For a 3/8-inch set screw, the clearest match here is the 380-piece SAE assortment, which lists 3/8″-16 UNC cup-point screws. The other kits are primarily metric assortments or do not identify their SAE sizes, so check the package size chart before choosing one for a 3/8-inch threaded hole. The options below are best suited to buyers who need a confirmed SAE size, a mixed assortment, or metric screws for separate repairs.
| Product | Best for | Size information |
|---|---|---|
| 380-piece SAE assortment | Confirmed 3/8″-16 UNC needs | Lists 3/8″-16 |
| 300-piece metric and SAE assortment | Mixed-standard repairs | SAE sizes not specified in supplied details |
| 300-piece flat-point metric kit | Metric repairs needing flat points | M3–M8 |
| 400-piece cup-point metric kit | Metric repairs needing cup points | M3–M8 |
| 300-piece stainless steel metric kit | General metric fixture repairs | M3–M8 |
380-Piece SAE Set Screw Assortment
This is the best match for a buyer specifically searching for a 3/8-inch SAE set screw. The listed sizes include 3/8″-16 UNC, along with 18 other sizes ranging from #4-40 to 5/16″-18. The kit contains 20 pieces of each size and seven hex wrenches.
The screws are described as 304 stainless steel with a hex socket and cup point. A cup point is designed to press into a mating surface, which can help resist loosening. Choose this if you need a confirmed 3/8″-16 UNC screw and want additional common SAE sizes on hand.
Limitation: The listed 3/8-inch size is 3/8″-16 UNC; do not assume it fits a different thread pitch or a metric threaded hole.
300-Piece Metric and SAE Set
This assortment is best for buyers handling both metric and SAE repairs. Its description lists metric sizes M3, M4, M5, M6, and M8, and says the kit includes 10 commonly used sizes across both standards plus six hex wrenches. It also describes a 304 stainless steel construction and hex socket design.
Choose this if you want a mixed-standard kit for household fixtures such as door knobs, faucets, or plumbing fixtures. The product details supplied do not identify which SAE sizes are included, so this is not a confirmed pick for a 3/8″-16 repair.
Limitation: Verify the SAE size chart before ordering if your repair requires a particular 3/8-inch thread.
300-Piece Flat-Point Metric Set
This MroMax kit is best for metric repairs where a flat-point set screw is required. The 300-piece assortment covers 24 size-and-length combinations across M3, M4, M5, M6, and M8. The description also lists five Allen hex wrenches and 304 stainless steel construction.
Choose this if you need multiple metric lengths for tasks such as fixture or general maintenance repairs. A flat point differs from the cup point on the confirmed 3/8″-16 option, so match the point style to the application as well as the thread.
Limitation: This kit lists metric sizes only; it is not identified as a 3/8-inch SAE assortment.
400-Piece Metric Cup-Point Set
This kit is best for buyers who need a larger assortment of metric cup-point screws for door handles or bathroom fixtures. Its product name identifies M3, M4, M5, M6, and M8 sizes and says hex wrenches are included. The cup-point style is similar to the point type listed for the 3/8″-16 SAE kit, but the thread standard is different.
Choose this for metric fixture work when the screw size is known. The supplied details do not provide a complete breakdown of lengths, material, or individual quantities.
Limitation: The listing identifies metric sizes, not 3/8″-16 UNC.
300-Piece Metric Socket Screw Kit
This assortment is best for general metric fixture repairs when you need socket-drive screws in several sizes. The product name lists M3, M4, M5, M6, and M8 and identifies uses such as door handles and light fixtures. The supplied details do not specify the point style or the individual lengths.
Choose this if your repair calls for one of the listed metric sizes and you want a multi-size kit. It is less suitable when the required thread pitch, point style, or exact length has not been confirmed.
Limitation: The product information provided does not identify a 3/8-inch SAE size.
Buying Guide: How to Choose a 3/8 Set Screw
Is 3/8 inch the diameter or the screw length?
Check the full thread designation, not just “3/8.” In the listed SAE assortment, the size is 3/8″-16 UNC: 3/8 inch is the nominal diameter and 16 is the thread count per inch. A 3/8-inch measurement by itself does not confirm the thread pitch.
Does the point style matter?
Yes. The confirmed SAE option has a cup point, while one metric kit has a flat point. Select the same point style as the original screw or follow the equipment maker’s specification. Point shape can affect how the screw contacts the shaft or other surface.
Should you choose an assortment or a single known size?
An assortment is useful when you make varied repairs and need multiple sizes available. For a specific 3/8″-16 repair, prioritize a kit that explicitly lists that size. Metric-only assortments are not substitutes for SAE threads, even if their screws appear similar.
What material and tools should you check?
Several listings describe 304 stainless steel and include hex wrenches. Confirm that the supplied wrench size matches the screw socket and that the screw material suits the environment and application. Do not rely on an assortment’s total piece count alone; check its size and quantity breakdown.
Frequently Asked Questions
Which listed product includes a 3/8″-16 set screw?
The 380-piece SAE assortment explicitly lists 3/8″-16 UNC cup-point set screws.
Is a 3/8″-16 screw interchangeable with an M8 screw?
No. They use different thread standards and dimensions. Confirm the thread on the part before installation.
What does UNC mean on a 3/8″-16 screw?
UNC refers to Unified National Coarse thread. The “16” indicates 16 threads per inch for this listed size.
Are the metric kits suitable for a 3/8-inch threaded hole?
Not based on the supplied size information. The metric kits list M3 through M8 sizes, while the confirmed SAE kit lists 3/8″-16 UNC.