Draft:UTON vz. 75
czechoslovakia most famous military knife
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The UTON vz. 75 (Útočný nůž vzor 75, meaning "assault knife model 75") is a Czechoslovak military fighting knife adopted by the Czechoslovak People's Army (ČSLA) in 1976. Intended primarily for reconnaissance, airborne and aviation units, it saw service for over four decades and remains in limited use with the Army of the Czech Republic.
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| UTON vz. 75 | |
|---|---|
| Type | Fighting knife |
| Place of origin |  Czechoslovakia |
| Service history | |
| In service | 1976–present (limited) |
| Used by | Czechoslovak People's Army Army of the Czech Republic |
| Production history | |
| Designer | Research Institute 010 Slavičín, Mikov |
| Designed | 1973 |
| Manufacturer | Mikov |
| Produced | 1976–1985 |
| No. built | approx. 50,000 |
| Variants | 0001, 0002, 0003, 0004, 0005, 0006, 0007 |
| Specifications | |
| Mass | 200 g (7.1 oz) |
| Length | 248 mm (9.8 in) |
Background and development
By the early 1970s the existing VO-7 airborne knife was considered obsolete, and the Czechoslovak military tasked Research Institute 010 in Slavičín — working alongside the knife manufacturer Mikov of Mikulášovice — with developing a successor. The development project carried the codename UTON, an acronym of Útočný nůž ("assault knife").
Trials concluded successfully in 1973. The formal technical specification, TP-VD-648-76, governing production and acceptance of the assault knife vz. 75 was signed off on 15 December 1976.[1]
Mikov produced the knives in batches and they were issued to reconnaissance, airborne and aviation personnel, who stowed them on the reserve parachute harness — useful for cutting away a malfunctioning chute. Knives were packaged ten to a cardboard box together with a whetstone, and army stocks were preserved by coating with grease type P.
From 1985 the Bonus vz. 85 began replacing the UTON in frontline service. The older knife was never formally withdrawn, however, and some Czech Army units still carry it today alongside unit-specific commemorative versions and the bayonet of the CZ BREN rifle, which doubles as a field knife.
Description
Blade
The blade is single-edged with a clip point and a false edge ground along the upper spine. Material is stainless steel grade 17029, hardened and then subjected to deep cryogenic treatment (the proprietary MARTFROST process) to achieve a surface hardness of 50–58 HRC. A fine grind finish — surface roughness 0.2–0.8 Ra — was specified to minimise light reflection in the field.[2]
Handle and sheath
The rubber handle (compound 137.21, moulded by Gumokovo of Hradec Králové) is pressed directly onto the tang. Before moulding, two small steel plates are riveted to the tang to support the rear portion where the accessories seat. The sides carry a cross-hatched texture, and the pommel end has a 6 mm hole for a brass retaining pin.
The sheath is made from five layers of natural cowhide stitched and fixed with brass rivets. A front panel carries separate pouches for the file and saw; a rear pouch holds the safety cord. Two internal spring plates grip the blade to prevent the knife shaking loose.
Accessories
Three items store in the handle slot:
- A file of steel grade 14180 (hardness 56–60 HRC), 130 mm long
- A saw of the same steel (hardness 45–54 HRC), tipped with a flat screwdriver
- A 2 m nylon safety cord, 2.5 mm in diameter
Production series
A four-digit code stamped on the blade identified the manufacturing batch and the particular production process used for the blade:
| Series | Blade manufacture | Quantity produced |
|---|---|---|
| 0001 | Hot-forged; did not fully comply with the technical specification | approx. 500 |
| 0002 | Cut from solid bar, ground after hardening, cold-straightened | 1,680 |
| 0003 | Cut from solid bar, air-cooled in a straightening fixture after hardening | 4,500 |
| 0004–0007 | Forged blanks — the definitive production method | majority of output |
On series 0001–0004 the stamp appears on the right face of the blade near the guard; on 0004–0007 it moved to the right face near the spine. Military blades are always stamped on the right side; civilian variants on the left.[3]
Acceptance trials
Before entering service the knife was put through a formal test programme at the VZS 080 laboratory; the surviving record is protocol no. 1286/76. Among the tests:
- A rubber handle pulled on the ZWICK tensile tester held firm at 2,000 N (roughly 200 kg) with no separation.
- The blade was required to survive deflection to 5° in both directions without taking a permanent set.
- Edge endurance was assessed by 500 cuts into hardwood followed by a sharpness check.
- Sharpness was verified by severing a 2 m parachute cord loaded with a 2 kg weight in a single draw cut.
- Corrosion resistance was checked by exposure to sulphuric acid vapour.
One notable finding was that blade fractures in the bend tests occurred consistently at the stamped number — the stamping had introduced a stress concentration. The protocol recommended moving the marking to the centre of the blade and orienting it lengthwise to reduce this notch effect.[2]
Specifications
| Overall length | 248 mm (9.8 in) |
| Blade length | 140 mm (5.5 in) |
| Blade width | 25 mm (1.0 in) |
| Blade thickness | 3.7 mm |
| Steel | 17029 stainless |
| Blade hardness | 50–58 HRC |
| Knife weight | 200 g (7.1 oz) |
| Weight with sheath | 380 g (13.4 oz) |
| Safety cord | 2,000 mm |
| File length | 130 mm |
Commemorative and civilian versions
Mikov produced a range of non-standard versions over the years. Gift knives were made for the 601st Special Forces Group, URNA (the Czech police counter-terrorism unit), and the SFOR peacekeeping mission, as well as various airborne-unit anniversary editions. The commercial civilian version is identifiable by the series number on the left blade face and a matte-textured handle rather than the polished military finish.
Operators
Czechoslovakia — Czechoslovak People's Army (1976–1993)- Czech Republic — Army of the Czech Republic (1993–present, limited service)
Slovakia — Armed Forces of the Slovak Republic (1993–present, limited service)
See also
- Bonus vz. 85
- VO-7
- Mikov
- Czechoslovak People's Army