Howmet Aerospace Marson BT-8

Questions and Answers

A
Annette VargasAug 12, 2025
What to do if Howmet Aerospace Marson BT-8 blind rivet nut does not screw on?
- S
  Susan GreenAug 12, 2025
  If the blind rivet nut doesn't screw on, there could be several reasons. First, the nut thread might be defective, in which case you should use a new nut. Second, the threaded mandrel A could be defective, so you should change it. Third, the nut might not rest against the nosepiece because the threaded mandrel length x is incorrect; adapt it to the nut length. Also, ensure that while screwing on, you hold the nut until the tool stops and keep switch K pressed until the tool stops. If the battery has been idle for over 21 days, place it in the charger for 2 minutes. Finally, the battery might be discharged, so charge it or replace it if necessary.
D
Derrick RichardsonAug 20, 2025
Why Howmet Aerospace Marson BT-8 threaded mandrel does not unscrew?
- V
  Vicki ArcherAug 20, 2025
  If the threaded mandrel does not unscrew, it could be due to a couple of reasons. The setting stroke might be adjusted incorrectly; decrease the setting stroke. Alternatively, the battery could be discharged; in this case, charge the battery, and replace it if necessary.
K
Kenneth BerryAug 27, 2025
What to do if Howmet Aerospace Rivet Tools set blind rivet nut is loose?
- J
  johnsonluisAug 27, 2025
  If the set blind rivet nut is loose, it could be because the setting stroke is too short; increase the setting stroke. Also, keep switch K pressed until automatic changeover and unscrewing are finished.
V
Vincent HillSep 3, 2025
Why does the red lamp indicate a fault on Howmet Aerospace Rivet Tools?
- G
  garyflynnSep 3, 2025
  The red lamp indicates a fault because the blind rivet nut setting tool is not in the front end position. To resolve this, release the trigger button.

Overview

Technical Specifications
Usage Features
Changing Thread Sizes (Refer to Fig. 3)
Loading Rivet-Nut On Tool
Stroke Adjustment
Setting Rivet-Nut into Application
Safety Information
Battery Charging Procedure
Battery Care
Environmental Protection
Troubleshooting
Blind rivet nut does not screw on
Set blind rivet nut is loose
Threaded mandrel does not unscrew
Red lamp indicates fault (when pressing the trigger button)

The Marson BT-8 (M38997) is a battery-operated rivet-nut setting tool designed for high-volume assembly applications, providing reliable pull-force for efficient installation. This portable powerhouse offers exceptional value, including a battery and charger, all housed in a convenient carry case. The kit also includes front-end assemblies for installing both Metric thread sizes (M4-M12) and inch sizes (1/4-20", 5/16-18", and 3/8-16") coarse thread rivet nuts.

Technical Specifications:

Stroke Length: 0.236 inches
Pull Force: 3,579 lbf
Weight (with Li-ion battery pack): 5 lbs.
Battery Pack: 18 V / Li-ion / 2 Ah Rechargeable
Charge Time: Approximately 45 minutes
Rated Voltage: 18.0 V
Number of Cells: 5
Type of Cells: Li-ion
Capacity: 2.0 Ah
Battery Weight: 0.4 kg

Usage Features:

Changing Thread Sizes (Refer to Fig. 3):

The BT-8 is shipped and set up for use with 6MM Rivet Nuts. To change the thread size, you will need to replace Part A (Mandrel) and Part B (Nosepiece Cone) with the correct size for your rivet nut.

Using wrenches on Part B and Part C (Lock Nut), loosen Part B while holding Part C in place.
Once loose, manually screw off Part B.
To remove Part A, hold and pull back Part M (Slide) with your fingers. While holding Part M in place, unscrew Part A and remove the mandrel from the tool.
To assemble the new thread size Mandrel, pull back Part M and hold it in place. Screw on Part A (Mandrel) into the tool, ensuring it is hand tight only. Release Part M and push it forward by hand towards the front of the tool. Part M will partially cover the hex nut head of the Mandrel, locking it in place.
Next, screw Part B fully on (by hand) and then tighten it using wrenches, pressing Part C against Part B.

Loading Rivet-Nut On Tool:

Before loading, check the material thickness and hole size of the application, as rivet nuts have specific hole size and grip range specifications for proper setting.

Select your rivet nut and hold it with the flange side facing the tool.
While holding the rivet nut tight to prevent spinning, slightly rest it against and hold it level against Part A (Mandrel).
Press Trigger Part K and hold it until the tool stops, then release the trigger. Do not press the trigger a second time.
If the flange of the rivet nut is not against Part B, manually turn the rivet nut until it is against Part B.
Part A mandrel thread should be fully engaged with the rivet nut threads. If not fully engaged, proceed to stroke adjustment.

Stroke Adjustment:

Using wrenches, loosen Part D (Setting Nut) and Part E (Lock Nut) from each other. Continue turning Part E away from Part D to allow adjustment of Part D. Once Part D is adjusted, lock it down using Part E.
Turn Part D towards the tool (tighten) to increase the stroke, and loosen Part D to decrease the stroke.
This procedure should be adjusted to ensure the rivet nut pulls up tight and correctly forms the blind side bulge (see Fig. 4). Each full turn of Part D equals approximately 0.040 inches in stroke. It is recommended to test your adjustments in a test plate with the same hole size and material thickness before production. Remember that rivet nuts have specific specifications for hole size and grip range (material thickness) for the application they are being set in.

Setting Rivet-Nut into Application:

Hold the tool parallel to the application, insert the rivet nut into the hole, and pull Trigger K. Hold it until the tool reverses itself out from the set rivet nut.

Safety Information:

Always wear safety glasses when operating and performing maintenance on the tool.
Never overload the tool; work within its specified working capacity.
Do not use the tool in humid or wet environments or near flammable liquids or gases (Danger of Explosion!).
Ensure the battery is properly secured.
Always remove the battery when the tool is not in use or during maintenance.
Never use the tool as a hammer.
Store the tool in a dry and safe location when not in use.
The air inlets for the motor must not be obstructed; do not insert objects into them.
Use only genuine spare parts for repair.
Repairs must be carried out by skilled personnel only. In case of doubt, send the tool to a Marson authorized repair location.

Battery Charging Procedure:

Only charge batteries at temperatures between 0°C and 40°C.
Take the quick charger out of its packaging and connect it to the power supply, observing the voltage specified on the rating plate.
Insert the battery into the charger in the correct position (+pole to +pole) using minimum force.
The charging operation starts automatically.
Function Indicators:
- Steady green: Battery charged / trickle charging
- Flashing green: Charging
- Steady red: Impermissible charging temperature
- Flashing red: Battery defective
Charging Times:
- 2.0 Ah (Part No. 1 5000 020): approx. ≤90 min (1.5A), approx. ≤60 min (2.4A)
- 4.0 Ah (Part No. 1 5000 040): approx. ≤120 min (2.4A)
- Charging times may vary depending on residual capacity and battery temperature.

Battery Care:

Allow the battery to cool down before inserting it into the charger for optimum charge.
The battery can be recharged approximately 1000 times and reaches full capacity after several charges.
Do not insert the battery into the charger after each use.
Only charge the battery when it is discharged and blind rivet nuts can no longer be set. Recharge only after a prolonged idle period.
Significantly shorter battery operating times, despite proper recharging, indicate the battery needs replacement.
Store batteries in a dry place, free from frost. The optimum operating temperature range is 10 °C to max. 50 °C.

Environmental Protection:

Return used rechargeable batteries to your dealer or for recycling.
Never discard used batteries into household waste, fire, or water.
In all EU countries, relevant national regulations for implementing the EU guideline shall apply.
In Germany, this tool is registered under WEEE Reg.-No. DE 45695505. If the tool has an 8-digit serial number, it can be returned free of charge for correct disposal.

Troubleshooting:

Blind rivet nut does not screw on:

Cause: Nut thread defective. Corrective measure: Use new nut.
Cause: Threaded mandrel A defective. Corrective measure: Change threaded mandrel A.
Cause: Nut does not rest against nosepiece. Corrective measure: Threaded mandrel length incorrect; adapt to nut length.
Cause: Nut unscrews again. Corrective measure: While it is screwed on, hold the nut until the tool stops.
Cause: Battery switched off because it has been idle for longer than 21 days. Corrective measure: Keep switch K pressed until the tool stops. Place battery in the charger for 2 minutes.
Cause: Battery discharged. Corrective measure: Charge battery, replace if necessary.

Set blind rivet nut is loose:

Cause: Setting stroke too short. Corrective measure: Increase setting stroke.
Cause: Switch K released too early. Corrective measure: Keep switch K pressed until automatic changeover and unscrewing are finished.

Threaded mandrel does not unscrew:

Cause: Setting stroke adjusted incorrectly. Corrective measure: Decrease setting stroke.
Cause: Battery discharged. Corrective measure: Charge battery; replace if necessary.

Red lamp indicates fault (when pressing the trigger button):

Cause: Blind rivet nut setting tool not in front end position. Corrective measure: Release trigger button.

If faults occur that are indicated by the red lamp and cannot be rectified as described above, have the blind rivet nut setting tool repaired by a skilled technician or send it to an authorized Marson repair center.