Technical Precision Center
With over a century of experience combined with today’s technological advances in computer-aided design, the engineers at Rathbone Precision Metals are able to meet the most exacting customer requirements from a multitude of materials, including Carbon Steel, Free Cutting, Alloy Steels, 300 Series Stainless, 400 Series Stainless, High Temperature, Copper, Brass, and Bronze, and Nickel-Copper.
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Profile Dimensional Tolerances
| Characteristic |
Standard Rolling Tolerances |
Standard Drawing Tolerances |
Optional |
| Linear |
± 0.002” Thickness
± 0.005” Width |
± 0.002” All |
± 0.0005” |
| Radial |
± 0.010” radii
Shape dependent ±
|
± 0.005” Small
± 0.010” Large radii |
± 0.002” |
| Corners/Fillets |
Dependent on location on profile |
0.015” max – 90°
Blend on Obtuse |
0.005” max – 90°
Obtuse – Review |
| Surface Finish |
63 Ra |
125 Ra |
40 Ra max |
| Size Limitations |
Typically less than 1.5” |
Typical Size Range 0.032” – 2.0” |
Configuration Dependent |
Additional Conditions
| Characteristic |
Standard Tolerances |
Optional |
Straightness
Twist |
0.020” / Foot cumulative
0.030” / Foot cumulative – small wire
± 2° per foot |
0.005” / Foot |
| Temper |
As Drawn or As Rolled |
Stress relieved
Annealed
Heat treated (outsourced) |
| Decarburization |
Not checked unless there is a customer requirement |
0.005” max total and or partial –
Requires surface improved raw stock |
| Lengths |
10’-12’ from coil material
8’-14’ from bar raw material with variation in length to be within ± 1.0” |
Dead lengths
Abrasive / cold saw pieces
± 0.005” on cut pieces |
| Mechanical Properties |
Rockwell Hardness reported if required by customer |
Outside testing available |
| Surface Coatings |
Carbon & Alloy – phosphate & soap
Stainless – cleaned dull matte finish
Copper & Brass – residual soap |
Bright & shiny appearance |
| Cut Ends |
Deformed pinch cut / Shear cut |
Shaped shear, saw cut ends |
| Shipping Containers |
Reddi Crate |
Wooden boxes, spools, banded bundles |
| Hardness Range Values |
Carbon HRB 75 – HRB 95
Alloy HRB 90 – HRC 28
Stainless HRB 90 – HRC 25
Copper & Brass HRB 60 – HRB 85 |
May be adjusted by modification of cold work reductions |
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