50x72x8 mm Rotary Shaft Oil Seal NBR, Brown TC Type Shaft Seal with Metal Insert

Product Overview

A 50 mm shaft, a 72 mm bore and an 8 mm body: a mid range size used on gearbox shafts, pump drives and hub assemblies. The brown compound is the standard NBR grade, and the moulded marking on the face shows the type and dimensions.

At a glance:

50x72x8 mm | NBR (nitrile butadiene rubber) | double lip TC body with bonded metal insert, garter spring and ribbed outer diameter | made in Xingtai, Hebei, China | working range -30 C to +100 C (short peaks to +120 C)

The outer surface is ribbed rubber over a metal insert, so the seal holds in the bore without turning. Because the body is only 8 mm tall, the bore must be clean and the seal must be pressed in squarely; a cocked seal on a short body will leak at one point of the lip.

Key Features & Benefits

• Even press fit: The bonded insert holds the outer diameter round, so the 8 mm body presses in square and the lip meets the shaft evenly.
• Ribbed outer diameter: Moulded ribs grip the bore and stop the seal rotating, which is what keeps a short body located under load.
• Main and dust lips: The spring-loaded lip seals the oil while the dust lip catches grit from outside, protecting the shaft surface the lip runs on.
• NBR for common fluids: Mineral oil, gear oil and grease are all within range, so this size suits workshops that work on mixed equipment.
• Brown compound marking: The face is moulded with the type and size, so a used seal can be identified from the part itself when no records exist.
• Sized from the machine: A 50 mm shaft and a 72 mm housing bore identify the part without reference to any other number.

Dimensions & Specification

Specification	Value
Inner Diameter (ID)	50 mm
Outer Diameter (OD)	72 mm
Width / Height	8 mm
Material	NBR (nitrile butadiene rubber)
Colour	Brown
Structure	Double lip with garter spring over a bonded metal insert, ribbed outer diameter
Seal Type	Rotary shaft oil seal
Marking	TC 50 72 8
Continuous Service Temperature	-30 C to +100 C (short peaks to +120 C)
Brand	VKEFOT
Origin	Xingtai, Hebei, China

Dimensions are nominal: 50 mm inner diameter, 72 mm outer diameter, 8 mm width. A short body depends on a true bore, so measure the housing bore and check it for scores before ordering.

Material & Construction

The lip is moulded in NBR (nitrile butadiene rubber) and bonded to a metal insert that keeps the short body rigid. NBR is stable in mineral oil, gear oil and grease and works between -30 C and +100 C (short peaks to +120 C), while the garter spring keeps the lip pressed to the shaft through the wear period. Where a shaft runs continuously above that temperature range or the lubricant is synthetic, this 50 x 72 x 8 size can be quoted in FKM, which holds continuous duty to about +200 C.

Quality Control and Inspection

• Incoming: compound hardness checked before release to production.
• In process: insert to rubber bonding, lip contact width, garter spring seating and outer rib profile checked at set intervals.
• Final: dimensional check on 50 mm inner diameter, 72 mm outer diameter and 8 mm width, hardness, lip edge and moulded 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 measurements are retained with the shipment record so a query on delivered goods can be answered with real production figures. A nominated third-party inspection before dispatch can be added when it is requested 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: 50 x 72 x 8 mm, or the measurements from the removed part.
2. Quantity and destination: quantity, destination country and discharge port.
3. Material: NBR standard, with FKM or HNBR available for higher temperature or synthetic fluids.
4. Marking and packaging: marking text, carton label data and barcode format.
5. Drawing or sample: recommended where the housing bore has been in service for a long period.
6. Working conditions: oil or grease type, temperature and shaft speed.

Frequently Asked Questions

How do I confirm this seal fits my assembly?
Verify the shaft is 50 mm, the housing bore is 72 mm and the recess takes the 8 mm body, then check the lip orientation against the seal you removed. A short body will leak if it goes in cocked, so the bore also needs to be clean.

What are the exact dimensions of this oil seal?
50 mm inner diameter, 72 mm outer diameter and 8 mm width. Because the section is short, confirm the recess depth and that nothing else sits in the bore.

What is the minimum order quantity?
It depends on whether the 50x72x8 size is held in stock or produced to order. Give us your required quantity and the MOQ is confirmed with the price.

What is the lead time, and can you ship by sea or air?
Standard sizes are normally dispatched within 7 to 15 working days after order confirmation. Sea and air options are both available and quoted for your destination.

Can you supply FKM or HNBR instead of NBR?
Yes. FKM or HNBR can be produced in this 50 x 72 x 8 size for higher temperature or aggressive fluids. State the temperature and the oil used.

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

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

What information do you need to quote?
Size 50 x 72 x 8 mm, quantity, destination port, material, working temperature, fluid type, packaging requirement and your preferred Incoterm.

Request a Quotation

Send the size 50 x 72 x 8 mm or the measurements from your assembly, with quantity, destination and branding requirement, and MOQ, lead time, packing and price will come back.

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