Description
Most heavy equipment workshops already own a deep set of 1 in impact sockets. Moving to a 1-1/2 in tool often means a second socket set and new adaptors. The Snap-on PTM1990 pneumatic torque wrench avoids that step for many jobs. It keeps the 1 in square drive, yet Snap-on rates it up to 1,990 ft-lb, or 2,700 N·m.
Snap-on PTM1990 pneumatic torque wrench specifications
- Square drive: 1 in.
- Torque range: 400-1,990 ft-lb (540-2,700 N·m).
- Accuracy: ±5%, per the Snap-on Industrial catalog.
- Twin motor design for fast rundown, then a smooth final torque.
- Noise below 85 dB under load, with low vibration.
- In the case: cranked reaction fixture, tool hanger, secondary handle and male quick connect.
Snap-on also ships each PTM tool with a Certificate of Calibration and a torque vs. pressure chart.
Workshop jobs in the 540-2,700 N·m band
For instance, the PTM1990 fits these tasks well:
- Final drive and sprocket bolts on excavators and dozers.
- Engine and transmission mounts on mining trucks.
- Die clamp and frame bolts on large presses.
- Steel connections during plant expansions.
However, if your values sit mostly below 540 N·m, a smaller PTM gives finer control at the low end.
Getting at hidden and recessed bolts
Snap-on offers bladed multiplier extensions for the PTM series. The 1 in drive versions come in 6, 9 and 12 in lengths. Their thin reaction blade fits into gaps with very little clearance, and a retention clip makes fitting quick. In addition, the catalog groups the PTM1990 with the PTM2950 for reaction fixtures. So sliding reactions, weld rings and cranked arms carry over if you later add the bigger tool.
Pressure sets the torque
Think of the regulator gauge as the PTM1990 torque dial. Snap-on requires its PTMFRL filter/regulator unit on PTM tools, since it cleans and oils the air. To set a value, read the matching pressure from the chart, then adjust the gauge. After that, test one joint before you start the full pattern. Also keep hoses short, because a long or narrow line starves the motor.
What the PTM1990 should never do
Do not use it to crack loose rusted or seized nuts. Instead, free them with a breaker tool first, then torque with the PTM1990.
Ordering from Lost in HCM
SMK Vietnam lists the PTM1990 for our partner Lost in HCM, who supplies it and quotes the price. Send your torque list and air supply details when you request a quote from Lost in HCM. Meanwhile, you can compare other torque multipliers or contact SMK Vietnam with questions.
Snap-on PTM1990 pneumatic torque wrench: common questions
Will my 1 in impact sockets fit the PTM1990?
Yes, as long as they have a 1 in square drive and suit the torque. Use impact-grade sockets in good condition.
Is the PTM1990 the only 1 in drive PTM above 2,000 N·m?
No. Snap-on also lists the PTM2950SA, a 1 in drive model rated 800-4,000 N·m.
Does the PTM1990 ship with a calibration certificate?
Snap-on states that PTM tools ship with a Certificate of Calibration and a torque vs. pressure chart. Confirm this with Lost in HCM.
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