Collet 250

Product Description
The Hardinge Sure-Grip® Expanding Collet System is engineered for internal gripping of larger-diameter bores on lathes and arbors. The #250 Series covers 3/4" to 1" (19.05 to 25.4 mm). Collets are offered in 1/64" increments and each collet will securely hold a workpiece bore up to -0.001" (0.0254 mm) under the nominal collet size.

Advantages

• Instant centering of the arbor—no adjustment after mounting
• Quick changeover for reduced setup time
• Wide gripping range per collet (fewer collets required)
• True parallel gripping even when contacting half the collet body
• High gripping force for stable machining
• Light gripping available for small bores down to 1/8" (3.175 mm)
• Built-in safety stop to prevent overexpansion
• Exact part length control for repeatable results
• Interchangeable collets for consistent capacity across spindle styles

Technical specifications

• Type: Sure-Grip® expanding collet
• Brand: Hardinge
• Series/Style: #250
• Working range: 3/4" to 1" (19.05 to 25.4 mm)
• Available hole sizes: fractional, decimal inch and metric (collets in 1/64" increments)
• Holding tolerance: will hold a bore up to -0.001" (0.0254 mm) under collet size
• Application: internal gripping of larger diameter bores

Applications & ordering

• Suitable for lathe arbors, faceplates and dedicated expanding-collet fixtures
• Order by series (#250) and required bore size; specify fractional, decimal or metric option
• Collets are interchangeable across compatible spindle styles for consistent setup
• Includes safety stop feature; check machine and arbor compatibility before ordering