72x122x11/23.5 mm Differential Oil Seal NBR, Rubber-Covered Stepped Seal for Bus Differentials

Product Overview

A 72 x 122 x 11 / 23.5 mm differential oil seal sits at the pinion or output of a bus or truck axle, holding gear oil in the differential and keeping road dirt out. This one is a stepped design: the 11 mm section carries the lip and the 23.5 mm overall body fills the housing bore, with a nitrile lip loaded by a garter spring.

At a glance:

72x122x11/23.5 mm | NBR (nitrile butadiene rubber) | single lip with garter spring, rubber-covered stepped body | made in Xingtai, Hebei, China | working range -30 C to +100 C (short peaks to +120 C)

VKEFOT produces this size in Xingtai, Hebei, China for fleets and axle workshops that buy by dimension. Measure the 72 mm shaft, the 122 mm bore and the housing depth, especially the 23.5 mm overall body, against your own unit before releasing an order.

Key Features & Benefits

• Stepped body: The 23.5 mm overall body fills a deep housing bore while the 11 mm section carries the lip, so the seal seats to depth and runs true on the pinion shaft.
• Nitrile lip for gear oil: NBR resists the gear oil used in bus and truck differentials and stays flexible down to about -30 C.
• Garter spring: The spring keeps the lip pressed to the shaft, so sealing does not drop off as the lip beds in or wears.
• Built for axle duty: The body and case are sized for the load and shaft runout found at a differential output, where a thin general-purpose seal would soon weep.
• Rubber-covered outside: The rubber outer diameter grips and seals the bore, which suits large cast axle housings that are hard to finish to a fine tolerance.
• Matched by measurement: Shaft diameter, bore and housing depth set the fit, so a stocked size can replace a worn seal from stock.

Dimensions & Specification

Specification	Value
Inner Diameter (ID)	72 mm
Outer Diameter (OD)	122 mm
Width / Height	11 mm / 23.5 mm
Material	NBR (nitrile butadiene rubber)
Colour	Brown
Structure	Single lip, garter spring, rubber-covered outer diameter, stepped body (the second width value is the overall width)
Seal Type	Differential oil seal
Marking	VKEFOT
Continuous Service Temperature	-30 C to +100 C (short peaks to +120 C)
Brand	VKEFOT
Origin	Xingtai, Hebei, China

Dimensions are nominal production values measured as inner diameter x outer diameter x width; the 11 mm / 23.5 mm values are the lip section and the overall body width. Confirm them against your own sample or a measured shaft and housing bore before ordering.

Material & Construction

The lip is NBR (nitrile butadiene rubber), the standard lip material for gear oil in axle service, moulded to a metal insert with a rubber outer diameter. NBR covers -30 C to +100 C (short peaks to +120 C) and tolerates a shaft that is slightly out of round. The lip is backed by a garter spring and the stepped body fills the differential bore. Where axle temperatures run higher, or the oil is a synthetic type, the same stepped geometry can be quoted in FKM (fluoroelastomer), good for continuous duty to about +200 C.

Quality Control and Inspection

• Incoming: compound hardness checked before release to production.
• In process: lip geometry, spring seating, step height, rubber-to-insert bond and bore grip diameter checked at set intervals.
• Final: dimensional check on inner diameter, outer diameter, lip section and overall width, hardness, visual inspection of the lip edge and marking, then packing count verification.
• Traceability: inspection results for each batch are recorded and kept; the inspection scope can be agreed before order confirmation.

Buyers can arrange third-party inspection before shipment; state the requirement in the enquiry so it can be built into the quotation.

Customization and OEM Service

packaging and logo available upon request

Packaging, Carton and Delivery

Standard packing is individual polybag, inner carton, then export carton. Carton marks, labels and barcodes are printed to buyer specification.

Lead time for standard sizes is typically 7 to 15 working days after order confirmation, and longer for sizes that are not held as standard stock. Minimum order quantity depends on whether the size is a stocked standard or made to order. Pricing, MOQ, freight and trade terms are confirmed in the written quotation. Send an RFQ with quantity and destination port.

How to Order

The more of this you include, the faster and more accurate the quotation:

1. Size or OE number: 72 x 122 x 11 / 23.5 mm, or the number stamped on your current seal.
2. Quantity and destination: required quantity, destination country and port.
3. Material requirement: NBR as standard, or FKM for higher axle temperature or synthetic gear oil.
4. Packaging requirement: carton marks, label data and barcode requirement.
5. Sample photo or drawing: where the part is matched from a worn original.
6. Operating conditions: oil type, working temperature, shaft speed and shaft runout, if known.

Frequently Asked Questions

How do I confirm this seal fits my assembly?
Check the 72 mm pinion or output shaft, the 122 mm bore and the housing depth against the seal being replaced, and confirm the stepped body: the 23.5 mm overall width has to match the bore depth, not only the 11 mm lip section.

What are the exact dimensions of this oil seal?
72 mm inner diameter, 122 mm outer diameter, an 11 mm lip section and a 23.5 mm overall body width. Confirm against your own sample or drawing, because the overall width sets the seating depth.

What is the minimum order quantity?
MOQ depends on whether this size is held in stock or produced to order. Tell us the quantity you need and we will confirm the MOQ together with tiered pricing.

What is the lead time, and can you ship by sea or air?
Standard sizes normally ship within 7 to 15 working days after order confirmation. Both sea and air freight are arranged, with transit time and cost confirmed per destination.

Can you supply FKM or HNBR instead of NBR?
Yes. The same stepped geometry can be produced in FKM (fluoroelastomer) or HNBR where axle temperature or the gear oil type exceeds the NBR range. Confirm the compound when you enquire.

Do you provide samples, and are they free?
Samples for evaluation can be arranged. Sample cost and freight are quoted per request, and on a confirmed bulk order the sample charge is normally set off against the order value.

Can you produce our packaging and logo?
packaging and logo available upon request.

What information do you need to quote?
The size or the OE number you are replacing, quantity, material, oil type and working temperature, packaging and marking requirement, destination port and preferred Incoterm. A drawing or a sample gives the most accurate result.

Request a Quotation

Send the 72 x 122 x 11 / 23.5 mm size (or the OE number you are replacing), quantity, destination and any branding requirement, and we will reply with MOQ, lead time, packing details and pricing.

VKEFOT Seals: oil seals, O-rings and custom rubber parts. Xingtai, Hebei, China.