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Set of 25 shims 0.05mm diameter 4mm - Retro Arms

5.50

Tax included

The Set of 25 Shims 0.05mm (4mm Shaft) by RetroArms is the secret weapon of the most demanding mechanical tuners. Designed exclusively for gears with an oversized 4mm shaft (such as PandoRA or NGRS systems), these ultra-thin shims of half a tenth of a millimeter (0.05 mm) allow you to eliminate even the most microscopic axial play without risking blocking the rotation. The result? Incredibly smooth mechanics, a very silent gearbox and a drastic increase in battery efficiency and the lifespan of internal components.

Size Guide

This is an approximate conversion table to help you find your size. If you have already purchased an item from our brand, we recommend you select the same size indicated on its label.

Men's Sizes

International	XS	S	M	L	XL	XXL	XXXL
Europe	32	34	36	38	40	42	44
US	0	2	4	6	8	10	12
Chest Circumference (inches)	33-35"	36-38"	39-41"	42-44"	45-47"	48-50"	51-53"
Chest Circumference (cm)	84-89	91-97	98-104	107-112	114-119	122-127	129-134
Waist Circumference (inches)	28"	30"	32"	34"	36"	38"	40"
Waist circumference (cm)	71	76	81	86	91.5	96.5	101.5

LOWA FOOTWEAR SIZE CHART

SIZE SELECTION:

THE SIZES IN THE DROP-DOWN MENU ARE UK SIZES (ENGLISH)

conversion chart: UK size - (IT size) - size in mm

Size 6.5 (40) 257mm

Size 7 (40 3/4) 262mm

Size 7.5 (41.5) 266mm

Size 8 (42) 270mm

Size 8.5 (42.5) 274mm

Size 9 (43 1/4) 278mm

Size 9.5 (44) 283mm

Size 10 (44.5) 287mm

Size 10.5 (45) 291mm

Size 11 (46) 295mm

Size 11.5 (46.5) 300mm

Size 12 (47) 304mm

Size 12.5 (48) 308mm

Size 13 (48.5) 312mm

NEED ADVICE ON CHOOSING A SIZE?

Take one of your sneakers and look at the size in mm or cm, look at the diagram above to see what it corresponds to and order your size!

e.g., your sneaker is 27.2 cm long? Great, the closest and most correct size will be: "TG 8.5 (42.5) 274mm", in the purchase menu select size 8.5UK!

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Description
Product Details

Master-Level Micro-Adjustments:
Shimming gears is not a simple assembly, it is a true art that distinguishes a professional technician from a hobbyist. Very often, adding a standard 0.1mm shim makes the gear too tight and causes friction, removing it makes it too "wobbly". RetroArms solves this eternal dilemma by offering you a package of 25 ultra-thin 0.05mm shims. With this extreme measurement, you can achieve absolutely perfect coupling, reducing friction almost to zero.

Specific for 4mm Shafts:
Unlike standard replicas that use 3mm shafts, some high-performance or new-generation mechanics (such as PandoRA gears from RetroArms itself or NGRS systems) adopt robust 4mm shafts to withstand higher mechanical stresses. These shims are calibrated to the hundredth of a millimeter to fit perfectly on these oversized pins, avoiding eccentricity or abnormal movements during the most intense bursts.

Main Advantages

Extreme Precision: The 0.05mm thickness allows for micro-adjustments impossible with classic sets on the market.
Silence and Smoothness: Eliminates axial play, drastically reducing drag noise and tooth wear.
Calibrated for 4mm: Specific internal diameter for reinforced gears like PandoRA or NGRS Tokyo Marui.
Electrical Efficiency: Less friction in the Gearbox means the motor strains less, saving battery!

Technical Specifications

Manufacturer: RetroArms
Shaft Compatibility: 4 mm (Only for gears with oversized shaft, e.g. PandoRA or NGRS)
Thickness: 0.05 mm
Material: High-strength steel
Total Quantity: 25 Shims

Package Contents

25x RetroArms 0.05 mm Shims (4mm Shaft)

Pro Tips

HOLD ON (Measure your gears!): Before putting this product in the cart, be 100% sure that you have mechanics with 4mm shafts. 90% of the AEGs on the market (the classic M4, AK, etc.) have gears with a 3mm shaft. If you put these 4mm shims on a 3mm shaft, they will "dance" off-center and will rub where they shouldn't, causing damage! Only take them if you have specific components (PandoRA, NGRS, etc.).

The superpower of 0.05mm: Anyone who fiddles with Gearboxes knows it. Close the gearbox shell, turn the gear with your finger... it turns freely but has a bit of axial play. Add a 0.1mm shim, close everything, and the gear is stuck. This is where 0.05mm saves your life and liver. Having the half measure available is literally the secret to silent and indestructible setups.

Don't trust the factory: Many new "out of the box" replicas, despite having expensive components, are poorly shimmed in the assembly line. Sometimes, disassembling a newly purchased replica and redoing the shimming using these micro-shims for a few euros is the smartest and most vital upgrade you can do to avoid shredding the gears after 3000 BBs.