Top 8 21mm Socket 3/8 Drive – Star Drive Sockets

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1. Craftsman

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Metric, 3/8-Inch Drive, 6-Point CMMT43584, 21mm, CRAFTSMAN Shallow Socket

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Craftsman #ad - Increased torque: metric Sockets Feature 6 Point Socket with Fastener. Corrosion resistance: The Shallow Socket Has Full Polish Chrome Finish. Full lifetime warranty, refer to "Warranty & Support" section below for full details. Quick size identification: Large Markings. Meets or exceeds ASME Specifications.
BrandCraftsman #ad
ManufacturerCRAFTSMAN #ad
Part NumberCMMT43584
ModelCMMT43584

2. Craftsman

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CRAFTSMAN Deep Socket, 6-Point CMMT99144, 21mm, Metric, 3/8-Inch Drive

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Craftsman #ad - Meets or exceeds ASME Specifications. Quick size identification: Large Markings. Full lifetime warranty, refer to "Warranty & Support" section below for full details. Increased torque: 6-point metric socket comes with fastener. Corrosion resistance: Deep socket comes with full polish chrome finish. Increased accessibility: Deep socket.
BrandCraftsman #ad
ManufacturerCRAFTSMAN #ad
Part NumberCMMT99144
ModelCMMT99144

3. Sunex Tools

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Sunex 321md 3/8-Inch Drive 21-Mm Deep Impact Socket

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Sunex Tools #ad - The design drives the side of the fastener instead of the corner. 3/8-inch drive. Forged from the finest chrome molybdenum alloy steel-the best choice for strength and durability. Radius corner design - to extend the life of fasteners. 21mm deep impact socket.
BrandSunex Tools #ad
ManufacturerSunex International #ad
Height2.5 Inches
Length0.9 Inches
Weight0.38 Pounds
Width0.9 Inches
Part Number321MD
Model321MD

4. Sunex Tools

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Sunex 321m 3/8-Inch Drive 21-Mm Impact Socket

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Sunex Tools #ad - Radius corner design - to extend the life of fasteners. 3/8-inch drive. The design drives the side of the fastener instead of the corner. Forged from the finest chrome molybdenum alloy steel-the best choice for strength and durability. 21mm impact socket.
BrandSunex Tools #ad
ManufacturerSunex International #ad
Height1.2 Inches
Length0.9 Inches
Weight0.03 Pounds
Width0.9 Inches
Part Number321M
Model321M

5. TEKTON

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TEKTON 3/8 Inch Drive x 21 mm Deep 6-Point Socket | SHD13121

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TEKTON #ad - 6-point socket opening provides an ideal, exact fit for hex-shaped fastener heads. Beveled inner rim of the socket opening helps guide it smoothly onto fasteners.

Polished, chrome-plated finish easily wipes clean and is highly resistant to corrosion. Extra-large die-stamped size markings are easy to read and can’t wear off. Four detent grooves provide a secure connection with the drive tool. Overall socket length: 2. 49 in. Socket end diameter: 1. 11 in. Drive end Diameter: 1. 11 in. Socket well Depth: 099 in. Deep-length sockets reach into wells and accommodate the excess threads of longer shafts. Socket geometry is designed to apply force to flat sides of fasteners and not the corners, preventing round-off.
BrandTEKTON #ad
ManufacturerTEKTON #ad
Height1.2 Inches
Length2.5 Inches
Weight0.4 Pounds
Width1.2 Inches
Part NumberSHD13121
ModelSHD13121
WarrantyNo time limits, no receipts: tekton.com/tool-help

6. Jetech

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Heat-Treated Chrome Molybdenum Alloy Steel, Metric, Jetech 3/8-Inch Drive 21mm Deep Impact Socket with 6-Point Design

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Jetech #ad - Radius corner design - the lifespan of both the fastener and socket will be greatly prolonged with the force distributed to the inwall. Cr-mo alloy steel - cr-mo deep impact socket features with added strength, higher working temperatures and corrosion resistance.

Black phosphating - A fine and dense coating brings more corrosion and wear resistance for longtime use. It's much stronger to stand greater impact force than chrome vanadium ones. Cold forging & heat treatment - Cold forging and heat treatment greatly improve the performance of the socket with enhanced hardness, increased wear-resistance and lifespan. Extra depth - provide more space to accommodate longer bolts and wider applications to facilitate your work.
BrandJetech #ad
ManufacturerJetech #ad
Part NumberFK3ov8-D21

7. TEKTON

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TEKTON 3/8 Inch Drive x 21 mm Deep 12-Point Socket | SHD13321

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TEKTON #ad - Extra-large die-stamped size markings are easy to read and can’t wear off. Overall socket length: 2. 49 in. Drive end diameter: 1. 11 in. Socket end Diameter: 1.

11 in. Socket well Depth: 099 in. Deep-length sockets reach into wells and accommodate the excess threads of longer shafts. Polished, chrome-plated finish easily wipes clean and is highly resistant to corrosion. Beveled inner rim of the socket opening helps guide it smoothly onto fasteners. Four detent grooves provide a secure connection with the drive tool. Socket geometry is designed to apply force to flat sides of fasteners and not the corners, preventing round-off. 12-point opening fits double hex 12-sided, hex, and square-shaped fasteners.
BrandTEKTON #ad
ManufacturerTEKTON #ad
Height1.2 Inches
Length2.5 Inches
Width1.2 Inches
Part NumberSHD13321
ModelSHD13321
WarrantyNo time limits, no receipts: tekton.com/tool-help

8. Performance Tool

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Performance Tool W38221 6-Point Socket, 21mm, 3/8" Drive

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Performance Tool #ad - Polished nickel chrome plated finish resists corrosion. Recessed edges. Socket openings are designed to reduce fastener rounding. Chrome vanadium alloy steel construction for strength and durability. Large stamping for quick identification.
BrandPerformance Tool #ad
ManufacturerWilmar #ad
Height0.9 Inches
Length3.6 Inches
Weight0.02 Pounds
Width1.6 Inches
Part NumberW38221
ModelW38221
WarrantyLifetime