What is this stepped key insert used for?

It is designed for HVAC work such as installing and removing radiator valves, thermostats, and drain fittings.

What step sizes are included?

It features 5 step sizes: 3/8", 7/16", 1/2", 16 mm, and 21 mm.

What drive size does this tool use?

It has a standard 1/2" square drive for use with 1/2" ratchets.

What material is this stepped key made of?

It is made of durable chrome vanadium steel with a matte chrome finish.

What is the length of the tool?

The step wrench insert has a length of 88 mm.

WERA 9529 C SB step wrench insert for HVAC applications 1/2", 88 mm - 05136074001

Name: WERA 9529 C SB step wrench insert for HVAC applications 1/2", 88 mm - 05136074001
Brand: WERA
SKU: 08103823
Price: 14.8 EUR
Availability: PreOrder

Supplier number: WERA 05136074001 | EAN 4013288228390

Recommended Retail Price €33.25

14.80 tax incl.

€12.23 excl. VAT (incl. all environmental contributions)

On order: delivered from 05/11/2026

Ordered before 20:00 - delivered as of 05/11/2026
Shipping costs €11.99 VAT included | Free shipping for orders over a total amount of 125 euros
Delivery by DHL

✆ Talk to a specialist

Effortless fittings using the Wera stepped wrench

Practical benefits

Multi-step size versatility: Featuring five practical stepped dimensions, you can install and remove radiator valves, thermostats, and drain fittings smoothly.
Standard square ratchet drive: The 1/2" drive connects easily to your regular ratchets for optimal leverage and controlled turning.
Durable chrome vanadium steel: The hardened steel construction ensures you achieve long-lasting reliability during demanding plumbing and HVAC projects.

In a nutshell

The right choise for

With the Wera 9529 C sb stepped key insert, you tackle hvac installations quickly and efficiently. Instead of swapping between multiple loose tools, this compact 88 mm insert covers five essential sizes: 3/8", 7/16", 1/2", 16 mm, and 21 mm. Thanks to the standard 1/2" square drive, it connects directly to your 1/2" ratchet for optimal leverage and controlled turning in tight spots. Assemble or remove radiator valves, thermostat connections, and drain fittings smoothly without damaging internal fittings. Built from robust chrome vanadium steel with a matte chrome finish, this stepped wrench delivers dependable performance for central heating projects.

Product information FAQ

€14.80

tax incl.

Key features according to our expert

Length: 154 mm

Scope of delivery

9529 C SB 1/2" Step wrench, 88 mm

Product description

Step wrench insert (1/2") for HVAC applications: Installation and removal of radiator valves, thermostats, drain fittings, etc.

5 steps (3/8", 7/16", 1/2", 16 and 21 mm)
For 1/2" ratchets
Chrome vanadium steel

Drive

1/2"

Application

For all standard drain fittings, radiator valves, thermostats, etc.

Design

5 steps: 3/8", 7/16", 1/2", 16 and 21 mm; chrome vanadium steel, matt chrome plated

Features and benefits

The step wrench (1/2") is suitable for all standard drain fittings, radiator valves, thermostats, etc. 5 steps (3/8", 7/16", 1/2", 16 and 21 mm).

All Features

Length: 154 mm

Brand WERA
08103823
EAN 4013288228390
Supplier number WERA 05136074001

Frequently asked questions about this product

Answered by specialists

What is this stepped key insert used for?: It is designed for HVAC work such as installing and removing radiator valves, thermostats, and drain fittings.
What step sizes are included?: It features 5 step sizes: 3/8", 7/16", 1/2", 16 mm, and 21 mm.
What drive size does this tool use?: It has a standard 1/2" square drive for use with 1/2" ratchets.
What material is this stepped key made of?: It is made of durable chrome vanadium steel with a matte chrome finish.
What is the length of the tool?: The step wrench insert has a length of 88 mm.

Questions about this product?

Our product specialists are happy to help with any questions about this range. Call, email or chat with us!

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