Skip to content

1 (855) 928-4024

0

Tubing
Tubing
Shop All Tubing
Kits
Kits
Shop All Kits
Fittings
Fittings
Shop All Fittings
Tools & Accessories
Tools & Accessories
Shop All Tools & Accessories
Lubricants
Lubricants
Shop All Lubricants
Specialty Fluids
Specialty Fluids
Shop All Specialty Fluids
Starters & Alternators
Starters & Alternators
- Starters
- Alternators
Shop All Starters & Alternators
Closeout Sale
Shop All

Shop

Tubing
Kits
Lubricants
Tools & Accessories
Specialty Fluids
Starters & Alternators
Fittings
Shop All

Company

About
Shipping & Returns
Terms of Service
Privacy Policy

1 (855) 928-4024

Lifetime Warranty

Trusted Shops

Knowledge Garage

Log in / Sign up

Anchor for skip content

Page overlay

Brake Line Fittings

Home / Brake Line Fittings

Brake Line Fittings – Adapters, Tube Nuts, Unions & More
Find the right connection with 4Lifetime’s high-quality fittings. From bleeder screws and adapters to tube nuts, unions, and compression fittings—our collection is built for tight, leak-free performance in automotive, industrial, and DIY applications. Durable. Reliable. Trusted.

$0

$85

Female 3/8"-24 Inverted"
Female 7/16"-24 Inverted"
Female M10x1.0 Inverted"

Male 1/2"-20 Inverted"
Male 3/8"-24 Bubble"
Male 3/8"-24 Inverted"
Male 7/16"-24 Inverted"
Male 9/16"-18 Inverted"
Male 9/16"-20 Inverted"
Male M10x1.0 Bubble"
Male M10x1.0 Inverted"
Male M11x1.50 Bubble"
Male M12x1.0 Bubble"
Male M13x1.50 Bubble"

Bubble Flare
Inverted Flare

90 Degrees
Straight

Black Oxide Coated Steel
Brass
Nylon
Stainless Steel
Steel

Adapter
Bleeder Screw
Compression Union
Fuel Line Quick Connect
Oil Drain Plug
Oil Drain Plug Gasket
Other
Plug
Tube Nut
Union

0.92mm
1.18mm
1.25mm
1.49mm
29.2mm
29.7mm
30.2mm
32.8mm
33.1mm
35.1mm
35.8mm
38.5mm
38.8mm

5/16"
3/8"
1/2"

1/4"
5/16"
3/8"
1/2"
12mm

1/2"-20
1/4""-28"
3/8""-24"
7/16""-24"
1/2""-20"
9/16""-18"
5/8""-18"
3/4""-16"
M7x1.0"
M8x1.0"
M8x1.25"
M10x1.0"
M10x1.25"
M10x1.50"
M11x1.50"
M12x1.0"
M12x1.25"
M12x1.50"
M12x1.75"
M13x1.50"
M14x1.25"
M14x1.5"
M14x1.50"
M16x1.5"
M16x1.50"
M18x1.50"
M20x1.50"
M22x1.50"
M26x1.50"

3/16"
1/4"
5/16"
3/8"
1/2"
1/8]
6mm
10mm

Showing 1 — 16 of 209 Products

Sort by

Showing 1 — 16 of 209 Products

Fitting Assortment 3/16" - 4LifetimeLines LTA316140

Fitting Assortment

4.3

Rated 4.3 out of 5 stars

7 Reviews

3/16" & 1/4" Fitting Assortment | 32 SKU

$84.99

3/16" (3/8-24 Inverted) | Tube Nut | Stainless Steel | 10ct - 4LifetimeLines

Brake Line Fitting

5.0

Rated 5.0 out of 5 stars

4 Reviews

3/16" (3/8-24 Inverted) | Tube Nut | Stainless Steel | 10ct

$9.99

3/16" ( 3/8-24 Inverted) | Steel Tube Nut | 10ct - 4LifetimeLines

Brake Line Fitting

3.0

Rated 3.0 out of 5 stars

2 Reviews

3/16" (3/8-24 Inverted) | Steel Tube Nut | 10ct

$7.99

3/16" 3/8-24 Inverted | Brass Brake Line Union | 10ct - 4LifetimeLines

Brake Line Fitting

5.0

Rated 5.0 out of 5 stars

4 Reviews

3/16" 3/8-24 Inverted Brass Brake Line Union | 10ct

$6.99

Sale

Nylon Tool 3/16" - 4LifetimeLines LTBC316

Tool

4.4

Rated 4.4 out of 5 stars

5 Reviews

3/16" Brake Line Tubing Clamp | Single Slot | Bag of 10

^$6.99 $5.29

3/16" Brake Line Fitting Assortment | 24 SKU - 4LifetimeLines

Fitting Assortment

4.8

Rated 4.8 out of 5 stars

6 Reviews

3/16" Brake Line Fitting Assortment | 24 SKU

$46.99

3/16" Metric 10x1.0 Bubble | Steel Tube Nut | 10ct - 4LifetimeLines

Brake Line Fitting

5.0

Rated 5.0 out of 5 stars

1 Review

3/16" Metric 10x1.0 Bubble | Steel Tube Nut | 10ct

$8.99

3/16" (M10x1.0 Inverted) | Tube Nut | Stainless Steel | 10ct - 4LifetimeLines

Brake Line Fitting

5.0

Rated 5.0 out of 5 stars

2 Reviews

3/16" (M10x1.0 Inverted) Stainless Steel Tube Nut | 10ct

$11.99

Black Oxide Coated Steel Brake Line Fitting 3/16" Compression Union - 4LifetimeLines LTHPCF316

Brake Line Fitting

5.0

Rated 5.0 out of 5 stars

1 Review

High Pressure Compression Fitting Union | 3/16" | Bag of 1

$3.99

3/16" (3/8-24 Inverted), Long | Steel Tube Nut | 10ct - 4LifetimeLines

Brake Line Fitting

3/16" (3/8-24 Inverted), Long Steel Tube Nut | 10ct

$7.99

3/16" | Brass Compression Union | 10ct - 4LifetimeLines

Brake Line Fitting

5.0

Rated 5.0 out of 5 stars

6 Reviews

3/16" | Brass Compression Union | 10ct

$8.99

3/16" (M10x1.0 Bubble) | Tube Nut | Stainless Steel | 10ct - 4LifetimeLines

Brake Line Fitting

4.8

Rated 4.8 out of 5 stars

5 Reviews

3/16" (M10x1.0 Bubble) Stainless Steel Tube Nuts | 10ct

$10.99

3/8" (5/8-18 Inverted) | Steel Tube Nut | 10ct - 4LifetimeLines

Brake Line Fitting

5.0

Rated 5.0 out of 5 stars

1 Review

3/16" (M10x1.0 Inverted) Steel Tube Nut | 10ct

$9.99

1/4" | Brass Compression Union | 10ct - 4LifetimeLines

Brake Line Fitting

5.0

Rated 5.0 out of 5 stars

3 Reviews

1/4" Brass Compression Union | 10ct

$9.99

(3/8-24 Inverted) | Brass Brake Line Union Tee | 10ct - 4LifetimeLines

Brake Line Fitting

5.0

Rated 5.0 out of 5 stars

4 Reviews

(3/8-24 Inverted) | Brass Brake Line Union Tee | 10ct

$9.99

3/8" (5/8-18 Inverted) | Steel Tube Nut | 10ct - 4LifetimeLines

Brake Line Fitting

5.0

Rated 5.0 out of 5 stars

2 Reviews

1/4" (7/16-24 Inverted) Steel Tube Nut | 10ct

$6.99

Free Delivery

For all orders over $50

Easy Returns

Risk-free returns

Secure Checkout

100% protected payments

Loyalty Rewards

Built for the pros who keep coming back

Contact Us Shipping & Returns Warranty Submit an Idea

hello@4lifetimelines.com

251 Little Falls Drive
Wilmington, DE 19808

Shop

Shop All
Tubing
Fittings
Lubricants

Company

About
Knowledge Garage
Frequently Asked Questions
Customer Service
Privacy Policy
Terms of Service

Subscribe to newsletter

Sign up to receive interesting news and be the first to know about updates and promotions

You are already subscribed

© 2026, 4LifetimeLines. All Rights Reserved

One or more of the items in your cart is a deferred, subscription, or recurring purchase. By continuing, I agree to the cancellation policy and authorize you to charge my payment method at the prices, frequency and dates listed on this page until my order is fulfilled or I cancel, if permitted.