20x36x7 mm Rotary Shaft Oil Seal NBR, TC Type Shaft Seal with Metal Insert

Product Overview

This is a small bore seal: a 20 mm shaft running inside a 36 mm housing with only 7 mm of space for the seal. Sizes of this section are common on auxiliary drives, small pumps and compact gearboxes where the housing is cast and the space around the shaft is tight.

At a glance:

20x36x7 mm | NBR (nitrile butadiene rubber) | double lip TC body with 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 short 7 mm body is the part that has to be right. If the housing recess is shallower than 7 mm the seal will not sit flush, and if the shaft has a shoulder close to the bore the lip can be damaged on assembly. Measure the recess depth before ordering, not the old seal thickness alone.

Key Features & Benefits

• Short 7 mm section: A small axial footprint suits shallow housing recesses where a deeper seal would stand proud of the casting surface.
• Metal insert in the body: The pressed insert stiffens a small diameter seal, so the outer diameter stays round when it is driven into a cast housing.
• Soft lip for a small shaft: The lip is moulded thin enough to follow a 20 mm shaft without loading it heavily, which keeps friction and lip temperature down.
• Garter spring tension: Spring loading keeps the lip in contact as the shaft surface polishes over time, so the seal does not start weeping early.
• Sensitive to bore finish: The ribbed outer diameter needs a clean, dry bore. Wiping the recess before pressing helps the seal seat square.
• Matched from measurement: Shaft 20 mm, bore 36 mm, recess 7 mm gives the full selection data, so the size can be ordered directly for a stocked size.

Dimensions & Specification

Specification	Value
Inner Diameter (ID)	20 mm
Outer Diameter (OD)	36 mm
Width / Height	7 mm
Material	NBR (nitrile butadiene rubber)
Colour	Black
Structure	Double lip (main sealing lip and dust lip), garter spring, metal insert, ribbed outer diameter
Seal Type	Rotary shaft oil seal
Marking	TC 20 36 7
Continuous Service Temperature	-30 C to +100 C (short peaks to +120 C)
Brand	VKEFOT
Origin	Xingtai, Hebei, China

Dimensions are nominal and listed as inner diameter x outer diameter x width. Check the housing recess depth as well as the bore, because a 7 mm section will not seat in a shallower recess.

Material & Construction

The lip is moulded in NBR (nitrile butadiene rubber), which resists mineral oil, grease and the additive packages found in gear and hydraulic oils. A pressed metal insert is bonded into the body to hold the shape of a small diameter seal, and a garter spring maintains lip load over the working range of -30 C to +100 C (short peaks to +120 C). Where a small drive runs hotter than that, or the oil is synthetic, the same 20 x 36 x 7 body can be supplied in FKM for duty up to about +200 C.

Quality Control and Inspection

• Incoming: compound hardness checked before release to production.
• In process: metal insert bonding, lip edge geometry, garter spring seating and rib profile on the outer diameter checked at set intervals.
• Final: dimensional check on 20 mm inner diameter, 36 mm outer diameter and 7 mm width, rubber hardness, lip edge and size marking, then packing count verification.
• Traceability: inspection results for each batch are recorded and kept; the inspection scope can be agreed before order confirmation.

Measured values are kept with the production record for the batch, so any question on a delivered carton can be traced back to the run. Inspection before dispatch can be carried out by a third party when this is agreed 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: 20 x 36 x 7 mm, or the shaft, bore and recess measurements from your assembly.
2. Quantity and destination: required quantity, destination country and port.
3. Material: NBR as standard, or FKM and HNBR for higher temperature or synthetic fluids.
4. Marking and packaging: marking requirement, carton labels and barcode data.
5. Drawing or sample: helpful where the housing recess is shallow or partly worn.
6. Working conditions: fluid, temperature and shaft speed, if known.

Frequently Asked Questions

How do I confirm this seal fits my assembly?
Check the shaft diameter of 20 mm, the housing bore of 36 mm and the recess depth against the 7 mm body, then look at the lip arrangement on the seal you removed. The recess depth is the measurement most often missed on small housings.

What are the exact dimensions of this oil seal?
20 mm inner diameter, 36 mm outer diameter and 7 mm width. Confirm the housing recess is at least 7 mm deep before installation.

What is the minimum order quantity?
The MOQ depends on whether 20x36x7 is held as a standard size or produced to order. Tell us the quantity you plan to buy and the figure is confirmed in the quotation.

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

Can you supply FKM or HNBR instead of NBR?
Yes. For a small drive that runs hotter, or for synthetic oil, this 20 x 36 x 7 size can be produced in FKM or HNBR to suit the working conditions.

Do you provide samples, and are they free?
Samples are available for evaluation. The sample and its freight are quoted per request, and the charge is normally set off against a confirmed bulk order.

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

What information do you need to quote?
The size 20 x 36 x 7 mm, quantity, destination port, material, working temperature, fluid and packaging requirement. Shaft and recess measurements from the assembly also help.

Request a Quotation

Send the size 20 x 36 x 7 mm or the shaft, bore and recess measurements, with quantity, destination and any marking requirement, and MOQ, lead time, packing and price will follow.

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