Cross-over Subs

1.Model:79.4--279.4 Size 79.4---279.4

2.Products description

cross-over subs are made from 4145H alloy steel, which are fully heat-treated to drill collar specifications. All connections are protected by a phosphated surface coating to minimize galling on initial make-up.
A: Straight OD Subs
B: Reduced Section Subs
C: Left Hand Subs

3.Mechanical Properties of SFMC Kellys

Mechanical Properties of Cross-over Subs

OD Range		Yield Strength MPa	Tensile Strength MPa	Elongation %	Hardness Brinell HB	Impact AKV J
mm	in
79.4~196.4	31/8~73/4	>=760	>=965	>=13	>=285	>=54
203.2~279.4	8~11	>=690	>=930		>=277

4.Usage

It acts as connecting and change-over, deliver torque function in different types of drill tools.

Cross-over Subs

Products list :

Contact us :