Kerr Lakeside
Kerr Lakeside 31C225KCS 5/16-18 x 2.25in Socket Head Cap Screw 100pcs
A pack of 100 alloy-steel socket-head cap screws with a 5/16-18 UNC thread, 2.25 in length, black-oxide finish and 1/4 in hex drive
- TypeSocket
- MaterialHAWA
- Alloy steel construction provides high tensile strength
- Black oxide finish resists corrosion and wear
- Hex socket drive allows secure installation with 1/4 in key
- UNC coarse threads ensure reliable grip in standard holes
- 100-piece pack supplies enough fasteners for large projects
Socket head cap screw for inch-system assemblies
The Kerr Lakeside 31C225KCS is a 5/16-18 UNC socket head cap screw made from alloy steel with a black oxide finish. Each fastener measures 2.25 inches in length and features a 1/4 inch hex socket drive. The thread is partially threaded with a minimum thread length of 1 3/8 inches. This 100-piece pack suits maintenance, fabrication and machine assembly tasks that require inch-series fasteners.
Alloy steel construction handles clamping loads
The alloy steel body provides the strength expected of a standard socket head cap screw under typical clamping forces. Black oxide finish adds mild corrosion resistance and reduces light reflection. The cylindrical head height ranges from .306 to .312 inches, allowing the fastener to seat flush in counterbored holes. No lubrication or special surface treatment is specified for standard installation.
1/4 inch hex drive fits common hex keys and bits
Installation requires a 1/4 inch hex driver or bit, a size widely available in inch and metric tool sets. The right-hand UNC coarse thread engages standard 5/16-18 nuts and tapped holes. Partially threaded shank leaves an unthreaded grip length for alignment or shear resistance. The pack supplies 100 pieces for repeated use across multiple joints or spare inventory.
Highlights
- Alloy steel construction provides high tensile strength
- Black oxide finish resists corrosion and wear
- Hex socket drive allows secure installation with 1/4 in key
- UNC coarse threads ensure reliable grip in standard holes
- 100-piece pack supplies enough fasteners for large projects
Specifications
| Brand | Kerr Lakeside |
|---|---|
| Type | Socket |
| Material | HAWA |
Questions about this item
How do I install the 5/16-18 x 2.25 in socket head cap screw, and what step is often missed?
Use a 1/4 in hex key to drive the socket head; the step people miss is checking that the 1 3/8 in thread length engages fully before the unthreaded shank bottoms out.
What maintenance or replacement will these alloy steel screws with black oxide finish need later?
Inspect the black oxide coating for wear or corrosion; replace any screw showing stripped hex drive, stretched threads, or rust on the 5/16 in diameter shank.
What limit appears first when these partially threaded screws are under sustained clamping load?
The 1 3/8 in minimum thread length means the threaded zone yields or strips before the unthreaded shank reaches its shear capacity.
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