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E-Z LOK 400-4 Threaded Insert, Brass, Knife Thread, 1/4"-20 Internal Threads, 0.500" Length (Pack of 25)

E-Z LOK 400-4 Threaded Insert, Brass, Knife Thread, 1/4"-20 Internal Threads, 0.500" Length (Pack of 25)

Q: Do these fit alł or most beer tap faucets?

Careful! Although this is a 3/8-16 threaded insert it is a knife thread so it may not bite into the material. I tried using these in oak wood to use as a tap handle but it would not grab. I needed a coarser outside thread. These threads simply began to break off. I reverted to buying inserts from Lowes. I could not find a coarse outside threaded insert on Amazon.

Q: Hi what is the outside diameter of this product ?

I measured the diameter as 0.5945 inches (~19/32"). I ended up using a 9/16 drill to make the hole large enough to screw into a hard maple block with their insertion tool. As others have stated, using a 3/8-16 bolt/bushing combination will have more grip than the insertion tool.

Q: Tried a 1/2 drill bit for the 3/8"-16 internal insert and it was way too tight! i am drilling into cedar and bamboo laminated. what should i do?

The outside diameter of that insert is 19/32", so unless you can find a 33/64" drill bit, I recommend you taper ream the entry side of the insertion hole a small bit - with a hand taper reamer. Keep trying - in scrap wood - until you find a taper that allows the threads to get a bite in the wood. Also recommend that you apply wax or bar soap to the threads - and use an insertion tool.

Q: will these work in plywood?

Yes. Needless to say the wood has to be thick enough to support the height of the insert. These will work in any wood type (manufactured woods, hardwoods, softwoods, etc.) If you used in hardwoods with a high Janka rating (i.e, Purple Heart, Brazillian Cherry, Hard Maple, etc) it might more difficult to screw the insert in. I usually increase the hole size 'slightly'. Verify the right size of the hole in a piece of test material prior to doing it for the first time on your project.

Product ID: 315219332

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Details

Size
Knife Thread
Colour
Gold
Material
Brass
Brand
E-Z LOK
Item dimensions L x W x H
13 millimetres

🔩1/4"-20 internal threads

🪵Knife thread for hardwood grip

⚙️0.500" length for deep secure hold

Frequently Bought Together

E-Z LOK 400-4 Threaded Insert, Brass, Knife Thread, 1/4"-20 Internal Threads, 0.500" Length (Pack of 25)

E-Z LOK 400-4 Threaded Inserts for Wood, Installation Kit, Brass, Includes 1/4-20 Knife Thread Inserts (5), Drill, Installation Tool,Gold-Black-Silver

1/4-20 x 3/4" Flat Head Socket Head Screw Furniture Bolts Countersunk Connector Screws, Stainless Steel 18-8 (304), Black Oxide, Fully Threaded, 25 PCS

Description

🔧 Lock in strength, unlock your project’s potential!

KNIFE EDGE GRIP - Proprietary external knife threads deliver unbeatable holding power in oak, cherry, and maple
EASY INSTALLATION - Simply drill and install with a screwdriver or optional drive tool—no fuss, no downtime
PREMIUM BRASS FINISH - Durable, corrosion-resistant brass ensures longevity and a sleek flush mount appearance
VERSATILE APPLICATION - Perfect for furniture, storm windows, marine projects, and protective paint setups
PRECISION THREADING POWER - Robust 1/4"-20 machine threads engineered for lasting strength in hardwoods

The E-Z LOK 400-4 Threaded Insert pack of 25 features 1/4"-20 internal threads with a 0.500" length, crafted from brass with proprietary knife threads for superior hold in hardwoods like oak and maple. Designed for easy installation and versatile use in furniture, marine, and window applications, these inserts provide a durable, flush mount fastening solution that professionals trust.

Specifications

Fastener type	Thread Locking
Head style	Flush Mount
Finish type	Brass
Shape	Round
Thread size	1/4-inch 20
Number of pieces	25
Compatible groove diameter	0.25 inches
Global Trade Identification Number	00839137005004
Manufacturer	EZ-Lok
UPC	839137005004
Part number	400-4
Item Weight	4.54 g
Item model number	400-4
Style	0.500" Length (Pack of 25)
Finish	Brass
Item Package Quantity	1
Head Style	Flush Mount
Measurement System	US
Specific uses	Metal
Batteries included?	No
Batteries Required?	No

Have a Question? See What Others Asked

Do these fit alł or most beer tap faucets?

Hi what is the outside diameter of this product ?

Tried a 1/2 drill bit for the 3/8"-16 internal insert and it was way too tight! i am drilling into cedar and bamboo laminated. what should i do?

will these work in plywood?

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