Loctite 638 high-strength general-purpose retaining adhesive green
SKU: LT01174
- Regular price
- $41.16
- Sale price
- $41.16
- Regular price
-
Detailed product description
Product Introduction
Loctite 638 is designed for the bonding of cylindrical fittings, especially where key gaps can approach 0.25 mm Maximum strength at room temperature is required. The product cures shock and vibration when enclosed between tightly fitting metal surfaces and prevents loosening and leakage without air. Loctite 638 provides powerful curing properties. It is not only suitable for active metals such as mild steel, but also for passive metals such as stainless steel and substrates such as plated surfaces. Products offer high temperature performance and oil resistance. It tolerates minor surface contamination from a variety of oils, such as cutting, lubricating, anti-corrosive and protective fluids. Typical applications include locking bushings and sleeves to housings and shafts.
Product technical parameters.
| Manufacturer | Loctite |
| Product model # | Loctite 638 |
| Manufacturer number | 1835936 1835925 |
| Color appearance | Green |
| Chemical composition | Methacrylate |
| Component | Single component |
| Curing method | Anaerobic curing |
| Cure time | 72 h |
| Flashpoint | 93℃ |
| Gap filling | 0.2 mm |
| Shear strength | 1960 to 3625 @22℃ |
| Proportion | 1.1 @ 25°C |
| Viscosity | 2000-3000 m·Pas @25℃ |
- Typical Environmental Resistance Test Results
- Chemical/Solvent Resistance Test Results
- Thermal aging test results
Spec // as published by the manufacturer
At a glance
- Product type
- Anaerobic
- Brand
- Loctite®
- Viscosity band
- 500-2500
Substrates in scope
Declared by manufacturer
Values are as published by the manufacturer for this grade. They describe the product family, not a test report for your assembly — ask us for the current data sheet before you design against them.
Same family
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View gradeRelated reading
Before you specify it
Technical writing from our engineering team and from the manufacturers we carry.
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ReadWhat you get with the material
We are not just shipping you a drum
A grade on its own rarely solves the problem. These are the four things we do around it.
Selection support
Tell us the substrates, the process window and the failure you are trying to avoid. We narrow the field before you order anything.
Process designPrototyping and pilot runs
Bonded samples and pilot batches of 200–500 pcs on our own dispensing and curing equipment, so process questions are answered before mass production.
Prototyping & pilotCross-border supply, DDP
Destination clearance, local labelling and destination-language SDS are set up by us. Class-restricted goods are routed at quotation time, not discovered at the border.
Cross-border supplyDocumentation chain
Which document, issued by whom, covering what, and notification when it changes. We pass manufacturer documentation through unchanged.
Material substitutionCommon questions
Before you send the enquiry
Yes. Tell us the grade and how you intend to use it, and we will send the manufacturer’s current technical data sheet. We pass manufacturer documentation through unchanged rather than reissuing it under our own name.
No — and you should be careful with anyone in our position who says they do. What we supply is the document chain: which document exists, who issued it, what it covers, and notification when it changes. Compliance statements come from the manufacturer, not from us.
That is one of the most common reasons engineers contact us. Equivalence is a ladder, not a yes/no answer — some claims are backed by a matching data sheet, others only by chemistry family. We will tell you which rung a given substitution sits on before you commit to it.
Packaging sizes shown on this page are the standard units for this grade. Sample quantities for evaluation are handled case by case — tell us the trial you are planning and we will scope it with you.
Tell us what you are bonding
Substrates, process window, and the failure you are trying to design out. An engineer answers, not a form.
We do not issue compliance certificates. We supply the material, the manufacturer’s documentation, and the engineering judgement in between.