DGX Assembly Screws, Metal, Set of TWO

$7.00
In Stock
SKU
DX-609032
These metal assembly screws (aka book screws, aka sex bolts) are used for attaching various accessories, such as lift bag pouches, suit inflation mounting systems and sidemount buttplates, to a TransPac harness or to a hard backplate.

DGX Assembly Screws, Metal, Set of TWO

DGX Assembly Screws, Metal, Set of TWO
DGX Assembly Screws, Metal, Set of TWO
  • Attachment screws for underwater use
  • Marine grade chrome-plated brass
  • Fits through a 3/8-inch hole and includes o-rings
  • Includes Qty 2 complete assembly screws

Designed to fit through a 3/8-inch hole, the metal assembly screws include o-rings to help keep the screw in place.

Marine grade chrome-plated brass, sold as a set of two.

Note: we do NOT recommend using these screws to secure wings to backplates. The metal screws will not allow the cylinder to lay flat and in addition they may scratch your tank. We suggest you use the plastic assembly screws for that purpose.

More Information
Brand DGX
SKU DX-609032
Weight 0.085000

Customer Reviews

4.9
4.9 out of 5 stars
98%
19 Reviews
100% of customers
recommend this product
5 stars 18 (95%)
4 stars 0 (0%)
3 stars 1 (5%)
2 stars 0 (0%)
1 star 0 (0%)
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Verified Buyer
3
Oct 11, 2022
A bit too bulky compared to the plastic assembly screws, I'm worried it will make tanks wobble. They do mention this in the product description, but I feel like a small design change would make this not a problem.
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Response from Admin
Oct 12, 2022
As the reviewer said, we do NOT recommend this metal assembly screw, or ANY metal assembly screw for use with securing wings with backplates. More discussion at ... https://www.divegearexpress.com/library/tek-tips/stop-using-sta-or-screws
Verified Buyer
Nice.
5
Feb 3, 2020
Pros - Stronger than plastic - Integrated o-rings help prevent back out, ease installation Cons - $?
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Verified Buyer
5
Nov 18, 2019
Dose what is said it will do
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Verified Buyer
Satisfied
5
Sep 10, 2019
Great price, fast delivery
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Verified Buyer
Great
5
Mar 4, 2019
Perfect fit, fast and smooth transaction.
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Verified Buyer
Back weight plate bolts
5
Feb 28, 2019
Just what is needed to hold my back weight plate in place. Strongly recommend having a spare set in your save a dive kit (just in case)
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Verified Buyer
Awesome
5
Dec 16, 2018
Could not find item anywhere. None of my lical dive shops had them. Thank you Dive Gear Express!
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Verified Buyer
A+++
5
Oct 15, 2018
A+++
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Verified Buyer
DGX Assembly Screws, Metal
5
Oct 1, 2018
Simple, straightforward and super durable. Easy to set up and take off when needed. Well made and super strong. Got two sets to have a spare in case I add more gear to my backplate!
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Verified Buyer
Good quality
5
Aug 10, 2018
Great quality and price. One thing to note, I bought these to attach a VDH wing to an AL backplate (no STA) and the female side is too long for this purpose. A couple minutes with a dremel solved it, but just be aware if that's what you're planning on using these for. Overall I would buy them again
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Single-Tank-Adapters or Assembly Screws Are Often Counterproductive

We sell these somewhat archaic products because there is still demand, but we don't recommend them under most circumstances. Modern plates and wings have been designed to eliminate the need for either a single-tank-adapter (STA) or book screws (aka assembly screws, aka 'sex-bolts'). Divers want the most stability possible when the harness, backplate and wing (BPW) is assembled on the cylinder. The reason many divers dislike using an adapter or book screws is they actually make the assembly of the tank straps, backplate, and wing more unstable when mounted on the cylinder. Using either an STA or the screws will prevent the wing and plate from being as tight as possible against the cylinder and may allow the the plate to pivot back and forth slightly (aka tank-roll). Also, using either the screws or an STA will interfere with the built-in stabilizing pads feature some recent single tank wing designs now include (such as the DGX Gears S1 and OMS Performance Mono) in order to better conform to the cylinder shape and control tank-roll. Just to be clear, a single-tank-adapter or assembly screws are also never necessary with banded doubles (aka 'twinset') setups.

Using a single-tank-adapter can be necessity with some older or mismatched plates and wings. However, the STA is a product which predates modern backplate and wing designs that include pre-cut slots for cam straps. Using a STA sets the tank farther away from the backplate and allows the tank to rock slightly by pivoting from side to side on the bolts. Using the straps threaded through the backplate snugs the tank and wing up very tight against the backplate and does not allow the tank to rock. Threading the cam straps directly through the backplate will make the cylinder more stable and secure than using an adapter.

Plastic screws can be used to attach the wing directly to a hard metal backplate when rigged for a single tank without a STA. However, their function is just cosmetic; omitting the assembly screws does not cause a problem. Without the assembly screws, when the BPW is taken off a single tank, the wing will just hang loose on the cam straps. Adding the screws creates two small high spots that prevent the cylinder from being tight against backplate and allow the assembly to rock slightly by pivoting on the heads of the screws. Even worse, if the screws are metal they are also subject to galvanic action and cause wear on materials rubbing against them which can damage the surface of the tank and encourage corrosion. The modern plate, wing and cylinder assembly will be more stable and secure by omitting the book screws.

With modern backplates and single tank wings the use of either a single tank adapter or book screws can be counterproductive and is not considered to be best practice.