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Local hardware stores oftentimes carry anywhere from a small to large assortment of screws, nuts, and other threaded items. Replacement screws for your equipment can be bought from many sources (I sell screws for most SP markers on here). This chart shows the screw tap size and screw characteristics used in SP markers.

An example screw type would be 10-32 x 1/2".
The first number (10) is the pitch diameter for that particular thread (this is one of the diameters of the screw, don't worry about which one in specific).
The second number (32) is the number of threads per inch.
The last number (1/2") is the length of the screw threads. To convert this to a decimal, just run the fraction through a calculator.

Also note that in these descriptions the "screw type" of the stock screws are listed. In some cases the screw head can be different, depending on the use.

Marker Screws:

Shocker Sport:
Description: Screw thread: Screw type:
Grip panel screws (4) 6-32 x 3/8" button head, phillips
Circuit housing screws (4) 10-32 x 1/2 socket head, phillips
Frame screws (2) 1/4-20 x ? button head, 5/32" hex socket
Trigger return spring set screw (all frames) 1/4-28 x 1/4" 1/8" hex socket
Air assist port threads 10-32
Fire piston housing chamber threads 15/16-20
Body manifold chamber threads 1/8" NPT
Bolt tip threads 10-32
Barrel threading Shocker
Impulse:
Description: Screw thread: Screw type:
Grip panel screws (4) 6-32 x 3/8" button head, phillips
Frame/body screws (2) 1/4-20 x 1" low-profile socket head, 1/8" hex socket
Frame/circuit housing screws (2) 6-32 x 5/16" button head, phillips
Trigger pre-travel set screw (2002+ frames) 1/4-28 x 1/4" 1/8" hex socket
Trigger return spring set screw 1/4-28 x 1/4" 1/8" hex socket
Solenoid air transfer port screw 4-40 x 3/32" 0.05" hex socket
Vision ribbon screw 2-56 x 1/8" button head, 0.05" hex socket
Mainboard screws (2) 2-56 x 5/32" button head, phillips
Daughterboard screws (2) ? x ? socket head, phillips
Vertical adapter lock screw 4-40 x 3/8" socket head, 3/32" hex socket
Valve lock screw threads 7/16"-20
Vertical adapter screw, old (air fitting) 1/8" NPS vented socket head, 3/16" hex socket
Vertical adapter screw, new (ported adapter) 1/4-28 x 1/2" socket head, 3/16" hex socket
Stock bolt spring bearing set screw 5/16-18 x 3/8" 3/32" hex socket
Valve endcap threads 1"-16
Body manifold chamber threads 1/8" NPT
Tapeworm fitting threads 1/8" NPT
Ram/hammer threads 12-28
Barrel threading Impulse/Ion
Shocker SFT:
Description: Screw thread: Screw type:
Grip panel screws (4) 6-32 x 5/16" button head, phillips
Frame/body screws (2) 10-32 x 11/16" button head, 1/8" hex socket
PL frame, rear body screw 10-32 x 1/2" socket head, 5/32" hex socket
Note: "PL frames" include the 06 Dynasty, Dark, and Tonton frames.
Trigger return magnet set screw 1/4-28 x 1/4" 1/8" hex socket
Stock trigger pre-travel set screw 4-48 x 3/8" 0.05" hex socket
Stock trigger post-travel set screw 4-48 x 1/4" 0.05" hex socket
Stock trigger firing point set screw 4-48 x 3/8" 0.05" hex socket
Vision ribbon screw 2-56 x 1/8" button head, 0.05" hex socket
Body air transfer port screws (4) 4-40 x 3/32" 0.05" hex socket
Vertical adapter screw 1/4-28 x 1/2" socket head, 3/16" hex socket
Manifold/body screws (2) 4-40 x 1/4" button head, 1/16" hex socket
Solenoid/manifold spacer screws, current (2) ? x ? speciality high-profile socket head, 1/16" hex socket
Solenoid/manifold spacer screws, old (2) ? x ? 1/8" external socket hex
Circuit board lock screws (2) 2-56 x 1/8" socket head, 5/64" hex socket
Note: The old manifold screws and attaching circuit board lock screws are no longer used.
Solenoid insert chamber threads 1/4-28
Bolt guide threads 1 1/4-28
Barrel threading Shocker
Shocker NXT:
Description: Screw thread: Screw type:
Grip panel screws (4) 6-32 x 5/16" button head, 5/64" hex socket (phillips-head also works)
Trigger stop retaining screw 6-32 x 5/16" button head, 5/64" hex socket
Frame/body screws (2) 10-32 x 1/2" socket head, 5/32" hex socket
Stock trigger adjustment set screws 4-48 x 3/8" 0.05" hex socket
Eye cover screws (2) 3-48 x 5/32" button head, 1/16" hex socket
Body air transfer port screws (4) 4-40 x 3/32" 0.05" hex socket
Vertical adapter screw 1/4-28 x 1/2" socket head, 3/16" hex socket
Manifold/body screws (2) 4-40 x 1/4" button head, 1/16" hex socket
Solenoid/manifold spacer screws, current (2) ? x ? speciality high-profile socket head, 1/16" hex socket
Solenoid insert threads 1/4-28
Bolt guide threads 1 1/4-28
Board pin threads (2) 4-48
Powerswitch actuator pin threads 4-48
Trigger pin threads 8-32
Bottomline dovetail rail set screw 10-32 x 5/16" 3/32" hex socket
Barrel threading Impulse/Ion
Vertical feedneck threading NXT threads 55/64-32 threading (technically...)
Nerve:
Description: Screw thread: Screw type:
Grip panel screws (4) 6-32 x 5/16" button head, phillips
Trigger rest plate screw 6-32 x 5/16" button head, phillips
Front frame/body screw 10-32 x 11/6" button head, 1/8" hex socket
Rear frame/body screw 10-32 x 1/2" socket head, 5/32" hex socket
Trigger return magnet set screw 1/4-28 x 1/4" 1/8" hex socket
Stock trigger pre-travel set screw 4-48 x 3/8" 0.05" hex socket
Stock trigger post-travel set screw 4-48 x 1/4" 0.05" hex socket
Stock trigger firing point set screw 4-48 x 3/8" 0.05" hex socket
Vision ribbon screw 2-56 x 1/8" button head, 0.05" hex socket
LPR lock screws (2) 4-40 x 1/8" 0.05" hex socket
Bolt carriage bearing set screw ? x ? 3/16" hex socket
Bolt carriage knob screws 4-40 x 3/8 socket head, ? hex socket
Vertical adapter screw 1/4-28 x 1/2" socket head, 3/16" hex socket
Manifold/body screws (2) 4-40 x 5/32" button head, 1/16" hex socket
Solenoid/manifold spacer screws, current (2) ? x ? speciality high-profile socket head, 1/16" hex socket
Solenoid insert threads 1/4-28
Ram/hammer threads 12-28
Piston lock screw threads ?
Barrel threading Impulse/Ion
Ion:
Description: Screw thread: Screw type:
LP hose air fitting threads (3) 10-32
Breech/vertical adapter screw 10-32 x 1/2" flat socket head, 1/8" hex socket
Frame screws (2) 10-32 x 1" button head, 1/8" hex socket
Stock trigger post-travel set screw 4-48 x 1/4" 0.05" hex socket
Trigger return magnet set screw 1/4-28 x 1/2" 1/8" hex socket
Grip panel screws (4) 6-32 x 5/16" button head, phillips
Barrel threading Impulse/Ion
pneuVentures Shocker:
Description: Screw thread:
Front frame screw 1/4-20 x 1-3/16"
Rear frame screw 10-32 x 1/2"
Trigger guard screw 10-32 x 1/2"
Solenoid mount screws (4) 4-40 x 11/16"
Note: All pVI Shocker screw lengths are my estimates only.
Barrel threading Autococker/Shocker (Most seem to be Autococker, some bodies are Shocker)

Parts and Accessories:

New Designz:
Description: Screw thread: Screw type:
Trigger set screw threads 6-32 1/16" padded (nylon) hex socket
Shocker/Nerve trigger magnet cage threads 10-32
Vertical regulators:
Description: Screw thread: Screw type:
Manifold-style Impulse vertical reg, housing set screws (2) 10-32 x 1/8" 3/32" hex socket
Manifold-style Impulse vertical reg, adjustment endcap lock screw ? x ? socket head, ? hex socket
Shocker/Nerve vertical reg, housing set screws (1 or 2) 10-32 x 1/8" 3/32" hex socket
Note: This also includes the new-style Max-Flos that came on Impulses in 2005 and later.
NXT/Ion reg, endcap safety screw 4-40 x 6/32" 3/32" hex socket
NXT/Ion reg, spring platform set screw 10-32 x 1/8" 3/32" hex socket
Bottomline regulators:
Description: Screw thread: Screw type:
Max-Flo manifold, manifold clamp screws (4) 10-32 x 1/2" socket head, 5/32" hex socket
Max-Flo manifold, mounting bracket set screws (5) 10-32 x 1/8" 3/32" hex socket
Max-Flo manifold, adjustment endcap lock screw ? x ? socket head, ? hex socket
Max-Flo manifold, input seal threads ? ? hex stocket
Max-Flo Inline, manifold housing screws (4) 10-32 x 1.85" socket head, 5/32" hex socket
Max-Flo Inline, smartvalve retaining screw 4-40 x 5/8" 0.05" hex socket
Max-Flo Inline, adjustment endcap lock screw ? x ? socket head, ? hex socket
Max-Flo Micro, regulator housing set screws (2) ? x ? Dogbite set screw, 3/32" hex socket
SP S-rail set screws (2) 10-32 x 5/16" 3/32" hex socket
SP angle drop set screw 10-32 x 1/4" 3/32" hex socket
Parker K-series solenoid:
Description: Screw thread: Screw type:
Body mount screws (2) M1.6 x 0.35 x 16-mm button head, phillips
Endcap screws (2) M1.6 x 0.35 x 5-mm button head, phillips
Coil screws (2) M1.6 x 0.35 x 37-mm button head, phillips

Miscallaneous:

Description: Screw thread: Comments:
Bottomline screws (2) 10-32 x 1/2"+ Half-inch tends to be an average length;
other lengths will also work.
SP Q-lock screw threads 6-40 Speciality screw with a round head
SP Vertical feedneck threading 13/16-32 Used on Shocker Sport (00-02), Shocker
SFT (03-06), Impulse, Nerve, Ion/Epiphany,
ICD Bushmaster, PMI Piranha (new-style),
Omen, and Invert.
SP Ball detent threading 3/8-16 Not used on Ions, Shocker NXTs.
1/8" NPT air fittings 7/16-27
aka. 1/8"-27
For drilling, use size R drill for the NPT tap.
Standard HPA tank threads 5/8-18 class 2B Most tanks use these threads, however not all.
ASA threads 1/2 NPS Female threads only. The opposing male
threads are smaller to allow clearance.
Autococker barrel threads 15/16-20 Before drilling, bore diameter 0.88" to a depth
of 1.24" (what's what I do, anyway).
The exact diameter isn't that important.
Impulse/Ion barrel thread 15/16-12 double lead Spec
Shocker barrel thread 15/16-16 double lead Spec

Note about grip screws: The Shocker/Nerve/Ion stock length of 5/16" may damage circuit components within the frame if unusually thin grip panels are used (such as Hybrid, or Dye to a certain extent). I have found that a length of 3/16" is much better suited for the thin hybrids, or 1/4" for Dye grips. Washers can be used to space out longer screws.
Note about barrel threads: The exact profile of the threading may be different than the theoretical measurement (example 15/16-16 DL). This is due to the manufacturer compensating for anodizing layers (which add a layer of material and change the measurements). Generally 0.003-0.005" is added to the diameter to prevent the barrel from locking up.

Repairing Stripped Female Threads:
It appears to be a slight misconception that threads can be "retapped" for future use. In order to tap metal, there first needs to be metal to tap into in the first place. If the threads are stripped then that metal will have already been removed.
Because of this, when a thread is stripped out, you need to tap it for the next screw size larger. This can be a larger diameter screw or possibly the same screw with less threads-per-inch, if the new threads are substantially larger.

Speciality Taps / Thread-Cutting Methods:
Most screws used on markers are standard and can be bought in stores so you can tap yourself, by hand or by machine. However, the threads on larger holes are often "specialty" sizes, which are uncommon, and thus taps for them aren't made for the public to use. Taps to accomidate large threads like this are only custom-made for the manufacturer in large quantities so they can use them on their markers in production. Additionally, depending on the part, the company might not even use a tap for the hole. For instance, a Shocker SFT's barrel thread and bolt guide thread are cut into the body on a lathe while it is being machined, they don't use a tap for those parts of the gun.
Airsoldier.com does carry some specialty taps, such as Autococker threading and Angel feedneck threading, however other than that you won't be able to find a tap or die for specialty thread sizes.

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