Standard Sizes (44 options)
Popular Sizes
| Part # | Color | Bottom (in.) | Top (in.) | Length (in.) | Qty/Bag | Price/Bag | Add to Shopping List |
|---|---|---|---|---|---|---|---|
| STP99 | Clear | 0.031 | 0.125 | 0.625 | 1000 | $26.53 | |
| STP100 | Lt Green | 0.062 | 0.125 | 0.625 | 1000 | $26.53 | |
| STP101 | Pink | 0.062 | 0.187 | 0.625 | 1000 | $29.70 | |
| STP101XL | Dk Green | 0.062 | 0.187 | 0.750 | 1000 | $31.10 | |
| STP102 | Clear | 0.125 | 0.250 | 0.750 | 1000 | $39.09 | |
| STP102XL | Yellow | 0.125 | 0.250 | 1 | 1000 | $45.25 | |
| STP103 | Red | 0.187 | 0.343 | 0.625 | 1000 | $62.32 | |
| STP103XL | Clear | 0.187 | 0.343 | 1 | 1000 | $81.11 | |
| STP104 | Yellow | 0.250 | 0.375 | 0.750 | 100 | $7.81 | |
| STP104XL | Red | 0.250 | 0.437 | 1 | 100 | $13.33 | |
| STP105 | White | 0.250 | 0.375 | 0.500 | 100 | $9.33 | |
| STP105XL | Clear | 0.125 | 0.375 | 1.25 | 100 | $14.91 | |
| STP500XL | Clear | 0.125 | 0.500 | 2 | 100 | $24.94 | |
| STP106 | Dk Blue | 0.343 | 0.437 | 0.687 | 100 | $10.92 | |
| STP000 | Clear | 0.343 | 0.468 | 0.813 | 100 | $19.53 | |
| STP000XL | Pink | 0.312 | 0.500 | 1 | 100 | $17.85 | |
| STP107 | Yellow | 0.375 | 0.562 | 1 | 100 | $18.72 | |
| STP00 | Red | 0.406 | 0.593 | 1 | 100 | $21.21 | |
| STP108 | Clear | 0.437 | 0.625 | 0.812 | 100 | $31.10 | |
| STP0 | Pink | 0.500 | 0.656 | 1 | 100 | $24.94 | |
| STP1 | Clear | 0.562 | 0.748 | 1 | 100 | $28.00 | |
| STP2 | Red | 0.625 | 0.787 | 1 | 100 | $35.96 | |
| STP3 | Yellow | 0.718 | 0.937 | 1 | 100 | $53.03 | |
| STP4 | Clear | 0.781 | 1 | 1 | 100 | $54.30 | |
| STP5 | Lt Green | 0.906 | 1.062 | 1 | 100 | $59.25 | |
| STP5.5 | Clear | 0.937 | 1.100 | 1 | 100 | $67.06 | |
| STP6 | Grey | 1.031 | 1.25 | 1 | 100 | $73.25 | |
| STP6.5 | Dk Green | 1.062 | 1.312 | 1 | 100 | $98.31 | |
| STP7 | Red | 1.187 | 1.437 | 1 | 50 | $48.35 | |
| STP7.5 | Clear | 1.250 | 1.531 | 1 | 50 | $73.39 | |
| STP8 | Clear | 1.312 | 1.625 | 1 | 50 | $70.15 | |
| STP8.5 | Clear | 1.406 | 1.687 | 1 | 50 | $87.25 | |
| STP9 | Red | 1.468 | 1.75 | 1 | 50 | $90.35 | |
| STP9.5 | Clear | 1.500 | 1.812 | 1 | 50 | $95.20 | |
| STP10 | Clear | 1.625 | 1.969 | 1 | 50 | $104.50 | |
| STP10.5 | Clear | 1.750 | 2.062 | 1 | 50 | $124.70 | |
| STP11 | Dk Blue | 1.875 | 2.203 | 1 | 10 | $23.37 | |
| STP11.5 | Clear | 1.968 | 2.468 | 1 | 10 | $24.92 | |
| STP12 | Clear | 2.125 | 2.50 | 1 | 10 | $33.94 | |
| STP13 | Clear | 2.281 | 2.687 | 1 | 10 | $34.47 | |
| STP13.5 | Clear | 2.437 | 2.968 | 1.375 | 10 | $46.66 | |
| STP14 | Clear | 3 | 3.50 | 1.50 | 1 | $8.63 | |
| STP15 | Clear | 3.25 | 4 | 1.50 | 1 | $14.03 | |
| STP16 | Clear | 3.50 | 5 | 2 | 1 | $21.78 |
Technical Specifications
Properties
Application Tips
Plug Positioning
Sizing Guide
Plug Positioning
Most often a tapered plug is used to plug blind holes that do not go all the way through a part. Ideally, the plug should rest 1/3 to 1/2 way down into the hole at insertion, for best 'hold' when pushed or twisted in place and for sufficient plug left above for easy removal.
Sizing Guide
When trying to find the best plug for a given hole size, use these general guidelines: Bottom diameter should be 15% smaller than hole diameter; top diameter should be 15% larger than hole diameter.
Need a custom plug or cap?
We provide custom masking for powder coating, anodizing, plating and more.
- EPDM, silicone, FKM, Neoprene & other materials available
- Capable of handling small & large quantities
- Single cavity tooling for prototypes or small quantities
- Multi-cavity production tooling for large quantities
- Design Engineer on staff to assist with custom masking needs
Related Products
Series: STP-H
Silicone Tapered Plugs with Handle
The added length from the handle compared to our regular STP plugs allows for fingers large and small to quickly grasp the handle and insert/remove these smaller plugs. The handle also allows a quick twist to push plugs in a bit further and with more friction, helping to avoid blowouts in components that are heated and trap air beneath the plugs.
Series: VTMP
Silicone First Thread Masking Plugs with Handle
Masking plugs for SAE, UNC or metric threads where the first thread must also be masked. Ideal for powder coating, anodizing or other metal finishing. Viadon's Silicone First Thread Masking Plugs have a handle to make insertion and removal quick and easy in threaded blind holes. These plugs are specifically designed for the most common thread sizes, and we carry the most popular ones from 6-32 & M4 through other common sizes like 1/4-20 and M10 even up to M20. The straight wall of the plug section stays firmly in place, sized specifically for internal thread dimension. The top flange neatly masks off the lead thread of a hole, for perfectly masked threaded holes every time. Choose the ideal masking plugs for your needs with Viadon's handy cross-reference chart: Masking Plugs For Threaded Holes Chart.
Series: SFP
Silicone Flangeless Plugs
Especially well suited for threaded holes — can be twisted into blind, threaded holes tightly with the ribs holding the plug more securely. Color-coded for easy identification. Rated to 600°F. Compared to standard tapered plugs, they can be twisted into blind, threaded holes tightly with the ribs holding the plug more securely. This can be extremely useful when a strong seal is required to prevent leaks in anodizing or blow-outs in powder coating or ecoating. The shallow taper and narrow handle allow for complete masking while reducing shadowing during coating. SFP's are easy to insert and remove and are re-usable.
Series: VMFP
Silicone Multi-Flange Plugs
Multi-Flange Plugs (VMFP's) are a great option when the priority is being able to mask as many different holes sizes with a small inventory of plugs. Perfect for small powder coaters and job shops, these plugs allow for masking holes from 0.109" up to 0.709" with just three different plug sizes. With regular tapered plugs, that would take up to 15 plugs or more. Multi-flange plugs have a progressively larger tapered flanges on them, so they can be used for masking chamfers in threaded holes, or for the first thread in threaded holes that tapered plugs can't.