

🔩 Lock it tight, seal it right — don’t let leaks steal your edge!
Loctite 37482 545 is a 36 ml high-performance pneumatic and hydraulic thread sealant trusted by professionals for locking and sealing high-pressure systems. Its contaminant-free formula prevents fluid contamination and valve fouling, curing reliably on untreated fasteners. Ideal for hydraulic, brake, transmission, and PTO fittings, it delivers OEM-approved, leak-proof performance in a compact, easy-to-use bottle.

| ASIN | B003XZB54O |
| Best Sellers Rank | #5,455 in Automotive ( See Top 100 in Automotive ) #23 in Thread Lock Sealers #376 in Oils & Fluids |
| Brand | Loctite |
| Brand Name | Loctite |
| Color | Purple |
| Compatible Material | Metal |
| Customer Reviews | 4.7 out of 5 stars 972 Reviews |
| Global Trade Identification Number | 00079340374829 |
| Included Components | (1) LOCTITE 545 Pneumatic/Hydraulic Pipe Thread Sealant | Purple, 36 ml Bottle |
| Item Dimensions | 6.25 x 2.25 x 1.1 inches |
| Item Form | Liquid |
| Item Height | 1.1 inches |
| Item Type Name | automotive-thread-lock-sealers |
| Item Weight | 1.6 ounces |
| Item dimensions L x W x H | 6.25 x 2.25 x 1.1 inches |
| Manufacturer | Loctite |
| Material | Sealant |
| Material Type | Sealant |
| Style | Industrial |
| Style Name | Industrial |
| Surface Recommendation | Miscellaneous |
| UPC | 079340374829 |
| Unit Count | 1.21 Fluid Ounces |
| Water Resistance Level | Not Water Resistant |
A**R
Good tread loc sealant
Great product for thread loc sealer. Used on Cummins engine works great. Had good price with Amazon.
K**N
Works great
I was a pipefitter for 36 years and couldn’t count how many screw joints I have made. This pipe joint compound works great. I used it on a hydraulic log splitter on all of the joints, fired it up and did not have any leaks at all. Very impressive
A**R
Made what I though impossible come true!
Just got done using the Loctite 545 with primer 7471 (Required with stainless steel) and also used 5452 (Gel Version, No primer required) and they are awesome. What "I" key word "I" as a novice could not do with teflon tape and pipe dope these products were able to. Not only do they seal really well, but they also create a tight bond like other loctite glues. Again, these two products are specifically designed for Pneumatic use. IMOP, they are very expensive and not practical for everyday useI on a job site. I just got tired of taking my airline pipes, cleaning with wire brush and acetone and reassembling/assembling multipule times. I would like
N**.
Perfect sealant for my methanol fuel lines
I used this Loctite 545 on all the fittings in my methanol fuel line setup for my project, and it has been absolutely flawless. Not a single leak anywhere. It applies clean, seals perfectly, and holds strong even under vibration and pressure. This product gave me total confidence in my fuel system, and I definitely won’t stop using it. If you’re working with methanol or high-performance setups, this sealant is a must-have. Highly recommended!
F**E
good stuff!
works fine to seal fittings of my 6 x 4 bandsaw hydraulic downfeed control piston.
C**O
Great alternative to teflon tape, has applications where tape simply won't work
This is an incredible alternative to teflon tape. There are times that the tape is too wide for some threads, and the liquid threat helps tremendously. I did try to use this for a shower head, it did not work. It's not advertised for use with low viscosity liquid(hydraulic fluid is more viscous vs water) but it was worth the attempt. You're also supposed to use yellow teflon tape for gas applications, which is not widely known. Regardless, this is a great product and I recommend.
J**M
Extra peace of mind for brake fittings
I recently had a brake line rupture on an older vehicle that resulted in a potentially fatal near miss. It was a real wakeup call. When I replaced the entire braking system, I decided to pay close attention to every detail and use quality parts. I used this product on every fitting, and unlike Teflon tape, which is arguably an amateur's hack, this is made for the application. Of course, it's for many hydraulic applications, but when a braking system is so critical to your safety, your family's safety, and everyone else's, why mess around? Do it right.
A**R
Compressor repair
I used the Locite 545 to repair an old air compressor. Working well so far.
Trustpilot
3 days ago
1 month ago