27 4.7–5.7 6.4–7.7  
T20 0.151 3.86 7.74–9.37 10.5–12.7 E4
T25 0.173 4.43 11.7–14.0 15.9–19 E5
T27 0.195 4.99 16.6–19.8 22.5–26.9  
T30 0.216 5.52 22.9–27.6 31.1–37.4 E6
T35          
T40 0.26 6.65 39.9–48.0 54.1–65.1 E8
T45 0.306 7.82 63.4–76.1 86–103.2  
T47 GM-Style        
T50 0.346 8.83 97.4–117 132–158 E10
T55 0.44 11.22 161–189 218–256 E12
T60 0.519 13.25 280–328 379–445 E16
T70 0.61 15.51 465–516 630–700 E18
T80 0.69 17.54 696–773 943–1048 E20
T90 0.784 19.92 984–1094 1334–1483  
T100 0.871 22.13 1359–1511 1843–2048 E24

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Category Crest cup washer screw
Finish Galvanization or As request
Type Machine-threaded or As request
Material Teflon/Brass/Stainless steel/carbon steel/Aluminum
Brand Ever Hardware
Place of origin China Mainland
Size option As request
Color Natural or as request

Crest cup washer screw metric machine threaded SEMS fasteners spring washersEver Hardware Industrial Limited

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