RTL Fasteners Complete Metric Assortment Review

Manufacturer: RTL Fasteners
Available From: RTL Fasteners
Retail Price: $119.95


t has happened more than once: I NEED a particular nut, bolt or washer to complete the assembly of my new ARF and someone shorted me some of the hardware (of course “I” would never admit I lost those parts). What to do? Forget WalMart, Kmart and even many hardware stores as they wouldn’t even consider handling what a modeler needs, especially at 9 PM the night before we want to temp fate and fly our latest and greatest.

A solution to the “missing hardware” can be found by purchasing the Metric Assortment # 992 from RTL Fasteners, because in this collection of nuts, bolts and washers, you will always have on hand exactly what you need!

There are four sizes of these items; M4 size; M3 size; M2.5 size size and M2. The reason I like the Metric System is because it is so simple; the larger the number, the larger the size. So a M4 metric bolt is larger in diameter than a M3 metric bolt. All I have to do is worry about the length needed. And once again the simplicity of the Metric System strikes again: the larger the number of milimeters, the longer the bolt. So a Metric M4 x 16mm is shorter than a M4 25mm and a M3 bolt is larger than a M2 bolt.

For most of our planes that come from Asia and Europe, the sizes of the metric hardware are given in the instructions, and sometimes the quality of the hardware is questionable. All the components found in the RTL Fasteners are of HIGH quality. All bolts (technically machine screws) are of the black socket head variety. The bolts are made of a high quality hardened black alloy steel, grade 12.9. And for those of us who know zip about hardness, 12.9 is good. In fact, it’s VERY good. In additon to the bolts, they have included: blind nuts; flat washers; split washers; hex nuts; and lock (nylon) nuts for each of the four sizes!

There are an appropriate number of items of each kind – 12, 24, and up to 200 depending on which component. As you can see from the pictures, each item comes in its own clear package, and is clearly labeled.

I’ve always believed in what some great unknown modeler once told me: “Purchase quality tools and accessories and you will never regret what you paid for them”. I’ve followed that advice all my modeling life and have not had to look back and apologize for my purchase!


Here is what you will receive when you order their Metric Assortment # 992.

What you’ll get:

● Socket Head Cap Screws (12each): M2x8, 12, 16, 20mm = 48pcs, M2.5×8, 12, 16, 20mm = 48pcs, M3x12, 16, 20, 30mm = 48pcs
● M4x16, 25, 35mm = 36pcs
● Nylon Insert Lock Nuts: 12 pcs. of M2 plus 50ea of M2.5, M3, M4 = 162pcs
● Hex Nuts: 50ea: M2, M2.5, M3, M4 = 200pcs
● Blind (T) Nuts: 8 Each of M3 and M4 =16pcs
● Flat Washers: 50 ea: M2, M2.5, M3, M4 = 200pcs
● Lock (Split) Washers: 50 ea: M2, M2.5, M3, M4 = 200pcs
● Servo Mounting Screws #2×7/16″ 24pcs
● Servo Mounting Screws #2×9/16″ 24pcs.
Total Pcs. = 1,006


First, notice you get three plastic storage boxes. Each storage box comes with dividers.

Three sturdy containers – one for each of the three sizes supplied.

Plastic dividers are in each container.

Be careful when you cut the dividers and take note as to which way they are to be inserted into the storage box. The ridged portion goes to the top! If you reverse the installation it will be very difficult to insert the divider.

Take note of the extra ridge on the sides of the separators.

Next, cut out the map provided for each of the storage bins, and tape each of them to the inside top. That arrangement should be mirrored in the divider’s arrangement.

Map – cut it out and paste it on the inside of the container.

A little tape to hold the ‘Map’ in place.

You can now proceed to empty the appropriate bag into the correct location in the plastic storage container for each of the sizes.

All complete and it took about an hour to get to this point – and less than a minute to complete installing my cowl!

Now, you are organized :)

Empty now———to become——>

M4 container. This size of hardware will be found on .90-1.20 sized planes and greater.

M3 Container completed

M2 and M2.5 Container now full


RTL Fasteners also included a couple of extra things that I would like to bring to your attention. The first is their offerings of two different sized servo screws. The offer both 7/16″ and 9/16th #2 sizes. What is so special about these servo screws is that they have a washer built into the screw and secondly, they need a hex driver to tighten! If you are a newbie you may be wondering what is so great about all this hex head screw business. Because your hex driver fits INTO the screw head, there’s no more stripping out the screw! It has been my experience that frequently there are two or four servo screws that are way back there, and by merely inserting the hex head into the servo screw, you can easily reach those hard to find locations without losing the screw! I have used these screws to secure canopies, hatches and even control horns. They have a million uses, so I purchase them in groups of hundreds (and I still run out!).

RTL Fasteners also included a couple of ‘bonus’ packages and you will see the bottom two rows have servo screws the package to the upper right is something REALLY special and I’ll discuss this later.

There are 24 servo screws in a bag. Notice how the hex driver is holding the servo screw – it is a nice tight fit!

I’ve often used my DuBro hex driver (SAE) to mount servos.


Now for something I have been playing with and never really solving – cowl screws that won’t stay in, or if they stay in, cut up the cowl hole so large that the head of the screw doesn’t hold anything in place! I’ve tried cutting short pieces of fuel tubing between the screw and the cowl, but the screw head usually slides into the tubing gaining nothing. Some times I’ve placed large washers between the screw (or bolt) and that just looked terrible. These washers have rubber on one side, and are stainless on the other side. The rubber will keep the screw/cowl junction from moving (and enlarging the hole) while the stainless side with look great!

If you have had cowl screws vibrate out, check these out!

Even before the first flight of my H9 Pulse 125 I had a problem… one cowl bolt missing (gotta watch those bolt sealing Gremlins that sneek around the workroom late at night). Problem solved. I replaced the missing bolt with the just arrived Metric Assortment! I added one of those stainless washers to help keep the cowl’s hole from enlarging, and it works!

Typical situation, one cowl bolt missing (M3). Even Ace Hardware was of no help to find a replacement!

Replaced stock M3 with M3x12mm. Notice the stainless washer – a size M2 but the M3 bolt fit – by just screwing it in!


RTL Fasteners are filling a void that will relieve a lot of stress among modelers of all kinds. For personal reasons, those who purchase actual kits will frequently replace much of the supplied hardware, and probably the majority of ARF assembliers HAVE to replace the hardware that comes in their planes since much of it can be considered as marginal quality. By purchasing this Metric Assortment # 992, swapping out various nuts and bolts should not prove a major stumbling block. I really like the three sizes……large (M4); medium (M3) and small (very small) M2 and M2.5. I believe whether you fly large glow or small park flyers, your metric hardware is there!


● Storage and organization is excellent
● Appropriate sizes for modelers
● High quality hardware
● The parts will always be there when you need them and they never grow old!


● Could be pricey for some

Source: Jerry Festa on RC Groups

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