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Metric M6 bolt handle thread adapter

  • Brand: BoltKnobs.Com
  • Product Code: M6-ADAPTER
  • Availability: In Stock
  • $10.00

Metric M6 bolt handle thread adapter

Converts bolt handles in the metric M6 x 1mm thread to accept 5/16 x 24 UNF bolt knobs

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 our carbon fiber and alloy models. 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 to it, allowing easier removal in the future. If a thread locking compound is used, we don't recommend bonding the adapter to the handle, rather do so to the knob.

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

  • Accuracy International AE, AW, and AX
  • Bergara B-14
  • Blaser R8
  • Blaser R93
  • Browning Maral
  • Chapuis Rols
  • 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 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 drill and re-tap the knob for it to fit flush once installed as modifying the adapter won't have any bearing on this. Our molded carbon fiber knobs have approximately 0.51" to 0.55" (13mm to 14mm) of internal threaded length which requires shortening the adapter a little, our 7075-T76 alloy knob requires no modification for this adapter to fit. Knobs from other manufacturers will vary.


Construction: CNC turned from bar stock
Material: 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)

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Tags: Blaser R93 bolt knob, Blaser R8 bolt knob, Bergara B-14 bolt knob, Lithgow LA101 bolt knob, Lithgow LA102 bolt knob, Accuracy International bolt knob, AIAE bolt knob, AIAW bolt knob, AIAX bolt knob, CZ 455 bolt knob, CZ 457 bolt knob, CZ 550 bolt knob, Sauer 100 bolt knob, Sauer 101 bolt knob, Sauer 200 STR bolt knob, Mauser M18 bolt knob

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