C50L
Grade 2 Fasteners that resist loosening
The shear strength of the C50L fastening system is reason enough to specify it for heavy duty, high vibration applications. It can be used with confidence because the C50L Huckbolt fastener is designed to meet or exceed SAE grade 5 or ASTM A-325 strength requirements satisfying high pre-load, tensile strength and shear strength.
Fastener Dimensions
| Dia. | A | Round Head B |
C | Truss Head C50LT B |
C | Truss Head C50L30 B |
C | 90° Flush Head B |
C |
| 1/2 (16) | .515 - .493 | 59/64 | 5/16 | 59/64 | 15/64 | 1 3/32 | 17/64 | 29/32 | 1/4 |
| 5/8 (20) | .642 - .617 | 1 9/64 | 25/64 | 1 9/64 | 19/64 | 1 3/8 | 21/64 | 1 5/32 | 5/16 |
| 3/4 (24) | .768 - .741 | 1 3/8 | 15/32 | 1 3/8 | 23/64 | 1 3/8 | 3/8 | ||
| 7/8 (28) | .895 - .866 | 1 19/32 | 35/64 | 1 19/32 | 13/32 | 1 19/32 | 7/16 | ||
| 1 (32) | 1.022 - .990 | 1 53/64 | 39/64 | 1 53/64 | 15/32 | 1 27/32 | 1/2 | ||
| 1 1/8 (36) | 1.149 - 1.098 | 2 1/16 | 11/16 | ||||||
| 1 3/8 | - See RamBolt for specifications. | ||||||||
Installed Fastener Values *1
| Dia. | Carbon Steel Pins LC-2R or 3LC-2R Collars Shear |
Clamp | Tensile | 2024 Aluminum Pins LC-F or 3LC-F Collars Shear |
Clamp | Tensile | 6061 Aluminum Pins LC-1 or 3LC-1 Collars Shear |
Clamp | Tensile | CRES Pins LC-2CU or 3LC-2CU Collars Shear |
Clamp | Tensile |
| 1/2 | 14400 | 12050 | 17050 | 7300 | 5900 | 7850 | 5300 | 4400 | 4900 | 13900 | 12050 | 17050 |
| 5/8 | 22500 | 19200 | 27100 | 11400 | 9200 | 12300 | 8300 | 6900 | 7670 | 21000 | 19200 | 27100 |
| 3/4 | 32400 | 28400 | 40100 | 16400 | 13300 | 17700 | 11900 | 9950 | 11040 | 30300 | 28400 | 40100 |
| 7/8 | 43400 | 39250 | 55450 | |||||||||
| 1 | 56500 | 51500 | 72700 | |||||||||
| 1 1/8 | 69500 | 58450 | 82950 | |||||||||
| 1 3/8 | -See RamBolt for specifications. | |||||||||||
*1 Minimum values, in pounds, of installed fasteners. Round head, in carbon steel equivalent to ASTM A325 high strength bolts. Meets requirements of MIL-P-23469.
Grip Data and Dimensions
Grip is the actual thickness of material to be fastened. Grip includes ‘C’ dimension on 90° flush head and 60° watertight fasteners. Grips listed are not necessarily available in every head style. Contact HUCK for grips not shown. Tolerances: Dimension D +- 1/32, Dimension E + 3/16, -1/16
| Grip No. | Grip Range min-max |
1/2" Diameter (-16) D |
E | 5/8" Diameter (-20) D |
E | 3/4" Diameter (-24) D |
E | 7/8" Diameter (-28) D |
E | 1" Diameter (-32) D |
E | 1 1/8" Diameter (-36) D |
E |
| 4 | 1/4 - 1/2 | 1.213 | 3 11/64 | 1.433 | 3 21/32 | 1.518 | 4 5/32 | ||||||
| 8 | 1-2 - 3/4 | 1.463 | 3 27/64 | 1.683 | 3 29/32 | 1.768 | 4 13/32 | 1.921 | 4 11/16 | 2.073 | 5 3/8 | ||
| 12 | 3/4 - 1 | 1.713 | 3 43/64 | 1.933 | 4 5/32 | 2.018 | 4 21/32 | 2.171 | 4 15/16 | 2.323 | 5 5/8 | ||
| 16 | 1 - 1 1/4 | 1.963 | 3 59/64 | 2.183 | 4 13/32 | 2.268 | 4 29/32 | 2.421 | 5 3/16 | 2.573 | 5 7/8 | ||
| 20 | 1 1/4 - 1 1/2 | 2.213 | 4 11/64 | 2.433 | 4 21/32 | 2.518 | 5 5/32 | 2.671 | 5 7/16 | 2.823 | 6 1/8 | ||
| 24 | 1 1/2 - 1 3/4 | 2.463 | 4 27/64 | 2.683 | 4 29/32 | 2.768 | 5 13/32 | 2.921 | 5 11/16 | 3.073 | 6 3/8 | ||
| 28 | 1 3/4 - 2 | 2.713 | 4 43/64 | 2.933 | 5 5/32 | 3.018 | 5 21/32 | 3.171 | 5 15/16 | 3.323 | 6 5/8 | ||
| 32 | 2 - 2 1/4 | 2.963 | 4 59/64 | 3.183 | 5 13/32 | 3.268 | 5 29/32 | 3.421 | 6 3/16 | 3.573 | 6 7/8 | ||
| 36 | 2 1/4 - 2 1/2 | 3.213 | 5 11/64 | 3.433 | 5 21/32 | 3.518 | 6 5/32 | 3.671 | 6 7/16 | 3.823 | 7 1/8 | ||
| 40 | 2 1/2 - 2 3/4 | 3.463 | 5 27/64 | 3.683 | 5 29/32 | 3.768 | 6 13/32 | 3.921 | 6 11/16 | 4.073 | 7 3/8 | ||
| 44 | 2 3/4 - 3 | 3.713 | 5 43/64 | 3.933 | 6 5/32 | 4.018 | 6 21/32 | 4.171 | 6 15/16 | 4.323 | 7 5/8 | ||
| 48 | 3 - 3 1/4 | 3.963 | 5 59/64 | 4.183 | 6 13/32 | 4.268 | 6 29/32 | 4.421 | 7 3/16 | 4.573 | 7 7/8 | ||
| 52 | 3 1/4 - 3 1/2 | 4.213 | 6 11/64 | 4.433 | 6 21/32 | 4.518 | 7 5/32 | 4.671 | 7 7/16 | 4.823 | 8 1/8 | ||
| 56 | 3 1/2 - 3 3/4 | 4.463 | 6 27/64 | 4.683 | 6 29/32 | 4.768 | 7 13/32 | 4.921 | 7 11/16 | 5.073 | 8 3/8 | 5.250 | 8 9/16 |
| 60 | 3 3/4 - 4 | 4.713 | 6 43/64 | 4.933 | 7 5/32 | 5.018 | 7 21/32 | 5.171 | 7 15/16 | 5.323 | 8 5/8 | 5.500 | 8 13/16 |
| 64 | 4 - 4 1/4 | 4.963 | 6 59/64 | 5.183 | 7 13/32 | 5.268 | 7 29/32 | 5.421 | 8 3/16 | 5.573 | 8 7/8 | 5.750 | 9 1/16 |
| 68 | 4 1/4 - 4 1/2 | 5.213 | 7 11/64 | 5.433 | 7 21/32 | 5.518 | 8 5/32 | 5.671 | 8 7/16 | 5.823 | 9 1/8 | 6.000 | 9 5/16 |
| 72 | 4 1/2 - 4 3/4 | 5.463 | 7 27/64 | 5.683 | 7 29/32 | 5.768 | 8 13/32 | 5.921 | 8 11/16 | 6.073 | 9 3/8 | 6.250 | 9 9/16 |
| 76 | 4 3/4 - 5 | 5.713 | 7 43/64 | 5.933 | 8 5/32 | 6.018 | 8 21/32 | 6.323 | 9 5/8 | 6.500 | 9 13/16 | ||
| 80 | 5 - 5 1/4 | 5.963 | 7 59/64 | 6.573 | 9 7/8 | 6.750 | 10 1/16 | ||||||
| 84 | 5 1/4 - 5 1/2 | 6.823 | 10 1/8 | 7.000 | 10 5/16 | ||||||||
| 88 | 5 1/2 - 5 3/4 | 7.073 | 10 3/8 | 7.250 | 10 9/16 | ||||||||
| 92 | 5 3/4 - 6 | 7.323 | 10 5/8 | 7.500 | 10 13/16 | ||||||||
* 1 3/8 -- See RamBolt for specifications.
Inspection Data
A properly installed C50L fastener will posses the dimensional characteristics tabulated below. Should the dimensions ‘A’ or ‘B’ exceed the indicated values, the fastener is being used out-of-grip. A ‘C’ dimension less than the values specified is an indication of incomplete swage. A ‘D’ dimension exceeding the tabulated values is an indication of an incorrect or worn anvil on the installation tool. The ‘A’ dimension can be increased to 1/8 and still meet all published values, provided there is no requirement to meet ASTM specifications pertaining to locking grooves (threads) in the shear plane.
| Dia. | Pin Part No. | Collar type LC* | Collar Type 3LC* | A max | B max | C min | D max | ||
| 1/2 | C50L( )-( )16 | LC-2R16G | 3LC-2R16G | 1/16 | 3/8 | 13/32 | .733 | ||
| 5/8 | C50L( )-( )20 | LC-2R20G | 3LC-2R20G | 1/16 | 3/8 | 5/8 | .916 | ||
| 3/4 | C50L( )-( )24 | LC-2R24G | 3LC-2R24G | 1/16 | 3/8 | 21/32 | 1.110 | ||
| 7/8 | C50L( )-( )28 | LC-2R28G | 3LC-2R28G | 1/16 | 3/8 | 3/4 | 1.282 | ||
| 1 | C50L( )-( )32 | LC-2R32G | 3LC-2R32G | 1/16 | 3/8 | 7/8 | 1.465 | ||
| 1 1/8 | C50LR-BR36 | LC-2R36G | 1/16 | 3/8 | 29/32 | 1.646 | |||
* Manufacturer's Option: 'G' or 'GA', unless specified
Collar Dimensions
| Collar | Diameter | F | G | H | J | K | |||
| LC | 1/2 | .515 - .540 | .800 - .765 | .645 - .610 | |||||
| 5/8 | .650 - .665 | 1.010 - .970 | .875 - .845*3 | ||||||
| 3/4 | .775 - .790 | 1.180 - 1.165 | .960 - .930 | ||||||
| 7/8 | .910 - .935 | 1.375 - 1.345 | 1.113 - 1.083 | ||||||
| 1 | 1.025 - 1.050 | 1.575 - 1.535 | 1.275 - 1.230 | ||||||
| 1 1/8 | 1.150 - 1.180 | 1.770 - 1.740 | 1.425 - 1.385 | ||||||
| 3LC*1 | 1/2 | .515 - .535 | .807 - .793 | .746 - .716 | .156 - .094 | 1.031 - .969 | |||
| 5/8 | .650 - .665 | 1.010 - .970 | .959 -.929 | .187 - .125 | 1.281 - 1.218 | ||||
| 3/4 | .775 - .790 | 1.200 - 1.170 | 1.147 - 1.117 | .218 - .156 | 1.531 - 1.468 | ||||
| 7/8 | .910 - .930 | 1.375 - 1.360 | 1.330 - 1.300 | .250 - .187 | 1.625 - 1.562 | ||||
| 1 | 1.030 - 1.050 | 1.575 - 1.550 | 1.515 - 1.485 | .281 - .218 | 1.906 - 1.843 | ||||
| 1 1/8 | 1.150 - 1.180 | 1.770 - 1.740 | 1.700 - 1.670 | .312 - .250 | 2.156 - 2.093 | ||||
| 8LC*2 | 1/2 | .515 - .535 | .800 - .775 | .500 - .470 | |||||
| 5/8 | .650 - .665 | 1.010 - .970 | .700 - .670 | ||||||
| 3/4 | .775 - .790 | 1.180 - 1.165 | .745 - .715 | ||||||
| 7/8 | .910 - .930 | 1.375 - 1.360 | .863 - .833 | ||||||
| 1 | 1.030 - 1.050 | 1.575 - 1.550 | .980 - .950 | ||||||
Installation Tooling
| Dia. | Installation Tool | Nose Assembly | Type | Use | |||||
| 1/2 | FE5901 | 99-5000 | Hydraulic | Production | |||||
| 5901 | 99-5002 | Hydraulic | Production | ||||||
| 5/8 | 585 | 99-5008 | Hydraulic | Production | |||||
| 586 | 99-5008 | Hydraulic | Production | ||||||
| 3/4 | 585 | 99-5010 | Hydraulic | Production | |||||
| 586 | 99-5010 | Hydraulic | Production | ||||||
| 7/8 | 506 | 99-5014 | Hydraulic | Production | |||||
| 1 | 507 | 99-5016 | Hydraulic | Production | |||||
| 1 1/8 | 507 | 99-5019 | Hydraulic | Production | |||||
| 1 3/8 | 12142 | Integral | Hydraulic | Production | |||||
Hole Data *4
| Dia. | Maximum Hole | ||||||||
| 1/2 | 9/16 | ||||||||
| 5/8 | 11/16 | ||||||||
| 3/4 | 13/16 | ||||||||
| 7/8 | 15/16 | ||||||||
| 1 | 1 1/16 | ||||||||
| 1 1/8 | 1 3/16 | ||||||||
*1 When using 3LC collars, include J dimension in grip dimension to determine grip number.
*2 Optional collar at reduced clamping force and tensile strength. Contact HUCK for data. When using 8LC collars, subtract J dimension from grip dimension to determine grip number.
*3 H length for 20(5/8) diameter in F, I or 2CU material is .805 - .770.
*4 Except C50L60, refer to Mil-Spec MIL-P-23469.