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Box of 100 black oxide flat head socket cap screws

Kerr Lakeside

Kerr Lakeside 5/16-18 x 2 in. Flat Head Socket Cap Screw Black Oxide 100 Pieces

SKU CH-DN37-NEN77

A pack of 100 black-oxide alloy-steel flat-head socket cap screws with a 5/16-18 UNC thread, 2 in length, 3/16 in hex drive and 82-degree head angle

  • Product typeSocket
  • Main materialHAWA
  • Alloy steel construction delivers high tensile strength
  • Black oxide finish resists corrosion in harsh environments
  • 82-degree flat head sits flush with surfaces
  • 3/16-inch hex socket drive prevents cam-out
  • 100-piece pack covers large-scale fastening jobs

Flat Head Socket Cap Screw 5/16-18

The Kerr Lakeside fastener is a flat head socket cap screw with a 5/16-18 UNC coarse thread and a 2 inch overall length. It is made from alloy steel with a black oxide finish for corrosion resistance. The 82 degree head angle allows the screw to sit flush in countersunk holes. This pack contains 100 pieces for production or maintenance use.

Threaded Length And Drive Details

The partially threaded design provides a minimum thread length of 1 1/8 inches for secure engagement in thicker materials. A 3/16 inch hex socket drive allows installation with standard hex keys or bits. Right hand thread direction follows conventional tightening practice. The head height measures .198 inches for low profile clearance.

Bulk Quantity For Workshop Supply

The 100 piece package supports high volume assembly, automotive repair or industrial maintenance tasks without frequent reordering. Black oxide coating reduces light reflection and provides mild lubricity during installation. Alloy steel construction delivers consistent mechanical strength across the batch. No additional accessories or software are included with this hardware pack.

How it compares

Measured against everything we stock in Bits, Hole Saws & Accessory Kits, at today’s prices. Recalculated every night.

Price $44.99
Pricier than about 64% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameKerr Lakeside
Product typeSocket
Size & build
Main materialHAWA

Questions about this item

How do I install the 5/16-18 flat head socket cap screw without stripping the 3/16 in hex socket?

Use a 3/16 in hex key fully seated in the socket drive, apply steady torque without angling the tool, and stop when the flat head sits flush at the 82 degree countersink angle.

Will the black oxide finish on these alloy steel screws need replacement or re-coating over time?

The black oxide coating provides mild corrosion resistance; in dry indoor use it lasts the life of the fastener, but in damp or outdoor environments the finish can wear and the underlying steel may eventually rust.

At what point does the 1 1/8 in thread engagement limit the holding power under sustained vibration?

The partially threaded shank offers 1 1/8 in of UNC coarse thread; once the clamped joint relaxes enough that fewer than those threads remain engaged, preload drops and the fastener can loosen under cyclic loading.

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