Recommended Drill Hole Charts

These charts were developed to help installers determine the proper drill hole sizes for all end and intermediate posts. We still recommend that you always call us, 1-800-888-2418, to confirm your proper holes sizes and answer any questions prior to starting your project.

How To Use The Charts:

Examine the drawings below to find your desired fitting combination.
Search the corresponding chart for the assembly combination that has the exact part numbers
you need.
From that line you can read the drill hole sizes for end posts (A & C) and intermediate posts (B).

Important - Please Read:

Only the most commonly used combinations of fittings are shown. If you do not see the exact part numbers for your desired pairing of fittings, please call us to confirm the proper hole sizes.
If CableCrimp™ Hand Crimp fittings are being used, it is assumed that they will be crimped on to the cable after the cable has been laced through all of the intermediate posts. If you prefer to attach the fittings prior to lacing the cables, then please call us to confirm proper drill hole sizes.
Drill hole sizes do not take into consideration the possible use of Rubber Grommets or Protector Sleeves. If you are using either of these items, please call us to confirm proper drill sizes.
If you have an assembly with an In-Line Turnbuckle, please contact us to confirm proper drill sizes.

The Charts

ASSEMBLY #1

End Post A			Intermediate Posts B	End Post C
Fitting	Part #	DrillØ	DrillØ	DrillØ	Part#	Fitting
1/8" Quick-Connect® SS	3146	3/8"	1/4"	5/16"	3191	1/8" Threaded Terminal
3/16"Quick-Connect® SS	3147	9/16"	1/4"	3/8"	3253	3/16" Threaded Terminal
1/4"Quick-Connect® SS	3148	9/16"	5/16"	7/16"	5050	1/4" Threaded Terminal

*If desired, Quick-Connect® SS posts (A) may be through-drilled with a 5/16" diameter bit and then
counter-bored to the depth of the fitting using the corresponding recommended drill hole size noted in the chart above.

ASSEMBLY #2

End Post A			Intermediate Posts B	End Post C
Fitting	Part #	DrillØ	DrillØ	DrillØ	Part#	Fitting
1/8" Threaded Terminal	3191 M	5/16"	5/16"	5/16"	3191 M	1/8" Threaded Terminal
	3193 M	5/16"	5/16"	5/16"	3193 M
	3260 C	5/16"	3/16"	5/16"	3260 C
	3251 C	5/16"	3/16"	5/16"	3251 C

3/16" Threaded Terminal	3253 M	3/8"	3/8"	3/8"	3253 M	3/16" Threaded Terminal
	3256 M	3/8"	3/8"	3/8"	3256 M
	3263 C	3/8"	1/4"	3/8"	3263 C
	3264 C	3/8"	1/4"	3/8"	3264 C

1/4" Threaded Terminal	5050 M	7/16"	7/16"	7/16"	5050 M	1/4" Threaded Terminal

ASSEMBLY #3

End Post A			Intermediate Posts B	End Post C
Fitting	Part #	DrillØ	DrillØ	DrillØ	Part#	Fitting
1/8" Internal Thread Adjuster	3266 M	5/16"	5/16"	5/16"	3266 M	1/8" Internal ThreadAdjuster
3/16" Internal Thread Adjuster	3267 M	3/8"	3/8"	3/8"	3267 M	3/16" Internal Thread Adjuster

ASSEMBLY #4

End Post A			Intermediate Posts B	End Post C
Fitting	Part #	DrillØ	DrillØ	DrillØ	Part#	Fitting
1/8" Fixed Cap End	3315 M	5/16"	5/16"	5/16"	3325 M	1/8" Cap End Turnbuckle
1/8" Fixed Cap End	3318 C	5/16"	3/16"	5/16"	3328 C	1/8" Cap End Turnbuckle

3/16" Fixed Cap End	3316 M	3/8"	3/8"	5/16"	3326 M	3/16" Cap End turnbuckle
3/16" Fixed Cap End	3319 C	3/8"	1/4"	5/16"	3329 C	3/16" Cap End turnbuckle

1/4" Fixed Cap End	3317 M	7/16"	7/16"	3/8"	3327 M	1/4" Cap End Turnbuckle

ASSEMBLY #5

End Post A			Intermediate Posts B	End Post C
Fitting	Part #	DrillØ	DrillØ	DrillØ	Part#	Fitting
1/8" Cap End Turnbuckle	3325 M	5/16"	5/16"	5/16"	3325 M	1/8" Cap End Turnbuckle
1/8" Cap End Turnbuckle	3328 C	5/16"	3/16"	5/16"	3328 C	1/8" Cap End Turnbuckle

3/16" Cap End Turnbuckle	3326 M	5/16"	3/8"	5/16"	3326 M	3/16" Cap End Turnbuckle
3/16" Cap End Turnbuckle	3329 C	5/16"	1/4"	5/16"	3329 C	3/16" Cap End Turnbuckle

1/4" Cap End Turnbuckle	3327 M	3/8"	7/16"	3/8"	3327 M	1/4" Cap End Turnbuckle

ASSEMBLY #6

End Post A			Intermediate Posts B	End Post C
Fitting	Part #	DrillØ	DrillØ	DrillØ	Part#	Fitting
1/8" Fixed Cap End	3315 M	5/16"	5/16"	5/16"	3300 M	1/8" Sleekline Cap End Turnbuckle
1/8" Fixed Cap End	3318 C	5/16"	3/16"	5/16"	3305 C	1/8" Sleekline Cap End Turnbuckle

3/16" Fixed Cap End	3316 M	3/8"	3/8"	5/16"	3302 M	3/16" Sleekline Cap End Turnbuckle
3/16" Fixed Cap End	3319 C	3/8"	1/4"	5/16"	3282 C	3/16" Sleekline Cap End Turnbuckle

ASSEMBLY #7

End Post A			Intermediate Posts B	End Post C
Fitting	Part #	DrillØ	DrillØ	DrillØ	Part#	Fitting
1/8" Sleekline Cap End Turnbuckle	3300 M	5/16"	*9/16" see note	5/16"	3300 M	1/8" Sleekline Cap End Turnbuckle
1/8" Sleekline Cap End Turnbuckle	3305 C	5/16"	3/16"	5/16"	3305 C	1/8" Sleekline Cap End Turnbuckle

3/16" Sleekline Cap End Turnbuckle	3302 M	5/16"	*9/16" see note	5/16"	3302 M	3/16" Sleekline Cap End Turnbuckle
3/16" Sleekline Cap End Turnbuckle	3282 C	5/16"	1/4"	5/16"	3282 C	3/16" Sleekline Cap End Turnbuckle

*Using machine swage M style of fittings on both ends requires a very large drill hole for the intermediate posts. Recommend using either a combination of M & C or type C & C instead.

ASSEMBLY #8

End Post A			Intermediate Posts B	End Post C
Fitting	Part #	DrillØ	DrillØ	DrillØ	Part#	Fitting
1/8" Fixed Ball End	3352 M	5/16"	5/16"	5/16"	3340 M	1/8" Ball End Turnbuckle
1/8" Fixed Ball End	3355 C	5/16"	3/16"	5/16"	3343 C	1/8" Ball End Turnbuckle

3/16" Fixed Ball End	3353M	3/8"	3/8"	5/16"	3341 M	3/16" Ball End Turnbuckle
3/16" Fixed Ball End	3256 C	3/8"	1/4"	5/16"	3344 C	3/16" Ball End Turnbuckle

1/4" Fixed Ball End	3354 M	7/16"	7/16"	3/8"	3342 M	1/4" Ball End Turnbuckle

ASSEMBLY #9

End Post A			Intermediate Posts B	End Post C
Fitting	Part #	DrillØ	DrillØ	DrillØ	Part#	Fitting
1/8" Ball End Turnbuckle	3340 M	5/16"	5/16"	5/16"	3340 M	1/8" Ball End Turnbuckle
1/8" Ball End Turnbuckle	3343 C	5/16"	3/16"	5/16"	3343 C	1/8" Ball End Turnbuckle

3/16" Ball End Turnbuckle	3341M	5/16"	3/8"	5/16"	3341 M	3/16" Ball End Turnbuckle
3/16" Ball End Turnbuckle	3344 C	5/16"	1/4"	5/16"	3344 C	3/16" Ball End Turnbuckle

1/4" Ball End Turnbuckle	3342 M	3/8"	7/16"	3/8"	3342 M	1/4" Ball End Turnbuckle

ASSEMBLY #10

End Post A			Intermediate Posts B	End Post C
Fitting	Part #	DrillØ	DrillØ	DrillØ	Part#	Fitting
1/8" Fixed Ball End	3352 M	5/16"	5/16"	5/16"	3345 M	1/8" Sleekline Ball End Turnbuckle
1/8" Fixed Ball End	3355 C	5/16"	3/16"	5/16"	3350 C	1/8" Sleekline Ball End Turnbuckle

3/16" Fixed Ball End	3353 M	3/8"	3/8"	5/16"	3346 M	3/16" SleeklineBall End Turnbuckle
3/16" Fixed Ball End	3356 C	3/8"	1/4"	5/16"	3351 C	3/16" SleeklineBall End Turnbuckle

ASSEMBLY #11

End Post A			Intermediate Posts B	End Post C
Fitting	Part #	DrillØ	DrillØ	DrillØ	Part#	Fitting
1/8" Sleekline Ball End Turnbuckle	3345 M	5/16"	*9/16" see note	5/16"	3345 M	1/8" Sleekline Ball End Turnbuckle
1/8" Sleekline Ball End Turnbuckle	3350 C	5/16"	3/16"	5/16"	3350 C	1/8" Sleekline Ball End Turnbuckle

3/16" Sleekline Ball End Turnbuckle	3346 M	5/16"	*9/16" see note	5/16"	3346 M	3/16" Sleekline Ball End Turnbuckle
3/16" Sleekline Ball End Turnbuckle	3351 C	5/16"	1/4"	5/16"	3351 C	3/16" Sleekline Ball End Turnbuckle

*Using machine swage M style of fittings on both ends requires a very large drill hole for the intermediate posts. Recommend using either a combination of M & C or type C & C instead.

ASSEMBLY #12

End Post A			Intermediate Posts B	End Post C
Fitting	Part #	*PinØ	DrillØ	*PinØ	Part#	Fitting
1/8" Fixed Jaw End	3288 M	5/16"	5/16"	5/16"	3270 M	1/8" Jaw Turnbuckle
1/8" Fixed Jaw End	3279 C	5/16"	3/16"	5/16"	3268 C	1/8" Jaw Turnbuckle

3/16" Fixed Jaw End	3331 M	5/16"	3/8"	5/16"	3271 M	3/16" Jaw Turnbuckle
3/16" Fixed Jaw End	3280 C	5/16"	1/4"	5/16"	3269 C	3/16" Jaw Turnbuckle

1/4" Fixed Jaw End	3336 M	3/8"	7/16"	3/8"	3332 M	1/4" Jaw Turnbuckle

*Before drilling pin hole through bar or tab, make sure there is adequate clearance, especially if jaw end terminates at an angle.

ASSEMBLY #13

End Post A			Intermediate Posts B	End Post C
Fitting	Part #	*PinØ	DrillØ	*PinØ	Part#	Fitting
1/8" Jaw Turnbuckle	3270 M	5/16"	5/16"	5/16"	3270 M	1/8" Jaw Turnbuckle
1/8" Jaw Turnbuckle	3268 C	5/16"	3/16"	5/16"	3268 C	1/8" Jaw Turnbuckle

3/16" Jaw Turnbuckle	3271 M	5/16"	3/8"	5/16"	3271 M	3/16" Jaw Turnbuckle
3/16" Jaw Turnbuckle	3269 C	5/16"	1/4"	5/16"	3269 C	3/16" Jaw Turnbuckle

1/4" Jaw Turnbuckle	3332 M	3/8"	7/16"	3/8"	3332 M	1/4" Jaw Turnbuckle

*Before drilling pin hole through bar or tab, make sure there is adequate clearance, especially if jaw end terminates at an angle.

ASSEMBLY #14

End Post A			Intermediate Posts B	End Post C
Fitting	Part #	*PinØ	DrillØ	*PinØ	Part#	Fitting
1/8" Fixed Jaw End	3288 M	5/16"	**9/16" see note	5/16"	3295 M	1/8" Sleekline Jaw Turnbuckle
1/8" Fixed Jaw End	3279 C	5/16"	3/16"	5/16"	3297 C	1/8" Sleekline Jaw Turnbuckle

3/16" Fixed Jaw End	3331 M	5/16"	**9/16" see note	5/16"	3296 M	3/16" Sleekline Jaw Turnbuckle
3/16" Fixed Jaw End	3280 C	5/16"	1/4"	5/16"	3299 C	3/16" Sleekline Jaw Turnbuckle

*Before drilling pin hole through bar or tab, make sure there is adequate clearance, especially if jaw end terminates at an angle.
**Using machine swage M style of fittings on both ends requires a very large drill for the intermediate posts. Recommend using either a combination of M & C or type C & C instead.

ASSEMBLY #15

End Post A			Intermediate Posts B	End Post C
Fitting	Part #	*PinØ	DrillØ	*PinØ	Part#	Fitting
1/8" Sleekline Jaw Turnbuckle	3295 M	5/16"	**9/16" see note	5/16"	3295 M	1/8" Sleekline Jaw Turnbuckle
1/8" Sleekline Jaw Turnbuckle	3297 C	5/16"	3/16"	5/16"	3297 C	1/8" Sleekline Jaw Turnbuckle

3/16" Sleekline Jaw Turnbuckle	3296 M	5/16"	**9/16" see note	5/16"	3296 M	3/16" Sleekline Jaw Turnbuckle
3/16" Sleekline Jaw Turnbuckle	3299 C	5/16"	1/4"	5/16"	3299 C	3/16" Sleekline Jaw Turnbuckle

ASSEMBLY #16

End Post A		Intermediate Posts B	End Post C
Fitting	Part #	DrillØ	Part#	Fitting
1/8" Fixed Surface Mount	3281 M	5/16"	3278 M	1/8" Surface Mount Turnbuckle
1/8" Fixed Surface Mount	3333 C	3/16"	3275 C	1/8" Surface Mount Turnbuckle

3/16" Fixed Surface Mount	3284 M	3/8"	3277 M	3/16" Surface Mount Turnbuckle
3/16" Fixed Surface Mount	3334 C	1/4"	3276 C	3/16" Surface Mount Turnbuckle

1/4" Fixed Surface Mount	3337 M	7/16"	3338 M	1/4" Surface Mount Turnbuckle

*Surface mounted fittings are normally mounted with lag screws (#3183) or bolts (#3322) sold separately. Metal posts may be tapped to accommodate the bolt threads.

ASSEMBLY #17

End Post A		Intermediate Posts B	End Post C
Fitting	Part #	DrillØ	Part#	Fitting
1/8" Surface Mount Turnbuckle	3278 M	5/16"	3278 M	1/8" Surface Mount Turnbuckle
1/8" Surface Mount Turnbuckle	3275 C	3/16"	3275 C	1/8" Surface Mount Turnbuckle

3/16" Surface Mount Turnbuckle	3277 M	3/8"	3277 M	3/16" Surface Mount Turnbuckle
3/16" Surface Mount Turnbuckle	3276 C	1/4"	3276 C	3/16" Surface Mount Turnbuckle

1/4" Surface Mount Turnbuckle	3338 M	7/16"	3338 M	1/4" Surface Mount Turnbuckle

*Surface mounted turnbuckles are normally mounted with lag screws (#3183) or bolts (#3322) sold separately. Metal posts may be tapped to accommodate the bolt threads.

ASSEMBLY #18

End Post A		Intermediate Posts B	End Post C
Fitting	Part #	DrillØ	Part#	Fitting
1/8" Fixed Surface Mount	3281 M	**9/16" see note	3309 M	1/8" Sleekline Surface Mount Turnbuckle
1/8" Fixed Surface Mount	3333 C	3/16"	3311 C	1/8" Sleekline Surface Mount Turnbuckle

3/16" Fixed Surface Mount	3284 M	**9/16" see note	3310 M	3/16" Sleekline Surface Mount Turnbuckle
3/16" Fixed Surface Mount	3334 C	1/4"	3312 C	3/16" Sleekline Surface Mount Turnbuckle

*Surface mounted turnbuckles are normally mounted with lag screws (#3183) or bolts (#3322) sold separately. Metal posts may be tapped to accommodate the bolt threads.
*Using machine swage M style of fittings on both ends requires a very large drill for the intermediate posts. Recommend using either a combination of M & C or type C & C instead.

ASSEMBLY #19

End Post A		Intermediate Posts B	End Post C
Fitting	Part #	DrillØ	Part#	Fitting
1/8" Sleekline Surface Mount Turnbuckle	3309 M	**9/16" see note	3309 M	1/8" Sleekline Surface Mount Turnbuckle
1/8" Sleekline Surface Mount Turnbuckle	3311 C	3/16"	3311 C	1/8" Sleekline Surface Mount Turnbuckle

3/16" Sleekline Surface Mount Turnbuckle	3310 M	**9/16" see note	3310 M	3/16" Sleekline Surface Mount Turnbuckle
3/16" Sleekline Surface Mount Turnbuckle	3312 C	1/4"	3312 C	3/16" Sleekline Surface Mount Turnbuckle