AL Type – Aluminum Jaw Coupling
- Lightweight aluminum version of the industry standard shaft coupling
- Interchangeable with L and SS line of hubs (except AL150)
- Corrosion resistant (finished bores passivated for additional protection)
- Accommodates for angular and parallel shaft misalignment
- Fail-safe – will still perform if elastomer “spider” fails
- No metal to metal contact
- Resistant to oil, dirt, sand, moisture, and grease
AL Type – Aluminum Jaw Coupling Additional Resources
Click here to access Lovejoy’s Digital Parts Catalog for AL Type components.
A full AL Type coupling is comprised of 3 parts:
- 2 aluminum hubs (with set screw)
- 1 elastomer spider (SOX, Urethane, Hytrel®, or Bronze)
|
Max Bore |
Spider Material |
|||||||||
|
SOX (NBR) |
Urethane |
Hytrel® |
Bronze |
|||||||
|
Size |
in |
mm |
in-lbs |
Nm |
in-lbs |
Nm |
in-lbs |
Nm |
in-lbs |
Nm |
|
AL050 |
0.625 |
16 |
26.3 |
3 |
39 |
4.5 |
50 |
5.6 |
50 |
5.6 |
|
AL070 |
0.75 |
19 |
43.2 |
4.9 |
65 |
7.3 |
114 |
12.9 |
114 |
12.9 |
|
AL075 |
0.875 |
22 |
90 |
10.2 |
135 |
15.3 |
227 |
25.6 |
227 |
25.6 |
|
AL090 |
1 |
25 |
144 |
16.3 |
216 |
24.4 |
401 |
45.3 |
401 |
45.3 |
|
AL095 |
1.125 |
28 |
194 |
21.9 |
291 |
32.9 |
561 |
63.4 |
561 |
63.4 |
|
AL099 |
1.188 |
30 |
318 |
35.9 |
477 |
53.9 |
792 |
89.5 |
792 |
89.5 |
|
AL100 |
1.375 |
35 |
417 |
47.1 |
626 |
70.7 |
1,134 |
128 |
1,134 |
128 |
|
AL110 |
1.625 |
42 |
792 |
89.5 |
1,188 |
134 |
2,268 |
256 |
2,268 |
256 |
|
AL150 |
1.875 |
48 |
1,450 |
163.8 |
— |
— |
— |
— |
— |
— |
Note: Bronze has a maximum RPM capability of 250 RPM.
SOX (NBR) Rubber (Standard Insert) – Nitrile Butadiene (Buna N) Rubber is a flexible elastomer material that is oil resistant, resembles natural rubber in resilience and elasticity.
Urethane – Greater torque capability than NBR (1.5 times), provides less dampening effect, and operates in a smaller temperature range. Good resistance to oil and chemicals. Not recommended for cyclic or start/stop applications.
Hytrel® – Flexible elastomer designed for high torque and high temperature operations. Excellent resistance to oil and chemicals. Not recommended for cyclic or start/stop applications.
Bronze – Rigid, porous oil-impregnated metal insert exclusively for low speed (max 250 RPM) applications requiring high torque capabilities. Not affected by extreme temperatures, water, oil, or dirt.
|
Material |
Temperature |
Misalignment |
Shore |
Dampening |
Chemical |
Color |
|
|
|
|
Angular |
Parallel |
||||
| SOX (NBR) Rubber |
-40°F to 212°F |
1° |
0.015 |
80A or 60A* |
High |
Good |
Black |
| Urethane |
-30°F to 160°F |
1° |
0.015 |
55D or 90-95A** |
Low |
Very Good |
Blue |
| Hytrel® |
-60°F to 250°F |
1/2° |
0.015 |
55D |
Low |
Excellent |
Tan |
| Bronze |
-40°F to 450°F |
1/2° |
0.01 |
– |
None |
Excellent |
Bronze |
* All Sizes (except L035) shore hardness = 80A, Size L035 shore hardness = 60A
** Sizes L050 to L110 shore hardness = 55D, Sizes L150 to L225 shore hardness = 90-95A
Note: In addition to solid center spiders (most common), open center spiders are also available (to allow shafts of the driver and driven to be positioned within a short distance). Open center spiders offer shaft positioning flexibility but have a lower RPM capacity (1,750 RPM maximum for NBR, 3,600 maximum for Urethane and Hytrel®).
- For Standard or Stainless Steel: see L Type or SS Type
- For Radial Removable Spiders: see SW Type or LC Type
- For Radial Removable w/ Spacer: see RRS/RRSC Type
- For Non-Fail Safe: see Jaw-In-Shear Type
- For Backlash Free: see Curved Jaw – GS Type
- For European Standard: see Curved Jaw – CJ Type
- Or, for other coupling types: see Coupling Preselection Guide
- For a broad overview on Lovejoy jaw couplings, please consider reading: Jaw Coupling Overview – Features & Benefits, Design Basics, and Element Options.
- While Lovejoy jaw couplings are designed to handle a lot of abuse, the jaw coupling elastomeric spider is a wearing element that will eventually need to be replaced. To review how and why jaw couplings wear out, please read: Coupling Failure Analysis – Jaw Couplings (includes hub & spider photos).
- Estimating the life of a jaw coupling is difficult as it is application specific. To dive deeper into this question, check out: Jaw Coupling Question – “How Much Life Can I Expect Out of the Spider”.
- And, because it has an interesting back story and is a fairly common question we get asked: What do Lovejoy jaw coupling numerical sizes stand for?