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Box of 100 black oxide alloy steel socket head cap screws

Kerr Lakeside

Kerr Lakeside 31C150KCS .31 - 18 x 1.5 in. Socket Head Cap Screw Alloy Steel Black Oxide 100 Pieces

SKU CH-HPW5-T5JH4

Alloy-steel socket-head cap screws, 5/16-18 UNC × 1.5 in, black-oxide finish, fully threaded, 100 pieces

  • Product typeSocket
  • Main materialHAWA
  • Alloy steel construction delivers high tensile strength for demanding fastening tasks
  • Black oxide finish provides corrosion resistance to extend service life in harsh environments
  • Hex socket drive enables secure tool engagement for reliable torque application
  • Fully threaded shank ensures maximum grip across the entire 1.5 in length
  • 100-piece pack supplies ample quantity for production runs or maintenance inventory

Kerr Lakeside Socket Head Cap Screws

This pack contains one hundred alloy steel socket head cap screws with a black oxide finish. They use a coarse UNC thread at 5/16-18 and a fully threaded shank. The hex socket drive accepts a 1/4 inch key. These fasteners suit general mechanical assembly and maintenance tasks.

UNC Coarse Thread Practical Limits

The 5/16-18 UNC thread provides standard coarse pitch engagement for inch-based hardware. Coarse threads tolerate minor debris and speed up assembly compared with fine pitch alternatives. They are not suited to high-vibration environments without additional locking features. The black oxide finish offers mild corrosion resistance but is not a substitute for plating in wet conditions.

Fully Threaded 1.5 Inch Length

Every screw in the box is fully threaded along its 1 1/2 inch length. This single dimension determines whether the fastener can span the required grip range in your joint. Buyers who need a longer reach or a partial thread for shear loading must select a different part.

How it compares

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

Price $26.99
Typical for this category: the median of 5,493 items is $27.99.

Specifications

Product
Brand nameKerr Lakeside
Product typeSocket
Size & build
Main materialHAWA

Questions about this item

Which pack size should I choose for this screw?

The product is sold as a single pack containing 100 pieces of the 5/16-18 x 1.5 inch socket head cap screw.

What does the 5/16-18 thread specification mean for installation?

It indicates a 5/16 inch diameter with 18 UNC coarse threads per inch, requiring a matching 5/16-18 tapped hole or nut for proper engagement.

What does the 1/4 inch hex drive size cap in practice?

The 1/4 inch hex socket drive limits the tooling to a 1/4 inch hex key or bit, which determines the maximum torque you can apply without rounding the recess.

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