73.5x89x8.5 mm HTC Rotary Shaft Oil Seal NBR, Oil Return Line Rubber-Covered Seal

Product Overview

A 73.5 x 89 x 8.5 mm HTC oil seal is a compact radial shaft seal for a 73.5 mm shaft in an 89 mm bore. The lip is moulded with an oil return line, a shallow helical groove that carries oil back toward the sump as the shaft turns, which holds back weeping where the shaft turns quickly. The outer diameter is rubber covered and the body is 8.5 mm wide.

At a glance:

73.5x89x8.5 mm | NBR (nitrile butadiene rubber) | HTC body, oil return line on the lip, rubber-covered outer diameter, single lip with garter spring | made in Xingtai, Hebei, China | working range -30 C to +100 C (short peaks to +120 C)

VKEFOT makes this size in Xingtai, Hebei, China for workshops and distributors that buy by measurement. Because the oil return line is directional, the rotation direction of the shaft belongs in the enquiry together with the shaft diameter, the bore and the seat depth.

Key Features & Benefits

• Oil return line on the lip: The moulded helical groove feeds oil back to the sump as the shaft turns, so the seal resists the fine weeping that shows up on faster turning shafts.
• Compact 8.5 mm body: The narrow profile fits housings with little axial space, which is common on small gear cases and shaft ends where a wider seal will not seat.
• Rubber-covered outer diameter: The rubber jacket presses into the bore and covers light surface marks, so a housing that has already carried a seal can usually be reused.
• Spring-loaded lip: A garter spring holds the lip against the shaft as the rubber takes a set, so sealing force does not drop away after the first running hours.
• NBR for ordinary oil duty: The nitrile element handles mineral and gear oils from -30 C to +100 C, with short peaks to +120 C, and keeps its elasticity in the cold.
• Matched to a measured shaft: The seal is chosen from shaft diameter, bore and depth, so a stocked size covers the position from stock.

Dimensions & Specification

Specification	Value
Inner Diameter (ID)	73.5 mm
Outer Diameter (OD)	89 mm
Width / Height	8.5 mm
Material	NBR (nitrile butadiene rubber)
Colour	Black
Structure	Single lip, garter spring, moulded oil return line on the lip, rubber-covered outer diameter, rotation direction sensitive
Seal Type	Rotary shaft 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 written as inner diameter x outer diameter x width. The oil return line works in one direction of rotation, so confirm the turning direction of the shaft along with the three measurements before ordering.

Material & Construction

The sealing element is moulded from NBR (nitrile butadiene rubber), bonded to a metal insert and covered with a rubber jacket on the outer diameter. NBR covers mineral oil, gear oil and grease from -30 C to +100 C, with short peaks to +120 C, and tolerates the small shaft runout found on used equipment. The lip carries a moulded oil return line and is held on the shaft by a garter spring. For hotter oil or synthetic lubricant the same body can be quoted in FKM (fluoroelastomer), which holds continuous duty to about +200 C.

Quality Control and Inspection

• Incoming: compound hardness checked before release to production.
• In process: insert concentricity, lip geometry, oil return line form and direction, spring seating and jacket thickness checked at set intervals.
• Final: dimensional check on inner diameter, outer diameter and width, rubber hardness, direction check on the return line, lip edge inspection 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.

Batch inspection records are kept and can be traced back from the delivered shipment. Third-party inspection can be arranged before shipment when it is stated in the enquiry.

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: 73.5 x 89 x 8.5 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 where oil temperature or lubricant type demands it.
4. Packaging requirement: carton marks, label data and barcode requirement.
5. Sample photo or drawing: where the seal is matched from a worn original.
6. Operating conditions: shaft rotation direction, oil temperature, lubricant type and shaft speed, if known.

Frequently Asked Questions

How do I confirm this seal fits my assembly?
Measure the shaft diameter, the housing bore and the seat depth, then compare the lip with the seal you removed. On this part also confirm the direction the shaft turns, because the oil return line is made for one direction only.

What are the exact dimensions of this oil seal?
73.5 mm inner diameter, 89 mm outer diameter and 8.5 mm width. Check these against your own sample or drawing, since the housing depth and shoulder position vary between assemblies.

What is the minimum order quantity?
MOQ depends on the size and on whether it is a stocked standard or produced to order. Tell us your target quantity and the MOQ and price breaks are confirmed in the quotation.

What is the lead time, and can you ship by sea or air?
Orders are normally produced and packed within 7 to 15 working days of confirmation. Sea and air shipments are both arranged, with freight and transit time quoted for your destination.

Can you supply FKM or HNBR instead of NBR?
Yes. FKM or HNBR can be produced in the same geometry where continuous temperature or the lubricant exceeds the NBR range. Confirm the compound when you send the enquiry.

Do you provide samples, and are they free?
Evaluation samples can be supplied. Sample and freight costs are quoted per request, and on a confirmed bulk order the sample charge is normally credited against the order value.

Does the helical return groove require a specific rotation direction?
Yes. The return groove is moulded for one direction of rotation, so state the shaft turning direction with the order. Fitted the other way round, the groove feeds oil outward and leakage increases.

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

Request a Quotation

Send the size or the number you are replacing, the shaft rotation direction, the quantity and the destination port, and we will come back with MOQ, lead time, packing data and price.

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