Metric M6 Bolt Handle Thread Adapter

This Metric M6 Bolt Handle Thread Adapter by Lumley converts bolt handles in the metric M6 x 1mm thread to accept 5/16" x 24 UNF bolt knobs. Sold in a package of 3 adapters.

This thread adapter has an internal metric M6 thread and an external 5/16 x 24 UNF thread which fits nearly every aftermarket bolt knob including the Lumley Carbon Fiber and Alloy bolt knobs. Common with European and rimfire rifles, aftermarket knob options in M6 are limited. CNC machined from brass, this adapter won't corrode and is softer than the bolt handle steel or knob that you will fit it to, allowing easier removal in the future. If a thread-locking compound is used, Lumley doesn't recommend bonding the adapter to the handle, rather do so to the knob.

Features: 

• CNC turned from bar stock
• Brass for easy future removal
• Inside thread: M6 x 1mm (0.47" / 12mm long)
• Outside thread: 5/16" x 24 UNF (0.59" / 15mm long)
• Sold in a 3-pack of adapters

The following rifles have the M6 x 1mm thread on their bolt handles:

• Accuracy International AE, AT, ATX, AW, AXMC, and AXSR
• Bergara BRX1, BMR and B-14
• Blaser R8 and R93
• Browning Maral
• Chapuis Rols
• CZ 455, 457, 550, and 557
• Desert Tech SRS (all variants)
• Lithgow LA101
• Lithgow LA102
• Mauser M12
• Mauser M18
• Merkel Helix
• Sauer 100
• Sauer 101
• Sauer 200 STR
• Sig Sauer SSG 3000

Fitting Guide:

Check first that there is sufficient threaded length of the bolt handle as well as the bolt knob that you intend to fit using this adapter which is 0.6" (15mm) long. If the knob's internal thread is shorter than the 0.6" (15mm), you will need to shorten the adapter. cut or file down and then clean up the threads. If the threaded end of your bolt handle is longer than the threaded internal length of the knob then the only option is to drill and re-tap the knob for it to fit flush once installed as modifying the adapter won't have any bearing on this. The Lumley Carbon Fiber knobs have approx 0.51" to 0.55" (13mm to 14mm) of internal threaded length which requires shortening of the adapter a little. The Lumley Alloy knob requires no modification for this adapter to fit. Knobs from other manufacturers will vary.