Steel Products

Turned Ground & Polished

OUR PRODUCT

Through years of experience producing Turned, Ground and Polished shafting, precisely to customer specifications, Northlake Steel is 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).

Turned, Ground, and Polished (TGP) steel bars play a crucial role in various industries due to their specific characteristics and benefits.  This manufacturing process involves precision grinding to achieve tight tolerances, smooth surface finishes, and improved straightness.

The primary grades we stock for TGP are 1045, 10V45, and 4140HT, but we can produce TGP in almost any grade of steel.  These grades can include, but are not limited to: 1018, 10V45, 1050, 1060, 1070, 1144, 6150, and 52100.  As well as stainless grade such as 303, 304, 316, 416 and 17-4.

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.

TG&P STOCK ITEMS

STANDARD & METRIC SIZES

NominalTolerance10454140HT10V45
1/2”.4985/.4995xx
5/8”.6235/.6245xx
3/4”.7485/.7495xx
7/8”.8735/.8745x
1”.9985/.9995xxx
1-1/8”1.1235/1.1245x
1-3/16”1.1860/1.1870xx
1-1/4”1.2485/1.2495xxx
1-3/8”1.3735/1.3745x
1-7/16”1.4360/1.4370xx
1-1/2”1.4985/1.4995xxx
1-11/16”1.6855/1.6870x
1-3/4”1.7480/1.7495xxx
1-7/8”1.8730/1.8745x
1-15/16”1.9355/1.9370xx
2”1.9980/1.9995xxx
2-3/16”2.1855/2.1870x
2-1/4”2.2480/2.2495xx
2-7/16”2.4355/2.4370xx
2-1/2”2.4980/2.4995xxx
2-11/16”2.6855/2.6870x
2-3/4”2.7480/2.7495x
2-15/16”2.9350/2.9370xx
3”2.9975/2.9995xxx
3-7/16”3.4340/3.4370xx
3-1/2”3.4965/3.4995xxx
3-3/4”3.7465/3.7495x
3-15/16”3.9340/3.9370xx
4”3.9965/3.9995xxx
4-7/16”4.4340/4.4370xx
4-1/2”4.4965/4.4995xx
5”4.9970/5.0000xxx
6”5.9970/6.0000xxx
7”6.9970/7.0000xxx
20MM.7859/.7869x
25MM.9827/.9837xx
30MM1.1796/1.1806xx
40MM1.5733/1.5743x
50MM1.9665/1.9680xx
60MM2.3602/2.3617x
80MM3.1471/3.1491x
100MM3.9340/3.9370xx

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

DIAMETERASTM TOLERANCESNORTHLAKE TOLERANCES
To 1-1/2” incl+0 / – .001”+0 / – .001”
Over 1-1/2” to 2-7/16”+0 / – .0015”+0 / – .0015”
2-1/2” to 2-15/16”+0 / – .002”+0 / – .0015”
3” to 80mm incl+0 / – .003”+0 / – .002”
3-7/16” to 4 incl+0 / – .003”+0 / – .003”
Over 4” to 6” incl+0 / – .004”+0 / – .003”
Over 6”+0 / – .005”+0 / – .003”

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