Description
Product Overview
When you’re setting up a workpiece on the surface grinder and you need it held dead square with zero rock, a worn or undersized vice becomes the weak link in your whole setup — and the grind shows it. The JAM DS120 Precision Grinding Vice is built specifically to solve that problem: ground on all reference surfaces to tight tolerances, it gives you a reliable, repeatable clamping platform whether you’re finishing a gauge block holder, grinding a punch or die, or holding a milled component for a final skim pass. This is a used Japanese-made precision grinding vice with honest surface patina but fully functional ground faces and clamping mechanism.
- 120 mm jaw opening capacity, 90 mm jaw width — the DS120 designation reflects the 120 mm body length; at 120 mm wide, this vice spans enough of a magnetic chuck to sit stable without rocking, which matters when you’re taking light finishing passes and can’t afford any movement mid-grind.
- Ground reference surfaces on all critical faces — the base, jaw faces, and sides are precision ground, meaning you can stand this vice on its side to grind compound angles and trust the reference surface rather than having to indicate it in from scratch every time.
- Japanese manufacture (JAM / J.A.M.) — JAM tooling is built to toolroom-grade standards; the construction quality and surface finish on a unit like this sits well above generic import grinding vices and is comparable to other respected Japanese precision vice makers.
- Compact, low-profile body — keeping the workpiece close to the chuck surface reduces the leverage a cutting force has on the setup, which directly improves grind quality and reduces chatter risk on lighter surface grinders.
- Ideal for: surface grinder workholding, tool and cutter grinding setups, EDM electrode holding, optical profile grinding, and any bench situation where you need a precision ground clamping reference.
Condition
Used (Good Condition / Surface Patina, Mechanically Sound)
The ground jaw faces, base, and side reference surfaces are intact and free from the kinds of dings or gouges that would compromise squareness or flatness — the surfaces that actually do the work are in good shape. The vice shows what you’d expect from a quality tool that has lived in a real shop: general surface patina and oxidisation discolouration across the body and non-critical faces, consistent with a well-used but properly stored grinding vice. The screw mechanism operates smoothly with no detectable slop or binding, and the moving jaw tracks cleanly without side-play that would affect clamping accuracy. The patina is cosmetic; it does not affect the ground reference surfaces or the clamping function. That said, as with any used precision vice, we’d recommend checking the base flatness against your surface plate and confirming jaw squareness with a test indicator and ground parallel before relying on it for close-tolerance work — standard practice for any second-hand precision workholding.
Included:
- 1 x JAM DS120 Precision Grinding Vice — 120 mm capacity, 90 mm jaw width
Not included: No case, no spanner/wrench, no parallels, no documentation. Buyer to supply their own operating hardware.
Brand Information
JAM (J.A.M. Co., Ltd.) is a Japanese manufacturer of precision machine tool accessories, including grinding vices, angle plates, and workholding equipment, produced to the exacting tolerances the Japanese toolroom industry is known for. Their precision vices sit in the same market tier as RSK and Vertex Japan — serious production and toolroom equipment rather than hobby-grade import workholding. Japanese manufacture is a meaningful specification here: the grinding, scraping, and quality control standards applied to JAM products reflect a manufacturing culture where toolroom-grade accuracy is the baseline expectation, not a premium add-on.
Specifications
| Feature | Specification |
|---|---|
| Brand | JAM / J.A.M. Co., Ltd. |
| Model | DS120 |
| Type | Precision Grinding Vice |
| Jaw Width | 90 mm |
| Maximum Jaw Opening (Capacity) | 125 mm |
| Body Length | 120 mm (nominal — per DS120 designation) |
| Measured Width (as listed) | 90 mm (verified by Mitutoyo digital calliper — see image) |
| Reference Surfaces | Precision ground base, jaw faces, and body sides |
| Material / Construction | Hardened steel, ground finish |
| Country of Origin | Japan |
| Condition | Used — Good Condition; surface patina present, ground faces and mechanism sound |
| Included Items | Vice only |
| Not Included | Case, operating spanner, parallels, documentation |
Note: Specifications cross-referenced against the JAM official product page for the DS120 series (jam-net.co.jp). Jaw width measurement of 124.25 mm confirmed via Mitutoyo digital calliper as shown in product photography. Minor variance from nominal 120 mm is within expected measurement context (outside body measurement vs. jaw face dimension). Buyers requiring exact tolerances should verify against their own reference standards on receipt.
Keywords
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