Ground piston rod 42CrMo4 — Ra 0.2 µm · 50–55 HRC · h6
Precision shafts & pins

Induction hardened ground piston rod 42CrMo4

Ø20–Ø120 mm, straightness 0.01 mm/300 mm, Ra 0.2 µm, hard chrome option

Part no.: NV-SHF-4020

Request a quote
MOQ
50 pcs
Lead time
15–20 working days
Certifications and compliance
ISO 9001:2015 quality system EN 10204 3.1 material certificate Hardness and case depth report per batch Chrome plating thickness report

Technical specification

Material 42CrMo4 (AISI 4140) quenched and tempered
Diameter range Ø 20 – Ø 120 mm
Diameter tolerance h6 / h7 / f7 to order
Straightness ≤ 0.01 mm per 300 mm
Roundness ≤ 0.002 mm
Surface finish Ra 0.2 µm (superfinished)
Hardness Induction hardened 50–55 HRC, case depth 1.5–3.0 mm
Chrome plating Hard chrome 20–30 µm, optional
Length Cut to length up to 6,000 mm

Details

Hydraulic piston rods ground and superfinished from induction-hardened 42CrMo4, supplied cut to length with chamfered or threaded ends. Surface finish Ra 0.2 µm and straightness within 0.01 mm per 300 mm keep seal life predictable in high-cycle applications.

Hardening and finishing

Induction hardening to 50–55 HRC at a controlled case depth, followed by rough and finish cylindrical grinding and a superfinishing pass. Hard chrome plating at 20–30 µm is available where corrosion resistance is needed.

Verification

Roundness and cylindricity are measured on a form tester; hardness is checked per batch with a calibrated tester; each rod is checked for straightness on a granite bed before packing.

Applications

  • Hydraulic cylinders
  • Pneumatic actuators
  • Machine tool linear axes
  • Press and injection moulding machines
  • Marine steering gear

Frequently asked questions

What case depth do you hold for induction hardening?

1.5–3.0 mm depending on diameter, verified on a sample from each batch with a hardness traverse and reported with the shipment.

Is hard chrome plating necessary?

Not for indoor hydraulic applications with clean oil. It is worth specifying in humid, wash-down or marine environments, where it roughly doubles the corrosion life of the rod surface.

Can you supply rods with the thread already cut?

Yes. Send the thread specification and the undercut detail; threads are rolled after grinding where the geometry allows, which is stronger than a cut thread.

Request a quote

Send drawings, a part number or a description of the component you need. We reply with a quotation, lead time and tooling assessment — usually within one business day.

Request a quote

Send drawings, a part number or a description of the component you need. We reply with a quotation, lead time and tooling assessment — usually within one business day.

Parts in this inquiry (1)

  • Induction hardened ground piston rod 42CrMo41 ×

Your details are used only to answer this inquiry. We do not share them with third parties and we do not add you to a mailing list.

Related products

CNC machined mounting bracket — AISI 304 / 1.4301 · ±0.01 mm bores

CNC machined stainless mounting bracket

AISI 304 bracket, ±0.01 mm bores, 5,000 pcs/day capacity, first article report included

MOQ
100 pcs
Lead time
15–18 working days for repeat orders; 25 working days with first-article approval

Part no. NV-CNC-1042 · From USD 6.40/pc FOB Ningbo at 1,000 pcs

Ball valve DN50 PN40 — CF8M / 316L · full port · ISO 5211

Two-piece stainless steel ball valve DN50 PN40

316L body, full port, ISO 5211 pad, hydro-tested at 1.5× with certificate per batch

MOQ
20 pcs
Lead time
10–12 working days from stock material; 20 working days for actuator-ready variants

Part no. NV-VLV-2050 · From USD 38.50/pc FOB Ningbo at 100 pcs