Turned, Ground and Polished

Many years of experience producing Turned, Ground and Polished shafting, precisely to customer specifications, has enabled Northlake Steel to become a proven industry leader.

Our TG&P bars meet or exceed the standards set forth by ASTM A108 (ASTM A108-18, Standard Specification for Steel Bar, Carbon and Alloy, Cold-Finished, ASTM International, West Conshohocken, PA, 2018).

Sizes

With diameters ranging from 0.158” (4mm) round through 16” round and lengths up through 75′, we are virtually unchallenged in size and precision TG&P capabilities.

We can apply all processes to OD tubing with the same diameter and length capabilities.

We stock many TG&P sizes in Carbon (1045) and Alloy (4140 HT).   Stock items are produced to bearing tolerances or .0005” under nominal sizes.  Typical stock lengths are 24’ but we also carry 12’ lengths in the most popular sizes.

Northlake will produce any standard, metric, or special size shafting.  We are confident that we can fulfill all of your company’s Turned, Ground and Polished needs.

Contact us online or call 888-278-4682.

Click here to learn even more about TG&P and other cold finished bars.

TG&P Stock Items

STANDARD & METRIC SIZES

Nominal Tolerance 1045 4140HT
1/2” .4985/.4995 x
5/8” .6235/.6245 x
3/4” .7485/.7495 x
7/8” .8735/.8745 x
1” .9985/.9995 x x
1-1/8” 1.1235/1.1245 x
1-3/16” 1.1860/1.1870 x x
1-1/4” 1.2485/1.2495 x x
1-3/8” 1.3735/1.3745 x
1-7/16” 1.4360/1.4370 x x
1-1/2” 1.4985/1.4995 x x
1-11/16” 1.6855/1.6870 x
1-3/4” 1.7480/1.7495 x x
1-7/8” 1.8730/1.8745 x
1-15/16” 1.9355/1.9370 x x
2” 1.9980/1.9995 x x
2-3/16” 2.1855/2.1870 x
2-1/4” 2.2480/2.2495 x
2-7/16” 2.4355/2.4370 x x
2-1/2” 2.4980/2.4995 x x
2-11/16” 2.6855/2.6870 x
2-3/4” 2.7480/2.7495 x
2-15/16” 2.9350/2.9370 x x
3” 2.9975/2.9995 x x
3-7/16” 3.4340/3.4370 x x
3-1/2” 3.4965/3.4995 x x
3-3/4” 3.7465/3.7495 x
3-15/16” 3.9340/3.9370 x x
4” 3.9965/3.9995 x x
4-7/16” 4.4340/4.4370 x x
4-1/2” 4.4965/4.4995 x x
5” 4.9970/5.0000 x
6” 5.9970/6.0000 x
7” 6.9970/7.0000 x
20MM .7859/.7869 x
25MM .9827/.9837 x x
30MM 1.1796/1.1806 x x
40MM 1.5733/1.5743 x
50MM 1.9665/1.9680 x x
60MM 2.3602/2.3617 x
80MM 3.1471/3.1491 x
100MM 3.9340/3.9370 x x

Quality: Start to Finish

We believe that our real asset is not just our range of sizes, but the quality we put into all of our products.

Northlake size tolerances (listed below) are closer than standard TG&P tolerances.  Upon request, we can hold even closer tolerances for special applications.

The standard Ra finish for TGP is 20 or better but we can hold 5-10 Ra, as needed.
The straightness tolerance on Northlake material is .001″ to .002″ per foot, not more than .010” T.I.R on 24’ products.

SIZE TOLERANCES FOR TURNED, GROUND AND POLISHED (TG&P) ROUNDS CARBON, ALLOY & STAINLESS BAR

Diameter ASTM Tolerances Northlake Tolerances
to 1-1/2 + .0000 / – .0010 + .0000 / – .0010
> 1-1/2 to < 2 + .0000 / – .0015 + .0000 / – .0010
2 to < 2-1/2 + .0000 / – .0015 + .0000 / – .0015
2-1/2 to 3 + .0000 / – .0020 + .0000 / – .0015
> 3 to 4 + .0000 / – .0030 + .0000 / – .0020
> 4 to 6 + .0000 / – .0040 + .0000 / – .0030
> 6 to 10 + .0000 / – .0050 + .0000 / – .0030
> 10 to 16 + .0000 / – .0050 + .0000 / – .0040
Northlake Steel