Top 9 21mm Deep Socket 3/8 Drive – Star Drive Sockets

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1. Craftsman

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

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

2. Sunex Tools

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

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Sunex Tools #ad - 3/8-inch drive. Radius corner design - to extend the life of fasteners. 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 deep impact socket.
BrandSunex Tools #ad
ManufacturerSunex International #ad
Height2.5 Inches
Length0.9 Inches
Weight0.38 Pounds
Width0.9 Inches
Part Number321MD
Model321MD

3. TEKTON

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

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TEKTON #ad - Socket geometry is designed to apply force to flat sides of fasteners and not the corners, preventing round-off. Overall socket length: 2. 49 in.

Drive end diameter: 1. 11 in. Socket end Diameter: 1. 11 in. Socket well Depth: 099 in. Beveled inner rim of the socket opening helps guide it smoothly onto fasteners. Deep-length sockets reach into wells and accommodate the excess threads of longer shafts. Four detent grooves provide a secure connection with the drive tool. Extra-large die-stamped size markings are easy to read and can’t wear off. 6-point socket opening provides an ideal, exact fit for hex-shaped fastener heads. Polished, chrome-plated finish easily wipes clean and is highly resistant to corrosion.
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

4. GEARWRENCH

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84343N, GEARWRENCH 3/8" Drive 6 Pt. Deep Impact Socket, 21mm

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GEARWRENCH #ad - Made in China. Color: Black. Package weight : 044 pounds. Chrome molybdenum alloy steel CR-MO for exceptional strength and durability.
BrandGEARWRENCH #ad
ManufacturerApex Tool Group #ad
Height1.18 Inches
Length2.48 Inches
Weight0.43 Pounds
Width1.18 Inches
Part Number84343N
Model84343N

5. Williams

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21mm, Williams 12M-621 3/8-Inch Drive Deep Impact Socket 6 Point

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Williams #ad - Suitable for use with pneumatic and electric impact wrenches. Designed for maximum engagement on 6 point fasteners. Supertorque lobular openings for greater turning power without deforming the fastener. Specially heat treated for impact use to provide long life, safety, and durability.
BrandWilliams #ad
ManufacturerJH Williams Tool Group #ad
Height1.14 Inches
Length2.64 Inches
Weight0.5 Pounds
Width1.14 Inches
Part Number12M-621
Model12M-621

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. Extra depth - provide more space to accommodate longer bolts and wider applications to facilitate your work.

Black phosphating - A fine and dense coating brings more corrosion and wear resistance for longtime use. Cr-mo alloy steel - cr-mo deep impact socket features with added strength, higher working temperatures and corrosion resistance. 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.
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 - Deep-length sockets reach into wells and accommodate the excess threads of longer shafts. 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. Polished, chrome-plated finish easily wipes clean and is highly resistant to corrosion. Overall socket length: 2. 49 in. Socket end diameter: 1. 11 in. Drive end Diameter: 1. 11 in. Socket well Depth: 099 in. Extra-large die-stamped size markings are easy to read and can’t wear 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. Capri Tools

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Capri Tools 3/8 in. Drive 21 mm Semi-Deep Impact Socket

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Capri Tools #ad - Expertly coated with manganese phosphate, the preferred coating in military and aerospace; it offers superior protection and corrosion resistance compared to black oxide coating on other impact sockets.

Drive, 21 mm size socket. Single semi-deep length, 3/8 in. Trusted by professionals, the Capri Tools high performance sockets are what you need for the job at hand. 6-point wavedrive design grips fasteners more tightly than traditional design, preventing fastener rounding and giving you more leverage. Premium chrome molybdenum steel tempered with our proprietary heat treatment process to withstand more torque from power tools.
BrandCapri Tools #ad
ManufacturerCapri Tools #ad
Height1.25 Inches
Length1.8 Inches
Weight0.3 Pounds
Width1.25 Inches
Part NumberCP53121
ModelCP53121
WarrantyLifetime Warranty

9. TEKTON

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TEKTON 3/8 Inch Drive x 21 mm Deep 6-Point Impact Socket | SID13121

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TEKTON #ad - Size is marked both with a high-visibility laser marking and a permanent stamped marking that won't wear off. Meets a minimum of 1. 3 times the ansi/ASME standard for proof torque. Overall socket Length: 2. 48 inches. Drive end diameter: 1. 10 inches. 6-point socket opening provides an exact fit for hex fasteners. Socket well depth: 1. 13 inches. Radiused corners prevent fastener round-off by applying force to a fastener's flat sides, rather than its corners. Socket end diameter: 1. 10 inches.
BrandTEKTON #ad
ManufacturerTEKTON #ad
Height1.1 Inches
Length2.5 Inches
Weight0.46 Pounds
Width1.1 Inches
Part NumberSID13121
ModelSID13121
WarrantyNo time limits, no receipts: tekton.com/tool-help