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Hex Adjusters, M4 x 0.25 Fine


  • Hex Adjusters and Adjusters with Knobs
  • Exceed Class 3 Tolerances
  • 250 µm Travel per Revolution

LN4M29

N250L4P

F4MSSN1P

F4MSSK1L

F4MSS25

F4MSS12

M4AS15

F4MSSK1

2.0 mm (5/64")
Hex Socket

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Features

  • Hex Adjusters Feature a 2.0 mm (5/64") Hex Socket 
  • Removable Adjustment Knobs Available for Hex Adjusters
  • Adjuster Screws with Integrated Adjustment Knob
  • Threaded Bushings, Nuts, and Lock Nuts for Threading Integration

These M4 x 0.25 adjuster screws, which are made from DFARS-compliant materials, are ideal for limited space applications that require fine (250 μm/rev) resolution. Each threaded component is individually tested with a master gauge set that ensures the interchangeability of our fine adjustment components. The adjuster body is constructed of 303 stainless steel and the ball tip is constructed using 440 stainless steel that is fixed onto the adjuster using epoxy. The hex adjusters feature a 2.0 mm (5/64") hex socket, which provides a simple way to make fine adjustments. The fine adjuster screws come lubricated to ensure smooth mating into compatible components.

For applications where the material certifications are needed, please contact Tech Support prior to purchase.

Threaded Bushing Application

Integrating Fine Adjustment Screws Into Optomechanical Systems

The assembly process begins by producing the appropriately sized mating hole for the threaded bushing. Given the close fit between the threaded bushing and the mating adjuster screw, we caution against using a press fit to assemble these products. For our own production needs, we use a permanent anaerobic adhesive that provides excellent long-term performance.

We recommend using Loctite Anaerobic Adhesive product number 680 or equivalent. In order to ensure maximum strength between the bonded parts, we strongly urge the user to follow carefully the instructions provided by Loctite, which specify the amount of clearance between the threaded bushing and the mounting plate. The most common source of failure is not allowing for the proper clearance between the parts being bonded since this clearance provides for the proper volume of adhesive.

When assembling, apply a small amount of the Loctite adhesive to the threaded bushing only. Rotate the bushing as it is installed to ensure a uniform distribution of the adhesive. After insertion, remove any excess adhesive from around the part.

As shown in the figure to the right, the flange on the mating bushing is designed to support the axial load of the screw and bushing assembly.

Volume Pricing Discount
Contact Thorlabs

OEM & Custom Precision Screws

Thorlabs manufactures custom and high volume OEM precision screws and bushings with various diameters, lengths, and threads. To inquire about custom or OEM precision screws, please contact Technical Support or use the "Contact Us" form to the right. A specialist will contact you within 24 hours or the next business day.

Precision Screw Capabilities

Thorlabs' in-house machine shop, located in Newton, NJ, gives us the ability to quickly produce large quantities of precision screws and bushings. We are equipped to manufacture screw diameters ranging from 2.5 mm to 20 mm with lengths up to 165 mm and a maximum thread pitch of 200 TPI. Our standard adjuster screw design has a hardened steel ball tip to provide a single point of contact; for other applications we are able to provide adjusters without the steel ball. Custom orders can be achieved on a case-by-case basis. For large orders of an item, Thorlabs passes on to the customer the cost savings associated with planned production of high volumes of that item. For more information on Thorlabs' discount pricing policy, click the "V" link to the right. We also offer a large variety of stock precision screws, which are available here.

Fast Turn-Around Times
Our experienced, highly skilled machinists are running our on-site Citizen Swiss Screw Machines 24 hours a day, allowing us to produce high-volume custom and OEM orders. Each machine is capable of running unattended, producing one screw every 30 to 120 seconds. This flexibility allows us to fulfill multiple orders at once without sacrificing quality.

High Quality
Thorlabs inspects all of our fabricated precision screws and bushings after the initial fabrication process and right before packaging. All inspections adhere to the ANSI AQL1.5 acceptable quality level, which states that if a certain percentage, based upon the amount of product in a certain lot, does not meet specification, then the entire lot is not sold. This ensures that all customers receive the highest quality product every time and that all items will be of equal performance.

Precision Screw Production


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M4 x 0.25 Fine Hex Adjusters



  • Six Lengths Available from 8 mm to 25 mm
  • 2.0 mm (5/64") Hex Key Available
  • Max Load: 8.5 kg (18.74 lbs)
Our high precision M4 x 0.25 Fine Hex Adjusters can be adjusted with a 2.0 mm (5/64") hex key or with our F4MSSK1 or F4MSSK1L removable adjustment knobs, available below.  

These adjusters are designed to be used with our M4 x 0.25 threaded bushings, available below. 

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Metric Price Available
F4MSS8 Support Documentation
F4MSS8NEW!Fine Hex Adjuster, M4 x 0.25, 8 mm Long
$6.50
Today
F4MSS10 Support Documentation
F4MSS10NEW!Fine Hex Adjuster, M4 x 0.25, 10 mm Long
$7.00
Today
F4MSS12 Support Documentation
F4MSS12NEW!Fine Hex Adjuster, M4 x 0.25, 12 mm Long
$7.50
Today
F4MSS15 Support Documentation
F4MSS15NEW!Fine Hex Adjuster, M4 x 0.25, 15 mm Long
$7.50
Today
F4MSS20 Support Documentation
F4MSS20NEW!Fine Hex Adjuster, M4 x 0.25, 20 mm Long
$8.00
Today
F4MSS25 Support Documentation
F4MSS25NEW!Fine Hex Adjuster, M4 x 0.25, 25 mm Long
$8.75
Today

M4 x 0.25 Fine Adjuster with Knob

  • 15 mm and 20 mm Long Adjusters Available
  • Max Load: 8.5 kg (18.74 lbs)
Our high precision M4 x 0.25 adjustment screws are a convenient drop-in alternative to our F4MSS series hex adjusters. The non-slip knurled knob improves adjustment sensitivity.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Metric Price Available
M4AS15 Support Documentation
M4AS15NEW!Fine Adjuster with Knob, M4 x 0.25, 15 mm Long
$19.50
Today
M4AS20 Support Documentation
M4AS20NEW!Fine Adjuster with Knob, M4 x 0.25, 20 mm Long
$20.50
Today

M4 x 0.25 Removable Adjuster Knob

  • Use with M4 x 0.25 Hex Adjusters
  • Clearance Hole Allows Access to Adjuster's Hex Socket
  • Available in 2 Sizes
  • Knurled Knob Increases Adjustment Sensitivity

The F4MSSK1 and F4MSSK1L Removable Adjustment Knobs thread onto our M4 x 0.25 F4MSS series hex adjusters to allow adjustment without the use of a hex key. This provides quick and easy adjustments for a broad range of applications. The adjuster knobs are available in two sizes: Ø14.7 mm and Ø7.1 mm.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Metric Price Available
F4MSSK1L Support Documentation
F4MSSK1LNEW!Large-Diameter M4 x 0.25 Removable Adjuster Knob
$8.50
Today
F4MSSK1 Support Documentation
F4MSSK1NEW!M4 x 0.25 Removable Adjuster Knob
$5.75
Today

M4 x 0.25 Threaded Bushing

  • Ideal for Slip Fit Applications
  • Material: 510 Phosphor Bronze
  • Vacuum Compatible: 10-6 Torr
  • Recommended Bore Diameter: 0.217" +0.001/-0.000"

Our M4 x 0.25 threaded bushings are commonly used in slip fit applications where fine adjusters are needed. Due to the tolerances of our fine adjusters, we discourage press fitting these bushings. The recommended bore diameter for our M4 x 0.25 bushings is 0.217" +0.001/-0.000". Please see the Integration tab for more information. For vacuum applications, we recommend a thorough ultrasonic cleaning to remove any grease or particulates prior to use.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Metric Price Available
F4MSSN1P Support Documentation
F4MSSN1PNEW!Threaded Bushing, Phosphor Bronze, M4 x 0.25, 5 mm Long
$8.00
Today
F4MSSN2P Support Documentation
F4MSSN2PNEW!Threaded Bushing, Phosphor Bronze, M4 x 0.25, 10 mm Long
$9.00
Today

M4 x 0.25 Adjuster Nut

  • Externally M6 x 0.5 Threaded
  • Material: 510 Phosphor Bronze
  • Vacuum Compatible: 10-6 Torr

Our N250L4P vacuum-compatible ultra-fine adjuster nut is internally M4 x 0.25 threaded and externally M6 x 0.5 threaded. These sleeves can be threaded into M6 x 0.5 tapped holes to provide M4 x 0.25 fine adjustment in a variety of applications where threaded bushings are not suitable. For vacuum applications, we recommend a thorough ultrasonic cleaning to remove any grease or particulates prior to use.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Metric Price Available
N250L4P Support Documentation
N250L4PNEW!Vacuum-Compatible Adjuster Nut, Internally M4 x 0.25 Threaded, Externally
M6 x 0.5 Threaded
$11.00
Today

M4 x 0.25 Lock Nut

  • Knurled Outside Diameter for Easy Tightening
  • Material: 510 Phosphor Bronze
  • Vacuum Compatible: 10-6 Torr

The LN4M29 lock nut features a knurled outside diameter to make gripping the nut easier when loosening or tightening. The lock nut is made from 510 Phosphor Bronze, which is vacuum rated for 10-6 Torr. Each nut features blind holes that allow a 2.0 mm (5/64") hex key to be used to help tighten the lock nut.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Metric Price Available
LN4M29 Support Documentation
LN4M29NEW!M4 x 0.25 Lock Nut
$9.00
5-8 Days
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