We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Box of 100 black oxide alloy steel socket head cap screws

Kerr Lakeside

Kerr Lakeside 31C175KCS .31 - 18 x 1.75 in. Socket Head Cap Screw Alloy Steel Black Oxide 100 Pieces

SKU CH-JCH9-WJZV4

100 alloy-steel socket head cap screws with a black oxide finish, 5/16-18 UNC thread and 1.75 in length

  • Product typeSocket
  • Main materialHAWA
  • Alloy steel construction delivers high tensile strength for demanding fastening tasks
  • Black oxide finish provides corrosion resistance and a professional dark appearance
  • Hex socket drive allows secure engagement with 1/4 inch hex keys
  • UNC coarse thread ensures reliable grip in standard inch-threaded holes
  • 100-piece bulk pack supplies ample quantity for workshop or production use

Kerr Lakeside 31C175KCS Socket Screws

The Kerr Lakeside 31C175KCS is a pack of 100 alloy steel socket head cap screws with a black oxide finish. Each fastener uses a 5/16-18 UNC thread and measures 1.75 inches in overall length. A 1/4 inch hex socket drive allows installation with standard hex keys. The partially threaded design includes a minimum thread length of 1 3/8 inches.

Ideal for general fastening and maintenance

These screws suit workshops and technicians who need a bulk supply of coarse-threaded inch fasteners for machinery, fixtures or automotive components. The alloy steel construction provides high tensile strength for structural joints. Buyers requiring fine-thread pitches, metric dimensions, stainless steel corrosion resistance or fully threaded shanks should look at other fastener types.

Critical spec: 5/16-18 UNC thread

The single specification that decides fit is the 5/16 inch diameter with 18 threads per inch in a 1.75 inch length. Verify the mating hole and nut match this exact UNC coarse pitch and that the grip range accommodates the 1 3/8 inch thread length and .312 to .306 inch head height.

How it compares

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

Price $23.99
Cheaper than about 57% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameKerr Lakeside
Product typeSocket
Size & build
Main materialHAWA

Questions about this item

What thread standard does the 5/16-18 UNC coarse thread follow?

The screws use a 5/16-18 UNC coarse thread with right-hand direction and a minimum thread length of 1 3/8 in.

What hex key size drives the 1/4 in. socket head?

A 1/4 in. hex key fits the internal socket drive on each alloy-steel cap screw.

How do you avoid stripping the black-oxide finish during installation?

Use a properly sized 1/4 in. hex bit, apply steady axial force, and stop when the cylindrical head seats flush.

More in Bits, Hole Saws & Accessory Kits

Similar items