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
BW16-12/14G
BW16-14G
BW16-16G
3.0kN
3.8kN
4.9kN
6.5kN
8.0kN
10.2kN
BW19-12/14G
BW19-14G
BW19-16G
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
3.0mm±0.2
5.5mm (12g)
4.5mm to 4.8mm
BW19-14G
19mm
0.8mm±0.1
3.0mm±0.2
6.3mm (14g)
5.3mm to 5.6mm
BW19-16G
19mm
0.8mm±0.1
3.0mm±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
3.0mm±0.2
5.5mm (12g)
4.5mm to 4.8mm
BW19-14SS
19mm
0.8mm±0.1
3.0mm±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
3.0mm±0.2
5.5mm (12g)
4.5mm to 4.8mm
BW29-14A
29mm
0.8mm±0.1
3.0mm±0.2
6.3mm (14g)
5.3mm to 5.6mm