52x71x8 mm Rotary Shaft Oil Seal NBR, Black Skeleton TC Type Shaft Seal

Product Overview

The 52 x 71 x 8 mm size has an unusual combination: a large shaft and bore with a short body. That shape appears where the housing wall is thin or where a retaining shoulder leaves little axial room around the shaft.

At a glance:

52x71x8 mm | NBR (nitrile butadiene rubber) | double lip skeleton TC body with garter spring and ribbed outer diameter | made in Xingtai, Hebei, China | working range -30 C to +100 C (short peaks to +120 C)

A short body on a large diameter means the outer band must hold the seal without much help from depth. The metal skeleton keeps the 71 mm outer diameter round, and the ribbed outside surface grips the bore so the part does not creep under load.

Key Features & Benefits

• Large bore, short body: Fits housings that leave only 8 mm of axial space while still sealing a 52 mm shaft.
• Skeleton keeps it round: The 71 mm outer diameter is held by a steel skeleton, so the seal presses in without losing shape on a thin housing wall.
• Ribbed outer diameter: The ribs compress into the bore and resist creeping, which matters when the body is too short to rely on friction alone.
• Spring-loaded main lip: The garter spring keeps the sealing line closed as the shaft surface wears, giving a full service interval of sealing.
• Secondary dust lip: A dust lip on the exposed face keeps abrasive dirt off the main lip, which is what protects the shaft finish.
• Selected by dimension: 52 mm shaft, 71 mm bore and 8 mm width is enough to confirm this size from stock.

Dimensions & Specification

Specification	Value
Inner Diameter (ID)	52 mm
Outer Diameter (OD)	71 mm
Width / Height	8 mm
Material	NBR (nitrile butadiene rubber)
Colour	Black
Structure	Double lip with garter spring in a metal skeleton body, ribbed outer diameter
Seal Type	Rotary shaft oil seal
Marking	TC 52 71 8
Continuous Service Temperature	-30 C to +100 C (short peaks to +120 C)
Brand	VKEFOT
Origin	Xingtai, Hebei, China

Nominal values are 52 mm inner diameter, 71 mm outer diameter and 8 mm width. Confirm the housing bore and the depth in front of any retaining shoulder before ordering.

Material & Construction

NBR (nitrile butadiene rubber) forms the sealing lip and the ribbed outer band, bonded to a metal skeleton that keeps the large outer diameter true. The compound covers mineral oil, gear oil and grease from -30 C to +100 C (short peaks to +120 C), and the garter spring maintains sealing load as the shaft wears. For sustained temperatures beyond this range, or for synthetic lubricants, the same 52 x 71 x 8 size can be produced in FKM, which takes continuous duty to about +200 C.

Quality Control and Inspection

• Incoming: compound hardness checked before release to production.
• In process: skeleton concentricity, lip trim, spring seating and rib pattern on the outer diameter checked at set intervals.
• Final: dimensional check on 52 mm inner diameter, 71 mm outer diameter and 8 mm width, hardness, lip edge, rib form 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.

The values measured on the run stay with the batch record, so a delivered carton can be traced back to its production data. Inspection by a third party before loading can be arranged 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: 52 x 71 x 8 mm, or the measurements from the seal being replaced.
2. Quantity and destination: quantity required, destination country and port.
3. Material: NBR as standard, FKM or HNBR where the duty requires it.
4. Marking and packaging: marking requirement, carton label data and barcode.
5. Drawing or sample: useful where the housing has a shoulder close to the bore.
6. Working conditions: temperature, fluid and shaft speed, if known.

Frequently Asked Questions

How do I confirm this seal fits my assembly?
Confirm the shaft is 52 mm, the bore is 71 mm and 8 mm of depth is clear in front of any shoulder, then match the lip direction with the removed seal. The shoulder clearance is the check that matters most on a short body.

What are the exact dimensions of this oil seal?
52 mm inner diameter, 71 mm outer diameter and 8 mm width. Check that no retaining ring or shoulder stands inside the 8 mm depth, or the seal will not sit flush.

What is the minimum order quantity?
It depends on whether the 52x71x8 size is a stock item or produced for the order. Tell us the quantity and the MOQ is confirmed with the price.

What is the lead time, and can you ship by sea or air?
Standard sizes normally ship within 7 to 15 working days of order confirmation. Both sea and air freight are arranged, quoted for your port.

Can you supply FKM or HNBR instead of NBR?
Yes. This 52 x 71 x 8 size can be produced in FKM or HNBR where temperature or fluid conditions go past the NBR range. Confirm the compound at the enquiry stage.

Do you provide samples, and are they free?
Samples can be provided for trial fitting. The sample and its freight are quoted per request, and on a confirmed bulk order the sample charge is normally deducted from the order value.

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

What information do you need to quote?
Size 52 x 71 x 8 mm, quantity, destination port, material, working temperature, fluid, packaging requirement and preferred Incoterm.

Request a Quotation

Send the size 52 x 71 x 8 mm or the measurements from your assembly, with quantity, destination and any logo or packing requirement, and MOQ, lead time, packing and price will be returned.

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