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  • Special Screws
  • Chemical Resistance

Plastic Screw - Socket Head Cap Screws - PVDF

SPV-C

  • Chemical-proof

Dimension Drawing

SPV-CPlastic Screw - Hex Socket Head Cap Screws - PVDF寸法図

Specs/CAD

Select

M (Coarse)
Nominal of Thread
All
M3
M4
M5
M6
M8
M10
M12
L
All
5
6
8
10
12
15
20
25
30
35
40

Unit : mm

Part Number M (Coarse)
Nominal of Thread
Pitch L D1 L1 B Tension Rupture Load
(N)*1
Torsional Torque
(N・m)*1
Qty per Pack Mass
(g)
Price
(USD)
CAD
Download
QTY
(Pack)
SPV-M3-5-C M3 0.5 5 5.5 3 2.5 227 0.11 20 0.15 48.65 CAD Cart
SPV-M3-6-C M3 0.5 6 5.5 3 2.5 227 0.11 20 0.16 50.53 CAD Cart
SPV-M3-8-C M3 0.5 8 5.5 3 2.5 227 0.11 20 0.18 50.53 CAD Cart
SPV-M3-10-C M3 0.5 10 5.5 3 2.5 227 0.11 20 0.2 51.39 CAD Cart
SPV-M3-12-C M3 0.5 12 5.5 3 2.5 227 0.11 20 0.22 51.39 CAD Cart
SPV-M3-15-C M3 0.5 15 5.5 3 2.5 227 0.11 20 0.23 52.29 CAD Cart
SPV-M4-5-C M4 0.7 5 7 4 3 429 0.26 20 0.33 51.39 CAD Cart
SPV-M4-6-C M4 0.7 6 7 4 3 429 0.26 20 0.34 52.29 CAD Cart
SPV-M4-8-C M4 0.7 8 7 4 3 429 0.26 20 0.38 52.29 CAD Cart
SPV-M4-10-C M4 0.7 10 7 4 3 429 0.26 20 0.41 53.47 CAD Cart
SPV-M4-12-C M4 0.7 12 7 4 3 429 0.26 20 0.45 53.47 CAD Cart
SPV-M4-15-C M4 0.7 15 7 4 3 429 0.26 20 0.5 54.11 CAD Cart
SPV-M4-20-C M4 0.7 20 7 4 3 429 0.26 20 0.61 56.67 CAD Cart
SPV-M5-10-C M5 0.8 10 8.5 5 4 688 0.44 20 0.62 54.09 CAD Cart
SPV-M5-12-C M5 0.8 12 8.5 5 4 688 0.44 20 0.68 56.42 CAD Cart
SPV-M5-15-C M5 0.8 15 8.5 5 4 688 0.44 20 0.79 58.08 CAD Cart
SPV-M5-20-C M5 0.8 20 8.5 5 4 688 0.44 20 0.92 61.88 CAD Cart
SPV-M5-25-C M5 0.8 25 8.5 5 4 688 0.44 20 1.1 65.91 CAD Cart
SPV-M5-30-C M5 0.8 30 8.5 5 4 688 0.44 20 1.3 69.44 CAD Cart
SPV-M5-35-C M5 0.8 35 8.5 5 4 688 0.44 20 1.5 73.79 CAD Cart
SPV-M6-10-C M6 1 10 10 6 5 960 0.81 10 1.1 31.82 CAD Cart
SPV-M6-12-C M6 1 12 10 6 5 960 0.81 10 1.2 33.41 CAD Cart
SPV-M6-15-C M6 1 15 10 6 5 960 0.81 10 1.3 33.98 CAD Cart
SPV-M6-20-C M6 1 20 10 6 5 960 0.81 10 1.5 36.15 CAD Cart
SPV-M6-25-C M6 1 25 10 6 5 960 0.81 10 1.7 38.88 CAD Cart
SPV-M6-30-C M6 1 30 10 6 5 960 0.81 10 1.9 41.76 CAD Cart
SPV-M6-35-C M6 1 35 10 6 5 960 0.81 10 2.3 43.90 CAD Cart
SPV-M6-40-C M6 1 40 10 6 5 960 0.81 10 2.6 45.79 CAD Cart
SPV-M8-10-C M8 1.25 10 13 8 6 1803 1.56 10 2.4 66.19 CAD Cart
SPV-M8-12-C M8 1.25 12 13 8 6 1803 1.56 10 2.5 66.19 CAD Cart
SPV-M8-15-C M8 1.25 15 13 8 6 1803 1.56 10 2.8 66.19 CAD Cart
SPV-M8-20-C M8 1.25 20 13 8 6 1803 1.56 10 3.1 66.19 CAD Cart
SPV-M8-25-C M8 1.25 25 13 8 6 1803 1.56 10 3.5 66.19 CAD Cart
SPV-M8-30-C M8 1.25 30 13 8 6 1803 1.56 10 3.9 77.41 CAD Cart
SPV-M8-35-C M8 1.25 35 13 8 6 1803 1.56 10 4.4 77.41 CAD Cart
SPV-M8-40-C M8 1.25 40 13 8 6 1803 1.56 10 4.8 77.41 CAD Cart
SPV-M10-15-C M10 1.5 15 16 10 8 2824 3.16 10 4.7 66.19 CAD Cart
SPV-M10-20-C M10 1.5 20 16 10 8 2824 3.16 10 5.3 72.05 CAD Cart
SPV-M10-25-C M10 1.5 25 16 10 8 2824 3.16 10 5.9 78.17 CAD Cart
SPV-M10-30-C M10 1.5 30 16 10 8 2824 3.16 10 6.4 84.48 CAD Cart
SPV-M10-35-C M10 1.5 35 16 10 8 2824 3.16 10 7 90.09 CAD Cart
SPV-M10-40-C M10 1.5 40 16 10 8 2824 3.16 10 7.6 107.76 CAD Cart
SPV-M12-20-C M12 1.75 20 18 12 10 4249 5.73 10 7.4 96.26 CAD Cart
SPV-M12-25-C M12 1.75 25 18 12 10 4249 5.73 10 8.2 101.84 CAD Cart
SPV-M12-30-C M12 1.75 30 18 12 10 4249 5.73 10 9.1 107.21 CAD Cart
SPV-M12-35-C M12 1.75 35 18 12 10 4249 5.73 10 9.9 126.22 CAD Cart
SPV-M12-40-C M12 1.75 40 18 12 10 4249 5.73 10 11 137.88 CAD Cart
Part Number M (Coarse)
Nominal of Thread
Pitch L D1 L1 B Tension Rupture Load
(N)*1
Torsional Torque
(N・m)*1
Qty per Pack Mass
(g)
Price
(USD)
CAD
Download
QTY
(Pack)
SPV-M3-5-C M3 0.5 5 5.5 3 2.5 227 0.11 20 0.15 48.65 CAD Cart
SPV-M3-6-C M3 0.5 6 5.5 3 2.5 227 0.11 20 0.16 50.53 CAD Cart
SPV-M3-8-C M3 0.5 8 5.5 3 2.5 227 0.11 20 0.18 50.53 CAD Cart
SPV-M3-10-C M3 0.5 10 5.5 3 2.5 227 0.11 20 0.2 51.39 CAD Cart
SPV-M3-12-C M3 0.5 12 5.5 3 2.5 227 0.11 20 0.22 51.39 CAD Cart
SPV-M3-15-C M3 0.5 15 5.5 3 2.5 227 0.11 20 0.23 52.29 CAD Cart
SPV-M4-5-C M4 0.7 5 7 4 3 429 0.26 20 0.33 51.39 CAD Cart
SPV-M4-6-C M4 0.7 6 7 4 3 429 0.26 20 0.34 52.29 CAD Cart
SPV-M4-8-C M4 0.7 8 7 4 3 429 0.26 20 0.38 52.29 CAD Cart
SPV-M4-10-C M4 0.7 10 7 4 3 429 0.26 20 0.41 53.47 CAD Cart
SPV-M4-12-C M4 0.7 12 7 4 3 429 0.26 20 0.45 53.47 CAD Cart
SPV-M4-15-C M4 0.7 15 7 4 3 429 0.26 20 0.5 54.11 CAD Cart
SPV-M4-20-C M4 0.7 20 7 4 3 429 0.26 20 0.61 56.67 CAD Cart
SPV-M5-10-C M5 0.8 10 8.5 5 4 688 0.44 20 0.62 54.09 CAD Cart
SPV-M5-12-C M5 0.8 12 8.5 5 4 688 0.44 20 0.68 56.42 CAD Cart
SPV-M5-15-C M5 0.8 15 8.5 5 4 688 0.44 20 0.79 58.08 CAD Cart
SPV-M5-20-C M5 0.8 20 8.5 5 4 688 0.44 20 0.92 61.88 CAD Cart
SPV-M5-25-C M5 0.8 25 8.5 5 4 688 0.44 20 1.1 65.91 CAD Cart
SPV-M5-30-C M5 0.8 30 8.5 5 4 688 0.44 20 1.3 69.44 CAD Cart
SPV-M5-35-C M5 0.8 35 8.5 5 4 688 0.44 20 1.5 73.79 CAD Cart
SPV-M6-10-C M6 1 10 10 6 5 960 0.81 10 1.1 31.82 CAD Cart
SPV-M6-12-C M6 1 12 10 6 5 960 0.81 10 1.2 33.41 CAD Cart
SPV-M6-15-C M6 1 15 10 6 5 960 0.81 10 1.3 33.98 CAD Cart
SPV-M6-20-C M6 1 20 10 6 5 960 0.81 10 1.5 36.15 CAD Cart
SPV-M6-25-C M6 1 25 10 6 5 960 0.81 10 1.7 38.88 CAD Cart
SPV-M6-30-C M6 1 30 10 6 5 960 0.81 10 1.9 41.76 CAD Cart
SPV-M6-35-C M6 1 35 10 6 5 960 0.81 10 2.3 43.90 CAD Cart
SPV-M6-40-C M6 1 40 10 6 5 960 0.81 10 2.6 45.79 CAD Cart
SPV-M8-10-C M8 1.25 10 13 8 6 1803 1.56 10 2.4 66.19 CAD Cart
SPV-M8-12-C M8 1.25 12 13 8 6 1803 1.56 10 2.5 66.19 CAD Cart
SPV-M8-15-C M8 1.25 15 13 8 6 1803 1.56 10 2.8 66.19 CAD Cart
SPV-M8-20-C M8 1.25 20 13 8 6 1803 1.56 10 3.1 66.19 CAD Cart
SPV-M8-25-C M8 1.25 25 13 8 6 1803 1.56 10 3.5 66.19 CAD Cart
SPV-M8-30-C M8 1.25 30 13 8 6 1803 1.56 10 3.9 77.41 CAD Cart
SPV-M8-35-C M8 1.25 35 13 8 6 1803 1.56 10 4.4 77.41 CAD Cart
SPV-M8-40-C M8 1.25 40 13 8 6 1803 1.56 10 4.8 77.41 CAD Cart
SPV-M10-15-C M10 1.5 15 16 10 8 2824 3.16 10 4.7 66.19 CAD Cart
SPV-M10-20-C M10 1.5 20 16 10 8 2824 3.16 10 5.3 72.05 CAD Cart
SPV-M10-25-C M10 1.5 25 16 10 8 2824 3.16 10 5.9 78.17 CAD Cart
SPV-M10-30-C M10 1.5 30 16 10 8 2824 3.16 10 6.4 84.48 CAD Cart
SPV-M10-35-C M10 1.5 35 16 10 8 2824 3.16 10 7 90.09 CAD Cart
SPV-M10-40-C M10 1.5 40 16 10 8 2824 3.16 10 7.6 107.76 CAD Cart
SPV-M12-20-C M12 1.75 20 18 12 10 4249 5.73 10 7.4 96.26 CAD Cart
SPV-M12-25-C M12 1.75 25 18 12 10 4249 5.73 10 8.2 101.84 CAD Cart
SPV-M12-30-C M12 1.75 30 18 12 10 4249 5.73 10 9.1 107.21 CAD Cart
SPV-M12-35-C M12 1.75 35 18 12 10 4249 5.73 10 9.9 126.22 CAD Cart
SPV-M12-40-C M12 1.75 40 18 12 10 4249 5.73 10 11 137.88 CAD Cart
Part Number M (Coarse)
Nominal of Thread
Pitch L D1 L1 B Tension Rupture Load
(N)*1
Torsional Torque
(N・m)*1
Qty per Pack Mass
(g)
Price
(USD)
CAD
Download
QTY
(Pack)
SPV-M3-5-C M3 0.5 5 5.5 3 2.5 227 0.11 20 0.15 48.65 CAD Cart
SPV-M3-6-C M3 0.5 6 5.5 3 2.5 227 0.11 20 0.16 50.53 CAD Cart
SPV-M3-8-C M3 0.5 8 5.5 3 2.5 227 0.11 20 0.18 50.53 CAD Cart
SPV-M3-10-C M3 0.5 10 5.5 3 2.5 227 0.11 20 0.2 51.39 CAD Cart
SPV-M3-12-C M3 0.5 12 5.5 3 2.5 227 0.11 20 0.22 51.39 CAD Cart
SPV-M3-15-C M3 0.5 15 5.5 3 2.5 227 0.11 20 0.23 52.29 CAD Cart
SPV-M4-5-C M4 0.7 5 7 4 3 429 0.26 20 0.33 51.39 CAD Cart
SPV-M4-6-C M4 0.7 6 7 4 3 429 0.26 20 0.34 52.29 CAD Cart
SPV-M4-8-C M4 0.7 8 7 4 3 429 0.26 20 0.38 52.29 CAD Cart
SPV-M4-10-C M4 0.7 10 7 4 3 429 0.26 20 0.41 53.47 CAD Cart
SPV-M4-12-C M4 0.7 12 7 4 3 429 0.26 20 0.45 53.47 CAD Cart
SPV-M4-15-C M4 0.7 15 7 4 3 429 0.26 20 0.5 54.11 CAD Cart
SPV-M4-20-C M4 0.7 20 7 4 3 429 0.26 20 0.61 56.67 CAD Cart
SPV-M5-10-C M5 0.8 10 8.5 5 4 688 0.44 20 0.62 54.09 CAD Cart
SPV-M5-12-C M5 0.8 12 8.5 5 4 688 0.44 20 0.68 56.42 CAD Cart
SPV-M5-15-C M5 0.8 15 8.5 5 4 688 0.44 20 0.79 58.08 CAD Cart
SPV-M5-20-C M5 0.8 20 8.5 5 4 688 0.44 20 0.92 61.88 CAD Cart
SPV-M5-25-C M5 0.8 25 8.5 5 4 688 0.44 20 1.1 65.91 CAD Cart
SPV-M5-30-C M5 0.8 30 8.5 5 4 688 0.44 20 1.3 69.44 CAD Cart
SPV-M5-35-C M5 0.8 35 8.5 5 4 688 0.44 20 1.5 73.79 CAD Cart
SPV-M6-10-C M6 1 10 10 6 5 960 0.81 10 1.1 31.82 CAD Cart
SPV-M6-12-C M6 1 12 10 6 5 960 0.81 10 1.2 33.41 CAD Cart
SPV-M6-15-C M6 1 15 10 6 5 960 0.81 10 1.3 33.98 CAD Cart
SPV-M6-20-C M6 1 20 10 6 5 960 0.81 10 1.5 36.15 CAD Cart
SPV-M6-25-C M6 1 25 10 6 5 960 0.81 10 1.7 38.88 CAD Cart
SPV-M6-30-C M6 1 30 10 6 5 960 0.81 10 1.9 41.76 CAD Cart
SPV-M6-35-C M6 1 35 10 6 5 960 0.81 10 2.3 43.90 CAD Cart
SPV-M6-40-C M6 1 40 10 6 5 960 0.81 10 2.6 45.79 CAD Cart
SPV-M8-10-C M8 1.25 10 13 8 6 1803 1.56 10 2.4 66.19 CAD Cart
SPV-M8-12-C M8 1.25 12 13 8 6 1803 1.56 10 2.5 66.19 CAD Cart
SPV-M8-15-C M8 1.25 15 13 8 6 1803 1.56 10 2.8 66.19 CAD Cart
SPV-M8-20-C M8 1.25 20 13 8 6 1803 1.56 10 3.1 66.19 CAD Cart
SPV-M8-25-C M8 1.25 25 13 8 6 1803 1.56 10 3.5 66.19 CAD Cart
SPV-M8-30-C M8 1.25 30 13 8 6 1803 1.56 10 3.9 77.41 CAD Cart
SPV-M8-35-C M8 1.25 35 13 8 6 1803 1.56 10 4.4 77.41 CAD Cart
SPV-M8-40-C M8 1.25 40 13 8 6 1803 1.56 10 4.8 77.41 CAD Cart
SPV-M10-15-C M10 1.5 15 16 10 8 2824 3.16 10 4.7 66.19 CAD Cart
SPV-M10-20-C M10 1.5 20 16 10 8 2824 3.16 10 5.3 72.05 CAD Cart
SPV-M10-25-C M10 1.5 25 16 10 8 2824 3.16 10 5.9 78.17 CAD Cart
SPV-M10-30-C M10 1.5 30 16 10 8 2824 3.16 10 6.4 84.48 CAD Cart
SPV-M10-35-C M10 1.5 35 16 10 8 2824 3.16 10 7 90.09 CAD Cart
SPV-M10-40-C M10 1.5 40 16 10 8 2824 3.16 10 7.6 107.76 CAD Cart
SPV-M12-20-C M12 1.75 20 18 12 10 4249 5.73 10 7.4 96.26 CAD Cart
SPV-M12-25-C M12 1.75 25 18 12 10 4249 5.73 10 8.2 101.84 CAD Cart
SPV-M12-30-C M12 1.75 30 18 12 10 4249 5.73 10 9.1 107.21 CAD Cart
SPV-M12-35-C M12 1.75 35 18 12 10 4249 5.73 10 9.9 126.22 CAD Cart
SPV-M12-40-C M12 1.75 40 18 12 10 4249 5.73 10 11 137.88 CAD Cart
Part Number M (Coarse)
Nominal of Thread
Pitch L D1 L1 B Tension Rupture Load
(N)*1
Torsional Torque
(N・m)*1
Qty per Pack Mass
(g)
Price
(USD)
CAD
Download
QTY
(Pack)
SPV-M3-5-C M3 0.5 5 5.5 3 2.5 227 0.11 20 0.15 48.65 CAD Cart
SPV-M3-6-C M3 0.5 6 5.5 3 2.5 227 0.11 20 0.16 50.53 CAD Cart
SPV-M3-8-C M3 0.5 8 5.5 3 2.5 227 0.11 20 0.18 50.53 CAD Cart
SPV-M3-10-C M3 0.5 10 5.5 3 2.5 227 0.11 20 0.2 51.39 CAD Cart
SPV-M3-12-C M3 0.5 12 5.5 3 2.5 227 0.11 20 0.22 51.39 CAD Cart
SPV-M3-15-C M3 0.5 15 5.5 3 2.5 227 0.11 20 0.23 52.29 CAD Cart
SPV-M4-5-C M4 0.7 5 7 4 3 429 0.26 20 0.33 51.39 CAD Cart
SPV-M4-6-C M4 0.7 6 7 4 3 429 0.26 20 0.34 52.29 CAD Cart
SPV-M4-8-C M4 0.7 8 7 4 3 429 0.26 20 0.38 52.29 CAD Cart
SPV-M4-10-C M4 0.7 10 7 4 3 429 0.26 20 0.41 53.47 CAD Cart
SPV-M4-12-C M4 0.7 12 7 4 3 429 0.26 20 0.45 53.47 CAD Cart
SPV-M4-15-C M4 0.7 15 7 4 3 429 0.26 20 0.5 54.11 CAD Cart
SPV-M4-20-C M4 0.7 20 7 4 3 429 0.26 20 0.61 56.67 CAD Cart
SPV-M5-10-C M5 0.8 10 8.5 5 4 688 0.44 20 0.62 54.09 CAD Cart
SPV-M5-12-C M5 0.8 12 8.5 5 4 688 0.44 20 0.68 56.42 CAD Cart
SPV-M5-15-C M5 0.8 15 8.5 5 4 688 0.44 20 0.79 58.08 CAD Cart
SPV-M5-20-C M5 0.8 20 8.5 5 4 688 0.44 20 0.92 61.88 CAD Cart
SPV-M5-25-C M5 0.8 25 8.5 5 4 688 0.44 20 1.1 65.91 CAD Cart
SPV-M5-30-C M5 0.8 30 8.5 5 4 688 0.44 20 1.3 69.44 CAD Cart
SPV-M5-35-C M5 0.8 35 8.5 5 4 688 0.44 20 1.5 73.79 CAD Cart
SPV-M6-10-C M6 1 10 10 6 5 960 0.81 10 1.1 31.82 CAD Cart
SPV-M6-12-C M6 1 12 10 6 5 960 0.81 10 1.2 33.41 CAD Cart
SPV-M6-15-C M6 1 15 10 6 5 960 0.81 10 1.3 33.98 CAD Cart
SPV-M6-20-C M6 1 20 10 6 5 960 0.81 10 1.5 36.15 CAD Cart
SPV-M6-25-C M6 1 25 10 6 5 960 0.81 10 1.7 38.88 CAD Cart
SPV-M6-30-C M6 1 30 10 6 5 960 0.81 10 1.9 41.76 CAD Cart
SPV-M6-35-C M6 1 35 10 6 5 960 0.81 10 2.3 43.90 CAD Cart
SPV-M6-40-C M6 1 40 10 6 5 960 0.81 10 2.6 45.79 CAD Cart
SPV-M8-10-C M8 1.25 10 13 8 6 1803 1.56 10 2.4 66.19 CAD Cart
SPV-M8-12-C M8 1.25 12 13 8 6 1803 1.56 10 2.5 66.19 CAD Cart
SPV-M8-15-C M8 1.25 15 13 8 6 1803 1.56 10 2.8 66.19 CAD Cart
SPV-M8-20-C M8 1.25 20 13 8 6 1803 1.56 10 3.1 66.19 CAD Cart
SPV-M8-25-C M8 1.25 25 13 8 6 1803 1.56 10 3.5 66.19 CAD Cart
SPV-M8-30-C M8 1.25 30 13 8 6 1803 1.56 10 3.9 77.41 CAD Cart
SPV-M8-35-C M8 1.25 35 13 8 6 1803 1.56 10 4.4 77.41 CAD Cart
SPV-M8-40-C M8 1.25 40 13 8 6 1803 1.56 10 4.8 77.41 CAD Cart
SPV-M10-15-C M10 1.5 15 16 10 8 2824 3.16 10 4.7 66.19 CAD Cart
SPV-M10-20-C M10 1.5 20 16 10 8 2824 3.16 10 5.3 72.05 CAD Cart
SPV-M10-25-C M10 1.5 25 16 10 8 2824 3.16 10 5.9 78.17 CAD Cart
SPV-M10-30-C M10 1.5 30 16 10 8 2824 3.16 10 6.4 84.48 CAD Cart
SPV-M10-35-C M10 1.5 35 16 10 8 2824 3.16 10 7 90.09 CAD Cart
SPV-M10-40-C M10 1.5 40 16 10 8 2824 3.16 10 7.6 107.76 CAD Cart
SPV-M12-20-C M12 1.75 20 18 12 10 4249 5.73 10 7.4 96.26 CAD Cart
SPV-M12-25-C M12 1.75 25 18 12 10 4249 5.73 10 8.2 101.84 CAD Cart
SPV-M12-30-C M12 1.75 30 18 12 10 4249 5.73 10 9.1 107.21 CAD Cart
SPV-M12-35-C M12 1.75 35 18 12 10 4249 5.73 10 9.9 126.22 CAD Cart
SPV-M12-40-C M12 1.75 40 18 12 10 4249 5.73 10 11 137.88 CAD Cart

*1: Values in chart are for reference only. They are not guaranteed values.The recommendation torque is 50% of the torsional torque.

Related Services

Material/Finish

SPV-C
Main body PVDF (Polyvinylidene Fluoride)
(Milky White)
Heat resistance temperature*1 150℃

*1: This is the value for the plastic material. The maximum operating temperature of the product changes with performance conditions such as tightening torque.


Application

FPD production equipment / Semiconductor devices / Printed
circuit board etching devices / Metallic surface treatment
equipment and facilities / Chemical plants / Food industry
machines

Characteristics

  • PVDF has excellent chemical resistance against strong acids and organic solvents as well as halogen compounds such as hydrogen sulfide and bromine.
  • It can be used in atmospheres in which metal and PVC (polyvinyl chloride)cannot be used.
  • Max. Operating Temperature*1 (min./max.):
    -40/150°C
  • Its tensile strength equals or exceeds that of PVC, and its impact strength is 3 times that of PVC.
  • It is self-extinguishing and has excellent incombustibility.
  • The properties and precautions of plastic screws⇒Plastic Screws

Product List

Click here to see Chemical Resistance

Click here to see Special Screws