Roofing and Cladding screws and accessories
Teepee Products Ltd Telephone 0118 9757776
A leading manufacturer of the nylon Bi-hex cladding screw and home of the tek screw since 1994
www.claddingscrews.co.uk
BONDED WASHERS SPECIFICATION AND PULLOVER VALUES
Washers perform a vital role in cladding applications. It is important that washers are selected according to the requirements of the particular application. All our Bonded Washers are EPDM (Ethylene Propylene Diene Monomer) backed, to give the very best possible seal, ensuring a watertight fix over the life of the construction.
A washer is used to seal head of fastener (make watertight), as an isolator or to increase the pullover value. A washer must be used if a colour cap is to be fitted. A washer also gives a good indication of when over driving (Washer inverts).
Over the last 30 years I have never come across a situation where washers were under driven! But have seen numerous occasions when overdriving has caused major problems.
(Tom Pritchard M.D.)
Please note the invertion of washer when overdriving.
GALVANISED BONDED WASHERS ULTIMATE PULLOVER PERFORMANCE
CODE |
Nominal steel sheet thickness |
|||||
0.5mm |
0.6mm |
0.7mm |
0.9mm |
1.0mm |
1.2mm |
|
BW16-12/14GBW16-14GBW16-16G |
3.0kN |
3.8kN |
4.9kN |
6.5kN |
8.0kN |
10.2kN |
BW19-12/14GBW19-14GBW19-16G |
3.9kN |
4.3kN |
5.0kN |
6.6kN |
7.7kN |
9.4kN |
GALVANISED BONDED WASHERS
CODE |
O.D. |
METAL |
GREY EPDM |
FOR NOMINAL SCREW DIAMETER |
I.D. TOLERANCE |
BW16-12/14G |
16mm |
0.8mm±0.1 |
2.0mm±0.2 |
5.5mm (12g) |
4.5mm to 4.8mm |
BW16-14G |
16mm |
0.8mm±0.1 |
2.0mm±0.2 |
6.3mm (14g) |
5.3mm to 5.6mm |
BW16-16G |
16mm |
0.8mm±0.1 |
2.0mm±0.2 |
8.0mm (M8) |
6.7mm to 7.0mm |
BW19-12/14G |
19mm |
0.8mm±0.1 |
2.0mm±0.2 |
5.5mm (12g) |
4.5mm to 4.8mm |
BW19-14G |
19mm |
0.8mm±0.1 |
2.0mm±0.2 |
6.3mm (14g) |
5.3mm to 5.6mm |
BW19-16G |
19mm |
0.8mm±0.1 |
2.0mm±0.2 |
8.0mm (M8) |
6.7mm to 7.0mm |
304 STAINLESS STEEL BONDED WASHERS
CODE |
O.D. |
METAL |
GREY EPDM |
FOR NOMINAL SCREW DIAMETER |
I.D. TOLERANCE |
BW16-12/14SS |
16mm |
0.8mm±0.1 |
2.0mm±0.2 |
5.5mm (12g) |
4.5mm to 4.8mm |
BW16-14SS |
16mm |
0.8mm±0.1 |
2.0mm±0.2 |
6.3mm (14g) |
5.3mm to 5.6mm |
BW19-12/14SS |
19mm |
0.8mm±0.1 |
2.0mm±0.2 |
5.5mm (12g) |
4.5mm to 4.8mm |
BW19-14SS |
19mm |
0.8mm±0.1 |
2.0mm±0.2 |
6.3mm (14g) |
5.3mm to 5.6mm |
ALUMINIUM BONDED WASHERS
CODE |
O.D. |
METAL |
GREY EPDM |
FOR NOMINAL SCREW DIAMETER |
I.D. TOLERANCE |
BW29-12/14A |
29mm |
0.8mm±0.1 |
2.0mm±0.2 |
5.5mm (12g) |
4.5mm to 4.8mm |
BW29-14A |
29mm |
0.8mm±0.1 |
2.0mm±0.2 |
6.3mm (14g) |
5.3mm to 5.6mm |
