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All Categories > Imperial (US) Fine Adjustment Screws and Bushings > Imperial (US) Screw & Bushing Matched Sets > 1/4-508 TPI Sets > Item # TSB250-508-375/312-AA  
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Item # TSB250-508-375/312-AA, 1/4-508 TPI Sets

List Price $28.54 ( Quantity Discount Available )

Our imperial sized matched set micro positioning adjustment screws and unbraked bushings deliver precision smooth movements in the most demanding OEM applications. These matched sets provide the smoothest and most precise movements in the industry.

Our highly developed proprietary machining and custom modified machines enable us to produce our 508 TPI (0.05 mm pitch) adjusters to standards that exceed industry standards. Thread class exceeding 3a-3b by 45%.

Note: Kozak Micro cannot guarantee that our screws and bushings will be compatible with screws and bushings sold by other manufacturers.

Note: If you would like the bushing to be oriented in the opposite direction, please write "flip bushing" at step 4 in the comments section when checking out.


Thread Diameter

1/4 in

Thread Pitch

508 TPI

Thread Class

Exceeding 3A-3B by 45%

Screw Length Decimal

0.375 in

Ball Tip Diameter

0.187 in

Bushing Length

0.312 in

Barrel OD

0.3125 in

Flange OD

0.352 in

Flange Thickness

0.01 in

Bushing Material

360 Brass H02

Brass ASTM #


Hex Drive

5/64 in

Screw Material

303 S.S.

Screw ASTM #

AISI 303 (ASTM-A-484-00)

Ball Material

AISI 52100

Ball Hardness

53 HRC

Shipping Weight (lb/set)

0.0093 lb

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TSB250-508-375_312-AA 3D Models

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