Crushing

The C50L® HuckBolt® Fastening System
Strong and dependable lockbolts for heavy-duty, vibration-intensive applications.

Grade 5 fasteners certified to meet or exceed all ASTM A-325 standards.

F

or applications ranging from railcar to mining equipment manufacturing, C50L® HuckBolt® fasteners from Alcoa Fastening Systems offers superior vibration resistance and overall durability.Heavy-duty applications demand tough, reliable fasteners. And extensive testing has demonstrated that C50L HuckBolt fasteners meet or exceed the performance of torqued bolts in both shear and tensile strength (with a longer fatigue life). Value is built in, too. Over the lifetime of your product, the investment you make in the quality of C50L HuckBolt fasteners will pay for itself. While a single nut andbolt may cost less than a C50L fastener, you won’t find a more accurate installation today or a more reliable joint long term.
Successful, consistent installations Unlike threaded fasteners, the C50L HuckBolt fastener gives you consistent installation results with virtually no rework. High costs of

calibrating, maintaining, and replacing tools are eliminated. And unlike welding, installationof the C50L does not require expensive, highly experienced workers. In addition, the C50L HuckBolt fastening system is worker-friendly. It’s engineered to be installed without torquing or multiple impacts. Noise level is significantly reduced. And your installation area becomes quieter, less stressful, and more productive. Because the fasteners install without impact, heat, or fumes, you’ll enjoya safer, cleaner work environment. And ultimately, increase productivity and decrease costly employee turnover.

1


The pin is inserted into the prepared hole and the smooth bore collar is placed on the pin

C50L® HuckBolt®

Swaged-on collar forms a permanent, vibration-proof connection

Initial long length of fastener enables pull-out of large gaps

Repeatable pre-load remains thesame every time

2

The installation tool is applied to the pintail. When the tool is activated, the jaws in the nose assembly pull on the pintail and the nose anvil pushes on the collar to remove any gap.

3

The nose anvil starts to swage the collar into the lockgrooves on the pin. Continued swaging causes the collar to lengthen and develop clamp.

4

When swaging of the collar intothe lockgrooves is complete, the pintail separates from the pin which completes the installation cycle.


C50L® Huckbolt®
C A
B
min grip 90ϒ B ref

C

A

D

min grip

E

D

E

Round Head – C50LR
C A C

90° Flush Head – C50L90
A

B

B

min grip

D

min grip

E

D

E

Truss Head – C50LT

Large Truss Head – C50L30

Fastener Dimensions
Round HeadTruss Head C50LT Large Truss Head C50L30 90°Flush Head

Dia. 1/2 5/8 3/4 7/8

(16) (20) (24) (28)

A 0.515 - 0.493 0.642 - 0.617 0.768 - 0.741 0.895 - 0.866

B 59/64 1-9/64 1-3/8 1-19/32

C 5/16 25/64 15/32 35/64

B 59/64 1-9/64 1-3/8 1-19/32

C 15/64 19/64 23/64 13/32

B 1-3/32 1-3/8

C 17/64 21/64

B 29/32 1-5/32 1-3/81-19/32

C 1/4 5/16 3/8 7/16

Collar Dimensions
Collar LC 3LC 8LC
2 1

Diameter 1/2 5/8 3/4 7/8 1/2 5/8 3/4 7/8 1/2 5/8 3/4 7/8

F 0.515 - 0.540 0.650 - 0.665 0.775 - 0.790 0.910 - 0.935 0.515 - 0.535 0.650 - 0.665 0.775 - 0.790 0.910 - 0.930 0.515 - 0.535 0.650 - 0.665 0.775 - 0.790 0.910 - 0.930

G 0.800 - 0.765 1.010 -0.970 1.180 - 1.165 1.375 - 1.345 0.807 - 0.793 1.010 - 0.970 1.200 - 1.170 1.375 - 1.360 0.800 - 0.775 1.010 - 0.970 1.180 - 1.165 1.375 - 1.360

H 0.645 - 0.610 0.875 - 0.845 3 0.960 - 0.930 1.113 - 1.083 0.746 - 0.716 0.959 - 0.929 1.147 - .117 1 1.330 - .300 1 0.500 - 0.470 0.700 - 0.670 0.745 - 0.715 0.863 - 0.833

J

K

0.156 - 0.094 0.187 - 0.125...