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| SERVICE | DELIVERY PRICE | DELIVERY TIME |
|---|---|---|
| Standard Delivery | £22.95 | 7 to 10 working days |
| SERVICE | DELIVERY PRICE | DELIVERY TIME |
|---|---|---|
| Standard Delivery | £22.95 | 7 to 10 working days |
| SERVICE | DELIVERY PRICE | DELIVERY TIME |
|---|---|---|
| Standard Delivery | £4.99 | 2 to 4 working days |
| Next Day | £9.99 |
| SERVICE | DELIVERY PRICE | DELIVERY TIME |
|---|---|---|
| Standard Delivery | £22.95 | 5 to 7 working days |
Product Number: S3821
Finding a 21mm socket with a 3/8" drive that can stand up to regular professional use without rounding fasteners is a common frustration the Sealey S3821 is designed to address that directly. Part of Sealey's comprehensive Premier Hand Tools range, this standard-depth socket is cold-forged from Chrome Vanadium steel and hardened and tempered for added strength. The WallDrive® socket configuration engages the flat walls of nuts and bolts rather than their corners, providing a more secure grip and reducing the likelihood of fastener damage. The half chrome, half satin finish looks professional and the knurled ring ensures a positive grip when working with oily hands. Backed by a lifetime guarantee*, the S3821 is a dependable choice for trade and workshop environments alike.
Key Features:PartsForMachines is a premier e-commerce platform, founded in 2019 in Warwickshire, UK, specializing in aftermarket parts and services for construction, agriculture, and industrial machinery. We offer an extensive catalog of over 500,000 products. Standard delivery: 1–3 working days within UK mainland. We are proud to be an authorised distributor, giving customers extra confidence when purchasing genuine products from us. In addition, we provide a 30-day return policy for eligible items.
| Model No | S3821 |
|---|---|
| Brand | Premier |
| Depth | Standard |
| Drive | 3/8"Sq |
| Material | Chrome Vanadium |
| Nett Weight | 0.10kg |
| Size | 21mm |
| Engine Parts | Product Number | Product Name | Recommended Units | Product Price |
|---|
Standard Delivery: £4.99
Next Day Delivery Available
Delivery Estimate: 2 to 4 working days
Save Extra With 1 Offer
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| Technical Specification | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| PRODUCT NUMBER | S0576 | S0577 | S0578 | S0579 | S1221D | S0658 | 28190 | 18819 | 24230 | 49484 |
A. The S3821 is a 21mm standard-depth socket with a 3/8" square drive.
A. WallDrive® is Sealey's socket design that contacts the flat sides of a fastener rather than its corners, reducing the risk of rounding nuts and bolts under load.
A. It is cold-forged from Chrome Vanadium steel, then hardened and tempered for added strength.
A. The half chrome, half satin finish is combined with a knurled ring, providing extra grip with oily or wet hands during use.
A. Yes, the S3821 is backed by a lifetime guarantee*.
A. Yes, the S3821 is part of Sealey's Premier Hand Tools range and is described as suitable for daily professional use.
A. Yes, alternatives that perform the same function include S0576, S0577, S0578, and S0579.
A. We accept returns within 30 days of purchase for items that are unused, undamaged, and in their original packaging. Returns are available only for UK-delivered orders and must include proof of purchase. Before returning an item, please contact us at [email protected] to obtain a Return Merchandise Number (RMN). You may also be asked to share images of the product and its packaging for verification. Items that do not meet these conditions will not be accepted for return. If your return is approved, we will initiate a refund to your credit card or original method of payment. A restocking fee of up to 15% of the order value may apply to each returned item.
A. Yes - WhatsApp us on 07754 288583 with any questions about specifications, suitability, or compatibility, and we'll help you choose the right product.
A. Every product comes with a different guarantee and warranty. Warranty details are shown in the product's tech specs or datasheet where available.
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