Which spark plug size is this socket designed for?

This socket is designed for spark plugs with a 21 mm hex size.

What drive size does this spark plug socket have?

It features a standard 3/8" square drive for use with 3/8" ratchets and extensions.

What is the overall length of the socket?

The total length is 90 mm, providing reach for recessed spark plugs.

Does this socket include a universal joint?

No, this is a rigid, straight socket without a universal joint.

Does this socket retain the spark plug during removal?

Yes, it is equipped with a spark plug retainer system to securely hold and lift the plug.

FACOM B.J21A1 square cap 3/8" for spark plugs 21 mm, 90 mm

Name: FACOM B.J21A1 square cap 3/8" for spark plugs 21 mm, 90 mm
Brand: FACOM
SKU: 41299735
Price: 29.8 EUR
Availability: PreOrder

Supplier number: FACOM B.J21A1 | EAN 3148510136714

Recommended Retail Price €42.65

29.80 tax incl.

€24.63 excl. VAT (incl. all environmental contributions)

On order: delivered from 12/10/2026

Ordered before 20:00 - delivered as of 12/10/2026
Shipping costs €11.99 VAT included | Free shipping for orders over a total amount of 125 euros
Delivery by DHL
Lifetime warranty on Facom? Or limited in time? Read more about it here.

✆ Talk to a specialist

Reliable spark plug service with Facom

Practical benefits

Secure grip on plugs: You install and remove 21 mm spark plugs smoothly without risking damage to the ceramic insulator.
Access to deep recesses: With a total length of 90 mm, you easily reach spark plugs positioned deep inside engine wells.
Standard square drive fit: The 3/8" internal square connects firmly with standard ratchets and extensions for steady torque application.

In a nutshell

The right choise for

With the Facom B.J21A1 spark plug socket, you remove and install 21 mm spark plugs smoothly and securely. Thanks to its 90 mm length, you easily access deeply recessed plugs located inside cylinder head wells. The built-in retaining system firmly holds the spark plug, allowing you to lift and place it safely without risking damage to the delicate ceramic insulator. Its standard 3/8" internal square drive fits your 3/8" ratchets and extensions perfectly, delivering reliable torque transfer for maintenance on automotive engines, lawn mowers, and small power equipment.

Product information FAQ

€29.80

tax incl.

Key features according to our expert

Width across flats: 21 mm
Connection size: 3/8"
Connection profile: Internal square
Length: 90 mm
With cardan joint: No
Supplier warranty: FACOM - Lifetime (E)

Product description

Square sockets 3/8" for 16, 18 and 21 mm spark plugs

Features

Sockets with a holder system for the spark plug.

All Features

Width across flats: 21 mm
Connection size: 3/8"
Connection profile: Internal square
Length: 90 mm
With cardan joint: No
Supplier warranty: FACOM - Lifetime (E)
Warranty: Lifetime (E)

Brand FACOM
41299735
EAN 3148510136714
Supplier number FACOM B.J21A1
Warranty Lifetime warranty on Facom? Or limited in time? Read more about it here.

Frequently asked questions about this product

Answered by specialists

Which spark plug size is this socket designed for?: This socket is designed for spark plugs with a 21 mm hex size.
What drive size does this spark plug socket have?: It features a standard 3/8" square drive for use with 3/8" ratchets and extensions.
What is the overall length of the socket?: The total length is 90 mm, providing reach for recessed spark plugs.
Does this socket include a universal joint?: No, this is a rigid, straight socket without a universal joint.
Does this socket retain the spark plug during removal?: Yes, it is equipped with a spark plug retainer system to securely hold and lift the plug.