| IR 3942 Impact Wrench Parts List | |||
| Item | Part Number | Part Description | IR Equivalent |
| 1 | Inside Trigger Handle Assembly | 3940-A92 | |
| 2 | Grease Fitting | 130SR-188 | |
| 3 | Trigger | 3940-93 | |
| 4 | Trigger Pin | 280-265 | |
| 5 | Throttle Valve Plunger | 3940-302 | |
| 6 | 8598 | Throttle Valve Assembly | 2934-A50 |
| 7 | 8554 | Throttle Valve Seal | 2934-159 |
| 8 | 8555 | Throttle Valve Spring | 834-51 |
| 9 | 8556 | Air Strainer Screen | 434-61 |
| 10 | 8650 | Straight Inlet | 845-565 |
| 11 | 8557 | Reverse Valve Seal | R00BR-210 |
| 12 | Reverse Lever | 3940-75 | |
| 13 | Reverse Valve | 3934-329 | |
| 14 | 8283 | Reverse Valve Bushing Seal | 85H-167 |
| 15 | Handle Cap Screw (4) | 3940-638 | |
| 16 | 9564 | Motor Clamp Washer | 2934-207 |
| 17 | 8145 | Handle Gasket | 3940-283 |
| 18 | 8559 | Rear Rotor Bearing | 508-97 |
| 19 | Cylinder Dowel | 3934-98 | |
| 20 | 8175 | Rear End Plate | 2934-12 |
| 21 | 9707 | Cylinder | 2934-3 |
| 22 | Rotor | 3934-53 | |
| 23 | 2158 | Rotor Vane (7 required) | 2934-42-7 |
| 24 | Front End Plate | 3940-11 | |
| 25 | 8560 | Front Rotor Bearing | 810-97 |
| 26 | Motor Housing | 3934-40 | |
| 27 | Reverse Valve Bushing | 3940-330 | |
| 28 | Warning Label for Impactools | WARNING-2-99 | |
| 29 | 8350 | Air Port Gasket Retainer (2) | 2940-200 |
| 30 | 8579 | Air Port Gasket | R44H-210A |
| 31 | 8561 | Reverse Lock Plunger | 4U-663B |
| 32 | 8562 | Reverse Lock Plunger Spring | 4U-664 |
| 33 | Exhaust Deflector | 3934-123 | |
| 34 | 8736 | Exhaust Silencer | 3934P-311 |
| 35 | 8071 | Hammer Case Gasket | 3940-36 |
| 36 | 9052 | Hammer Frame Assembly | 2940-A703 |
| 37 | 8139A | Hammer Pin with Head (2) | 2940-704 |
| 37 | 8139B | Hammer Pin without Head (2) | |
| 38 | 8138 | Hammer (2) | 2940-724 |
| 39 | 9053 | Anvil, Standard Length (1"square drive) | 2940-726 |
| 39 | Anvil, 6" Extended Length (1"square drive) | 2940-314-6 | |
| 40 | Hammer Case Assembly | 3940-D727 | |
| 41 | 9338 | Hammer Case Bushing | 2934-641 |
| 42 | Hammer Case Cap Screw (4) | 3940-105 | |
| 43 | Dead Handle Bracket | 3940-364 | |
| 44 | 8754 | Dead Handle | 3940-48 |
| 45 | Socket Retainer | RR10015S | |
| 46 | Spline Drive Anvil Assembly | 2940-A526 | |
| 47 | 8143 | Socket Retaining Ball | D04-280 |
| 48 | 8142 | Plunger Retaining Pin | 845-128 |
| 49 | 8141 | Retaining Plunger Spring | 2940-231 |
| 50 | Retaining Ball Plunger | 845-230 | |
| 51 | Outside Trigger Handle Assembly | 3940-A1 | |
| 52 | Trigger | 844-78 | |
| 53 | Trigger Pin | 280-265 | |
| 54 | Throttle Valve Plunger (Includes illustrated parts 2, 5, 6, 7, 8, 9, 10 & 11) | 3940A-302 | |
| * | 9989 | Tune-up Kit (Includes illustrated parts 7, 8, 9, 11, 14, 17, 18, 23, 25, 29 [2], 30[2], 31, 32, 34, 35, 47, 48 & 49) | 3942-TK1 |
