Steam Tempered Is a Finish, Not the Whole Specification
Many taper shank drill buyers ask for steam tempered HSS drills because the premium catalogues they know use a dark industrial finish on general-purpose HSS taper drills. That is a valid visual and functional preference, but it should not be the only line in the RFQ.
A correct quotation separates four fields: the HSS grade, the DIN and Morse taper standard, the point geometry, and the surface finish. If a supplier only sees steam tempered, they can quote many different products under the same color.
What Steam Oxide Contributes
| Field | What it helps | What it does not solve |
|---|---|---|
| Appearance | Dark professional surface for industrial catalogues | Does not prove grade or heat treatment |
| Lubricity story | Surface can retain cutting oil better than bright finish | Does not replace coolant in heavy drilling |
| Corrosion story | Improves storage narrative versus bare bright finish | Still needs oiling and dry packaging |
| Brand position | Matches many European industrial HSS drill expectations | Does not make a low-grade drill premium |
Recommended Steam Tempered Taper Shank Lines
- M2 DIN 345 steam tempered: the volume line for general steel, machine shops, and MRO distribution.
- M35 DIN 345 steam tempered or amber: the premium line for stainless and high-tensile steel buyers.
- DIN 1870 steam tempered: extra length line for deeper reach, quoted after diameter and application review.
- MT3 focus set: useful for distributors serving radial drills and lathe tailstocks in the mid-large diameter range.
Buyer Risks to Control
- Color-only quoting: two suppliers can quote identical dark finish but different HSS grade.
- Wrong point for material: 118 degree may be fine for general steel; stainless and high-strength steel often need 135 degree split point and cobalt grade.
- Poor oxide consistency: patchy finish looks cheap and weakens the private-label shelf story.
- Rust in storage: steam oxide still needs export packaging, oiling, and dry cartons.
RFQ Language That Works
Use direct, testable wording:
Item: HSS Morse taper drill bit
Standard: DIN 345, MT per diameter
Grade: M2 HSS or M35 cobalt
Point: 118 degree thinned point, or 135 degree split point for premium line
Finish: steam tempered / steam oxide dark finish
Marking: buyer brand + diameter + MT + grade
Packaging: individual plastic tube with private-label insert
Build a Steam Tempered Taper Drill Program
Send DIN standard, MT range, M2/M35 grade split, point geometry, finish target, packaging, and sample quantity.
Request Steam Tempered Quote