Knipex 5" Precision Half-Round Nose Pliers, Smooth Jaws – 37 31 125
Work with small components confidently using these professional precision pliers featuring half-round jaws and smooth gripping surfaces. Designed for fine assembly work in electronics, precision mechanics, and detailed repair applications, these pliers provide controlled gripping, holding, bending, and adjustment capabilities in a compact 5-inch design.
The specialized half-round jaw profile makes these pliers a versatile choice for handling small parts and performing delicate bending operations. Their precision-ground tips allow accurate positioning, while the smooth gripping surfaces help reduce unwanted marks compared with conventional serrated jaws.
The jaws are carefully finished with deburred edges, making them particularly useful when handling components where sharp edges or aggressive gripping teeth could cause damage. Their compact shape allows precise control during assembly and maintenance work.
Manufactured from high-grade special tool steel, the pliers are forged and oil-hardened for durability. The black atramentized finish provides surface protection, while the polished head offers a clean, professional finish around the working jaws.
The lap joint construction supports accurate jaw alignment and controlled movement. Plastic-coated handles provide a comfortable gripping surface for detailed hand operations.
Measuring 125 mm long and weighing approximately 74 grams, these pliers are convenient for electronics repair benches, mechanical assembly stations, jewelry-making workstations, model-building projects, and precision tool kits.
Made in Germany, they combine professional construction with the specialized jaw geometry needed for detailed gripping and bending tasks.
Features & Benefits
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Half-Round Jaws: Specialized profile for gripping, positioning, and bending suitable small components.
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Smooth Gripping Surfaces: Help minimize unwanted marks compared with serrated jaws.
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Precision-Ground Tips: Provide accurate engagement during detailed assembly work.
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Carefully Deburred Edges: Help reduce unwanted scratching from unfinished jaw edges.
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125 mm Overall Length: Compact 5-inch size for precision handling.
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27 mm Jaw Length: Provides useful reach for small components.
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2 mm Tip Width: Narrow working tips for accurate positioning.
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1.6 mm Tip Thickness: Slim tip profile for fine mechanical work.
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Forged Tool Steel Construction: Manufactured from high-grade special tool steel.
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Oil-Hardened: Heat-treated for strength and durability.
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Lap Joint: Supports smooth jaw movement and accurate alignment.
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Polished Head: Clean finish around the working jaws.
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Black Atramentized Body: Protective finish on the plier body.
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Plastic-Coated Handles: Provide a comfortable gripping surface.
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Lightweight Design: Approximately 74 grams for convenient precision handling.
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DIN ISO 9655: Manufactured to the applicable precision pliers standard.
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Made in Germany: Professional Knipex manufacturing.
Specifications
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Brand: Knipex
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Manufacturer Part Number: 37 31 125
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Micro-Tools SKU: 37-31-125
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UPC: 843221012229
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EAN: 4003773035145
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Product Type: Precision Gripping Pliers
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Jaw Style: Half-Round
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Gripping Surfaces: Smooth
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Tip Finish: Precision-Ground
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Edge Finish: Carefully Deburred
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Overall Length: 125 mm (4.92")
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Overall Width: 50 mm (1.97")
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Overall Thickness: 11 mm (0.43")
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Jaw Length (B): 27 mm (1.06")
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Head Width (A): 12.5 mm (0.49")
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Jaw Thickness at Joint (D): 7 mm (0.28")
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Tip Width (E): 2 mm (0.08")
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Tip Thickness (F): 1.6 mm (0.06")
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Material: High-Grade Special Tool Steel
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Manufacturing Method: Forged
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Hardening: Oil-Hardened
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Body Finish: Black Atramentized
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Head Finish: Polished
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Handle Finish: Plastic-Coated
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Joint Type: Lap Joint
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Weight: 74 g (2.61 oz)
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Applicable Standard: DIN ISO 9655
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Country of Origin: Germany
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Package Quantity: 1 Pair of Pliers
Ideal For
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Electronics assembly and repair
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Precision mechanical work
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Gripping and positioning small components
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Holding miniature parts during assembly
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Controlled bending of suitable wire
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Small metal component adjustment
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Instrument maintenance
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Fine assembly operations
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Jewelry making and repair
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Model building
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Hobby electronics projects
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Small-scale metalworking
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Detailed equipment servicing
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Professional precision tool kits
Specialized Half-Round Jaw Design
The defining feature of these pliers is their half-round jaw geometry.
This design provides a different working profile from conventional flat nose or round nose pliers.
The half-round shape is useful for gripping and positioning small components while also supporting controlled bending operations.
The slim working tips allow accurate placement around compact assemblies.
This combination makes the pliers particularly practical for precision mechanics, electronics repair, and other detailed work.
When selecting pliers, consider the shape of the workpiece and the amount of gripping contact needed.
Smooth Gripping Surfaces
The jaws feature smooth gripping surfaces rather than aggressive serrations.
This helps reduce unwanted impressions when working with suitable delicate components.
Smooth jaws are especially useful when gripping small metal parts, finished components, and materials that could be damaged by conventional toothed pliers.
However, even smooth jaws can leave marks on soft metals or polished surfaces if excessive pressure is applied.
For particularly sensitive workpieces, protective jaw material may be appropriate.
Precision-Ground Tips
The working tips are precision-ground to support accurate handling.
With a specified tip width of 2 mm and thickness of 1.6 mm, the narrow ends are useful for positioning small components.
This is particularly valuable when working around nearby parts or in compact assemblies.
Carefully deburred edges help reduce the risk of unwanted scratches caused by sharp, unfinished surfaces.
The combination of slim tips and smooth jaws provides control for detailed mechanical work.
Forged, Oil-Hardened Tool Steel
The pliers are manufactured from high-grade special tool steel.
Forging provides the basic tool construction, while oil-hardening develops the strength and durability required for repeated gripping and bending operations.
The black atramentized body finish helps protect the metal surface during normal use.
The polished head provides a clean finish around the working area.
For long service life, avoid excessive force, twisting the jaws sideways, or using the tool as a lever.
Lap Joint Construction
The lap joint connects the two halves of the pliers and supports controlled jaw movement.
Accurate alignment is important when handling miniature components.
The joint design helps maintain consistent operation during gripping, positioning, and adjustment tasks.
Keep the joint clean and free from abrasive debris.
A small amount of suitable tool lubricant can be applied when needed to maintain smooth movement.
Compact 125 mm Design
At approximately 5 inches long, these pliers are convenient for detailed bench work.
The compact design provides maneuverability around small assemblies while remaining comfortable to hold.
The 27 mm jaw length offers useful reach for gripping and positioning components.
Weighing approximately 74 grams, the pliers are lightweight and practical for repetitive precision handling.
Their size also makes them a convenient addition to repair kits, tool rolls, and workbench organizers.
Comfortable Plastic-Coated Handles
The handles feature a plastic coating that provides a more comfortable gripping surface than bare metal.
This supports controlled hand movements during detailed assembly and adjustment operations.
The slim handle design is suitable for precision work.
The plastic coating is intended for grip comfort and is not a certified electrical insulation system.
Do not use these pliers on energized electrical equipment.
Electronics and Precision Mechanics
These pliers are designed for fine assembly work in electronics and precision mechanical applications.
They are useful for gripping, holding, bending, and adjusting small components.
The slim half-round jaws allow controlled handling during detailed assembly tasks.
Their smooth gripping surfaces are beneficial when aggressive serrations could damage suitable parts.
When working with static-sensitive electronic components, follow appropriate ESD-control procedures.
These pliers are not specifically identified as ESD-safe.
Jewelry Making and Small Metalworking
The half-round jaw profile is also useful for appropriate jewelry-making and small metalworking applications.
The jaws can help grip small findings, position metal components, and perform controlled bending operations.
Their smooth gripping surfaces are practical when minimizing unwanted marks is important.
For soft or highly polished jewelry components, protective jaw coverings may be appropriate.
These are gripping and bending pliers, not cutting pliers.
Proper Use and Care
Select the correct pliers for the size and shape of the component.
Position the workpiece securely between the jaws.
Apply controlled pressure without overtightening.
Avoid twisting the narrow tips sideways or using them as levers.
Do not use the pliers for cutting wire or other materials.
Keep the smooth gripping surfaces clean and free from abrasive particles.
Inspect the tips regularly for damage or misalignment.
Wipe the tool clean after use and store it in a dry location.
Apply a small amount of suitable lubricant to the joint when necessary.
Do not use the pliers on energized electrical equipment.
Frequently Asked Questions
What are Knipex 37 31 125 pliers used for?
They are designed for gripping, holding, bending, and adjusting small components in electronics, precision mechanics, and other fine assembly applications.
What type of jaws do they have?
They feature half-round jaws.
Are the gripping surfaces smooth?
Yes. The jaws have smooth gripping surfaces.
Are the jaws serrated?
No. They do not have aggressive serrated gripping teeth.
What is the benefit of half-round jaws?
The half-round profile provides a versatile shape for gripping, positioning, and bending suitable small components.
How long are the pliers?
They measure 125 mm, approximately 4.92 inches.
What is the jaw length?
The jaw length is 27 mm.
What is the head width?
The head width is 12.5 mm.
What is the tip width?
The tip width is 2 mm.
What is the tip thickness?
The tip thickness is 1.6 mm.
How thick are the jaws at the joint?
The jaw thickness at the joint is 7 mm.
What material are the pliers made from?
They are manufactured from high-grade special tool steel.
Are they forged?
Yes. The pliers are forged.
Are they hardened?
Yes. They are oil-hardened.
What finish do they have?
The body has a black atramentized finish, while the head is polished.
What type of joint do they use?
They feature a lap joint.
What type of handles do they have?
The handles are plastic-coated.
Are the handles electrically insulated?
They are plastic-coated but are not rated for work on energized electrical equipment.
Can they be used for electronics repair?
Yes. They are designed for fine assembly work in electronics and precision mechanics.
Are they ESD-safe?
No ESD-safe classification is specified.
Can they be used for jewelry making?
Yes. Their half-round, smooth jaws are useful for suitable jewelry-making applications.
Can they bend wire?
Yes. They can bend suitable small wire and metal components.
Can they cut wire?
No. These pliers do not have cutting edges.
Will the jaws scratch polished metal?
The smooth surfaces help reduce marking, but excessive pressure or debris on the jaws can still damage delicate finishes.
How are these different from Knipex 37 11 125?
Model 37 11 125 has flat, wide jaws, while model 37 31 125 has half-round jaws.
How are these different from Knipex 37 21 125?
Model 37 21 125 has flat, concave, pointed jaws, while model 37 31 125 has half-round jaws.
Are these suitable for precision assembly?
Yes. Fine assembly work is one of their primary intended applications.
How much do they weigh?
Approximately 74 grams, or 2.61 ounces.
What standard do they meet?
The manufacturer specifies DIN ISO 9655.
Can they be used for repetitive assembly tasks?
Yes. Their compact, lightweight construction is suitable for repeated precision gripping and adjustment operations.
How should the pliers be maintained?
Keep the jaws clean, inspect the joint and tips regularly, and store the tool in a dry location.
Where are they manufactured?
They are made in Germany.
How many pliers are included?
One pair of pliers is included.
| SKU: | 37-31-125 |
| UPC: | 843221012229 |
| BRAND: | Knipex |
| MPN: | 37 31 125 |
| Made In: | Germany |
