If you need a 3/8-inch set screw, the 380-piece SAE assortment below is the only listed option that specifically includes 3/8″-16 UNC screws. It is best for buyers who need that thread size plus other common SAE sizes. The metric assortments are better for repairs that call for M3 through M8 screws, such as many bathroom-fixture and door-handle jobs. Check the required thread standard, diameter, length, and tip style before choosing: metric and SAE screws are not interchangeable.
| Product | Best For | Key Detail |
|---|---|---|
| 380-piece SAE assortment | 3/8″-16 UNC needs | 19 sizes; includes hex keys |
| 300-piece metric and SAE kit | Mixed-standard repairs | M3–M8 plus SAE sizes |
| 300-piece, 24-size metric kit | Metric flat-point needs | 304 stainless steel; five hex keys |
| 400-piece metric cup-point kit | Metric cup-point replacement | M3/M4/M5/M6/M8 sizes |
| 300-piece stainless socket kit | Common metric fixture repairs | Metric sizes M3–M8 |
380-Piece SAE 3/8″-16 Set Screw Kit
Best for: Buyers who specifically need a 3/8″-16 UNC set screw and want additional SAE sizes on hand. This kit lists 19 sizes, with 20 pieces per size, covering #4-40 through 3/8″-16. It is made from 304 stainless steel and includes seven hex wrenches.
The listed screws have a cup point, which is designed to press into a mating surface for grip. The listing also describes clean-cut threads and vibration resistance. Choose this assortment when the required specification is 3/8″-16 UNC—not simply a screw that measures 3/8 inch across.
Limitation: The kit is identified as standard SAE/UNC, so it is not the right choice for a metric-thread repair. Confirm the required length and tip style before ordering.
300-Piece Metric and SAE Set Screw Kit
Best for: Repairers who work with both metric and SAE fasteners and do not need a specifically verified 3/8″-16 screw. The listing describes a 300-piece assortment with 10 commonly used sizes, metric M3, M4, M5, M6, and M8 options, and six hex wrenches. It identifies the screws as 304 stainless steel.
The internal hex drive is intended for Allen-key installation. The product description says the screws have processed surfaces and tight threads. This mixed-standard assortment can reduce the need to keep separate metric and SAE kits, but check the size chart to confirm which SAE sizes are included.
Limitation: The provided details do not specify the exact SAE sizes or point style. Do not assume it contains 3/8″-16; verify the package size list first.
300-Piece Metric Flat-Point Assortment
Best for: Buyers who need multiple metric sizes and specifically want flat-point screws. The 24 listed size-and-length combinations cover M3, M4, M5, M6, and M8, with lengths from 3 mm to 16 mm. The assortment is described as 304 stainless steel and includes five hex wrenches.
It is a better match than the SAE kit for metric repairs involving items such as door knobs, faucets, and towel racks, provided the existing screw is a flat-point type. The product description also identifies the screws as internal-hex drive.
Limitation: This is a metric assortment, not a 3/8″-16 UNC kit. Its flat-point design may also differ from a cup-point screw required by the repair.
400-Piece Metric Cup-Point Screw Kit
Best for: Buyers replacing metric cup-point screws in door handles or bathroom fixtures. The product name lists M3, M4, M5, M6, and M8 sizes, a 400-piece total, and hex wrenches. Cup-point screws are a relevant alternative when the replacement needs a pointed gripping end rather than the flat point in the previous kit.
Limitation: The supplied product details do not identify the material, individual size quantities, or lengths. Confirm those specifications before relying on this kit for an exact replacement.
300-Piece Stainless Metric Socket Screw Kit
Best for: Buyers looking for a broad metric assortment for door handles or light fixtures. Its product name specifies stainless steel, internal hex drive, and M3, M4, M5, M6, and M8 grub screws. It may suit general fixture work when the needed metric size and screw form match.
Limitation: The available details do not give lengths, point style, or exact piece counts by size. It is not identified as containing 3/8″-16 UNC screws.
Buying Guide: How to Choose a Set Screw
Do you need 3/8″-16 or a metric screw?
Start by checking the old screw or the equipment specification. The 3/8″-16 designation means a 3/8-inch nominal diameter and 16 threads per inch in the UNC thread series. It is different from an M-size screw. The SAE assortment is the clear match in this selection when those exact threads are required.
Which point style should you select?
Match the replacement tip to the application and original part. The listed SAE kit has cup-point screws, while the 24-size metric kit specifies flat points. A different point shape can change how the screw contacts the shaft or mating surface, so do not choose by diameter alone.
What other measurements matter?
Confirm the screw length, thread pitch or standard, drive size, and material where those specifications matter. Assortment titles may list a wide range of sizes without giving every length or quantity breakdown. Use a size chart or the equipment documentation rather than guessing.
Are stainless steel assortments useful?
Several listed kits specify 304 stainless steel, which the product descriptions identify as corrosion-resistant. This can be relevant for humid areas such as bathrooms. Check the individual product details: not every kit in this selection provides a material specification.
Frequently Asked Questions
Which listed kit includes a 3/8″-16 set screw?
The 380-piece SAE assortment explicitly lists 3/8″-16 UNC among its sizes.
Is a 3/8-inch set screw the same as an M8 screw?
No. They use different thread standards and dimensions. Use the thread specification required by the equipment.
What does UNC mean in 3/8″-16 UNC?
UNC means Unified National Coarse, a thread series. The “16” indicates 16 threads per inch.
Can I use a flat-point screw instead of a cup-point screw?
Only if the application allows that point style. Match the original screw or manufacturer’s specification when possible.
Do all these assortments include hex keys?
The supplied details explicitly list hex keys for the SAE kit, the mixed metric-and-SAE kit, the 24-size metric kit, and the 400-piece metric kit. The details for the final kit do not specify included tools.