NTI LIP SEAL DESIGNS

The selection of the proper lip seal for a given sealing application is governed by the operating conditions under which the seal must function.

To assist you in this selection, the following explains the conditions and limitations for which NTI seals are designed, in both metric and inch series.

GROUP A SHAFT SEALS - One of the most popular designs, the seal O.D. and the housing bore are press fitted. The sealing function is accomplished by the sliding surface contact of the seal lip to the shaft. A close-coiled helical spring is used.
	S	SX1	T	TX3	TX4	TX6	D	V	K
B	SB	SBX1	TB	TBX3	TBX4	TBX6	DB	VB	KB	This is one of the most popular designs. The outer metal case is bonded to the seal circumference
C	SC	SCX1	TC	TCX3	TCX4	TCX6	DC	VC	KC	Has inner metal components. One of the better known types, this type seal is rust-proof and very suitable for pressing into light alloy housings
A	SA	SAX1	TA	TAX3			DA	VA		These are assembled type and especially used for large sized applications. For small and medium size applications, use the B or C series.
AX2	SAX2		TAX2	TAX32						Semi-assembled type. It is intended for use with special packing materials or heavy-duty outer cases as necessary.
CX5	SCX5		TCX5							To simplify the installation and removal procedure, the inner metal case of the C series were redesigned into special forms.
	S-types are the most popular designs. These are used for sealing a single media in one direction. It consists of two sealing elements facing in the same direction; the inner lip sealing of a heavy lubricant and the other element are free to function normally	Incorporates auxiliary supports to prevent lip base deformation due to high pressure	The T-series are intended to seal fluid in and keep dirt out. They can be used in conjunction with V-types when used in severe operating conditions.	This is basically a main lip and an auxiliary lip facing the same direction. The sealing characteristics are similar to the T-series.	This is a special lip series having one main lip and two auxiliary lips designed for smaller reciprocating shafts. Withstands rated pressure without difficulty.	This is a main lip and several auxiliary lips, and is used when the external conditions require protection against dirt, grit, water, or wet foreign matter.	Type D is especially designed for the separation of two different fluids. It consists of two S type seals facing in opposite directions for separating the two fluids.	This is a non-spring loaded type. It is used to seal a media in one direction by means of the elasticity of rubber itself, if the sealing conditions are not severe. Combinations with other types are available as required.	An auxiliary lip is added to a V-type. It is intended to seal a heavy lubricant like grease in and keep out dirt.

GROUP B SHAFT SEALS NTI oils seals are press fitted onto a shaft, and the lip and housing bore have sliding surface contact. These are sued only for specific applications where shaft seals are not easily installed. Coiled springs are used on this type.
S	T
OB	OTB	This is one of the most popular designs. The outer metal case is bonded to the seal circumference
OC	OTC	Has inner metal components. One of the better known types, this type seal is rust-proof and very suitable for pressing into light alloy housings
OA		These are assembled type and especially used for large sized applications. For small and medium size applications, use the B or C series.
The S series is used alone in applications where the media to be sealed exists in one direction.	Combinations of S types with auxiliary lips. This is suitable for excluding dirt and preventing lubricant leakage.