Cap Screw Kits

Cap screw kits keep commonly used threaded fasteners together for commercial assembly, repair, maintenance, and replacement work. The available assortments include metric and inch hex head cap screws in a range of diameters, thread types, and lengths; select kits also include matching nuts, flat washers, and split lock washers for routine fastening tasks.

Product Display:
Helpful Buying Guide

Choose a Cap Screw Kit for the Fasteners You Use Most

A well-matched assortment can help maintenance teams, technicians, and shop buyers keep common fastening components available in one organized selection. Start with the thread system and sizes required for the work, then compare thread type, included hardware, material, finish, piece count, and screw-length range.

Visual Guide

Popular examples in this category

250-Piece Metric Hex Head Cap Screw Assortment, M4–M12250-Piece Metric Hex Head Cap Screw Assortment, M4–M12WBB2170206#6-32 Phillips/Slotted Truss Head Machine Screw Kit, 370 Pieces#6-32 Phillips/Slotted Truss Head Machine Screw Kit, 370 PiecesWBB3148381Metric Hex Head Cap Screw Assortment, M6–M16, 1,800 PiecesMetric Hex Head Cap Screw Assortment, M6–M16, 1,800 PiecesWBB21702019-Piece Multi-Drive Screw Guide Bit Holder Kit9-Piece Multi-Drive Screw Guide Bit Holder KitWBB3148396
Use Cases

Keep common hardware ready for assembly and repair

Hex head cap screw assortments support general assembly, maintenance, repair, and replacement work. Kits with matching nuts and washers provide coordinated components for fastening tasks.

How to Choose

Match diameter, thread, and length first

Choose metric kits for M4 through M12 or M6 through M16 needs. For inch sizes, compare coarse threads such as 1/4-20, 5/16-18, and 3/8-16 with fine threads such as 1/4-28, 5/16-24, and 3/8-24. Then select the needed screw lengths.

Applications

Select specialized kits for the task

Wall plate screw kits are for compatible outlet covers and electrical wall plates, while #6 wood rocket screws are for fastening drywall or sheetrock to wood framing. A multi-drive bit holder kit supports screw-fastening tasks and helps hold long screws in place.

Additional Info

Compare the hardware included in each assortment

Some cap screw kits include finished hex nuts, flat washers, and split lock washers. Material and finish choices represented include zinc-plated steel, 304 stainless steel, carbon steel, brass, nylon, and stainless steel in a wall plate assortment.

1,800Pieces in the largest listed cap screw assortment

The M6–M16 metric kit combines cap screws with matching nuts and washers.

M4–M16Metric diameter coverage represented

Available metric assortments span ranges from M4 through M12 and M6 through M16.

1/2–1-1/2 in.Length range in select inch-size kits

Listed coarse-thread, fine-thread, and 304 stainless assortments cover this range.

3Common inch thread sizes in select kits

Several assortments include 1/4 in., 5/16 in., and 3/8 in. sizes.

Comparison Guide

Compare the Main Kit Types

Use this overview to narrow the selection based on the thread system, included components, and stated construction.

Kit typeThread and size optionsIncluded components and stated material
Metric hex head cap screw assortmentsM4–M12 or M6–M16; multiple listed lengths and thread pitchesCap screws; the M6–M16 kit also includes hex nuts, flat washers, and split lock washers; zinc-plated steel with Grade/Class 8.8 designations
Inch hex cap screw assortmentsCoarse: 1/4-20, 5/16-18, 3/8-16; Fine: 1/4-28, 5/16-24, 3/8-24Cap screws with matching finished hex nuts, flat washers, and split lock washers; Grade 5 zinc-plated steel or 304 stainless steel options
Specialty screw kits#6-32 wall plate screws or #6 wood rocket screws in assorted lengthsWall plate kits offer assorted lengths and colors, with material options varying by kit; wood rocket kit has a single-lead point, spaced threads, and countersunk bugle head
Planning Guide

Plan the right fit before choosing

Thread and size planning

Confirm the fastening system before selecting a kit

Cap screw assortments in this category cover both metric and inch fastening needs. Metric options span M4 through M12 or M6 through M16, while inch-size assortments cover 1/4 in., 5/16 in., and 3/8 in. diameters. Fine-thread and coarse-thread selections are separate, so verify the required thread designation before buying.

  • Metric ranges include M4–M12 and M6–M16.
  • Coarse-thread options include 1/4-20, 5/16-18, and 3/8-16.
  • Fine-thread options include 1/4-28, 5/16-24, and 3/8-24.
  • Several inch-size assortments offer screw lengths from 1/2 in. through 1-1/2 in.
Hardware, material, and finish

Choose the component mix that fits the work

If the job requires more than cap screws, select an assortment that includes matching hardware. Available sets may pair cap screws with finished hex nuts, flat washers, and split lock washers. Compare the stated material, grade, class, and finish to align the kit with your specified fasteners.

  • Grade 5 zinc-plated steel options are available in coarse-thread and fine-thread assortments.
  • Class 8.8 and Grade 8.8 metric steel options are represented.
  • A 304 stainless steel assortment includes matching hardware.
  • Zinc-plated steel components are available in several cap screw assortments.
Organization and quantity

Balance assortment breadth with the volume you need

Piece counts range from smaller driving-bit kits to substantial fastener assortments. Organized cases and compartmented storage help separate included sizes for selection and access. Compare total piece count with the types of components included, since a kit with screws, nuts, and washers distributes its total across multiple hardware pieces.

  • Cap screw assortments range from 250 to 1,800 pieces among the listed options.
  • Several specialty screw kits contain 450 pieces.
  • A six-compartment case is used in selected screw and bit kits.
  • Wall plate screw kits use 12-compartment organization.
FAQ

Common questions before buying

What is included in a cap screw kit?

Contents vary by kit. Some contain cap screws only, while others combine cap screws with matching finished hex nuts, flat washers, and split lock washers.

Are metric and inch cap screw kits both available?

Yes. Listed metric assortments cover M4–M12 and M6–M16 ranges, while inch assortments include 1/4 in., 5/16 in., and 3/8 in. sizes.

What is the difference between coarse-thread and fine-thread kits?

Coarse-thread kits include 1/4-20, 5/16-18, and 3/8-16 sizes. Fine-thread kits include 1/4-28, 5/16-24, and 3/8-24 sizes.

Which materials and finishes are represented?

The listed products include zinc-plated steel, 304 stainless steel, carbon steel, brass, nylon, and stainless steel options, depending on the kit.

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