Masking Plugs
High-Quality Thread Masking Plugs
Protect Your Products During Any Finishing Process
North Coast Seal offers high-quality tapered masking plugs for applications. If you are looking to protect holes, threads, or counterbores during any finishing process—including electroplating, anodizing, dipping, painting, or deburring, you need a low-cost, easy-application solution. That’s where our thread masking plugs come in. Made of durable, high-quality materials including neoprene, cork, and NSF-certified silicone, masking pull plugs from North Coast Seal will protect your product’s threaded and non-threaded through holes during any high-temperature application.
Why Choose NCS Masking Plugs?
High-Temperature Resistance and Durability
You need plugs that will resist the conditions encountered during finishing.
- High-temperature resistance and durability
- Molded in specially developed, high-strength materials
- Solutions ideal for automotive, electronic, and medical applications
- Can be used many times—not just once—making them cost-effective
Find Your Hole Masking Plug
View Standard Stock Sizes
We offer two types of masking plugs: tapered hole masks for bottomed holes and pull-through hole masks for through holes. As you view our available sizes below, select the size that most closely matches the diameter of the hole you want to plug. Ideally, masking plugs will be oversized slightly to effectively mask off the hole.
Tapered Hole Masks for Bottomed Holes
| Size | M | P | L |
|---|---|---|---|
| 915-112 | .112 | .046 | .465 |
| 915-125 | .125 | .031 | .650 |
| 915-135 | .135 | .085 | .386 |
| 915-160 | .160 | .100 | .390 |
| 915-200 | .200 | .115 | .475 |
| 915-188 | .215 | .118 | .375 |
| 915-250 | .250 | .060 | .500 |
| 915-249 | .250 | .063 | .750 |
| 915-251 | .250 | .125 | .530 |
| 915-313 | .313 | .187 | .530 |
| 915-314* | .314 | .187 | 1.030 |
| 915-370 | .370 | .260 | .730 |
| 915-430 | .430 | .320 | .730 |
| 915-570* | .570 | .381 | 1.500 |
| 915-750 | .750 | .375 | .875 |
| 915-1.188 | 1.188 | .812 | 1.00 |
| 915-1.615 | 1.615 | 1.300 | 1.000 |
| 915-1.626 | 1.625 | 1.125 | 1.120 |
| 915-1.625 | 1.625 | 1.125 | 1.120 |
| 915-2.086 | 2.086 | 1.775 | 1.030 |
| 915-2.137 | 2.137 | 2.072 | 1.500 |
| 915-2.250 | 2.250 | 1.950 | 1.000 |
| 915-2.570 | 2.570 | 2.070 | 1.030 |
| 915-2.610 | 2.610 | 2.300 | 1.000 |
| 915-3.070 | 3.070 | 2.440 | 1.375 |
| 915-4.188 | 4.188 | 3.500 | 1.500 |
Pull Through Hole Masks for Through Holes
| Size | M | P | L | T | E |
|---|---|---|---|---|---|
| 927-055 | .055 | .035 | .563 | .563 | 1.125 |
| 927-060 | .060 | .035 | .563 | .563 | 1.125 |
| 927-069 | .067 | .047 | .625 | .625 | 1.250 |
| 927-090 | .090 | .047 | .625 | .625 | 1.250 |
| 927-093 | .091 | .062 | .875 | .875 | 1.750 |
| 927-107 | .104 | .062 | .625 | .625 | 1.250 |
| 927-105 | .105 | .075 | .875 | .875 | 1.750 |
| 927-125 | .121 | .062 | .625 | .625 | 1.250 |
| 927-137 | .137 | .110 | .875 | .875 | 1.750 |
| 927-145 | .145 | .095 | .250 | .370 | .620 |
| 927-150 | .150 | .120 | 1.125 | 1.125 | 2.250 |
| 927-157 | .154 | .091 | .375 | .375 | .750 |
| 927-166 | .162 | .093 | .625 | .625 | 1.250 |
| 927-181 | .181 | .125 | 1.000 | 1.000 | 2.000 |
| 927-195 | .195 | .110 | .625 | .625 | 1.250 |
| 927-225 | .225 | .125 | .625 | .625 | 1.250 |
| 927-226 | .226 | .125 | 1.324 | 1.464 | 2.788 |
| 927-250 | .245 | .193 | .500 | .500 | 1.000 |
| 927-260 | .257 | .130 | .625 | .625 | 1.250 |
| 927-284 | .287 | .160 | 1.150 | 1.150 | 2.300 |
| 927-312 | .310 | .147 | .625 | .625 | 1.250 |
| 927-335 | .335 | .157 | .625 | .625 | 1.250 |
| 927-370 | .370 | .250 | 1.150 | 1.438 | 2.588 |
| .927-388 | .388 | .157 | .625 | .625 | 1.250 |
| 927-414 | .414 | .157 | .625 | .625 | 1.250 |
| 927-441 | .440 | .200 | .875 | .875 | 2.000 |
| 927-445 | .445 | .157 | .625 | .625 | 1.250 |
| 927-496 | .496 | .187 | .625 | .625 | 1.250 |
| 927-510 | .510 | .187 | .625 | .625 | 1.250 |
| 927-620 | .620 | .250 | .875 | .875 | 1.750 |
| 927-751 | .750 | .375 | .950 | 1.062 | 2.012 |
| 927-765 | .765 | .200 | .625 | .625 | 1.250 |
Do you have questions about our available sizes or need assistance with determining the right size masking plug for your application? Our team can help.
Specialty Applications for Masking Plugs
You Name It, We’ll Make It!
Looking for an even higher heat or chemical resistance? NCS can mold your masking plugs in one of our more than 9,000 chemical compounds, including NSF 51 and 61 certified materials, to produce the mask that will work best for you. Work directly with our team to find the compound suited best to your needs.