Hex Small Flange Bi-Metallic Structural Screw 20 x 1-1/4″

Bi-metallic structural screw with a Hex Small Flange head and a 5# self-drilling point, RUSPERT coated for Class 4 (AS 3566.2-2005) corrosion protection — drill, tap and fasten steel purlins and structural framing in one pass.

Point Type: 5#
Head: Hex Small Flange
Material: 304 Stainless Steel

Not sure which size, drill point or coating your steel needs? Tell us the thickness and application — we will confirm the right screw before you order.

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Specifications

Name	Size	Salt Spray
Hex Small Flange Bi-Metallic Structural Screw	5# 14-20 x 1-1/4″	Class 4

Tail Type & Size

Hex Small Flange Bi-Metallic Structural Screw

Bonded Sealing Washers

Compatible bonded sealing washers (304 or 316 stainless steel bonded with black or grey EPDM rubber) are available to match these screws. Medium sizes are normally held in stock; sizes marked * can be customized on request.

Customization available. Any material, inner diameter, outer diameter or rubber colour not shown in this table can be produced to order — send us your specification and we will quote it.

Material	Inner Dia. (mm)	10.6 mm	16 mm	19 mm	22 mm
304 + Black EPDM	5.5	10.6	16	*	*
304 + Black EPDM	6.3	10.6	16	*	*
304 + Black EPDM	8	*	*	19	*
304 + Black EPDM	9	*	*	19	*
316 + Black EPDM	6.3	10.6	*	*	*
304 + Grey EPDM	4.8	*	*	19	*
304 + Grey EPDM	5.5	*	16	*	*
304 + Grey EPDM	6.3	*	16	*	22
304 + Grey EPDM	7.7	*	16	*	*
304 + Grey EPDM	9	*	*	19	*
316 + Grey EPDM	4.8	*	*	19	*
316 + Grey EPDM	5.5	*	16	*	*
316 + Grey EPDM	6.3	*	16	19	*

Note: Numbers shown in green are medium sizes normally in stock. * marks sizes available by custom order. Other material or size combinations can be quoted on request.